CN111934163B - Cascade nonlinear optical frequency conversion device for realizing blue-violet light of 1064nm to 400-450nm - Google Patents
Cascade nonlinear optical frequency conversion device for realizing blue-violet light of 1064nm to 400-450nm Download PDFInfo
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Abstract
The invention discloses a cascade nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light, which belongs to the technical field of laser technology and nonlinear optics, wherein a 1064nm laser resonant cavity is formed by a resonant cavity input mirror and a resonant cavity output mirror; a middle mirror of a resonant cavity is arranged in the 1064nm laser resonant cavity, and a 1064nm laser medium and a Q switch are sequentially arranged between an input mirror of the resonant cavity and the middle mirror of the resonant cavity; nonlinear crystals with different functions are sequentially arranged between the middle mirror of the resonant cavity and the output mirror of the resonant cavity, the 1064nm laser pump OPO crystal generates 1.5 μm wave band laser, and the generation of 400-450nm wave band blue-violet laser is further realized by the combined design of frequency doubling and sum frequency of the 1064nm and 1.5 μm wave band laser in the cavity. The invention adopts an intracavity nonlinear optical frequency conversion mode, thereby improving the conversion efficiency of nonlinear optical frequency conversion; as an OPO crystal, a 1064nm pumping non-critical phase matching structure is realized, and the generation of 1.5 mu m wave band laser with the maximum efficiency is ensured.
Description
Technical Field
The invention relates to the technical field of laser technology and nonlinear optics, in particular to a cascade nonlinear optical frequency conversion device for realizing blue-violet light with wavelength ranging from 1064nm to 400-450 nm.
Background
The solid blue-violet laser with the output wavelength of 400-450nm can be applied to the fields of biological medical treatment, laser processing, laser display, raman spectroscopy and the like. In the field of laser processing, the cutting demand for metals such as gold, silver, copper, aluminum and the like and alloys thereof is increasing day by day for high-reflective materials, and the blue-violet laser is receiving wide attention in the micromachining application scene of nonferrous metals by virtue of excellent light absorption rate, higher resolution and higher processing quality. In the biomedical field, drug-resistant bacterial diseases caused by bacterial infections are constantly occurring, and the threat of drug-resistant bacteria to global public health is not inconstant, and new therapeutic approaches are required to be developed for highly drug-resistant infectious diseases. Blue-violet light of 400-450nm has attracted increasing attention as it has broad-spectrum bactericidal activity without the need for photosensitizers. Most bacteria are sensitive to light radiation of the wave band, and the bacteria can generate a series of physiological changes under the action of blue and violet light, such as killing the bacteria by regulating the activity of the bacteria, inhibiting the formation and the diffusion of a biological film and the like. Research results in the literature [ appl.environ. Microbiol, 2009, 75 (7): 1932-1937] show that 405nm blue-violet light has different levels of bactericidal effects on various gram-positive bacteria (staphylococcus epidermidis, streptococcus pyogenes, enterococcus faecalis) and gram-negative bacteria (acinetobacter baumannii, pseudomonas aeruginosa, enterobacter, proteus vulgaris and klebsiella pneumoniae). Compared with the traditional antibiotic treatment, the treatment scheme of adopting the 400-450nm wave band blue-violet laser can kill or reduce bacteria in the inner layer of the bacterial biomembrane better, and is little influenced by the problem of bacterial drug resistance. And because the laser beam can be accurately localized in the bacterial infection area, other non-infection parts can not be influenced. Compared with ultraviolet laser treatment with shorter wavelength, the blue-violet laser with the wave band can greatly reduce the probability of causing cell DNA mutation and has better biological safety.
