An optical parametric oscillator with adjustable optical frequency

Abstract

The present invention provides an optical parametric oscillator with adjustable optical frequency, which belongs to the technical field of optical parametric oscillators, and includes: a transmitting component emits a first laser, and injects it into an oscillating component for a nonlinear process to obtain a third laser and a fourth laser with different wavelengths. A dimming component is arranged at the output end of the oscillating component, and the state of the dimming component can be adjusted to make only the third laser be emitted after transmission, or only the fourth laser be emitted after transmission. In this way, the wavelength of the emitted laser can be adjusted by only adjusting the state of the dimming component, and the operation is simple and fast, and it is convenient and fast to switch.

Description

Technical Field

[0001] The present invention generally relates to the technical field of optical parametric oscillators, and in particular to an optical parametric oscillator with adjustable optical frequency. Background Art

[0002] The existing optical parametric oscillator includes a baseband module to emit an initial laser, and uses an oscillator to perform a nonlinear process on the initial laser to obtain idler light, signal light, and initial laser with lower energy. The idler light, signal light, and initial laser have different wavelengths, and different usage scenarios require the emission of lasers of different wavelengths.

[0003] However, existing optical parametric oscillators can only change the wavelength of the output laser by adjusting the wavelength of the initial laser of the baseband module or by nonlinearizing the oscillator. Since there is an angle between the main axis of the crystal and the geometric axis, one of the adjustment methods is to drive the crystal to rotate by the galvanometer motor to adjust the wavelength of the signal light.

[0004] Since this method of adjusting the wavelength of the emitted laser requires relatively complex operations, it is not convenient to quickly switch the wavelength of the emitted laser. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an optical parametric oscillator with adjustable optical frequency.

[0006] The present invention provides an optical parametric oscillator capable of adjusting optical frequency, comprising:

[0007] An emitting component, the emitting component is used to emit a first laser;

[0008] an oscillating component, the oscillating component being used to receive the first laser and perform a nonlinear process on the first laser to obtain a third laser and a fourth laser with different wavelengths;

[0009] The third laser and the fourth laser are emitted from the emission end of the oscillating component;

[0010] A dimming component is arranged at the emission end of the oscillating component and is used to adjust the emission of the third laser or the fourth laser.

[0011] According to the technical solution provided by the present invention, the dimming component includes:

[0012] a first lens and a second lens;

[0013] The first lens is used to transmit the third laser and reflect the fourth laser;

[0014] The second lens is used to reflect the third laser and transmit the fourth laser;

[0015] The dimming component has a first state and a second state;

[0016] When in the first state, the first lens is at the exit end of the oscillating component;

[0017] When in the second state, the second lens is located at the exit end of the oscillating component.

[0018] The technical solution provided by the present invention also includes:

[0019] The first light absorbing device and the oscillating component are respectively located on both sides of the normal line of the first lens or the second lens, and are used to absorb the fourth laser reflected by the first lens or the third laser reflected by the second lens.

[0020] According to the technical solution provided by the present invention, the emitting component is also used to emit a fifth laser; the wavelength of the fifth laser is equal to a set multiple of the wavelength of the first laser;

[0021] The optical parametric oscillator further includes: a third lens and a fourth lens sequentially arranged along the fifth laser emission direction;

[0022] The dimming component also includes: a fifth lens; the dimming component also has a third state, and when in the third state, the fifth lens is at the exit end of the oscillation component; after the fifth laser is emitted from the emitting component, it is transmitted by the third lens, reflected by the fourth lens and reflected by the fifth lens and then emitted.

[0023] According to the technical solution provided by the present invention, a second light absorbing device is fixedly installed on a side of the fifth lens close to the third lens;

[0024] When the fifth lens is located between the third lens and the fourth lens and is located on the optical path of the fifth laser, it is used to absorb the fifth laser.

