CN205303940U - Full solid laser of 558nm wavelength single -frequency output - Google Patents
Full solid laser of 558nm wavelength single -frequency output Download PDFInfo
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- CN205303940U CN205303940U CN201521078055.0U CN201521078055U CN205303940U CN 205303940 U CN205303940 U CN 205303940U CN 201521078055 U CN201521078055 U CN 201521078055U CN 205303940 U CN205303940 U CN 205303940U
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Abstract
The utility model discloses a full solid laser of 558nm wavelength single -frequency output, including a pumping source system, the pumping source system includes laser diode LD, optic fibre and the focus coupling lens system that settles in proper order in the light path, a Z type resonant cavity device, Z type resonant cavity device includes tail mirror, concave surface refrative mirror, gold -tinted outgoing mirror and the mirror of settling in proper order that is all -trans in the Z die cavity, wave plate and laser gain medium - have been placed between tail mirror and concave surface are folding, the birefringence filter plate has been placed between concave surface refrative mirror and the gold -tinted outgoing mirror, gold -tinted outgoing mirror and be all -trans and placed the second harmonic generation crystal between the mirror. The utility model discloses make full use of the high power density of intracavity base frequency light to adopt the Z die cavity to improve doubling of frequency efficiency, has realized the gold -tinted laser output of single longitudinal mode, low noise, high power and high -energy, successful solution among the prior art shortcoming of laser instrument.
Description
Technical field
This utility model belongs in laser technology field, a kind of total solids single-frequency Yellow light laser being obtained the output of 558nm wavelength by intracavity frequency doubling method related to.
Background technology
Existing laser has the features such as monochromaticity, collimation and high brightness, and have a wide range of applications field. Especially, the laser of yellow band has important application at medical field, and in diagnosis, yellow laser is the ideal chose of the burnt micro-scanning system of inner total reflection fluoroscopic imaging systems or flow cytometer or copolymerization; In medical treatment, tinea erythema nevus or the disease such as blood capillary or fundus flavimaculatus pathological changes can effectively be treated by yellow laser.
Conventional yellow laser instrument has the laser instrument such as Kr ion laser (568nm), dye laser (577nm), copper vapor laser (578nm), but these laser instrument all exist intrinsic shortcoming. Kr ion laser and copper vapor laser broadly fall into gas laser, and its volume is all very big, and power consumption is also very big; Dye laser is liquid laser, and the toxicity of its dyestuff is harmful, is insufficient for instrument instructions for use. Along with progress and the commercialization of semiconductor laser are ripe gradually, optical pumping semiconductor laser and semiconductor pumped Solid State Laser its obtain and develop rapidly, there is good beam quality, volume is little and the advantage such as life-span length. But optical pumping quasiconductor Huang laser wavelength compares limitation at present, semiconductor pumped solid state laser then makes yellow medium wave broader in conjunction with nonlinear frequency transformation technology.
At present, the report of semiconductor pumped solid Huang laser instrument it has been related to both at home and abroad. They mainly take following four mode: one is based on the vibration of double-basis spectrum line obtains (Intracavitysum-frequencydiodeside-pumpedall-solid-stateg enerationyellowlaserat589nmwithanoutputpowerof20.5W by non-linear and frequency, " AppliedOptics ", Vol.52,2013,1876-1880), this method has structure complexity, and volume is big, the shortcomings such as efficiency is low, and noise is big.Two are based on stimulated Raman scattering obtains the stokes light about 1.1��1.2 mu m wavebands, (Self-frequency-doubledBaTeMo2O9Ramanlaseremittingat589nm is obtained again through frequency doubling technology, " OpticsExpress ", Vol.21,2013,7821-7827); Three are based on the stokes light of stimulated Raman scattering passes through with fundamental frequency light and frequency converter technique acquisition (HighpowerQ-switchedintracavitysum-frequencygenerationand self-Ramanlaserat559nm, " Optics&LaserTechnology ", 2013, Vol.47,2013,43-46), but Ramar laser threshold value is high, and light light efficiency is low. The four fundamental frequency spectral lines being based on 1.1��1.2 mu m wavebands directly obtain (Afrequency-doubledNd:YAG/KTPlaserat561nmwithdiodeside-pu mping by frequency doubling technology, " LaserPhys ", Vol.23,2013,5402-5405), this method simple in construction, but single pulse energy and mean power are relatively low, can not obtain single-frequency output. The yellow wavelengths of 558nm more connects closely human eye sensitivity's wavelength 555, and is more suitable for retina solidification operation, treatment ophthalmology degeneration of macula operation than other wavelength. But the wavelength of 558nm seldom arrives very much, this utility model provides the technology of a kind of intracavity frequency doubling to obtain 558nm wavelength laser.
