Dual-amplified lumen raman laser

Abstract

The application relates to a double-amplification intracavity Raman laser, and relates to a solid laser amplifier. The application aims to solve the problems of complex structure and low energy utilization rate of a Raman laser amplifier, which is caused by the fact that most of the existing Raman laser amplifiers are coaxial amplifiers in stages, need a certain space for focusing, and need multiple Raman crystals to realize. The double-amplification intracavity Raman laser comprises the following: a double-light-amplification reflecting mirror one, a double-light-amplification reflecting mirror two, a seed-light-amplification reflecting mirror one, a fundamental-light-amplification reflecting mirror two, a fundamental-light-crystal module one, a fundamental-light-crystal module two, a Raman-crystal module, an LD pumping source one, an LD pumping source two, a fundamental-light-coupling lens group, a fundamental-light module, a seed-light-coupling lens group and a seed-light module; the Raman-crystal module is vertically arranged with the fundamental-light-crystal module one and the fundamental-light-crystal module two arranged above and below respectively. The application belongs to the technical field of lasers.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of laser technology, and relates to a solid laser amplifier, in particular to a Raman laser amplifier. BACKGROUND

[0002] Since the birth of laser, the application field of laser is more and more wide, and with the development of each field, there is a higher demand for the output power of laser. Due to the serious thermal effect of laser crystal under high-power pumping laser, even exceeding the damage threshold of laser crystal, the device is damaged, and the power output of a single laser reaches saturation. These factors limit the output power of laser, so in order to further improve the output power of laser, the laser amplifier technology is used.

[0003] The basic physical process of laser amplifier is the same as that of laser. Through the laser amplifier, higher laser output can be achieved, and it has become a common technical means for high-power laser output.

[0004] At present, most of the laser amplifiers are through the seed light passing through the laser crystal to convert the pumping laser into the seed light, and improve the laser output power of the seed light. The multi-stage amplification has been developed, and the seed light passes through multiple laser crystals for multiple gain amplification processes. After passing through each laser crystal, the output laser power can be amplified, and the structure is flexible, but the volume is large, and the single amplification efficiency is limited. Therefore, the laser polarization characteristics are used for design, so that the seed light can pass through the laser crystal multiple times, which further improves the conversion efficiency, but increases the complexity of the structure.

[0005] The Raman amplifier based on Raman effect is that the fundamental frequency light photons are incident into the Raman crystal, and the inelastic collision occurs between the photons and the phonons in the crystal, so that the fundamental frequency light with frequency of ν l excites a large number of molecules to the “virtual” state energy level u, forms the particle inversion number, and then the laser effect occurs, and the first-order Stokes light with frequency of ν s1 is radiated. The higher-order Stokes light can be generated by repeating the above process with the first-order Stokes light as the fundamental frequency light; and the difference between ν l and ν s1 is called Raman shift. SUMMARY

[0006] The purpose of the present application is to solve the problem that most of the existing Raman laser amplifiers are coaxial amplification one by one, need a certain space for focusing, and need multiple Raman crystals to realize, which leads to the problem of complex structure of Raman laser amplifier and low energy utilization rate, and a double-amplification internal cavity Raman laser is proposed.

[0007] A double-amplification intracavity Raman laser comprises: a double optical amplification mirror one, a double optical amplification mirror two, a seed light amplification mirror one, a fundamental light amplification mirror two, a fundamental light crystal module one, a fundamental light crystal module two, a Raman crystal module, an LD pump source one, an LD pump source two, a fundamental light coupling lens group, a fundamental light module, a seed light coupling lens group and a seed light module;

[0008] Coordinate axes are set, wherein the x-axis direction is a horizontal direction, the z-axis direction is a vertical direction, and the y-axis direction is determined according to the right-hand rule;

[0009] The fundamental light crystal module one and the fundamental light crystal module two are respectively arranged above and below in the vertical direction of the Raman crystal module;

[0010] The fundamental light crystal module one, the Raman light crystal module and the fundamental light crystal module two are closely arranged to form a sandwich structure;

[0011] The LD pump source one and the LD pump source two are respectively arranged in the horizontal direction of the fundamental light crystal module one and the fundamental light crystal module two, the pump light emitted by the LD pump source one is incident to the fundamental light crystal module one along the x-axis horizontal direction, and the pump light emitted by the LD pump source two is incident to the fundamental light crystal module two along the x-axis horizontal direction;

[0012] In the vertical direction of the sandwich structure, the double optical amplification mirror one is arranged above the fundamental light crystal module one, and the double optical amplification mirror two is arranged below the fundamental light crystal module two;

[0013] The seed light amplification mirror one is arranged on the left side of the double optical amplification mirror one, and the seed light amplification mirror one and the double optical amplification mirror one form an angle α2;

[0014] The fundamental light amplification mirror two is arranged on the right side of the double optical amplification mirror two, and the fundamental light amplification mirror two and the double optical amplification mirror two form an angle according to a geometric relationship α1 is an angle between the fundamental light horizontal incidence reflected by the fundamental light amplification mirror two and the vertical direction z-axis;

[0015] The seed light module comprises a seed light coupling lens group and a seed light source, and the seed light module is arranged on the lower side of the double optical amplification mirror two;

[0016] The fundamental light module comprises a fundamental light coupling lens group and a fundamental light one, and the fundamental light module is arranged on one side of the fundamental light amplification mirror two.

[0017] The beneficial effects of the present application are:

[0018] The application provides a double-amplification intracavity Raman laser, which coincides resonant cavities of seed light and fundamental light, and makes the seed light oscillate in the cavity for multiple times based on a traveling wave laser amplification technology, so that a coincident volume of the seed light and the fundamental light is increased, energy utilization is improved, and output power of the laser is greatly improved.

[0019] The application combines a seed light amplification process with a fundamental light amplification process, simplifies a cavity type structure of a laser amplifier, and further miniaturizes the amplifier.

[0020] The application places a fundamental light crystal and a seed light crystal in a resonant cavity, reduces loss caused by a complex cavity type structure, increases a power density of the fundamental light, improves conversion efficiency of the seed light, has high energy utilization, and has large output power. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole top view structural diagram of the embodiment one of the application;

[0022] Figure 2 It is a whole 3D schematic structural diagram of the embodiment one of the application;

[0023] In the figure, 1 is a double-light amplification mirror one, 2 is a double-light amplification mirror two, 3 is a seed light amplification mirror one, 4 is a fundamental light amplification mirror two, 5 is a fundamental light crystal module one, 6 is a fundamental light crystal module two, 7 is a Raman crystal module, 8 is an LD pump source one, 9 is an LD pump source two, 10 is a fundamental light coupling lens group, 11 is a fundamental light module, 12 is a seed light coupling lens group, and 13 is a seed light module.