The method for realizing 400-450nm blue-violet laser output in a solid laser mainly comprises the following three methods: (1) a semiconductor laser; (2) up-conversion blue-violet lasers; (3) A blue-violet laser based on a nonlinear optical frequency conversion technology. The development of blue semiconductor lasers requires expensive fabrication equipment and substrate materials, while the beam quality of semiconductor lasers is unsatisfactory and limited in many applications. Up-conversion techniques involve complex energy transfer mechanisms, requiring strict selection and optimization of active ions, matrix materials, etc. In the nonlinear optical frequency conversion technique, the conventional scheme is to utilize Nd 3+ The ion 0.9 μm laser obtains blue light output by frequency doubling. However, a 0.9 μm laser corresponds to Nd 3+ Ion(s) 4 F 3/2 — 4 I 9/2 The transition is a quasi-three-level structure, has inherent problems of serious reabsorption loss, small stimulated emission cross section and the like, and the key of the frequency doubling scheme is to adopt proper measures to inhibit the oscillation of 1.06 mu m with large emission cross section. In addition Nd 3+ Ion(s) 4 F 3/2 — 4 I 9/2 The transition wavelength is above 900nm, and the direct frequency doubling scheme cannot realize the output of shorter blue-violet wavelength. Using Cr 3+ :LiSAF、Ti 3+ Sapphire medium with wide fluorescence spectrum characteristic of 800-1000nm, blue-violet light output of 400-450nm can be obtained by intracavity frequency doubling, but doped with Cr 3+ Doped with Ti 3+ The laser needs a laser pump in a visible light wave band, and the overall cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cascade nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light, and the device has the advantages of high light conversion efficiency, long service life of nonlinear crystal, easy production, compact structure and low cost.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a cascade nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light, which comprises a resonant cavity input mirror and a resonant cavity output mirror, wherein the resonant cavity input mirror and the resonant cavity output mirror form a 1064nm laser resonant cavity; a middle mirror of a resonant cavity is placed in the 1064nm laser resonant cavity, and a 1064nm laser medium and a Q switch are sequentially placed between an input mirror of the resonant cavity and the middle mirror of the resonant cavity; an OPO crystal, a first nonlinear crystal and a second nonlinear crystal are sequentially arranged between the middle mirror of the resonant cavity and the output mirror of the resonant cavity; wherein, the first and the second end of the pipe are connected with each other,
1064 The laser medium with nm wavelength generates laser with 1064nm after Q-switched, the laser with 1064nm acts on the OPO crystal through the intermediate mirror to generate laser with 1.5 μm wavelength, the generated laser with 1.5 μm wavelength and the laser medium with 1064nm wavelength are simultaneously injected into the first nonlinear crystal and the second nonlinear crystal to carry out frequency doubling and sum frequency, the laser with 400-450nm wavelength is generated, and the generated laser with 400-450nm wavelength is output out of the laser resonant cavity through the output mirror of the resonant cavity.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with wavelength ranging from 1064nm to 400-450nm, the mode of laser output with wavelength ranging from 400nm is as follows: the first nonlinear crystal realizes 1064nm frequency doubling to generate 532nm band laser, and the second nonlinear crystal realizes frequency summation of 532nm and 1.5 μm band laser to obtain 400nm band laser output.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with the wavelength of 1064nm to 400-450nm, the first nonlinear crystal is KTA, and the second nonlinear crystal is LBO or KDP.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with wavelength ranging from 1064nm to 400-450nm, the mode of outputting the laser with the wavelength ranging from 450nm is as follows: the first nonlinear crystal realizes frequency doubling of 1.5 mu m wave band laser to generate 0.75 mu m wave band laser, and the second nonlinear crystal realizes sum frequency of 0.75 mu m wave band laser and 1064nm laser to obtain 450nm wave band laser output.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with wavelength ranging from 1064nm to 400-450nm, the mode of laser output with wavelength ranging from 400nm is as follows: the first nonlinear crystal realizes the sum frequency of laser with wave bands of 1064nm and 1.5 μm to generate laser with wave band of 0.6 μm, and the second nonlinear crystal realizes the sum frequency of laser with wave band of 0.6 μm and 1064nm to obtain laser output with wave band of 400 nm.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with wavelength ranging from 1064nm to 400-450nm, the mode of outputting the laser with the wavelength ranging from 450nm is as follows: the first nonlinear crystal realizes the sum frequency of 1064nm and 1.5 μm band laser to generate 0.6 μm band laser, and the second nonlinear crystal realizes the sum frequency of 0.6 μm and 1.5 μm band laser to obtain 450nm band laser output.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with the wavelength ranging from 1064nm to 400-450nm, the 1064nm laser medium, the Q-switch, the middle mirror of the resonant cavity, the OPO crystal, the first nonlinear crystal and the second nonlinear crystal are all arranged in the 1064nm laser resonant cavity.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with the wavelength of 1064nm to 400-450nm, the 1064nm laser medium is Nd: YAG crystal, ceramic, nd: YVO 4 Any one of the solid laser media is pumped by a semiconductor laser diode side face pump or a diode end face longitudinal pump or a krypton lamp and xenon lamp side face pump.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with the wavelength ranging from 1064nm to 400-450nm, the OPO crystal is an X-axis cutting KTA crystal or an X-axis cutting KTP crystal.
