CN218123957U - Cascade multi-wavelength tunable laser for laser radar light source - Google Patents
Cascade multi-wavelength tunable laser for laser radar light source Download PDFInfo
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- CN218123957U CN218123957U CN202222661447.6U CN202222661447U CN218123957U CN 218123957 U CN218123957 U CN 218123957U CN 202222661447 U CN202222661447 U CN 202222661447U CN 218123957 U CN218123957 U CN 218123957U
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- blazed grating
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- reflection mirror
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The utility model discloses a cascade multi-wavelength tunable laser used for a laser radar light source, which belongs to the technical field of dye lasers and lasers, and comprises a laser light source, a gain medium, a cylindrical lens and an optical system; the optical system comprises a quartz dye pool, a blazed grating, an output coupling mirror and a total reflection mirror; the gain medium is arranged in the quartz dye pool; the laser light source corresponds to a cylindrical lens, and the cylindrical lens corresponds to a quartz dye cell; the blazed grating comprises a first blazed grating and a second blazed grating, the total reflection mirror comprises a first total reflection mirror and a second total reflection mirror, the first blazed grating corresponds to the first total reflection mirror, and the second blazed grating corresponds to the second total reflection mirror; the output coupling mirror, the quartz dye cell, the first blazed grating and the first total reflection mirror form a first resonant cavity; the output coupling mirror, the quartz dye pool, the first blazed grating, the second blazed grating and the second total reflection mirror form a second resonant cavity.
Description
Technical Field
The utility model belongs to the technical field of dye laser and laser, specifically a cascade multi-wavelength tunable laser for laser radar light source.
Background
The differential absorption laser radar applied to the atmosphere monitoring technology is mainly used for detecting water vapor, ozone, nitrogen oxides, sulfur dioxide and the like in the atmosphere. The differential absorption laser radar generates two wavelengths of laser light simultaneously, the two are very close, and one of the two is on a strong absorption line of atmospheric composition molecules to be detected and has a large absorption cross section; and the other on its corresponding weak absorption line, the absorption cross section is small. Therefore, there is a need for an independently tunable dual/multi-wavelength laser source that can be accurately positioned to a specific, precise detection wavelength based on the type of gas to be detected.
The multi-wavelength tunable laser can achieve independent tuning of each wavelength, and for a liquid laser, the conventional implementation mode is that the multi-wavelength tunable laser is generated in a single liquid dye resonant cavity, sequentially amplified to a required power level, and further combined by light beams to obtain multi-wavelength integral output. This technique makes the laser device complicated. Due to the high collimation sensitivity of combined optics and beam shaping optics, it becomes very difficult to maintain spatial overlap of the component beams of the interaction region over long transmission distances. Therefore, how to realize efficient, fast and accurate wavelength tuning becomes important in the research content of the multi-wavelength laser.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the scheme, the utility model provides a cascade multi-wavelength tunable laser for laser radar light source.
The purpose of the utility model can be realized by the following technical scheme:
a cascade multi-wavelength tunable laser for a laser radar light source comprises a laser light source, a gain medium, a cylindrical lens and an optical system;
the optical system comprises a quartz dye cell, a blazed grating, an output coupling mirror and a total reflection mirror; the gain medium is arranged in the quartz dye pool;
the laser light source corresponds to the cylindrical lens, and the cylindrical lens corresponds to the quartz dye cell;
the blazed grating comprises a first blazed grating and a second blazed grating, the total reflection mirror comprises a first total reflection mirror and a second total reflection mirror, the first blazed grating corresponds to the first total reflection mirror, the second blazed grating corresponds to the second total reflection mirror, and the first blazed grating and the first total reflection mirror are positioned between the second blazed grating and the quartz dye pool;
the output coupling mirror, the quartz dye cell, the first blazed grating and the first all-mirror form a first resonant cavity;
the output coupling mirror, the quartz dye pool, the first blazed grating, the second blazed grating and the second total reflection mirror form a second resonant cavity.
Furthermore, the blazed grating also comprises a third blazed grating, the total reflection mirror also comprises a third total reflection mirror, and the third blazed grating corresponds to the third total reflection mirror; the third blazed grating and the third total reflection mirror are positioned on one side of the second blazed grating, which is far away from the first blazed grating;
the output coupling mirror, the quartz dye pool, the first blazed grating, the second blazed grating, the third blazed grating and the third total reflection mirror form a third resonant cavity.
Furthermore, the blazed grating also comprises a fourth blazed grating which is positioned on one side of the second blazed grating, which is far away from the first blazed grating; the output coupling mirror, the quartz dye pool, the first blazed grating, the second blazed grating and the fourth blazed grating form a fourth resonant cavity.
Further, the fourth blazed grating forms a Littrow angle with the oscillation direction of the laser in the cavity.
Further, the gain medium is a nile red/ethanol solution.