[0024] Figure 3 It is a working principle diagram of the application;

[0025] Figure 4 It is a formula simulation example diagram. DETAILED DESCRIPTION

[0026] Specific implementation one: the double-amplification intracavity Raman laser in the embodiment includes the double-light amplification mirror one 1, the double-light amplification mirror two 2, the seed light amplification mirror one 3, the fundamental light amplification mirror two 4, the fundamental light crystal module one 5, the fundamental light crystal module two 6, the Raman crystal module 7, the LD pump source one 8, the LD pump source two 9, the fundamental light coupling lens group 10, the fundamental light module 11, the seed light coupling lens group 12, and the seed light module 13.

[0027] Double amplification refers to that the double-light amplification mirror one 1 and the double-light amplification mirror two 2 can amplify light of two wavelengths of the fundamental light and the seed light.

[0028] For the convenience of description, coordinate axes are set as shown in Figure 1 , wherein the x-axis direction is the horizontal direction, the z-axis direction is the vertical direction, and the y-axis direction is determined according to the right-hand rule;

[0029] The Raman crystal module 7 is placed vertically above and below the fundamental light crystal module one 5 and the fundamental light crystal module two 6 respectively;

[0030] The fundamental light crystal module one 5, the Raman light crystal module 7, and the fundamental light crystal module two 6 are placed closely to form a “sandwich” structure;

[0031] The LD pump source one 8 and the LD pump source two 9 are placed horizontally on the fundamental light crystal module one 5 and the fundamental light crystal module two 6 respectively, the LD pump source one 8 excites pump light to be incident horizontally along the x-axis to the fundamental light crystal module one 5, and the LD pump source two 9 excites pump light to be incident horizontally along the x-axis to the fundamental light crystal module two 6;

[0032] The double light amplification mirror one 1 is placed on the fundamental light crystal module one 5 vertically in the “sandwich” structure, and the double light amplification mirror two 2 is placed below the fundamental light crystal module two 6 vertically in the “sandwich” structure;

[0033] The seed light amplification mirror one 3 is placed to the left of the double light amplification mirror one 1, and the angle between the seed light amplification mirror one 3 and the double light amplification mirror one 1 is α2 (the angle between the extension line of the seed light amplification mirror one 3 and the extension line of the double light amplification mirror one 1 at the x-axis (acute angle));

[0034] The fundamental light amplification mirror two 4 is placed to the right of the double light amplification mirror two 2, and the angle between the fundamental light amplification mirror two 4 and the double light amplification mirror two 2 is α1 is the angle between the horizontal incident fundamental light and the vertical z-axis after the horizontal incident fundamental light is reflected by the fundamental light amplification mirror two 4;

[0035] The seed light module 13 includes a seed light coupling lens group 12 and a seed light source, and the seed light module 13 is placed below the double light amplification mirror two 2;

[0036] The fundamental light module 11 includes a fundamental light coupling lens group 10 and a fundamental light one, and the fundamental light module 11 is placed on one side of the fundamental light amplification mirror two 4.

[0037] Specific implementation method two: the difference between the specific implementation method two and the specific implementation method one is that the seed light module 13 excites seed light, the seed light is vertically incident through the seed light coupling lens group 12, is reflected by the seed light amplification mirror one 3, and then performs periodic reflection movement between the double light amplification mirror one 1 and the double light amplification mirror two 2, and the horizontal displacement of the seed light after each reflection is:

[0038] l2 = L2*tan2a2 (1)

[0039] The final reflection number j2 approximately satisfies the formula (out of the cavity after passing through the Raman crystal module (7)):

[0040]

[0041] In the formula, d2 is the lens length of the first double optical amplification mirror 1 and the second double optical amplification mirror 2, L2 is the distance between the first double optical amplification mirror 1 and the second double optical amplification mirror 2, l2 is the horizontal displacement of the seed light in each reflection, * is a multiplication sign, and a2 is the included angle between the seed light amplification mirror 1 and the first double optical amplification mirror 1.

[0042] Since it needs to conform to the actual meaning:

[0043] If j2 obtained is an integer, directly determine the parity;

[0044] If j2 obtained has a decimal, do not discard the next one, and then determine the parity of j2;

[0045] If j2 is even, the direction of the seed light emission is opposite to the direction of the seed light incidence;

[0046] If j2 is odd, the direction of the seed light emission is the same as the direction of the seed light incidence.

[0047] The other steps and parameters are the same as those in the first embodiment.

[0048] Specific embodiment three: the difference between the embodiment and the first or second embodiment is that the base frequency light module 11 excites the base frequency light one, the base frequency light one is horizontally incident through the base frequency light coupling lens group 10, is reflected by the base frequency light amplification mirror two 4, and then does periodic reflection movement between the first double optical amplification mirror 1 and the second double optical amplification mirror 2, and the horizontal displacement of the base frequency light one in each reflection is:

[0049] l1 = L2*tan a1 (3)

[0050] The final reflection number j1 approximately satisfies the formula:

[0051]

[0052] In the formula, d2 is the lens length of the first double optical amplification mirror 1 and the second double optical amplification mirror 2, L2 is the distance between the first double optical amplification mirror 1 and the second double optical amplification mirror 2, l1 is the horizontal displacement of the base frequency light one in each reflection, and a1 is the included angle between the horizontal incidence of the base frequency light one and the vertical direction z axis after being reflected by the base frequency light amplification mirror two 4.

[0053] Since it needs to conform to the actual meaning:

[0054] If j1 obtained is an integer, directly determine the parity;

[0055] If the obtained j1 has a decimal, do not discard it and round it up. Then determine whether j1 is par or even.

[0056] If j1 is even, the fundamental frequency light is emitted in the opposite direction to the incident direction.

[0057] If j1 is odd, the fundamental frequency light is emitted in the same direction as the incident light.

[0058] Other steps and parameters are the same as in specific implementation method one or two.