[0025] According to the technical solution provided by the present invention, the transmitting assembly includes:

[0026] A baseband module, the baseband module is used to emit a fifth laser;

[0027] a frequency doubling module, the frequency doubling module being used to convert the fifth laser into the first laser after receiving the fifth laser;

[0028] The frequency multiplication module has a fourth state and a fifth state;

[0029] When in the fourth state, the frequency doubling module is in the optical path of the fifth laser, and the emitting component emits the first laser; when in the fifth state, the frequency doubling module is not in the optical path of the fifth laser, and the emitting component emits the fifth laser.

[0030] According to the technical solution provided by the present invention, the transmitting assembly further includes:

[0031] The tenth lens is disposed between the baseband module and the frequency doubling module, and is used to reflect the fifth laser emitted by the baseband module to the frequency doubling module.

[0032] According to the technical solution provided by the present invention, the oscillation component includes:

[0033] An eighth lens, a crystal and a sixth lens are sequentially arranged along the emission direction of the third laser and the fourth laser;

[0034] After the first laser is emitted from the emitting component, it is reflected by the third lens and the sixth lens successively and then enters the crystal; the crystal is used to perform a nonlinear process on the first laser to obtain an output laser;

[0035] The output laser includes: the third laser and the fourth laser; the third laser and the fourth laser are reflected by the eighth lens, transmitted by the crystal and the sixth lens, and then emitted from the output end of the oscillating component.

[0036] According to the technical solution provided by the present invention, the oscillation component further includes:

[0037] A ninth lens is arranged on a side of the sixth lens away from the crystal, and is used for transmitting only the third laser and the fourth laser.

[0038] According to the technical solution provided by the present invention, the oscillating assembly further includes: a seventh lens disposed between the crystal and the eighth lens;

[0039] The transmitting assembly further comprises a third light absorbing device arranged on a side of the tenth lens away from the frequency doubling module;

[0040] The output laser further includes: a second laser having a wavelength equal to that of the first laser;

[0041] After being emitted from the crystal, the second laser is reflected by the seventh lens, the sixth lens and the third lens in sequence, and then enters the third light absorbing device; the third light absorbing device is used to absorb the second laser.

[0042] The beneficial effects of the present invention are:

[0043] The transmitting component emits the first laser, and injects it into the oscillating component for a nonlinear process, thereby obtaining a third laser and a fourth laser with different wavelengths. The dimming component is arranged at the output end of the oscillating component, and the state of the dimming component can be adjusted to make only the third laser be emitted after transmission, or only the fourth laser be emitted after transmission. In this way, the wavelength of the emitted laser can be adjusted by simply adjusting the state of the dimming component, which is simple and fast to operate and convenient for quick switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0045] Figure 1 is a schematic diagram of a dimming component in a first state;

[0046] Figure 2 is a schematic diagram of a dimming component in a second state;

[0047] Figure 3 is a schematic diagram of a dimming component in a third state;

[0048] Among them: 1. Oscillating component; 2. Dimming component; 3. First lens; 4. Second lens; 5. First light absorbing device; 6. Transmitting component; 7. Third lens; 8. Fourth lens; 9. Fifth lens; 10. Second light absorbing device; 11. Baseband module; 12. Frequency doubling module; 13. Tenth lens; 14. Third light absorbing device; 15. Sixth lens; 16. Crystal; 17. Seventh lens; 18. Eighth lens; 19. Ninth lens;

[0049] 01, first laser; 02, second laser; 03, third laser; 04, fourth laser; 05, fifth laser. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] Please refer to Figure 1 The present invention provides an optical parametric oscillator with adjustable optical frequency, comprising:

[0053] An emitting component 6, wherein the emitting component 6 is used to emit a first laser 01;

[0054] An oscillating component 1, the oscillating component 1 is used to receive the first laser 01, and perform a nonlinear process on the first laser 01 to obtain a third laser 03 and a fourth laser 04 with different wavelengths;

[0055] The third laser 03 and the fourth laser 04 are emitted from the emission end of the oscillating component 1;

[0056] A dimming component 2 is arranged at the emission end of the oscillation component 1 and is used for adjusting the emission of the third laser 03 or the fourth laser 04 .