Compared with the prior art, the beneficial effects of the utility model are that: the adopted laser gain medium is a novel organic laser dye Nile red, and the multi-wavelength continuously tunable laser is generated by combining a grazing incidence grating structure by utilizing the excellent solvation color development characteristic and the good laser property of the novel organic laser dye Nile red. Each laser wavelength is individually tuned by using a cascaded grazing incidence grating structure, in combination with each sub-cavity wave. The optical cavity loss is adjusted by changing the grating incidence angle and changing the line width, so that the light intensity control and the gain competitive control can be realized. The number of pairs of blazed gratings and total reflection mirrors can be increased, and more wavelength tunable laser outputs can be obtained; meanwhile, a Littrow structure can be added in the cavity, the tuning range is expanded, and the output efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an optical path according to a first embodiment of the present invention;
fig. 2 is a schematic view of an optical path according to a second embodiment of the present invention;
fig. 3 is a schematic view of an optical path according to a third embodiment of the present invention.
In the figure: 1. a laser light source; 2. a cylindrical lens; 3. a quartz dye cell; 4. a first blazed grating; 5. a first total reflection mirror; 6. a second blazed grating; 7. a second total reflection mirror; 8. an output coupling mirror; 9. a third blazed grating; 10. a third total reflection mirror; 11. a fourth blazed grating.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, a cascaded multi-wavelength tunable laser for a lidar light source includes a laser light source 1, a gain medium, a cylindrical lens 2, and an optical system. The laser source 1 is Nd of the frequency doubling modulation Q of the pulse mode operation: YAG solid laser, for example, has pulse width of 8ns, pulse repetition frequency of 1-10 Hz, pumping energy of 0-100 mJ, and laser output wavelength of 532nm after frequency doubling. The rear side of the linear light spot shaped by the cylindrical lens 2 is incident into the quartz dye cell 3. The cylindrical lens 2 is a quartz lens plated with an antireflection film, and the transmittance in a visible light range exceeds 95 percent; an exemplary focal length is 50mm and the shaped linear spot output has a length of 10mm.
The quartz dye cell 3 contains liquid organic laser dye solution, namely gain medium, which can be nile red/ethanol solution with proper concentration;
illustratively, the material of the quartz dye cell 3 is quartz glass, and the size is 50mm × 50mm × 20mm. One side of the quartz dye pool 3, which receives the pump light, is plated with a dichroic film, wherein T is more than 95% at 532nm, and R is more than 90% in the range of 600-700 nm; the inner surface of the dye cell resonant cavity is plated with an antireflection film, the transmittance T of 400-700 nm in a visible light range is more than 99.5%, and the concentration is set to be 60 mu g/mL.
The quartz dye pool 3, the output coupling mirror 8 and the two pairs of blazed gratings and the full mirror form two groups of resonant cavities, and the two pairs of blazed gratings refer to the first blazed grating 4 and the second blazed grating 6.
The dimension of the blazed grating is 100mm multiplied by 100mm, the blazed wavelength is 500nm, and the grating ruling is 1200/mm. The total reflection mirror is plated with a reflection increasing film, and the reflectivity R is more than 99%.
The first blazed grating 4 corresponds to the first full-reflecting mirror 5, the second blazed grating 6 corresponds to the second full-reflecting mirror 7, and the first blazed grating 4 and the first full-reflecting mirror 5 are positioned between the second blazed grating 6 and the quartz dye pool 3; namely, the combination of the first blazed grating 4 and the first total reflection mirror 5 is positioned between the combination of the second blazed grating 6 and the second total reflection mirror 7 and the quartz dye cell 3;
the first resonant cavity is composed of an output coupling mirror 8, a quartz dye pool 3, a first blazed grating 4 and a first total reflection mirror 5, the second resonant cavity is composed of an output coupling mirror 8, a quartz dye pool 3, a first blazed grating 4, a second blazed grating 6 and a second total reflection mirror 7, and the two resonant cavities can be independently tuned to output laser wavelengths by adjusting the respective total reflection mirrors.
Example two:
as shown in fig. 2, the present embodiment is different from the first embodiment in that: the grating-total reflection mirror pair is composed of three pairs of blazed gratings and total reflection mirrors, and three groups of resonant cavities are formed by a quartz dye pool 3, an output coupling mirror 8, the three pairs of blazed gratings and the total reflection mirrors. The first resonant cavity is composed of an output coupling mirror 8, a quartz dye pool 3, a first blazed grating 4 and a first total reflection mirror 5, the second resonant cavity is composed of an output coupling mirror 8, a quartz dye pool 3, a first blazed grating 4, a second blazed grating 6 and a second total reflection mirror 7, and the third resonant cavity is composed of an output coupling mirror 8, a quartz dye pool 3, a first blazed grating 4, a second blazed grating 6, a third blazed grating 9 and a third total reflection mirror 10. The three groups of resonant cavities can be independently adjusted through the total reflection mirror, and continuous tuning of output three-wavelength laser is achieved.