[0059] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the seed light and the fundamental frequency light are as follows... Figure 3 As shown, the periodic reflections between the two-beam magnifying mirror 1 and the two-beam magnifying mirror 2 will periodically produce cross-coupling at an angle of β1, satisfying the formula:

[0060] β1=α1+2α2 (5)

[0061] In the formula, β1 is the interaction angle between the fundamental frequency light and the seed light.

[0062] The other steps and parameters are the same as those in one of the specific implementation methods one to three.

[0063] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that, in the Raman crystal module 7, the seed light and the fundamental frequency light periodically intersect, resulting in a frequency shift. That is, the seed light frequency ν2 and the fundamental frequency light frequency ν1 satisfy the formula:

[0064]

[0065] In the formula ν is Planck's constant, Δν is the Raman shift caused by the collision of the fundamental light with the phonons in Raman crystal module 7, λ1 is the wavelength of the fundamental light, λ2 is the wavelength of the seed light; ν2=1 / λ2, ν1=1 / λ1;

[0066] The fundamental frequency light is either fundamental frequency light one or fundamental frequency light two; when Δν is fundamental frequency light one, λ1 is the wavelength of fundamental frequency light one and ν1 is the frequency of fundamental frequency light one; when Δν is fundamental frequency light two, λ1 is the wavelength of fundamental frequency light two and ν1 is the frequency of fundamental frequency light two.

[0067] The other steps and parameters are the same as those in one of the specific implementation methods one to four.

[0068] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that the seed light and the fundamental frequency light are as follows... Figure 3The periodic reflection intersection between the double optical amplification mirror one 1 and the double optical amplification mirror two 2 determines that the least interaction times correspond to the same single conversion gain of the seed light and the fundamental light and the cross conversion gain of the seed light and the fundamental light; the specific process is:

[0069] The wave equation and the matter equation are (a) in (7) and (b) in (7) respectively;

[0070]

[0071] In the formula, n is the refractive index of the seed light or the fundamental light in the Raman crystal module 7, c is the speed of light in vacuum, μ0 is the magnetic permeability in vacuum, P NL is the nonlinear electric polarization, Q is the phonon wave, T is the phonon lifetime, ω v is the angular frequency of the phonon, χ (3) is the nonlinear polarization, γ v is the dispersion response of the nonlinear polarization intensity, E is the electric field intensity of light, t is the action time of the seed light or the fundamental light in the Raman crystal module 7, ε0 is the fundamental light amplitude, and z0 is the displacement of the seed light or the fundamental light between the double optical amplification mirror one 1 and the double optical amplification mirror two 2;

[0072] In the formula (7), the fundamental light is the fundamental light one or the fundamental light two;

[0073] The formula (7) is also applicable to the fundamental light one and the fundamental light two;

[0074] There is an interaction angle β1 between the fundamental light one and the seed light, and the coupling equation formula (8) is obtained based on the formula (7);

[0075]

[0076]

[0077] In the formula, only j i , m2, cos(β1) 2 are different for the fundamental light one and the fundamental light two, and other quantities in the formula are applicable;

[0078] In the application, there are interaction angles β1 and β2 between the fundamental light one, the fundamental light two and the seed light; β1 is the interaction angle of the fundamental light one and the seed light; β2 is the interaction angle of the fundamental light two and the seed light;

[0079] The equal sign on the left side of the equal sign with plus and minus signs takes the plus sign, and the equal sign on the right side also takes the plus sign, the equal sign on the left side takes the minus sign, and the equal sign on the right side also takes the minus sign;

[0080] The plus and minus signs are the propagation directions, and generally two opposite directions of light with positive and negative signs are generated.

[0081] wherein n is the refractive index of the fundamental light in the Raman crystal module 7, z0 is the displacement of the fundamental light between the double optical amplification mirror one 1 and the double optical amplification mirror two 2 for a round trip, c is the speed of light in vacuum, t is the action time of the fundamental light in the Raman crystal module 7, n" is the refractive index of the seed light in the Raman crystal module 7, z0" is the displacement of the seed light between the double optical amplification mirror one 1 and the double optical amplification mirror two 2 for a round trip, t" is the action time of the seed light in the Raman crystal module 7, g0 is the Raman gain coefficient of the fundamental light when collinear, and g1 is the Raman gain coefficient of the seed light; is the intensity of the fundamental light, is the intensity of the positive direction fundamental light, is the intensity of the negative direction fundamental light, is the intensity of the seed light (i.e. first-order Stokes light), is the intensity of the positive direction seed light (i.e. first-order Stokes light), is the intensity of the negative direction seed light (i.e. first-order Stokes light), is the intensity of the positive direction second-order seed light (i.e. intensity of the positive direction second-order Stokes light (i.e. intensity of the higher-order first-order Stokes light)), is the intensity of the negative direction second-order seed light (i.e. intensity of the negative direction second-order Stokes light (i.e. intensity of the higher-order first-order Stokes light));

[0082] a1 is the loss coefficient of the fundamental light, a2 is the loss coefficient of the seed light (i.e. first-order Stokes light), K sp is the spontaneous Raman scattering coefficient, j 2-2 is the number of intersections of the seed light and the fundamental light in the Raman crystal module 7 (here, the number of intersections of the seed light and the fundamental light in the Raman crystal module 7), β1 is the interaction angle of the fundamental light and the seed light, wherein β1 = α1 + 2α2, m2 is the mutual coupling volume coefficient of the seed light and the fundamental light in the Raman crystal module 7, and the expression is

[0083]

[0084] wherein r is the spot radius, and b2 is the width of the Raman crystal module two 7 in the vertical direction;

[0085] It can be obtained that:

[0086] When 0≤β1<90°, m2 cos(β1) 2 g0

[0087] When the number of intersections j 2-2When the formula (10) is met, the single conversion gain of the seed light and the fundamental light one collinearly is the same as the cross conversion gain of the seed light and the fundamental light one, and the angle β1 is the maximum required angle, and the interaction times are the least;

[0088]

[0089] Wherein j 2-2 is the intersection times of the seed light and the fundamental light one in the Raman crystal;

[0090] When the angle β1 is further reduced, the intersection times ji are increased, and the cross conversion gain of the seed light and the fundamental light one is higher than the single conversion gain of the seed light and the fundamental light one collinearly; as shown in the formula (11). Figure 4

[0091] j 2-2 × m2 × cos 2 β1 < 1, the cross conversion gain of the seed light and the fundamental light one is less than the single conversion gain of the seed light and the fundamental light one collinearly;

[0092] j 2-2 × m2 × cos 2 β1 > 1, the cross conversion gain of the seed light and the fundamental light one is greater than the single conversion gain of the seed light and the fundamental light one collinearly.