[0057] Specifically, the dimming component 2 is arranged at the emission end of the oscillating component 1, and the state of the dimming component 2 can be adjusted. In one state, the dimming component 2 only transmits the third laser 03 and then emits; in another state, the dimming component 2 only transmits the fourth laser 04 and then emits.

[0058] This method can adjust the wavelength of the emitted laser by simply adjusting the state of the dimming component 2. The operation is simple and fast, and it is convenient for rapid switching. Since the speed of light is constant, the wavelength of the adjusted light is equal to the frequency of the adjusted light.

[0059] Furthermore, the dimming component 2 includes:

[0060] A first lens 3 and a second lens 4;

[0061] The first lens 3 is used to transmit the third laser 03 and reflect the fourth laser 04;

[0062] The second lens 4 is used to reflect the third laser 03 and transmit the fourth laser 04;

[0063] The dimming component 2 has a first state and a second state;

[0064] refer to Figure 1 , when in the first state, the first lens 3 is at the exit end of the oscillating component 1;

[0065] refer to Figure 2 , when in the second state, the second lens 4 is at the exit end of the oscillation component 1.

[0066] Specifically, the transmitting component 6 and the oscillating component 1 are fixedly installed in the housing of the optical parametric oscillator; and the dimming component 2 is slidably installed in the housing of the optical parametric oscillator.

[0067] In some embodiments, reference Figure 1-3, the direction of emitting laser is the first direction, then the sliding direction of the dimming component 2 is at an angle of 45 degrees to the first direction; and the first lens 3 and the second lens 4 are at an angle of 45 degrees to the first direction.

[0068] In some embodiments, the dimming component 2 can be rotatably mounted in the housing of the optical parametric oscillator, and the state of the dimming component 2 can be switched by rotation. In this case, the first lens 3 and the second lens 4 also need to have a 45 degree angle with the first direction.

[0069] Furthermore, it also includes:

[0070] The first light absorbing device 5 and the oscillating component 1 are respectively located on both sides of the normal of the first lens 3 or the second lens 4, and are used to absorb the fourth laser 04 reflected by the first lens 3 or the third laser 03 reflected by the second lens 4.

[0071] Specifically, when the dimming component 2 is in the first state, the oscillating component 1 and the first light absorbing device 5 are on both sides of the normal line of the first lens 3; when the dimming component 2 is in the second state, the oscillating component 1 and the first light absorbing device are on both sides of the normal line of the second lens 4.

[0072] The fourth laser 04 reflected by the first lens 3 or the third laser 03 reflected by the second lens 4 enters the first light absorbing device 5 after reflection, which can avoid irradiating other parts and causing damage.

[0073] Furthermore, the emitting component 6 is also used to emit a fifth laser 05; the wavelength of the fifth laser 05 is equal to a set multiple of the wavelength of the first laser 01;

[0074] The optical parametric oscillator further includes: a third lens 7 and a fourth lens 8 which are sequentially arranged along the emission direction of the fifth laser 05;

[0075] The dimming component also includes: a fifth lens 9; the dimming component also has a third state, reference Figure 3 , when in the third state, the fifth lens 9 is at the exit end of the oscillating component 1; after the fifth laser 05 is emitted from the emitting component 6, it is transmitted by the third lens 7, reflected by the fourth lens 8 and reflected by the fifth lens 9 and then emitted.

[0076] Specifically, in some cases, the fifth laser 05 needs to be emitted, and in this case, the fifth laser 05 can be directly reflected to the emission end and emitted without passing through the oscillating component 1. The specific optical path is: the emission component 6 emits the fifth laser 05, which is transmitted by the third lens 7, reflected by the fourth lens 8, and then emitted after being reflected by the fifth lens 9.

[0077] In some embodiments, the position where the fifth laser 05 is reflected to the fifth lens 9 is the same as the position where the third laser 03 passes through the first lens 3 and the position where the fourth laser 04 passes through the second lens 4 .