As a further optimization scheme of the cascade nonlinear optical frequency conversion device for realizing the blue-violet light with the wavelength ranging from 1064nm to 400-450nm, the Q switch is an acousto-optic switch, an electro-optic switch or a saturated absorption type passive Q switch.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) The invention adopts an intracavity nonlinear optical frequency conversion mode, fully utilizes the characteristics of high laser power density and good light beam quality in the cavity and can improve the conversion efficiency of nonlinear optical frequency conversion;
(2) The 1064nm fundamental frequency laser generated by utilizing the 1064nm laser medium with lower price and mature technology has the advantages of compact structure, low cost and the like;
(3) An X-axis cutting KTA crystal or an X-axis cutting KTP crystal is skillfully selected, a 1064nm pumping non-critical phase matching structure can be realized, and the generation of 1.5 mu m wave band laser with the maximum efficiency is ensured; the generation of blue-violet laser with 400-450nm wave band is realized by ingenious combined design of frequency doubling and sum frequency of 1064nm and 1.5 mu m wave band laser in the cavity.
Drawings
FIG. 1 is a schematic structural diagram of a cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light.
FIG. 2 is a schematic diagram of the principle of four solutions; wherein, (a) is a schematic diagram of a scheme 1, (b) is a schematic diagram of a scheme 2, and (c) is a schematic diagram of a scheme 3, and (d) is a schematic diagram of a scheme 4.
FIG. 3 is a schematic diagram of an exemplary device.
The reference numerals in the drawings are to be interpreted: 1-resonator input mirror, 2-1064nm laser medium, 3-Q switch, 4-resonator intermediate mirror, 5-OPO crystal, 6-first nonlinear crystal, 7-second nonlinear crystal, 8-resonator output mirror, S1-resonator input mirror rear mirror, S2-resonator intermediate mirror front mirror, S3-resonator intermediate mirror rear mirror, S4-resonator output mirror front mirror, S5-resonator output mirror rear mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light comprises a resonant cavity input mirror 1, a 1064nm laser medium 2, a Q-switch 3, a resonant cavity intermediate mirror 4, an OPO crystal 5, a first nonlinear crystal 6, a second nonlinear crystal 7 and a resonant cavity output mirror 8.
The cavity input mirror 1 and the cavity output mirror 8 form a 1064nm laser cavity, which provides a cavity required for 1064nm oscillation. The middle mirror 4 of the resonant cavity is arranged in the resonant cavity, and the middle mirror and the output mirror 8 of the resonant cavity form a nonlinear optical variable frequency resonant cavity, so that the functions of OPO, frequency doubling and frequency combination are realized. A1064 nm laser medium 2 and a Q-switch 3 are sequentially arranged between the resonant cavity input mirror 1 and the resonant cavity intermediate mirror 4, and an OPO4 crystal 5, a first nonlinear crystal 6 and a second nonlinear crystal 7 are sequentially arranged between the resonant cavity intermediate mirror 4 and the resonant cavity output mirror 8. 1064 The nm laser medium 2, the middle mirror 4 of the resonant cavity, the OPO4 crystal 5, the first nonlinear crystal 6 and the second nonlinear crystal 7 are all arranged in the 1064nm laser resonant cavity.