[0093] The collinear conversion gain: that is, the seed light and the fundamental light one pass through the Raman crystal 7 once, the greater the overlapping degree, the higher the conversion efficiency; the conversion efficiency is the largest when collinear (that is, the seed light and the fundamental light are parallel and coincident); therefore, the overlapping degree is the largest when collinear, and the conversion efficiency is the largest; the overlapping degree is the smallest when the angle is crossed to 90°, and the conversion efficiency is smaller and smaller, and the conversion efficiency is 0 when 90°;

[0094] The cross conversion gain: the conversion efficiency when the seed light and the fundamental light one have a crossing angle; according to the present application, when the angle of the seed light and the fundamental light is certain, the seed light and the fundamental light can be periodically and multiple times intersected and converted in the Raman light crystal module 7;

[0095] The single conversion gain collinearly: although the overlapping volume is the largest when collinear, there is a saturation upper limit due to the increase of laser intensity, and the process and speed of this energy increase are not linearly increased, and the increase speed is smaller and smaller when approaching the saturation value. The seed light and the fundamental light overlap once in the Raman crystal, and the light intensity will increase once according to the overlapping volume. By controlling and selecting the crossing angle of the seed light and the fundamental light, and increasing the overlapping times in the Raman crystal, the energy conversion effect can be reached or even exceeded compared with the collinear case.

[0096] Since j 2-2 needs to meet the actual meaning, if the obtained j 2-2 has a decimal, the next one is not abandoned.​

[0097] Other steps and parameters are the same as one of the first to fifth embodiments.

[0098] The seventh embodiment is different from one of the first to sixth embodiments in that the LD pump source one 8 and the LD pump source two 9 are used as the excitation source.

[0099] The double optical amplification mirror one 1 and the double optical amplification mirror two 2 form the fundamental light resonant cavity.

[0100] The three elements of the laser are the excitation source, the working substance, and the resonant cavity.

[0101] The working substance is the fundamental light crystal module one 5 and the fundamental light crystal module two 6.

[0102] The LD pump source one 8 and the LD pump source two 9 horizontally output the pump light to the fundamental light crystal module one 5 and the fundamental light crystal module two 6; the fundamental light two is generated in the vertical direction of the laser, and the fundamental light two oscillates back and forth in the vertical direction between the double optical amplification mirror one 1 and the double optical amplification mirror two 2 without emission, further improving the amplification efficiency of the seed light.

[0103] At this time, the mutual coupling volume coefficient of the seed light and the fundamental light two in the Raman crystal module 7 is m1=1.

[0104] When the interaction angle of the fundamental light two and the seed light is β2=2α2 according to the geometric relationship as shown in the formula (10), the coupling equation is formula (11) Figure 3

[0105]

[0106] Where n' is the refractive index of the fundamental light two in the Raman crystal module 7, z0' is the displacement of the fundamental light two between the double optical amplification mirror one 1 and the double optical amplification mirror two 2, c is the speed of light in vacuum, t' is the action time of the fundamental light two in the Raman crystal module 7, n" is the refractive index of the seed light in the Raman crystal module 7, z0" is the displacement of the seed light between the double optical amplification mirror one 1 and the double optical amplification mirror two 2, t" is the action time of the seed light in the Raman crystal module 7, g0' is the Raman gain coefficient of the fundamental light two when collinear, and g1 is the Raman gain coefficient of the seed light. I2' is the fundamental light two light intensity, I2' is the positive direction fundamental light two light intensity, I2' is the negative direction fundamental light two light intensity, I1' is the seed light intensity, I1' is the positive direction seed light intensity, I1' is the negative direction seed light intensity, I1' is the positive direction seed light second-order light intensity, ​The negative direction seed light second order light intensity;

[0107] a1' is the loss coefficient of the fundamental light two, a2 is the loss coefficient of the seed light, K sp is the spontaneous Raman scattering coefficient, j 1-1 is the intersection times of the seed light and the fundamental light two in the Raman crystal; β2 is the interaction angle of the fundamental light two and the seed light; m1 is the seed light and the fundamental light two in the Raman crystal module 7 The volume coefficient of mutual coupling;

[0108] Due to the size of the fundamental light crystal module one 5 and the fundamental light crystal module two 6, the double light amplification mirror one 1 and the double light amplification mirror two 2, the size of the fundamental light two generated in the cavity will be in a larger elliptical shape, and the long axis basically covers the long side of the Raman crystal, so that the seed light is basically completely covered by the cavity fundamental light two;

[0109] The equal sign on the left side of the equal sign takes the plus sign, and the equal sign on the right side also takes the plus sign, the equal sign on the left side takes the minus sign, and the equal sign on the right side also takes the minus sign.

[0110] The plus and minus signs are the propagation directions, and generally two opposite directions of positive and negative light will be generated.

[0111] The interaction angle of the fundamental light two and the seed light oscillating in the resonant cavity is β2, and the corresponding minimum intersection times j 1-1 are:

[0112]

[0113] It can be seen that under a certain power density, the seed light and the fundamental light two will also produce cross conversion gain, and the greater the angle β2, the greater the interaction times j i required to achieve the collinear single conversion gain. When the angle β2 is small to a certain extent, it will even be higher than the collinear single conversion gain of the seed light and the fundamental light two.

[0114] In general, the fundamental light output by the two resonant cavities composed of the fundamental light module 11 and the double light amplification mirror one 1 and the double light amplification mirror two 2 will occur energy conversion with the seed light in the Raman crystal module 7, and realize the laser amplification of the seed light.

[0115] The other steps and parameters are the same as one of the first to sixth embodiments.