[0078] Also, since the sliding direction of the dimming component 2 and the directions of the first lens 3 and the second lens 4 are all at a 45-degree angle to the first direction, it can be ensured that the third laser 03, the fourth laser 04 and the fifth laser 05 can all be emitted coaxially without causing any deviation in the optical path.

[0079] Furthermore, a second light absorbing device 10 is fixedly mounted on a side of the fifth lens 9 close to the third lens 7;

[0080] When the fifth lens 9 is located between the third lens 7 and the fourth lens 8 and is located on the optical path of the fifth laser 05 , it is used to absorb the fifth laser 05 .

[0081] Specifically, when the dimming component 2 is in the first state and the second state, the second light absorbing device 10 is located between the third lens 7 and the fourth lens 8, and is used to block the optical path of the fifth laser 05 and absorb the fifth laser 05;

[0082] When the dimming component 2 is in the third state, the second light absorbing device 10 is located at the emission end of the oscillating component 1 and no longer blocks the optical path of the fifth laser 05 , and is used to absorb the third laser 03 and the fourth laser 04 .

[0083] Specifically, a second light absorbing device 10 is arranged on the side of the fifth lens 9 close to the oscillating assembly 1 to avoid emitting laser light of a wrong wavelength due to operational errors.

[0084] The specific situation is: the dimming component 2 is in the third state, but the emitting component 6 emits the first laser 01, and the third laser 03 and the fourth laser 04 are obtained after passing through the oscillating component 1. If the second light absorbing device 10 is not provided, the third laser 03 and the fourth laser 04 may be emitted at the same time after passing through the fifth lens 9.

[0085] Furthermore, the transmitting assembly 6 comprises:

[0086] A baseband module 11, wherein the baseband module 11 is used to emit a fifth laser 05;

[0087] A frequency doubling module 12, wherein the frequency doubling module 12 is used to convert the fifth laser 05 into the first laser 01 after receiving the fifth laser 05;

[0088] The frequency multiplication module 12 has a fourth state and a fifth state;

[0089] When in the fourth state, the frequency doubling module 12 is in the optical path of the fifth laser 05, and the emitting component 6 emits the first laser 01;

[0090] When in the fifth state, the frequency doubling module 12 is not in the optical path of the fifth laser 05 , and the emitting component 6 emits the fifth laser 05 .

[0091] Furthermore, the transmitting assembly 6 further comprises:

[0092] The tenth lens 13 is disposed between the baseband module 11 and the frequency doubling module 12 , and is used for reflecting the fifth laser 05 emitted by the baseband module 11 to the frequency doubling module 12 .

[0093] In this embodiment, the frequency doubling module 12 is a double frequency doubling module. For example, the wavelength of the fifth laser 05 is 1064 nanometers, and the wavelength of the first laser 01 after conversion is 532 nanometers, so the multiplication factor is set to 2.

[0094] The wavelengths of the third laser 03 and the fourth laser 04 are between 700 and 1000 nanometers.

[0095] Specifically, the present invention sets the frequency doubling module 12 in a movable manner so as to adjust the emission component 6 to emit the first laser 01 or the fifth laser 05. When the fifth laser 05 needs to be emitted, the frequency doubling module 12 is set at a position that is not in the optical path of the fifth laser 05; when the first laser 01 needs to be emitted, the frequency doubling module 12 is in the optical path of the fifth laser 05.

[0096] Furthermore, the oscillating component 1 comprises:

[0097] An eighth lens 18, a crystal 16 and a sixth lens 15 are sequentially arranged along the emission direction of the third laser 03 and the fourth laser 04;

[0098] After the first laser 01 is emitted from the emitting assembly 6, it is reflected by the third lens 7 and the sixth lens 15 successively and then enters the crystal 16; the crystal 16 is used to perform a nonlinear process on the first laser 01 to obtain an output laser;

[0099] The output laser includes: the third laser 03 and the fourth laser 04 ; the third laser 03 and the fourth laser 04 are reflected by the eighth lens 18 , transmitted by the crystal 16 and the sixth lens 15 , and then emitted from the output end of the oscillating component 1 .

