Dysprosium ion activated yellow light and ultraviolet dual-wavelength laser

Abstract

The invention discloses a dysprosium ion activated yellow light and ultraviolet dual-wavelength laser, which relates to the laser technology and comprises a pumping source, an optical focusing system, a laser resonant cavity and a laser switching output device which are connected in sequence, an input mirror and an output mirror are arranged at the two ends of the light passing direction of the laser resonant cavity respectively. One side of the mirror cavity of the input mirror and one side of the mirror cavity of the output mirror are plated with corresponding dielectric films; a non-centrosymmetric borate crystal doped with Dy < 3 + > ions is arranged in the laser resonant cavity; and the laser switching output device is used for controlling, switching and outputting the generated yellow light and ultraviolet light. According to the invention, the Dy < 3 + > ion-doped non-centrosymmetric borate crystal and the laser resonant cavity are utilized to realize dual-wavelength generation and output of yellow light and ultraviolet light.

Description

Technical Field

[0001] The invention relates to the technical field of laser equipment, and more particularly to a yellow light and ultraviolet dual-wavelength laser activated by dysprosium ions. Background Art

[0002] At present, Dy pumped by blue diode laser 3+ Doping laser crystals is a common method to obtain yellow lasers. In previous studies, the laser crystals used were mainly fluorides with low phonon energy and oxide crystals with high phonon energy, including LiYF 4 、LiLuF 4 , Y 3 Al 5 O 12 、ZnWO 4 , GdMgB 5 O 10 、LaMgB 5 O 10 The highest yellow laser power reached 628mW. However, all Dy-doped nanoparticles that can achieve yellow laser power reported so far are 3+ Laser crystals are all centrosymmetric crystals and have no nonlinear frequency doubling effect, so they cannot simultaneously generate lasers in other bands, such as ultraviolet light. 3+ Neither yellow laser crystals nor lasers have the ability to achieve simultaneous operation of yellow lasers and ultraviolet lasers.

[0003] So how to use Dy 3+ Doping laser crystals to achieve dual-wavelength output of yellow and ultraviolet lasers is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides a dysprosium ion activated yellow light and ultraviolet dual wavelength laser.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A dysprosium ion activated yellow and ultraviolet dual wavelength laser, comprising a pump source, an optical focusing system, a laser resonant cavity and a laser switching output device connected in sequence;

[0007] Wherein, an input mirror and an output mirror are respectively arranged at both ends of the light transmission direction of the laser resonant cavity; one side of the mirror cavity of the input mirror is coated with a dielectric film with high transmittance of 350nm-500nm and high reflection of 550-600nm and 275-300nm; one side of the mirror cavity of the output mirror is coated with a dielectric film with high reflection of 350nm-500nm band, partial transmission of 550nm-600nm band, and high transmittance of 275nm-300nm;

[0008] The laser resonant cavity is provided with Dy doped 3+ Ionic non-centrosymmetric borate crystal; the laser switching output device is used to control and switch the output of the generated yellow light and ultraviolet light.

[0009] Preferably, the non-centrosymmetric borate crystals of the present invention include lanthanum calcium borate crystals La 2 CaB 10 O 19 、Yttrium calcium oxide borate crystal YCa 4 O(BO 3 ) 3 , Yttrium aluminum borate crystal YAl 3 (BO 3 ) 4 Or sodium lanthanum borate crystal Na 3 La 9 O 3 (BO 3 ) 8 ;

[0010] Among them, calcium lanthanum borate crystal La 2 CaB 10 O 19 The space group is C2; Yttrium calcium oxide borate crystal YCa 4 O(BO 3 ) 3 The space group is Cm; yttrium aluminum borate crystal YAl 3 (BO 3 ) 4 The space group of the crystal is R32; the sodium lanthanum borate crystal Na 3 La 9 O 3 (BO 3 ) 8 The space group is P-62m.

[0011] Preferably, Dy is doped 3+ In non-centrosymmetric borate crystals, Dy 3+ The doping concentration of the ions is 0.1%-50%, more preferably 1%-30%, specifically 1%, 2%, 3%, 5%, 10%, 15%.

[0012] Preferably, the light-transmitting surface of the non-centrosymmetric borate crystal includes a circle, a square or a rectangle.