[0116] Embodiment eight: different from one of the first to seventh embodiments,

[0117] The size of the fundamental light crystal module one 5 and the fundamental light crystal module two 6 is a1×b1×c1 mm 3 ;

[0118] The size of the Raman crystal module 7 is a2 x b2 x c2 mm 3 ;

[0119] The size of the double optical amplification mirror one 1 and the double optical amplification mirror two 2 is d2 x e2 x f2 mm 3 ;

[0120] The a1 is the length of the horizontal direction of the fundamental frequency light crystal module one 5 and the fundamental frequency light crystal module two 6, the b1 is the width of the vertical direction of the fundamental frequency light crystal module one 5 and the fundamental frequency light crystal module two 6, the c1 is the height of the fundamental frequency light crystal module one 5 and the fundamental frequency light crystal module two 6, the a2 is the length of the horizontal direction of the Raman crystal module two 7, the b2 is the width of the vertical direction of the Raman crystal module two 7, the c2 is the height of the Raman crystal module two 7, the d2 is the length of the horizontal direction of the double optical amplification mirror one 1 and the double optical amplification mirror two 2, the e2 is the width of the vertical direction of the double optical amplification mirror one 1 and the double optical amplification mirror two 2, and the f2 is the height of the double optical amplification mirror one 1 and the double optical amplification mirror two 2;

[0121] The crystal module can be composed of multiple crystals, and the front, back, left and right of the light transmission direction are coated with high-transmission films for the fundamental frequency light, the seed light and the pump light.

[0122] The other steps and parameters are the same as one of the first to seventh embodiments.

[0123] The ninth embodiment is different from one of the first to eighth embodiments in that the Raman crystal module 7 is one of diamond, yttrium vanadate, potassium gadolinium tungstate, barium nitrate, lithium iodate and the like.

[0124] The other steps and parameters are the same as one of the first to eighth embodiments.

[0125] The tenth embodiment is different from one of the first to ninth embodiments in that the double optical amplification mirror one 1 and the double optical amplification mirror two 2 are coated with high-reflection films for the fundamental frequency light on the surfaces thereof;

[0126] The double optical amplification mirror one 1 and the double optical amplification mirror two 2 are coated with high-reflection films for the seed light on the surfaces thereof;

[0127] The seed light amplification mirror one 3 is coated with a high-reflection film for the seed light on the surface thereof;

[0128] The fundamental frequency light amplification mirror two 4 is coated with a high-reflection film for the fundamental frequency light on the surface thereof.

[0129] The other steps and parameters are the same as one of the first to ninth embodiments.

[0130] Example 1:

[0131] In order to enable the relevant personnel in the art to better understand the technical method of the present application, the technical solutions of the present application are further explained below in combination with the drawings of the present application. Based on the examples in the present application, other similar examples obtained by the ordinary skilled in the art without making creative efforts shall fall within the scope of protection of the present application.

[0132] The output method steps of the dual-optical amplification Raman laser of the present application are as follows:

[0133] First, the seed light module (13) excites seed light with a wavelength of λ2. Taking a diamond crystal as an example, the seed light wavelength λ2 = 1240 nm. The λ2 seed light is vertically incident through the seed light coupling lens group (12), is reflected by the seed light amplification mirror one (3) at an angle of 2α2 = 10°, the seed light is incident and maintains an angle of 2α2 with the z axis, passes through the fundamental light crystal module one (5), the Raman crystal module (7), and the fundamental light crystal module two (6), and the displacement of the light beam passing through the parallel flat plate is ignored here. The seed light reaches the dual-optical amplification mirror two (2) and is reflected at an angle of 2α2. After that, the seed light is periodically reflected between the dual-optical amplification mirror one (1) and the dual-optical amplification mirror two (2) at an angle of 2α2. Each reflection of the seed light moves horizontally by l2. The distance L2 between the dual-optical amplification mirror one (1) and the dual-optical amplification mirror two (2) is 40 mm. According to formula (1), l2 = 14.55 mm. When the lens length d2 of the dual-optical amplification mirror one (1) and the dual-optical amplification mirror two (2) is 40 mm, the reflection number j2 = 2.74 according to formula (2). At this time, it can be judged that the seed light is emitted after three periods of reflection. The direction of the emitted seed light is the same as that of the incident seed light.

[0134] Further, the fundamental light module (11) excites fundamental light with a wavelength of λ1. Taking a diamond crystal as an example, the fundamental light wavelength λ1 = 1064 nm. The fundamental light is incident horizontally through the fundamental light coupling lens group (10), is reflected by the fundamental light amplification mirror two (4), and maintains an angle of α1 = 12° with the z axis. The fundamental light passes through the fundamental light crystal module two (6), the Raman crystal module (7), and the fundamental light crystal module one (5). The displacement of the light beam passing through the parallel flat plate is ignored here. The fundamental light reaches the dual-optical amplification mirror one (1) and is reflected at an angle of α1. After that, the fundamental light is periodically reflected between the dual-optical amplification mirror one (1) and the dual-optical amplification mirror two (2) at an angle of α1. Each reflection of the fundamental light moves horizontally by l1. The distance L2 between the dual-optical amplification mirror one (1) and the dual-optical amplification mirror two (2) is 40 mm. According to formula (3), l1 = 17.80 mm. When the lens length d2 of the dual-optical amplification mirror one (1) and the dual-optical amplification mirror two (2) is 40 mm, the reflection number j1 = 2.24 according to formula (4). At this time, it can be judged that the fundamental light is emitted after three periods of reflection. The direction of the emitted fundamental light is the same as that of the incident fundamental light.

[0135] Seed light and fundamental light are periodically reflected and intersected between the double optical amplification mirror one (1) and the double optical amplification mirror two (2) as shown in the figure, which periodically generates β1 angle, which satisfies the formula: Figure 3

[0136] β1 = α1 + 2α2 = 22°

[0137] Therefore, in the Raman crystal module (7), the periodic intersection of seed light and fundamental light will cause frequency shift, that is, the frequency of seed light ν2 = 2.41*10 14 and the frequency of fundamental light ν1 = 2.81*10 14 satisfy the formula:

[0138]

[0139] ν2 = ν1 - Δν

[0140] wherein is the Planck constant, Δν is the Raman shift generated by the collision of incident photons and phonons in the crystal, λ1 is the wavelength of the fundamental light, and λ2 is the wavelength of the seed light; ν2 = 1 / λ2, ν1 = 1 / λ1;

[0141] Seed light will generate incident light and reflected light every time it is reflected, and the incident and outgoing will intersect, so the actual number of intersections is at least n2*2 = 4. According to formula (10), when the intersection angle is β1 = 22°, the crystal length b2 = 7mm, and the spot radius is 0.2mm. At this time, j 2-2 = 2.62 ≈ 3 intersections are required, which can achieve the same cross-conversion gain of seed light and fundamental light as the single conversion gain of seed light and fundamental light in the collinear mode. The actual gain coefficient corresponding to the fundamental light is j2m2cos(β1) 2 g0 = 1.63g0, so the gain coefficient is about 0.63 times higher than that of the collinear single conversion amplification mode.