Utility model content
Utility model purpose: the single-frequency in order to obtain 558nm wavelength exports, and this utility model provides a kind of simple in construction, and volume is little, and efficiency is high, the total solids Huang laser instrument of low noise, and this laser instrument can obtain the output of 558nm single-frequency laser.
Technical scheme: all solid laser of a kind of 558nm wavelength single-frequency output that this utility model provides, including:
One pumping source system, described pumping source system includes the laser diode LD, optical fiber and the focusing coupled lens system that dispose successively in light path;
One Z-type resonator device, described Z-type resonator device includes the tail mirror, concave surface refrative mirror, gold-tinted outgoing mirror and the total reflective mirror that dispose successively at Z-type intracavity, described tail mirror and concave surface are placed with wave plate and gain medium between folding, it is placed with birefringent filter between described concave surface refrative mirror and gold-tinted outgoing mirror, between described gold-tinted outgoing mirror and total reflective mirror, is placed with frequency-doubling crystal.
Described wave plate includes being sequentially placed the first plectrum before and after gain medium and the second plectrum, and described first plectrum and the second plectrum are quarter-wave plate.
Described tail mirror, the first wave plate, gain medium, the second wave plate, birefringent filter, concave surface refrative mirror form Z-type chamber the first arm; Described concave surface refrative mirror, gold-tinted outgoing mirror form Z-type chamber the second arm; Described gold-tinted outgoing mirror, frequency-doubling crystal, total reflective mirror form Z-type chamber the 3rd arm.
The length of described Z-type chamber the first arm is 135��145mm, and the length of Z-type chamber the second arm is 123��133mm, and the length of Z-type chamber the 3rd arm is 91��101mm.
Described first wave plate and the second wave plate is all two-sided is coated with anti-reflection film, its fast axle is mutually perpendicular to, and all with birefringent filter be polarized 60 �� of angles, 30 �� of direction.
Described gain medium adopts single-ended composite growth type Nd:YAG crystal or both-end composite growth type Nd:YAG crystal.
Described gain medium and frequency-doubling crystal are all carried out temperature control by refrigerating plant.
Described refrigerating plant is circulating water refrigerating plant, gain medium and frequency-doubling crystal is positioned over by having in the radiator of cooling circulating water, and heat is conducted to recirculated water by radiator, is carried away by heat again through recirculated water.
Described tail mirror is plane mirror, and its surface is coated with anti-reflection film.
Described birefringent filter adopts quartz glass, and with Brewster's angle 56 �� placement, its surface is coated with anti-reflection film.
Described frequency-doubling crystal adopts three Lithium biborates or potassium titanium oxide phosphate.
Operation principle: all solid laser workflow of 558nm wavelength single-frequency of the present utility model output is as follows: the pump light that laser diode LD sends is through fiber-optic transfer, and focus on by focusing on coupled lens system shaping, enter in gain medium, gain medium passes through stimulated emission, producing centre wavelength is the photon of 1116nm, the photon produced is amplified by the feedback of described gain medium and Z-type resonator device, produce the 1116nm fundamental frequency light standing wave of high power density, eliminate the fundamental frequency light standing wave effects of spatial at intracavity by quarter-wave plate and birefringent filter simultaneously, obtain single-frequency operation, then the single-frequency fundamental frequency photon round trip frequency multiplication by frequency-doubling crystal, form 558nm gold-tinted laser and exported by described gold-tinted outgoing mirror.