[0100] Furthermore, the oscillating component 1 further comprises:

[0101] The ninth lens 19 is arranged on the side of the sixth lens 15 away from the crystal 16, and is used for transmitting only the third laser 03 and the fourth laser 04.

[0102] Specifically, β-barium borate is used for the crystal 16. The nonlinearization process is a characteristic of the crystal 16 itself, and is common knowledge and will not be described in detail here.

[0103] The working principle of the oscillating component 1 includes: receiving the first laser 01, and performing nonlinearization on the first laser 01 to obtain output lasers, including the second laser 02, the third laser 03 and the fourth laser 04. Then, the obtained second laser 02 is reflected back to the transmitting component through the seventh lens 17 and the sixth lens 15, and the third laser 03 and the fourth laser 04 are emitted from the emission end of the oscillating component 1 through the eighth lens 18.

[0104] The third laser 03 and the fourth laser 04 are transmitted and reflected respectively by the dimming component 2, and finally emitted from the emission end of the optical parametric oscillator housing.

[0105] In this embodiment, a stop is also provided at the exit end of the optical parametric oscillator housing ( Figure 1-3 (not shown) can limit the laser spot and make the emitted laser more parallel.

[0106] Specifically, since the ninth lens 19 is provided to transmit only the third laser 03 and the fourth laser 04, it can be ensured that the emitted laser waves can only be the third laser 03 and the fourth laser 04; this method can filter out most of the stray light and make the wavelength of the emitted light more accurate.

[0107] Further, the oscillating assembly 1 further comprises: a seventh lens 17 disposed between the crystal 16 and the eighth lens 18;

[0108] The transmitting assembly 6 further includes a third light absorbing device 14 disposed on a side of the tenth lens 13 away from the frequency doubling module 12;

[0109] The output laser further includes: a second laser 02 having a wavelength equal to that of the first laser 01;

[0110] After being emitted from the crystal 16 , the second laser 02 is reflected by the seventh lens 17 , the sixth lens 15 and the third lens 7 in sequence, and then enters the third light absorbing device 14 ; the third light absorbing device 14 is used to absorb the second laser 02 .

[0111] Specifically, all the energy of the first laser 01 is nonlinearly generated by the oscillation component 1 to generate the second laser 02, the third laser 03 and the fourth laser 04. The second laser 02 is the remaining beam of the first laser 01. Although the frequency of the second laser 02 is the same as that of the first laser 01, the energy of the second laser 02 is lower than that of the first laser 01.

[0112] In order to prevent the remaining second laser 02 from being reflected back to the emitting assembly 6 and irradiating other parts to cause damage, a third light absorbing device 14 is further provided in this embodiment to absorb the remaining second laser 02 .

[0113] Figure 1-3 The arrows in the figure indicate the directions of the lasers.

[0114] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. An optical parametric oscillator with adjustable optical frequency, characterized in that: include: An emitting component (6), the emitting component (6) being used to emit a first laser (01); An oscillating component (1), the oscillating component (1) being used to receive the first laser (01) and perform a nonlinear process on the first laser (01) to obtain a third laser (03) and a fourth laser (04) having different wavelengths; The third laser (03) and the fourth laser (04) are emitted from the emission end of the oscillating component (1); A dimming component (2), the dimming component (2) being arranged at the emission end of the oscillating component (1) and being used for adjusting the emission of the third laser (03) or the emission of the fourth laser (04); The dimming component (2) comprises: A first lens (3) and a second lens (4); The first lens (3) is used to transmit the third laser (03) and reflect the fourth laser (04); The second lens (4) is used to reflect the third laser (03) and transmit the fourth laser (04); The dimming component (2) has a first state and a second state; When in the first state, the first lens (3) is located at the emission end of the oscillating component (1); When in the second state, the second lens (4) is located at the emission end of the oscillating component (1); The emitting component (6) is also used to emit a fifth laser (05); the wavelength of the fifth laser (05) is equal to a set multiple of the wavelength of the first laser (01); The optical parametric oscillator further comprises: a third lens (7) and a fourth lens (8) which are arranged in sequence along the emission direction of the fifth laser (05); The dimming component further comprises: a fifth lens (9); the dimming component also has a third state, and when in the third state, the fifth lens (9) is located at the emission end of the oscillating component (1); after the fifth laser (05) is emitted from the emitting component (6), it is transmitted through the third lens (7), reflected by the fourth lens (8), and reflected by the fifth lens (9), and then emitted.