[0142] Figure 1 ​​The LD pump source one (8) and the LD pump source two (9) are horizontally incident (1, the base frequency light amplification energy is provided by the incident 11; 2, the base frequency light oscillation can be generated between the 1, 2 mirrors, and the oscillation is also a kind of base frequency light amplification, after all, the function of the resonant cavity is also amplification; 3, the above two kinds of amplified base frequency light provide energy for the amplification of the seed light), energy is provided for the oscillation and amplification of the base frequency light, and the side-pumped base frequency light crystal module one (5) and the base frequency light crystal module two (6) provide energy for the periodic reflection of the base frequency and amplify the base frequency light. 1-1 When the minimum interaction times j 2 Therefore, the gain coefficient is improved by about 2.53 times compared with the single amplification mode of the collinear mode.

[0143] The base frequency light generated in different ways provides energy for the stimulated Raman scattering amplification process in the Raman crystal module, and improves the amplification effect of the seed light.

[0144] Embodiment 2:

[0145] The seed light source module (13) can be further expanded to output the second-order Stokes light module (13) with a wavelength of λ4, and the diamond crystal is taken as an example, the second-order Stokes wavelength λ4=1416nm, and the seed light coupling lens group (12) is replaced by the second-order Stokes light coupling lens group (12). The base frequency light module (11) is replaced by the first-order Stokes light module (11) with a wavelength of λ3, and the diamond crystal is taken as an example, the first-order Stokes wavelength λ3=1240nm.

[0146] Meanwhile, the film system of the double light amplification mirror one (1) and the double light amplification mirror two (2) is replaced by the high reflection film of the second-order Stokes light, the first-order Stokes light and the base frequency light.

[0147] The seed light mirror (3) is replaced by the second-order Stokes light mirror (3) coated with a second-order Stokes light high reflection film.

[0148] The base frequency light mirror (4) is replaced by the first-order Stokes light mirror (4) coated with a first-order Stokes light high reflection film.

[0149] The output method of the Raman laser of the embodiment is as follows:

[0150] First, the second-order Stokes light module (13) excites seed light with a wavelength of λ4. Taking a diamond crystal as an example, the seed light wavelength λ4=1416 nm. The λ4seed light is vertically incident through the second-order Stokes light coupling lens group (12), is reflected by the second-order Stokes light mirror (15) at an angle of 2α2=10°, and then the seed light is incident and kept at an angle of 2α2with the z axis, passes through the fundamental light crystal module one (5), the Raman crystal module (7), and the fundamental light crystal module two (6). Here, the displacement of the light beam passing through the parallel flat plate is ignored. The seed light reaches the double light amplification mirror two (2) and is reflected at an angle of 2α2. The seed light is periodically reflected between the double light amplification mirrors at an angle of 2α2each time. Each time the seed light moves horizontally by l2. The mirror spacing L2is 40 mm. According to formula (1), l2=14.55 mm. When the lens length d2=40 mm, formula (2) is obtained. j2=2.74. At this time, it can be judged that the seed light is emitted after three periods of reflection. The direction of the seed light emission is the same as that of the incident direction.

[0151] Further, the first-order Stokes light module (11) excites laser light with a wavelength of λ3. Taking a diamond crystal as an example, the first-order Stokes light wavelength λ1=1064 nm. The first-order Stokes light passes through the fundamental light coupling lens group (12) and is incident in the horizontal direction. It is reflected by the fundamental light mirror (4) and kept at an angle of α1=11° with the z axis. It passes through the fundamental light crystal module two (6), the Raman crystal module (7), and the fundamental light crystal module one (5). Here, the displacement of the light beam passing through the parallel flat plate is ignored. The first-order Stokes light reaches the amplification mirror two (1) and is reflected at an angle of α1. The seed light is periodically reflected between the amplification mirrors at an angle of α1each time. Each time the seed light moves horizontally by l1. The mirror spacing L2is 40 mm. According to formula (3), l1=16.16 mm. When the lens length d2=40 mm, formula (4) is obtained. j1=2.4751. At this time, it can be judged that the fundamental light is emitted after three periods of reflection. The direction of the fundamental light emission is the same as that of the incident direction.

[0152] As described above, the second-order Stokes light and the first-order Stokes light are periodically reflected and intersected, which periodically generates an angle β1, which satisfies the formula: Figure 3

[0153] β1=α1+2α2=21°

[0154] Therefore, in the Raman crystal module, the second-order and first-order Stokes light periodically intersect, which causes frequency shift, that is, the second-order Stokes light frequency ν4=2.11*10 14 (ν4=1 / λ4) and the first-order Stokes light frequency ν3=2.41*10 14 ​(ν3=1 / λ3) satisfies the formula:

[0155]

[0156] ν4=ν3-Δν

[0157] In the formula ν is Planck's constant, and Δν is the Raman shift caused by the collision of the incident photon with the phonon in the crystal. In the Raman crystal module (7), the second-order Stokes light periodically intersects with the first-order Stokes light, resulting in Raman shift and energy conversion, thus realizing the optical amplification of the second-order Stokes light.

[0158] Each reflection of the seed light involves both incident and reflected light, and the incident and reflected light intersect. Therefore, the minimum number of intersections is j2*2 = 4. According to formula (10), when the intersection angle is β1 = 21°, the crystal length b2 = 7 mm, and the light spot radius is 0.2 mm. At this time, at least j 2-2 =2.38≈3 intersections are sufficient to achieve the same cross-conversion gain between a second-order Stokes beam and a first-order Stokes beam as the single-transformation gain of a second-order Stokes beam and a first-order Stokes beam collinearly. The actual gain coefficient corresponding to the fundamental frequency beam is j2m2 cos(β1). 2 Since g0 = 1.77g0, the gain coefficient is increased by about 0.77 times compared to the collinear single-pass amplification mode.