The invention principle is as follows: the 1064nm laser medium generates high-power-density 1064nm laser after being Q-switched, the high-power-density 1064nm laser is acted on an OPO crystal to generate 1.5 mu m wave band OPO signal light, the generated 1.5 mu m wave band laser and the 1064nm high-power-density laser generated by the 1064nm laser medium are simultaneously emitted into a first nonlinear crystal 6 and a second nonlinear crystal 7, and the generation of 400-450nm wave band blue-violet laser is realized by the combined design of frequency doubling and sum frequency of the 1064nm and 1.5 mu m wave band laser in a cavity, and the invention provides four combined schemes, particularly comprising: as shown in fig. 2 (a), in scheme 1, the first nonlinear crystal is a 1064nm frequency doubling crystal, which generates 532nm green light, and the second nonlinear crystal is a sum frequency nonlinear crystal, which realizes sum frequency generation of 532nm and 1.5 μm band lasers; as shown in fig. 2 (b), in the scheme 2, the first nonlinear crystal is a 1.5 μm band laser frequency doubling crystal, which generates 0.75 μm band laser, and the second nonlinear crystal is a sum frequency nonlinear crystal, which realizes sum frequency of 0.75 μm band and 1064nm laser; as shown in fig. 2 (c), in the scheme 3, the first nonlinear crystal is a sum frequency nonlinear crystal, which realizes sum frequency of laser light with a wavelength of 1.5 μm and laser light with a wavelength of 1064nm to generate red light with a wavelength of 0.6 μm, and the second nonlinear crystal is a sum frequency nonlinear crystal, which realizes sum frequency of laser light with a wavelength of 0.6 μm and laser light with a wavelength of 1064 nm; as shown in fig. 2 (d), the first nonlinear crystal in the scheme 4 is a sum frequency nonlinear crystal, which realizes sum frequency of laser light with 1.5 μm waveband and 1064nm to generate red light with 0.6 μm waveband, and the second nonlinear crystal is a sum frequency nonlinear crystal, which realizes sum frequency of laser light with 0.6 μm waveband and 1.5 μm waveband.
The first nonlinear crystal 6 in the scheme 1 realizes 1064nm frequency doubling to generate 532nm green light, and the second nonlinear crystal 7 realizes frequency summation of 532nm and 1.5 mu m wave band laser to obtain 400nm wave band laser output. The effective nonlinear optical coefficient, the walk-off angle and other parameters are comprehensively considered, the first nonlinear crystal 6 is LBO, KTP and the like, and the second nonlinear crystal 7 is LBO, KDP, KTA and the like.
The first nonlinear crystal 6 of the scheme 2 realizes frequency doubling of laser with a wave band of 1.5 mu m to generate laser with a wave band of 0.75 mu m, and the second nonlinear crystal 7 realizes sum frequency of the laser with a wave band of 0.75 mu m and the laser with a wave band of 1064nm to obtain laser output with a wave band of 450 nm. The parameters such as effective nonlinear optical coefficient, walk-off angle and the like are comprehensively considered, the first nonlinear crystal 6 is LBO and the like, and the second nonlinear crystal 7 is LBO and the like.
The first nonlinear crystal 6 of the scheme 3 realizes sum frequency of laser with wave bands of 1064nm and 1.5 μm to generate laser with wave band of 0.6 μm, and the second nonlinear crystal 7 realizes sum frequency of laser with wave bands of 0.6 μm and 1064nm to obtain laser output with wave band of 400 nm. The effective nonlinear optical coefficient, the walk-off angle and other parameters are comprehensively considered, the first nonlinear crystal 6 is KTA and the like, and the second nonlinear crystal 7 is LBO, KDP and the like.
The first nonlinear crystal 6 of the scheme 4 realizes sum frequency of laser with wave bands of 1064nm and 1.5 μm to generate laser with wave band of 0.6 μm, and the second nonlinear crystal 7 realizes sum frequency of laser with wave band of 0.6 μm and laser with wave band of 1.5 μm to obtain laser output with wave band of 450 nm. The parameters such as effective nonlinear optical coefficient, walk-off angle and the like are comprehensively considered, the first nonlinear crystal 6 is KTA and the like, and the second nonlinear crystal 7 is LBO and the like.
1064 The nm laser medium 2 is Nd: YAG crystal or ceramic or Nd: YVO 4 And waiting for the solid laser medium, and performing side pumping through a semiconductor laser diode, or longitudinal pumping through a diode end face, or side pumping through a krypton lamp or a xenon lamp.
The OPO crystal 5 is an X-axis cutting KTA crystal or an X-axis cutting KTP crystal.
The Q switch 3 is an acousto-optic switch, an electro-optic switch or a saturation absorption type passive Q switch.
The resonator input mirror 1 acts as a high reflectivity for the 1064nm fundamental frequency wave. The function of the intermediate mirror 4 is to have high transmittance to 1064nm, and simultaneously have high reflectivity to 1.5 μm wave band laser, related frequency doubling or sum frequency wave band and 400-450nm wave band. The resonant cavity output mirror 8 has the functions of high reflectivity for 1064nm fundamental frequency wave, 1.5 μm waveband laser and related frequency doubling or frequency combination waveband, and high transmissivity for 400-450nm waveband laser, thereby realizing the output of 450-450nm waveband laser.