[0013] Preferably, the non-centrosymmetric borate crystal has a crystal length of 5 mm to 30 mm in the light transmission direction.

[0014] Preferably, the pump source is used to emit a laser wavelength of 350nm-500nm, including a blue light diode laser or an all-solid-state frequency-doubled blue light laser.

[0015] Preferably, the laser switching output device includes a rotating shaft, and the output end of the rotating shaft is provided with a yellow light filter for outputting yellow light and an ultraviolet light filter for outputting ultraviolet light. When the rotating shaft rotates, the yellow light filter or the ultraviolet light filter can be rotated to the output light path of the laser resonant cavity.

[0016] Preferably, the yellow light filter and the ultraviolet light filter each include a plurality, and each yellow light filter and each ultraviolet light filter are evenly spaced and arranged at the output end of the rotating shaft.

[0017] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a dysprosium ion activated yellow light and ultraviolet dual wavelength laser, which has the following beneficial effects:

[0018] The present invention utilizes doped Dy 3+ The non-centrosymmetric borate crystal of ions and the resonant laser cavity realize the dual-wavelength generation of yellow light and ultraviolet light, and the switching output of yellow light and ultraviolet light is realized with the help of a laser switching output device.

[0019] The present invention utilizes the high phonon energy of borate laser crystals to enhance the electron-lattice coupling effect of the crystal, thereby reducing Dy 3+ Ionic 6 H 13 / 2 The lower energy level lifetime improves the efficiency of yellow light laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of the dysprosium ion activated yellow and ultraviolet dual-wavelength laser provided by the present invention;

[0022] Figure 2 The yellow light and ultraviolet dual-wavelength laser activated by dysprosium ions provided by the present invention realizes a yellow light laser wavelength output spectrum.

[0023] Figure 3 The dysprosium ion-activated yellow light and ultraviolet dual-wavelength laser provided by the present invention realizes the phase matching angle calculation of the ultraviolet laser.

[0024] Figure 4 This is a schematic diagram of the structure of the laser switching output device provided by the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of multiple filters in the laser switching output device provided by the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, the embodiment of the present invention discloses a dysprosium ion activated yellow light and ultraviolet dual wavelength laser, comprising: a pump source 1, an optical focusing system 2, a resonant cavity input mirror 3, a laser crystal 4, a resonant cavity output mirror 5, and a laser switching output device 6; the laser crystal is located in the laser resonant cavity; the laser resonant cavity is composed of an input mirror 3 and an output mirror 5, and a dielectric film of a corresponding wavelength band is plated on one side of the mirror cavity;

[0028] The pump light emitted by the pump source 1 is collimated by the optical focusing system 2, enters the laser resonant cavity through the input mirror 3, and is incident on the laser crystal 4. The laser crystal 4 absorbs the pump energy and undergoes energy level transition, and outputs a laser beam consisting of continuous wave yellow laser and ultraviolet laser at one end of the output mirror 5. The laser beam passes through the laser switching output device 6 to realize the switching output of yellow laser and ultraviolet laser, so that the laser can output yellow laser or ultraviolet laser.

[0029] One side of the mirror cavity of the input mirror 3 is coated with a dielectric film A, or the incident end face of the laser dielectric crystal is coated with a dielectric film A, and the dielectric film A has high transmittance at 350nm-500nm and high reflectivity at 550-600nm and 275-300nm.

[0030] One side of the cavity mirror of the output mirror 5 is coated with a dielectric film B, which has high reflection in the 350nm-500nm band, partial transmission in the 550nm-600nm band, and high transmission in the 275nm-300nm band.

[0031] In another embodiment, a dielectric film B may also be plated on the output end face of the laser dielectric crystal.

[0032] The laser switching output device includes a rotating shaft, and the output end of the rotating shaft is provided with a yellow light filter for outputting yellow light and an ultraviolet light filter for outputting ultraviolet light. When the rotating shaft rotates, the yellow light filter or the ultraviolet light filter can be rotated to the output optical path of the laser resonant cavity. The yellow light filter is plated with a dielectric film C, which has high transmittance to the 557nm-586nm yellow light band and high reflection to other bands; the ultraviolet light filter is plated with a dielectric film D, which has high transmittance to the 278nm-293nm ultraviolet band and high reflection to other bands. The laser switching output device can switch to output yellow laser or ultraviolet laser.