[0159] Depend on Figure 1 The LD pump source one (8) and LD pump source two (9) are horizontally incident, providing energy for the oscillation and amplification of the fundamental frequency light. The side-pumped fundamental frequency light crystal module one (5) and fundamental frequency light crystal module two (6) provide energy for the periodically reflected fundamental frequency light to amplify the fundamental frequency light. Furthermore, since both the dual-beam amplification mirror one (1) and the dual-beam amplification mirror two (2) are coated with a high-reflection film for the 1064nm fundamental frequency light in the vertical direction of the z-axis, a resonant cavity for the 1064nm fundamental frequency light is formed in the vertical direction, causing the fundamental frequency light to oscillate along the z-axis. The angle of interaction between the fundamental frequency light oscillating in the resonant cavity and the first-order Stokes light is β2 = 10°. According to formula (12), the minimum number of interactions j is obtained. 1-1 When =1.06≈2, the same gain effect as when collinear can be achieved. In reality, each reflection of a first-order Stokes beam involves both incident and reflected light, and the incident and emitted light intersect at least once each. Therefore, the number of intersections is at least j2*2=4. The actual gain coefficient corresponding to the fundamental frequency light is j2m1 cos(β2). 2 g0 = 3.53g0, so the gain coefficient is about 2.53 times higher than that of the collinear single-pass amplification mode.

[0160] The fundamental light provides energy for the first order Stokes light amplification process in the Raman crystal module. The amplified first order Stokes light and the second order Stokes light interact in the Raman crystal at a β2 angle to achieve the effect of amplifying the second order Stokes light.

[0161] The present application can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, and these corresponding changes and modifications shall all belong to the protection scope of the claims of the present application.

Claims

1. A dual-amplified lumen Raman laser, characterized by: The double-amplification inner-cavity Raman laser comprises a double-optical-amplification mirror one (1), a double-optical-amplification mirror two (2), a seed light amplification mirror one (3), a fundamental light amplification mirror two (4), a fundamental light crystal module one (5), a fundamental light crystal module two (6), a Raman crystal module (7), an LD pump source one (8), an LD pump source two (9), a fundamental light coupling lens group (10), a fundamental light module (11), a seed light coupling lens group (12) and a seed light module (13). A coordinate axis is set, wherein the x-axis direction is a horizontal direction, the z-axis direction is a vertical direction, and the y-axis direction is determined according to the right-hand rule; The Raman crystal module (7) is vertically placed with the fundamental light crystal module one (5) and the fundamental light crystal module two (6) above and below, respectively; The fundamental light crystal module one (5), the Raman crystal module (7) and the fundamental light crystal module two (6) are closely placed to form a "sandwich" structure; The LD pump source one (8) and the LD pump source two (9) are placed horizontally on the fundamental light crystal module one (5) and the fundamental light crystal module two (6), respectively, and the pump light excited by the LD pump source one (8) is incident horizontally along the x-axis to the fundamental light crystal module one (5), and the pump light excited by the LD pump source two (9) is incident horizontally along the x-axis to the fundamental light crystal module two (6); The double-optical-amplification mirror one (1) is placed above the fundamental light crystal module one (5), and the double-optical-amplification mirror two (2) is placed below the fundamental light crystal module two (6) in the vertical direction of the "sandwich" structure; The seed light amplification mirror one (3) is placed at the left side of the double light amplification mirror one (1), and the angle between the seed light amplification mirror one (3) and the double light amplification mirror one (1) is ; The second fundamental frequency light amplification mirror (4) is placed at the right side of the double light amplification mirror (2), and the included angle between the second fundamental frequency light amplification mirror (4) and the double light amplification mirror (2) is according to the geometric relationship , is the included angle between the horizontal incidence of the fundamental frequency light and the vertical direction z-axis after the reflection of the fundamental frequency light by the second fundamental frequency light amplification mirror (4). The seed light module (13) comprises the seed light coupling lens group (12) and a seed light source, and is placed below the double-optical-amplification mirror two (2); The fundamental light module (11) comprises the fundamental light coupling lens group (10) and a fundamental light one, and is placed on one side of the fundamental light amplification mirror two (4).

2. The dual-amplified lumen Raman laser according to claim 1, wherein: The seed light module (13) excites seed light, which is vertically incident through the seed light coupling lens group (12), is reflected by the seed light amplification mirror one (3), and then makes periodic reflection between the double-optical-amplification mirror one (1) and the double-optical-amplification mirror two (2), and the horizontal displacement of the seed light after each reflection is: （1） Final number of reflections Satisfies the equation: （2） wherein, L is the lens length of the dual optical amplifying mirror one (1) and the dual optical amplifying mirror two (2), D is the distance between the dual optical amplifying mirror one (1) and the dual optical amplifying mirror two (2), S is the horizontal displacement of the seed light for each reflection, * is the multiplication sign; θ is the angle between the seed light amplifying mirror one (3) and the dual optical amplifying mirror one (1). If the result is is an integer, directly determine the parity; If the result is Rounding up to the nearest integer, then determine the parity; If For even values, the seed light exits in the opposite direction of the incident light. If For odd values of n, the seed light exits in the same direction as it enters.

3. The dual-amplified lumen Raman laser of claim 2, wherein: The fundamental light module (11) excites the fundamental light one, which is horizontally incident through the fundamental light coupling lens group (10), is reflected by the fundamental light amplification mirror two (4), and then makes periodic reflection between the double-optical-amplification mirror one (1) and the double-optical-amplification mirror two (2), and the horizontal displacement of the fundamental light one after each reflection is: （3） Final number of reflections satisfies the formula: （4） wherein, L is the lens length of the dual optical amplification mirror one (1) and the dual optical amplification mirror two (2), D is the distance between the dual optical amplification mirror one (1) and the dual optical amplification mirror two (2), S is the horizontal displacement of the fundamental light one for each reflection, θ is the angle between the fundamental light one horizontally incident after being reflected by the fundamental light amplification mirror two (4) and the vertical direction z axis. If the result is is an integer, directly determine the parity; If the result is Rounding up to the nearest integer, then determine the parity; If When the number is even, the fundamental light exits in the direction opposite to the incident direction. If For odd, the fundamental light exits in the same direction as it enters.

4. The dual-amplified lumen Raman laser of claim 3, wherein: The seed light and the fundamental light are periodically reflected and intersected between the double optical amplification mirror one (1) and the double optical amplification mirror two (2), and an angle of The cross coupling satisfies the formula: （5） In the formula is the interaction angle of the fundamental light and the seed light.

5. The dual-amplified lumen Raman laser of claim 4, wherein: In the Raman crystal module (7), the seed light and the fundamental light periodically intersect, frequency translation occurs, i.e. the seed light frequency and the fundamental light frequency satisfy the formula: （6） wherein is the Planck constant, is the Raman shift generated by the collision of the fundamental light with phonons in the Raman crystal module (7), is the fundamental light wavelength, is the seed light wavelength; , ; The fundamental light is the fundamental light one or the fundamental light two.