Beneficial effect: this utility model have employed both-end composite growth type Nd:YAG crystal as gain media, and devise the Z-type meeting the insensitive basic mode dynamic stability of thermal lensing effect and rock chamber, have employed the mode of intracavity round trip frequency multiplication, it is thus achieved that 558nm wavelength gold-tinted laser single-frequency exports. This utility model takes full advantage of the high power density of intracavity fundamental frequency light, and adopts Z-type chamber to improve shg efficiency, it is achieved that single longitudinal mode, low noise, high power and the output of high-octane gold-tinted laser, successfully solves the shortcoming of laser instrument in prior art. Compared with prior art, the length of each arm and the radius of curvature of each chamber mirror in the Z-type chamber that the total solids single-frequency laser of 558nm wavelength of the present utility model output adopts can be optimized according to different designs and choose, can be implemented in the gain medium in very on a large scale on the one hand and the patterns of change in frequency-doubling crystal is only small, thus being greatly reduced the thermal lensing effect impact for laser activity; Fundamental frequency light hot spot less in frequency-doubling crystal can be realized on the other hand, thus realizing higher shg efficiency. The total solids single-frequency laser of 558nm wavelength of the present utility model output has higher output power/energy, and volume is little, good stability, cost are low, noise is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein: 1 laser diode LD, 2 optical fiber, 3 focus on coupled lens system, 4 tail mirrors, 5 first wave plates, 6 gain mediums, 7 second wave plates, 8 birefringent filters, 9 concave surface refrative mirrors, 10 gold-tinted outgoing mirrors, 11 frequency-doubling crystals, 12 total reflective mirrors, 13 refrigerating plants, 14 pumping source systems, 15 Z-type chamber the first arms, 16 Z-type chamber the second arms, 17 Z-type chamber the 3rd arms.
Detailed description of the invention
Embodiment 1:
As shown in Figure 1, a kind of all solid laser obtaining the output of 558nm wavelength single-frequency, it includes a pumping source system 14, described pumping source system 14 is mainly included in a light path laser diode LD 1, optical fiber 2 and the focusing coupled lens system 3 that dispose successively, the mode of operation of described pumping source system 14 is continuous operation mode, maximum continuous pump power is 50W, and output center wavelength is 808nm.
This utility model also includes a Z-shaped resonator device, and described Z-shaped resonator device includes at Z-shaped chamber the first arm 15, Z-type chamber the second arm 16, Z-type chamber the 3rd arm 17.The tail mirror 4 disposed successively in described Z-shaped chamber the first arm 15, the first wave plate 5, gain medium 6, the second wave plate 7, birefringent filter 8, concave surface refrative mirror 9. Concave surface refrative mirror 9, gold-tinted outgoing mirror 10 is disposed successively in described Z-shaped chamber the second arm 16. Gold-tinted outgoing mirror 10, frequency-doubling crystal 11, total reflective mirror 12 is disposed successively in described Z-type chamber the 3rd arm 17.
Further, gain medium 6 and frequency-doubling crystal 11 are carried out bottom surface heat radiation by refrigerating plant 13. Refrigerating plant 13 is circulating water refrigerating plant, and the side of gain medium 6 and frequency-doubling crystal 11 is individually wrapped in red copper radiator, and bottom installation is heat sink to be connected with cooled plate, is carried away by heat by circulating chilled water.