Example three:
as shown in fig. 3, the difference between the present embodiment and the first and second embodiments is: the mixed grazing incidence type structure is adopted, and three groups of resonant cavities are formed by a quartz dye pool 3, an output coupling mirror 8, two pairs of blazed gratings, a total reflection mirror and one blazed grating. The first resonant cavity and the second resonant cavity are the same as the first resonant cavity and the second resonant cavity in the second embodiment, the fourth resonant cavity is composed of an output coupling mirror 8, a quartz dye cell 3, a first blazed grating 4, a second blazed grating 6 and a fourth blazed grating 11, and the fourth blazed grating 11 forms a Littrow angle with the laser oscillation direction in the cavity. The second blazed grating 6 is far away from one side of the first blazed grating 4; compared with the structure of the second embodiment, the design can greatly improve the tuning range of laser wavelength in the fourth resonant cavity and increase the output power of the fourth resonant cavity on the premise of not influencing the tuning ranges and the output efficiencies of the first resonant cavity and the second resonant cavity. This is mainly due to the characteristics of high output efficiency and wide tuning range of the Littrow structure.
In summary, the present invention utilizes Nd: YAG laser transversely pumps organic laser dye solution, and double/multiple wavelength independently tunable collinear dye laser can be realized in a cascade incidence structure and a mixed glancing incidence type cascade grating structure. The internal loss of the resonant cavity is adjusted by changing the grating incidence angle, so that the output light intensity and gain competition can be regulated and controlled. The method for obtaining the continuously tunable dual/multi-wavelength narrow linewidth laser can provide technical support for a laser radar light source for atmospheric environment detection.
The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.
Claims (5)
1. The cascade multi-wavelength tunable laser for the laser radar light source is characterized by comprising a laser light source (1), a gain medium, a cylindrical lens (2) and an optical system;
the optical system comprises a quartz dye pool (3), a blazed grating, an output coupling mirror (8) and a total reflection mirror; the gain medium is arranged in the quartz dye cell (3);
the laser light source (1) corresponds to the cylindrical lens (2), and the cylindrical lens (2) corresponds to the quartz dye cell (3);
the blazed grating comprises a first blazed grating (4) and a second blazed grating (6), the total reflection mirror comprises a first total reflection mirror (5) and a second total reflection mirror (7), the first blazed grating (4) corresponds to the first total reflection mirror (5), the second blazed grating (6) corresponds to the second total reflection mirror (7), and the first blazed grating (4) and the first total reflection mirror (5) are located between the second blazed grating (6) and the quartz dye pool (3);
the output coupling mirror (8), the quartz dye cell (3), the first blazed grating (4) and the first total reflection mirror (5) form a first resonant cavity;
the output coupling mirror (8), the quartz dye pool (3), the first blazed grating (4), the second blazed grating (6) and the second total reflection mirror (7) form a second resonant cavity.
2. A cascaded multi-wavelength tunable laser for lidar light sources according to claim 1, wherein the blazed grating further comprises a third blazed grating (9), the all-mirror further comprises a third all-mirror (10), the third blazed grating (9) and the third all-mirror (10) correspond; the third blazed grating (9) and the third total reflection mirror (10) are positioned on one side of the second blazed grating (6) far away from the first blazed grating (4);
the output coupling mirror (8), the quartz dye pool (3), the first blazed grating (4), the second blazed grating (6), the third blazed grating (9) and the third total reflection mirror (10) form a third resonant cavity.
3. A cascaded multi-wavelength tunable laser for lidar light sources according to claim 1, characterized in that the blazed grating further comprises a fourth blazed grating (11), the fourth blazed grating (11) being located on the side of the second blazed grating (6) remote from the first blazed grating (4); the output coupling mirror (8), the quartz dye pool (3), the first blazed grating (4), the second blazed grating (6) and the fourth blazed grating (11) form a fourth resonant cavity.
4. A cascaded multi-wavelength tunable laser for lidar light sources according to claim 3, characterized in that the fourth blazed grating (11) makes a Littrow angle with the direction of the intracavity laser oscillation.
5. The cascaded multi-wavelength tunable laser for a lidar light source of claim 1, wherein the gain medium is a nile red/ethanol solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222661447.6U CN218123957U (en) | 2022-10-10 | 2022-10-10 | Cascade multi-wavelength tunable laser for laser radar light source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222661447.6U CN218123957U (en) | 2022-10-10 | 2022-10-10 | Cascade multi-wavelength tunable laser for laser radar light source |
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| CN218123957U true CN218123957U (en) | 2022-12-23 |
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|---|---|---|---|
| CN202222661447.6U Withdrawn - After Issue CN218123957U (en) | 2022-10-10 | 2022-10-10 | Cascade multi-wavelength tunable laser for laser radar light source |
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2022
- 2022-10-10 CN CN202222661447.6U patent/CN218123957U/en not_active Withdrawn - After Issue
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