When an X-axis cutting KTA crystal is selected, the X-axis cutting KTA crystal is used as an OPO crystal, a 1064nm pumping non-critical phase matching structure is realized, and 1534nm laser with the maximum efficiency is ensured to be generated.
When the KTP crystal is cut by the X axis, the OPO crystal can be used as an OPO crystal, a 1064nm pumping non-critical phase matching structure can be realized, and 1572nm laser with the maximum efficiency is guaranteed to be generated.
Example 1
As shown in fig. 3, the first nonlinear crystal 6 is a 532 frequency doubling crystal, the second nonlinear crystal 7 is a 400nm sum frequency crystal, and the scheme 1 includes that an OPO crystal 5 (1.5 μm band laser generation), a 532 frequency doubling crystal (1064 nm frequency doubling generation 532nm green light), and a 400nm sum frequency crystal (532 nm and 1.5 μm band laser generation sum frequency) are sequentially disposed between a resonator input mirror 1, a 1064nm laser medium 2, a Q switch 3, a resonator intermediate mirror 4, and a resonator output mirror 8.
When the OPO crystal 5 is an X-axis cutting KTP crystal, the wavelength of a signal light of a non-critical phase matching OPO under a 1064nm pump is 1572nm, and the wavelength of a finally output blue-violet light is 397nm. At this time, the 532 frequency doubling crystals can select (theta =90 degrees, phi =23.5 degrees) cut KTP crystals or (theta =90 degrees, phi =11.3 degrees) cut LBO crystals. The sum frequency crystal of 400nm can be selected from a KTA crystal cut (theta =90 degrees, phi =33.3 degrees) or an LBO crystal cut (theta =90 degrees, phi =23.2 degrees). The coating condition of the resonant cavity input mirror 1 is as follows: the S1 surface HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, the HR @397, 532&1572nm. The coating condition of the resonant cavity output mirror 8 is as follows: the S4 face AR @ 39anm, the S5 face HT @ 39anm, the HR @532, 1064 and 1572nm.
When the OPO crystal 5 is an X-axis cutting KTA crystal, the wavelength of a signal light of a non-critical phase matching OPO under 1064nm pumping is 1534nm, and the wavelength of a finally output blue-violet light is 395nm. At this time, the 532 frequency doubling crystals can select KTP (theta =90 degrees, phi =23.5 degrees) cut crystals or LBO (theta =90 degrees, phi =11.3 degrees) cut crystals. The 400nm sum frequency crystal can select a KTA crystal cut (theta =90 degrees, and phi =45.1 degrees) or an LBO crystal cut (theta =90 degrees, and phi =23.9 degrees). The coating condition of the resonant cavity input mirror S1 is HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, HR @395 and 532&1534nm. The coating condition of the resonant cavity output mirror 8 is as follows: HT @395nm on the S4 surface, HR @532, 1064&1534nm, and AR @395nm on the S5 surface.
Example 2
As shown in fig. 3, the first nonlinear crystal 6 is a frequency doubling crystal with a wavelength band of 0.75 μm, the second nonlinear crystal 7 is a sum frequency crystal with a wavelength of 450nm, and the scheme 2 includes a resonant cavity input mirror 1, a laser medium 2 with a wavelength of 1064nm, a Q-switch 3, an OPO crystal 5 (generated by laser with a wavelength band of 1.5 μm), a frequency doubling crystal with a wavelength band of 0.75 μm (generated by frequency doubling with a wavelength band of 1.5 μm) and a sum frequency crystal with a wavelength of 450nm (generated by laser with a wavelength band of 0.75 μm and a wavelength of 1064 nm) are sequentially placed between a resonant cavity intermediate mirror 4 and a resonant cavity output mirror 8.