2. The optical parametric oscillator with adjustable optical frequency according to claim 1, characterized in that: Also includes: A first light absorbing device (5), wherein the first light absorbing device (5) and the oscillating component (1) are respectively located on both sides of the normal line of the first lens (3) or the second lens (4), and are used to absorb the fourth laser (04) reflected by the first lens (3), or the third laser (03) reflected by the second lens (4).

3. The optical parametric oscillator with adjustable optical frequency according to claim 1, characterized in that: A second light absorbing device (10) is also fixedly mounted on a side of the fifth lens (9) close to the third lens (7); When the fifth lens (9) is located between the third lens (7) and the fourth lens (8) and is located on the optical path of the fifth laser (05), it is used to absorb the fifth laser (05).

4. The optical parametric oscillator with adjustable optical frequency according to claim 1, characterized in that: The transmitting assembly (6) comprises: A baseband module (11), the baseband module (11) being used to emit a fifth laser (05); A frequency doubling module (12), the frequency doubling module (12) being used to convert the fifth laser (05) into the first laser (01) after receiving the fifth laser (05); The frequency multiplication module (12) has a fourth state and a fifth state; When in the fourth state, the frequency doubling module (12) is in the optical path of the fifth laser (05), and the emitting component (6) emits the first laser (01); when in the fifth state, the frequency doubling module (12) is not in the optical path of the fifth laser (05), and the emitting component (6) emits the fifth laser (05).

5. The optical parametric oscillator with adjustable optical frequency according to claim 4, characterized in that: The transmitting assembly (6) further comprises: A tenth lens (13), the tenth lens (13) being arranged between the baseband module (11) and the frequency doubling module (12), and being used for reflecting the fifth laser (05) emitted by the baseband module (11) to the frequency doubling module (12).

6. The optical parametric oscillator with adjustable optical frequency according to claim 5, characterized in that: The oscillating component (1) comprises: an eighth lens (18), a crystal (16), and a sixth lens (15) arranged in sequence along the emission direction of the third laser (03) and the fourth laser (04); After being emitted from the emitting component (6), the first laser (01) is reflected by the third lens (7) and the sixth lens (15) successively, and then enters the crystal (16); the crystal (16) is used to perform a nonlinear process on the first laser (01) to obtain an output laser; The output laser comprises: the third laser (03) and the fourth laser (04); the third laser (03) and the fourth laser (04) are reflected by the eighth lens (18), transmitted by the crystal (16) and the sixth lens (15), and then emitted from the output end of the oscillating component (1).

7. The optical parametric oscillator with adjustable optical frequency according to claim 6, characterized in that: The oscillating component (1) further comprises: A ninth lens (19), the ninth lens being arranged on a side of the sixth lens (15) away from the crystal (16), and being used for transmitting only the third laser (03) and the fourth laser (04).

8. The optical parametric oscillator with adjustable optical frequency according to claim 6, characterized in that: The oscillating assembly (1) further comprises: a seventh lens (17) arranged between the crystal (16) and the eighth lens (18); The emitting assembly (6) further comprises a third light absorbing device (14) arranged on a side of the tenth lens (13) away from the frequency doubling module (12); The output laser further comprises: a second laser (02) having a wavelength equal to that of the first laser (01); After being emitted from the crystal (16), the second laser light (02) is reflected by the seventh lens (17), the sixth lens (15) and the third lens (7) in sequence, and then enters the third light absorbing device (14); the third light absorbing device (14) is used to absorb the second laser light (02).

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