Preferably, gain medium 6 is both-end composite growth type Nd:YAG crystal, and doping content is 1.0at.%, is of a size of 3 �� 3 �� 10mm3The undoped YAG crystal of each 2mm length in rear and front end, mixing section length is 6mm, it is 808nm that front/rear end is plated with wavelength, 1064nm, the anti-reflection film of the light beam of 1116nm and 1319nm, to the absorbance of 808nm and 1116nm light beam more than 99.8%, the absorbance of 808nm and 1319nm light beam is more than 98%.
Preferably, first wave plate 5 and the two-sided of the second wave plate 7 are all coated with the 808nm anti-reflection film more than 95%, and this film to the reflectance of 1116nm spectral line more than 99.8%, to 1064nm spectral line absorbance more than 70%, its fast axle is mutually perpendicular to, and with birefringent filter 8 be polarized angle at 45 ��, direction.
Preferably, frequency-doubling crystal 11 selects three Lithium biborates (LBO), is of a size of 3 �� 3 �� 10mm3, crystal two ends are coated with the anti-reflection film of 1116nm and 558nm, and absorbance is more than 99.8%; Matching way adopts a class matching tolerance, cutting angle (��, ��) to be (90 ��, 8 ��).
Preferably, birefringent filter 8 selects quartz glass, is positioned over intracavity with Brewster's angle (56 ��), and surface is coated with the anti-reflection film to 1116nm fundamental frequency light, and absorbance is more than 99.8%.
Preferably, tail mirror 4 is plane mirror, and input face is coated with 808nm absorbance more than 95%, to the 1064nm spectral line absorbance film system more than 70%; Output face is also coated with the pump light anti-reflection film more than 95%, and this film to the reflectance of 1116nm spectral line more than 99.8%, to 1064nm spectral line absorbance more than 70%.
The length of each arm in adopted Z-type chamber of the present utility model and the radius of curvature of each chamber mirror can be optimized according to different designs and choose.
Preferably, the radius of curvature of concave surface refrative mirror 9 is 100mm, is coated with the 1116nm spectral line reflectance reflectance coating more than 99.8%, and to 1064nm spectral line and 1320nm spectral line absorbance more than 70%.
Preferably, the radius of curvature of gold-tinted outgoing mirror 10 is 50mm, is coated with the 558nm spectral line absorbance anti-reflection film more than 95%, and to 1116nm spectral line reflectance more than 99.8%, to the absorbance of 1064nm spectral line more than 50%.
Preferably, the radius of curvature of total reflective mirror 12 is 50mm, is coated with the reflectance coating more than 99.8% to 1116nm spectral line and 558nm spectral line reflectance, and to the absorbance of 1064nm spectral line more than 50%.
Preferably, the length of Z-type chamber the first arm 15 be l40mm, Z-type chamber the second arm 16 length be 128mm, the length of Z-type chamber the 3rd arm 17 is 96mm, altogether long 364mm.
Preferably, the core diameter of optical fiber 2 200 ��m, numerical aperture 0.22.
Embodiment 2:
Being substantially the same with embodiment 1, difference is as follows:
(1) gain medium is single-ended composite growth type Nd:YAG crystal, is of a size of 3 �� 3 �� 9mm3Wherein front end is the undoped YAG crystal of 4mm length, doped region length is 5mm, concentration is 1.lat.%, front/rear end is plated with the anti-reflection film to the light beam that wavelength is 808nm, 1064nm, 1116nm and 1319nm, wherein to the absorbance of the light beam of 1116nm and 1064nm more than 99.8%, the absorbance of 808nm and 1319nm light beam is more than 98%.
(2) frequency-doubling crystal 11 selects potassium titanium oxide phosphate (KTP), is of a size of 3 �� 3 �� 8mm3, crystal two ends are coated with the anti-reflection film of 1116nm and 558nm, and absorbance is more than 99.8%; Matching way adopts two class matching tolerance, cutting angle cutting angle (��, ��) to be (62.8 ��, 90 ��).