6. The dual-amplified lumen Raman laser of claim 5, wherein: The seed light and the fundamental light one make periodic reflection between the double-optical-amplification mirror one (1) and the double-optical-amplification mirror two (2), and the least interaction times correspond to the case that the in-line single conversion gain of the seed light and the fundamental light one is equal to the cross conversion gain of the seed light and the fundamental light one; the specific process is as follows: There is an interaction angle between the fundamental light and the seed light , and the coupling equation formula (8) is obtained. （8） wherein is the refractive index of the fundamental light one in the Raman crystal module (7), is the displacement of the fundamental light one between the double optical amplification mirror one (1) and the double optical amplification mirror two (2) for a round trip, is the speed of light in vacuum, is the time of action of the fundamental light one in the Raman crystal module (7), is the refractive index of the seed light in the Raman crystal module (7), is the displacement of the seed light between the double optical amplification mirror one (1) and the double optical amplification mirror two (2) for a round trip, is the time of action of the seed light in the Raman crystal module (7), is the Raman gain coefficient of the fundamental light one when collinear, is the Raman gain coefficient of the seed light; is the intensity of the fundamental light one, is the intensity of the fundamental light one in the positive direction, is the intensity of the fundamental light one in the negative direction, is the intensity of the seed light, is the intensity of the seed light in the positive direction, is the intensity of the seed light in the negative direction, is the intensity of the second order light of the seed light in the positive direction, is the intensity of the second order light of the seed light in the negative direction; is the loss coefficient of the fundamental light one, is the loss coefficient of the seed light, is the spontaneous Raman scattering coefficient, is the number of intersections of the seed light and the fundamental light one in the Raman crystal module (7), is the interaction angle of the fundamental light one and the seed light, wherein , is the mutual coupling volume coefficient of the seed light and the fundamental light one in the Raman crystal module (7), expressed as (9) In the formula is the spot radius, is the width of the Raman crystal module (7) in the vertical direction; When the intersection times When the formula (10) is met, the single conversion gain of the seed light and the fundamental light is the same as the intersection conversion gain of the seed light and the fundamental light, and the angle is the maximum value of the required angle, and is the least interaction times corresponding to the minimum (10) wherein is the number of intersections of the seed light and the fundamental light in the Raman crystal.

7. The dual-amplified lumen Raman laser of claim 6, wherein: The LD pump source one (8) and the LD pump source two (9) are used as excitation sources. The double optical amplification mirror one (1) and the double optical amplification mirror two (2) constitute a fundamental light resonant cavity; The three elements of the laser are: an excitation source, a working substance, and a resonant cavity; The working substance is a fundamental light crystal module one (5) and a fundamental light crystal module two (6); The LD pump source one (8) and the LD pump source two (9) horizontally output pump light to the fundamental light crystal module one (5) and the fundamental light crystal module two (6); the fundamental light two is generated in the vertical direction of the laser, and the fundamental light two oscillates back and forth in the vertical direction between the double optical amplification mirror one (1) and the double optical amplification mirror two (2) without being emitted; The seed light and the fundamental light are coupled to each other in the Raman crystal module (7) with a coupling volume coefficient of ; When the interaction angle of the fundamental light and the seed light is At this time, the coupling equation is formula (11) (11) wherein is the refractive index of the second fundamental light in the Raman crystal module (7), is the displacement of the second fundamental light between the double optical amplification mirror one (1) and the double optical amplification mirror two (2) for a round trip, is the speed of light in vacuum, is the time of action of the second fundamental light in the Raman crystal module (7), is the refractive index of the seed light in the Raman crystal module (7), is the displacement of the seed light between the double optical amplification mirror one (1) and the double optical amplification mirror two (2) for a round trip, is the time of action of the seed light in the Raman crystal module (7), is the Raman gain coefficient of the second fundamental light when collinear, is the Raman gain coefficient of the seed light; is the intensity of the second fundamental light, is the intensity of the second fundamental light in the positive direction, is the intensity of the second fundamental light in the negative direction, is the intensity of the seed light, is the intensity of the seed light in the positive direction, is the intensity of the seed light in the negative direction, is the intensity of the second order light of the seed light in the positive direction, is the intensity of the second order light of the seed light in the negative direction; is a loss coefficient of the second fundamental light, is a loss coefficient of the seed light, is a spontaneous Raman scattering coefficient, is a number of intersections of the seed light and the second fundamental light in the Raman crystal; is an interaction angle of the second fundamental light and the seed light; is a mutual coupling volume coefficient of the seed light and the second fundamental light in the Raman crystal module (7). The interaction angle of the fundamental light oscillating in the resonant cavity and the seed light is The corresponding minimum intersection times is: (12)。 8. The dual-amplified lumen Raman laser of claim 7, wherein: The fundamental light crystal module one (5) and the fundamental light crystal module two (6) are both ; The Raman crystal module (7) has dimensions of ; The size of the double optical amplification mirror one (1) and the double optical amplification mirror two (2) is ; The L1 is the length of the fundamental light crystal module one (5) and the fundamental light crystal module two (6) in the horizontal direction, W1 is the width of the fundamental light crystal module one (5) and the fundamental light crystal module two (6) in the vertical direction, H1 is the height of the fundamental light crystal module one (5) and the fundamental light crystal module two (6), L2 is the length of the Raman crystal module (7) in the horizontal direction, W2 is the width of the Raman crystal module (7) in the vertical direction, H2 is the height of the Raman crystal module (7), L3 is the length of the double light amplification mirror one (1) and the double light amplification mirror two (2) in the horizontal direction, W3 is the width of the double light amplification mirror one (1) and the double light amplification mirror two (2) in the vertical direction, H3 is the height of the double light amplification mirror one (1) and the double light amplification mirror two (2).

9. The dual-amplified lumen Raman laser of claim 8, wherein: The Raman crystal module (7) is one of diamond, yttrium vanadate, potassium gadolinium tungstate, barium nitrate, and lithium iodate.

10. The dual-amplified lumen Raman laser of claim 9, wherein: The double optical amplification mirror one (1) and the double optical amplification mirror two (2) are coated with high-reflection film for the fundamental light; The double optical amplification mirror one (1) and the double optical amplification mirror two (2) are coated with high-reflection film for the seed light; The seed light amplification mirror one (3) is coated with high-reflection film for the seed light; The fundamental light amplification mirror two (4) is coated with high-reflection film for the fundamental light.

Images