When the OPO crystal 5 is an X-axis cutting KTP crystal, the wavelength of a signal light of a non-critical phase matching OPO under a 1064nm pump is 1572nm, and the wavelength of a finally output blue-violet light is 452nm. At this time, the 0.75 μm band frequency doubling crystal can select (θ =90 °, Φ =10.5 °) cut LBO crystal. 450nm sum frequency crystal can be selected from (theta =90 degrees, phi =21.8 degrees) cut LBO crystal. The coating condition of the resonant cavity input mirror 1 is as follows: HR @1064nm on the S1 side. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, HR @452, 786&1572nm. The coating condition of the resonator output mirror 8 is as follows: HT @452nm on the S4 surface, HR @786, 1064&1572nm, and AR @452nm on the S5 surface.
When the OPO crystal 5 is an X-axis cutting KTA crystal, the wavelength of a signal light of a non-critical phase matching OPO under 1064nm pumping is 1534nm, and the wavelength of a finally output blue-violet light is 446nm. At this time, the 0.75 μm band frequency doubling crystal can select (θ =90 °, Φ =8.7 °) cut LBO crystal. 450nm sum frequency crystal can be selected (theta =90 deg., phi =22.6 deg.) cut LBO crystal. The coating condition of the resonant cavity input mirror 1 is as follows: the S1 surface HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, the HR @446, 767&1572nm. The coating condition of the resonant cavity output mirror 8 is as follows: HT @446nm on S4 surface, HR @767, 1064&1572nm and AR @446nm on S5 surface.
As shown in fig. 3, the first nonlinear crystal 6 is a 0.6 μm band sum frequency crystal, the second nonlinear crystal 7 is a 400nm sum frequency crystal, and the scheme 3 includes a resonator input mirror 1, a 1064nm laser medium 2, a Q-switch 3, an OPO crystal 5 (1.5 μm band laser generated), a 0.6 μm band sum frequency crystal (1.5 μm band sum frequency and 1064nm sum frequency generate 0.6 μm band laser), and a 400nm sum frequency crystal (0.6 μm band sum frequency and 1064nm laser generated sum frequency) placed in sequence between the resonator intermediate mirror 4 and the resonator output mirror 8.
When the OPO crystal 5 is an X-axis cutting KTP crystal, the wavelength of a signal light of a non-critical phase matching OPO under a 1064nm pump is 1572nm, and the wavelength of a finally output blue-violet light is 395nm. At this time, the 0.6 μm band sum frequency crystal can select a KTA crystal cut (θ =90 °, Φ =20 °) or an LBO crystal cut (θ =19.7 °, Φ =0 °). And a 400nm sum frequency crystal can be selected from LBO crystals cut by (theta =90 degrees, and phi =29.9 degrees). The coating condition of the resonant cavity input mirror 1 is as follows: the S1 surface HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, the HR @397, the 634 and 1572nm. The coating condition of the resonant cavity output mirror 8 is as follows: the S4 face HT @ 393972 nm, HR @634, 1064&1572nm and the S5 face AR @ 3972 nm.
When the OPO crystal 5 is an X-axis cutting KTA crystal, the wavelength of a signal light of a non-critical phase matching OPO under a 1064nm pump is 1534nm, and the wavelength of a finally output blue-violet light is 395nm. The 0.6 μm band and frequency crystals can then be selected from (theta =90 deg., phi =23.5 deg.) cut KTA crystals or (theta =19.2 deg., phi =0 deg.) cut LBO crystals. 400nm sum frequency crystal can be selected from (theta =90 deg., phi =30.2 deg.) cut LBO crystal. The coating condition of the resonant cavity input mirror 1 is as follows: the S1 surface HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, HR @395 and 628&1534nm. The coating condition of the resonant cavity output mirror 8 is as follows: HT @395nm on the S4 surface, HR @628, 1064&1534nm, and AR @ 3972 nm on the S5 surface.
Example 4
As shown in FIG. 3, the first nonlinear crystal 6 is a 0.6 μm band sum frequency crystal, the second nonlinear crystal 7 is a 450nm sum frequency crystal, and the scheme 4 comprises a resonator input mirror 1, a 1064nm laser medium 2, a Q-switch 3, a resonator intermediate mirror 4 and a resonator output mirror 8, wherein an OPO crystal 5 (1.5 μm band laser generated), a 0.6 μm band sum frequency crystal (1.5 μm band and 1064nm sum frequency generate 0.6 μm band laser), and a 450nm sum frequency crystal (0.6 μm band and 1.5 μm band laser generated sum frequency) are sequentially arranged between the resonator input mirror 1 and the resonator output mirror 8.