Claims (11)
1. all solid laser of a 558nm wavelength single-frequency output, it is characterised in that including:
One pumping source system (14), described pumping source system (14) includes the laser diode LD (1), optical fiber (2) and focusing coupled lens system (3) that dispose successively in light path;
One Z-type resonator device, described Z-type resonator device includes the tail mirror (4), concave surface refrative mirror (9), gold-tinted outgoing mirror (10) and the total reflective mirror (12) that dispose successively at Z-type intracavity, wave plate and gain medium (6) it is placed with between described tail mirror (4) and concave surface refrative mirror (9), it is placed with birefringent filter (8) between described concave surface refrative mirror (9) and gold-tinted outgoing mirror (10), between described gold-tinted outgoing mirror (10) and total reflective mirror (12), is placed with frequency-doubling crystal (11).
2. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterized in that, described wave plate includes being sequentially placed the first wave plate (5) before and after gain medium (6) and the second wave plate (7), and described first wave plate (5) and the second wave plate (7) are quarter-wave plate.
3. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterized in that, described tail mirror (4), the first wave plate (5), gain medium (6), the second wave plate (7), birefringent filter (8), concave surface refrative mirror (9) composition Z-type chamber the first arm (15); Described concave surface refrative mirror (9), gold-tinted outgoing mirror (10) composition Z-type chamber the second arm (16); Described gold-tinted outgoing mirror (10), frequency-doubling crystal (11), total reflective mirror (12) composition Z-type chamber the 3rd arm (17).
4. all solid laser of 558nm wavelength single-frequency according to claim 3 output, it is characterized in that, the length in described Z-type chamber the first arm (15) is 135��145mm, the length in Z-type chamber the second arm (16) is 123��133mm, and the length in Z-type chamber the 3rd arm (17) is 91��101mm.
5. all solid laser of 558nm wavelength single-frequency according to claim 2 output, it is characterized in that, described first wave plate (5) and the second wave plate (7) is all two-sided is coated with anti-reflection film, its fast axle is mutually perpendicular to, and all with birefringent filter (8) be polarized 60 �� of angles, 30 �� of direction.
6. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterised in that described gain medium (6) adopts single-ended composite growth type Nd:YAG crystal or both-end composite growth type Nd:YAG crystal.
7. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterised in that described gain medium (6) and frequency-doubling crystal (11) are all carried out temperature control by refrigerating plant (13).
8. all solid laser of 558nm wavelength single-frequency according to claim 7 output, it is characterized in that, described refrigerating plant (13) is circulating water refrigerating plant, gain medium (6) and frequency-doubling crystal (11) are positioned over by having in the radiator of cooling circulating water, heat is conducted to recirculated water by radiator, is carried away by heat again through recirculated water.
9. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterised in that described tail mirror (4) is plane mirror, and its surface is coated with anti-reflection film.
10. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterised in that described birefringent filter (8) adopts quartz glass, and with Brewster's angle 56 �� placement, its surface is coated with anti-reflection film.
11. all solid laser of 558nm wavelength single-frequency according to claim 1 output, it is characterised in that described frequency-doubling crystal (11) adopts three Lithium biborates or potassium titanium oxide phosphate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105390929A (en) * | 2015-12-22 | 2016-03-09 | 南京先进激光技术研究院 | All-solid-state laser capable of obtaining single-frequency output at wavelength of 558nm |
| CN114284848A (en) * | 2021-12-20 | 2022-04-05 | 中国科学院上海光学精密机械研究所 | Broadband regenerative laser amplification device with adjustable gain spectrum |
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2015
- 2015-12-22 CN CN201521078055.0U patent/CN205303940U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105390929A (en) * | 2015-12-22 | 2016-03-09 | 南京先进激光技术研究院 | All-solid-state laser capable of obtaining single-frequency output at wavelength of 558nm |
| CN114284848A (en) * | 2021-12-20 | 2022-04-05 | 中国科学院上海光学精密机械研究所 | Broadband regenerative laser amplification device with adjustable gain spectrum |
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