[0033] The laser crystal 3 is a non-centrosymmetric laser crystal, including but not limited to dysprosium ion-doped calcium lanthanum borate crystal, yttrium oxide calcium borate crystal, yttrium aluminum borate crystal or sodium lanthanum borate crystal. 3+ The doping concentration is 0.1%-2%. The light-transmitting surface of the laser crystal 3 is round, square or rectangular, polished and coated with a dielectric film of certain conditions or uncoated, and the length in the light-transmitting direction is 1mm-50mm, and the preferred crystal length is 5mm-30mm.

[0034] The present invention is further described below with reference to different embodiments.

[0035] Example 1

[0036] The dysprosium ion-doped borate laser crystal and the all-solid-state yellow laser of the present invention are composed of a pump source 1, an optical focusing system 2, a resonant cavity input mirror 3, a borate laser crystal 4, a resonant cavity output mirror 5, and a filter 6 arranged in sequence. The pump source 1 is a blue light diode laser with an emission wavelength of 450nm, and the optical focusing system 2 is a focusing mirror with a focal length of 10cm. The pump light emitted by the pump source 1 is collimated by the optical focusing system 2, enters the laser resonant cavity through the input mirror 3, and is incident on the laser crystal 4. The input mirror 3 is a flat mirror, which is coated with a dielectric film with high transmittance to 350nm-500nm and high reflection to 550-600nm and 275-300nm; the laser crystal 4 is dysprosium ion-doped calcium lanthanum borate La 2 CaB 10 O 19 Crystal, doping concentration is 5%, crystal length is 15mm, light-transmitting surface is 3×3mm 2 , double-sided polishing; output mirror 5 is a concave mirror with a curvature of 100mm, coated with a dielectric film with high reflection in the 350nm-500nm band, a transmittance of 0.1% in the 550nm-600nm band, and a transmittance of 99% in the 275nm-300nm band. By increasing the pump source power, 574nm and 575nm yellow laser output can be achieved respectively, and its wavelength is as follows Figure 2 shown. Figure 2The horizontal axis is wavelength (nm) and the vertical axis is intensity (arbitrary unit). 2 CaB 10 O 19 The nonlinear frequency doubling characteristics of the crystal can achieve frequency doubling of yellow laser light to generate ultraviolet laser light with wavelengths of 287nm and 287.5nm. The phase matching curve is shown in Figure 3 shown. Figure 3 The horizontal axis is the phase matching angle, and the vertical axis is the wavelength (nm).

[0037] The laser switching output device 6 can realize the switching and control of yellow laser and ultraviolet laser to meet application requirements.

[0038] like Figure 4 , Figure 5 As shown, in a specific embodiment, the laser switching output device includes a rotating shaft 601, and a yellow light filter 602 for outputting yellow light and an ultraviolet light filter 603 for outputting ultraviolet light are arranged at the output end of the rotating shaft 601. The rotating shaft is driven by a rotating motor 604. When the rotating shaft rotates, the yellow light filter 602 or the ultraviolet light filter 603 can be rotated to the output optical path of the laser resonant cavity. The yellow light filter 602 and the ultraviolet light filter 603 each include a plurality of them, and each yellow light filter and each ultraviolet light filter are evenly spaced and arranged at the output end of the rotating shaft.

[0039] In another embodiment, the yellow light filter and the ultraviolet light filter can also be selectively moved to the output light path of the laser by lifting.

[0040] It is worth explaining that the relevant structural diagrams of the device in this application are only schematic diagrams. Except for the key components shown in the diagrams, other connecting components and protective components such as the outer casing are not shown in the schematic diagrams.

[0041] Example 2

[0042] As described in Example 1, the difference is that the pump source 1 is an all-solid-state frequency-doubled ultraviolet laser with an emission wavelength of 355 nm, and other conditions are consistent with those described in Example 1.

[0043] Example 3

[0044] As described in Example 1, the difference is that the laser crystal 4 is a dysprosium ion-doped calcium lanthanum borate crystal with a length of 6 mm, 8 mm or 10 mm, and other conditions are consistent with those described in Example 1.