When the OPO crystal 5 is an X-axis cutting KTP crystal, the wavelength of a signal light of a non-critical phase matching OPO under a 1064nm pump is 1572nm, and the wavelength of a finally output blue-violet light is 452nm. At this time, the 0.6 μm band sum frequency crystal can select a KTA crystal cut (θ =90 °, Φ =20 °) or an LBO crystal cut (θ =19.7 °, Φ =0 °). 450nm sum frequency crystal can be selected from (theta =90 degrees, phi =17.1 degrees) cut LBO crystal. The coating condition of the resonant cavity input mirror 1 is as follows: the S1 surface HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, the HR @452, 634&1572nm. The coating condition of the resonator output mirror 8 is as follows: HT @452nm on S4 surface, HR @634, 1064&1572nm, and AR @452nm on S5 surface.
When the OPO crystal 5 is an X-axis cutting KTA crystal, the wavelength of a signal light of a non-critical phase matching OPO under 1064nm pumping is 1534nm, and the wavelength of a finally output blue-violet light is 446nm. At this time, the 0.6 μm band sum frequency crystal can select a (θ =90 °, Φ =23.5 °) cut KTA crystal or a (θ =19.2 °, Φ =0 °) cut LBO crystal. 450nm sum frequency crystal can be selected from LBO crystal cut (theta =90 degrees, phi =18.1 degrees). The coating condition of the resonant cavity input mirror 1 is as follows: the S1 surface HR @1064nm. The coating condition of the resonant cavity intermediate mirror 4 is as follows: the S2 surface AR @1064nm, the S3 surface HT @1064nm, the HR @446, 628 and 1534nm. The coating condition of the resonator output mirror 8 is as follows: HT @446nm on the S4 surface, HR @628 and 1064&1534nm, and AR @446nm on the S5 surface.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A cascade nonlinear optical frequency conversion device for realizing blue-violet light of 1064nm to 400-450nm is characterized by comprising a resonant cavity input mirror and a resonant cavity output mirror, wherein the resonant cavity input mirror and the resonant cavity output mirror form a 1064nm laser resonant cavity; a middle mirror of a resonant cavity is placed in the 1064nm laser resonant cavity, and a 1064nm laser medium and a Q switch are sequentially placed between an input mirror of the resonant cavity and the middle mirror of the resonant cavity; an OPO crystal, a first nonlinear crystal and a second nonlinear crystal are sequentially arranged between the middle mirror of the resonant cavity and the output mirror of the resonant cavity; wherein the content of the first and second substances,
the 1064nm laser medium generates 1064nm laser after Q-switched by a Q switch, the 1064nm laser acts on the OPO crystal through an intermediate mirror to generate 1.5 mu m wave band laser, the generated 1.5 mu m wave band laser and the 1064nm laser generated by the laser medium are simultaneously injected into the first nonlinear crystal and the second nonlinear crystal for frequency doubling and sum frequency, 400-450nm wave band laser is generated, and the generated 400-450nm wave band laser is output out of the laser resonant cavity through a resonant cavity output mirror;
the output mode of the 400nm wave band laser is as follows: the first nonlinear crystal realizes 1064nm frequency doubling to generate 532nm band laser, and the second nonlinear crystal realizes sum frequency of 532nm and 1.5 μm band laser to obtain 400nm band laser output.
2. The device of claim 1, wherein the first nonlinear crystal is KTA and the second nonlinear crystal is LBO or KDP.
3. The device of claim 1, wherein the 1064nm laser medium, the Q-switch, the resonator mirrors, the OPO crystal, the first nonlinear crystal, and the second nonlinear crystal are all disposed in a 1064nm laser resonator.
4. The device of claim 1, wherein the 1064nm laser medium is N, the device is a cascaded nonlinear optical frequency converter for realizing blue-violet light with wavelength ranging from 1064nm to 400-450nmd is YAG crystal, ceramic, nd is YVO 4 Any one of the solid laser media is pumped by a semiconductor laser diode side face pump or a diode end face longitudinal pump or a krypton lamp and xenon lamp side face pump.
5. The device of claim 1, wherein said OPO crystal is an X-axis cut KTA crystal or an X-axis cut KTP crystal.
6. The device according to claim 1, wherein the Q-switch is an acousto-optic switch, an electro-optic switch or a saturable absorption passive Q-switch.
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