[0045] Example 4

[0046] As described in Example 1, the difference is that the laser crystal 4 is a calcium lanthanum borate crystal doped with dysprosium ions at a doping concentration of 1%, 2%, 3%, and 10%, and other conditions are consistent with those described in Example 1.

[0047] Example 5

[0048] As described in Example 1, the difference is that the output mirror 5 is plated with high reflection for the 350nm-500nm band, the transmittance for the 550nm-600nm band is 2%-5%, the transmittance for the 275nm-300nm band is 99%, and the other conditions are consistent with those described in Example 1.

[0049] Example 6

[0050] As described in Example 1, the difference is that the output mirror 5 is a concave mirror with a curvature of 50 mm, 150 mm, and 200 mm. Other conditions are consistent with those described in Example 1.

[0051] Example 7

[0052] As described in Example 1, the difference is that the laser crystal 4 is a yttrium calcium oxide borate crystal YCa doped with dysprosium ions. 4 O(BO 3 ) 3 , the dysprosium ion doping concentration is 0.1%-30%.

[0053] Example 8

[0054] As described in Example 1, the difference is that the laser crystal 4 is a yttrium aluminum borate crystal YAl 3 (BO 3 ) 4 , the dysprosium ion doping concentration is 0.1%-30%.

[0055] Example 9

[0056] As described in Example 1, the difference is that the laser crystal 4 is a sodium lanthanum borate crystal Na doped with dysprosium ions. 3 La 9 O 3 (BO 3 ) 8 , the dysprosium ion doping concentration is 0.1%-30%.

[0057] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0058] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dysprosium ion activated yellow and ultraviolet dual wavelength laser, characterized in that: It includes a pump source, an optical focusing system, a laser resonant cavity and a laser switching output device connected in sequence; Wherein, an input mirror and an output mirror are respectively arranged at both ends of the light transmission direction of the laser resonant cavity; one side of the mirror cavity of the input mirror is coated with a dielectric film with high transmittance of 350nm-500nm and high reflection of 550-600nm and 275-300nm; one side of the mirror cavity of the output mirror is coated with a dielectric film with high reflection of 350nm-500nm band, partial transmission of 550nm-600nm band, and high transmittance of 275nm-300nm; The laser resonant cavity is provided with Dy doped 3+ Ionic non-centrosymmetric borate crystal; the laser switching output device is used to control and switch the output of the generated yellow light and ultraviolet light.

2. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 1, characterized in that: The non-centrosymmetric borate crystals include lanthanum calcium borate crystals La2CaB 10 O 19 , yttrium calcium oxide borate crystals YCa4O(BO3)3, yttrium aluminum borate crystals YAl3(BO3)4 or sodium lanthanum borate crystals Na3La9O3(BO3)8; Among them, lanthanum calcium borate crystal La2CaB 10 O 19 The space group of yttrium calcium oxide borate crystal YCa4O(BO3)3 is Cm; the space group of yttrium aluminum borate crystal YAl3(BO3)4 is R32; the space group of sodium lanthanum borate crystal Na3La9O3(BO3)8 is P-62m.

3. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 1, characterized in that: Dy doping 3+ In non-centrosymmetric borate crystals, Dy 3+ The doping concentration of ions is 0.1%-50%.

4. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 1, characterized in that: The light-transmitting surface of the non-centrosymmetric borate crystal includes a circle, a square or a rectangle.

5. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 1, characterized in that: The non-centrosymmetric borate crystal has a crystal length of 5 mm to 30 mm in the light transmission direction.

6. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 1, characterized in that: The pump source is used to emit a laser wavelength of 350nm-500nm, including a blue light diode laser or an all-solid-state frequency-doubled blue light laser.

7. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 1, characterized in that: The laser switching output device includes a rotating shaft, and the output end of the rotating shaft is provided with a yellow light filter for outputting yellow light and an ultraviolet light filter for outputting ultraviolet light. When the rotating shaft rotates, the yellow light filter or the ultraviolet light filter can be rotated to the output light path of the laser resonant cavity.

8. The dysprosium ion activated yellow and ultraviolet dual wavelength laser according to claim 7, characterized in that: The yellow light filter and the ultraviolet light filter each include a plurality of them, and each yellow light filter and each ultraviolet light filter are evenly spaced and arranged at the output end of the rotating shaft.

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