CN214754662U - Acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser - Google Patents
Acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser Download PDFInfo
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- CN214754662U CN214754662U CN202120920240.9U CN202120920240U CN214754662U CN 214754662 U CN214754662 U CN 214754662U CN 202120920240 U CN202120920240 U CN 202120920240U CN 214754662 U CN214754662 U CN 214754662U
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Abstract
The utility model discloses a reputation transfers Q bonding yttrium vanadate Raman to cascade variable frequency laser with optical parameter oscillation, the pump source of taking coupled system, the total reflection lens of fundamental frequency light, three-section bonding function composite crystal, Q switch, the total reflection lens of optical parameter oscillation chamber, KTA crystal and the output lens that set gradually on the light path, the axial centerline coincidence of the total reflection lens of pump source, fundamental frequency light, three-section bonding function composite crystal, Q switch, the total reflection lens of optical parameter oscillation chamber, KTA crystal and the output lens of taking coupled system, constitute a fundamental frequency light resonant cavity between the total reflection lens of fundamental frequency light and the output lens, constitute an optical parameter oscillation chamber between the total reflection lens of optical parameter oscillation chamber and the output lens. Above-mentioned technical scheme, structural design is reasonable, simple structure, laser conversion efficiency are high, realize high-efficient 1.7 micron wave band laser output and the practicality is good.
Description
Technical Field
The utility model relates to a laser technical field, concretely relates to reputation transfer Q bonding yttrium vanadate Raman cascades frequency conversion laser with optical parametric oscillation.
Background
The light source in the 1.7 micron area can reduce the scattering and absorption of biological tissues and improve the imaging depth in biological imaging; the C-H bond has a strong absorption peak near 1.7 microns, and can be used for sebaceous gland laser surgery and welding of some high-density polymers. The 1.7 micron wave band has important application in the fields of biophotonics, laser medical treatment, spectrum technology, mid-infrared laser generation and the like, and has great research value. However, the 1.7 micron waveband is difficult to be directly realized by a common solid laser, and at present, the laser output power by common frequency conversion is low, and the practicability is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a structural design is reasonable, simple structure, laser conversion efficiency is high, realize that high-efficient 1.7 micron wave band laser output and good acousto-optic modulation Q bonding yttrium vanadate Raman and the cascaded frequency conversion laser of optical parametric oscillation of practicality.
In order to achieve the above purpose, the utility model provides a following technical scheme: the acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade variable frequency laser comprises a pumping source with a coupling system, a fundamental frequency light total reflection lens, a three-section bonded functional composite crystal, a Q switch, an optical parametric oscillation cavity total reflection lens, a KTA crystal and an output lens which are sequentially arranged on an optical path, wherein axial center lines of the pumping source with the coupling system, the fundamental frequency light total reflection lens, the three-section bonded functional composite crystal, the Q switch, the optical parametric oscillation cavity total reflection lens, the KTA crystal and the output lens are overlapped, a fundamental frequency light resonant cavity is formed between the fundamental frequency light total reflection lens and the output lens, and an optical parametric oscillation cavity is formed between the optical parametric oscillation cavity total reflection lens and the output lens.
The utility model discloses further set up to: the three-segment bonding function composite crystal is a three-segment bonding YVO4/Nd YVO4/YVO4 crystal, the middle Nd YVO4 is a self-Raman crystal, and two ends of the Nd YVO4 crystal are bonded with a YVO4 crystal.
The utility model discloses still further set up to: the KTA crystal is a noncritical phase matching cutting KTA crystal.
The utility model discloses still further set up to: the Q switch comprises an acousto-optic Q switch, an electro-optic Q switch and a passive Q-switching crystal.
The utility model discloses still further set up to: the pumping source of the band coupling system is a semiconductor laser with the output wavelength of 808 nm or 880 nm.
The utility model discloses still further set up to: the fundamental frequency light total reflection lens is used for increasing the reflection of 808 nm or 880 nm waveband laser and simultaneously highly reflecting 1.06 and 1.18 micron waveband laser.
The utility model discloses still further set up to: the optical parametric oscillation cavity total reflection lens is used for increasing the reflection of 1.06 micron and 1.18 micron wave band laser and simultaneously highly reflecting 1.7 micron wave band laser.
The utility model discloses still further set up to: the output lens is highly reflective to laser with wave bands of 1.06 micrometers and 1.18 micrometers, is partially transparent to laser with wave bands of 1.7 micrometers, is used for outputting laser with wave bands of 1.7 micrometers, is highly transparent to laser with wave bands of 1.5 micrometers, has a transmittance of more than 50%, and is used for inhibiting laser with wave bands of 1.5 micrometers, which is generated by driving KTA optical parametric oscillation by using 1.06 micrometers as fundamental frequency light.
The utility model discloses still further set up to: the method comprises the steps of pumping three-section bonding function composite crystal by a pumping source with a coupling system to generate fluorescence of a 1.06 micron wave band, forming oscillation laser in a fundamental frequency light resonant cavity consisting of a fundamental frequency light total reflection lens and an output lens, enabling the oscillation laser to have strong peak power through Q-switch light modulation, generating 1.18 micron laser through three-section bonding function composite crystal from Raman, generating laser of a 1.7 micron wave band through parametric oscillation when the laser passes through a KTA crystal, and enabling the laser of the 1.7 micron wave band to oscillate in an optical parametric oscillation cavity consisting of the total reflection lens and the output lens to be strengthened and partially output.
The utility model has the advantages that: compared with the prior art, the utility model discloses the structure sets up more rationally, utilize three-section bonding function composite crystal relatively ordinary from the raman crystal can improve the fuel factor by a wide margin to increase raman gain medium length, raman laser conversion efficiency has effectively been improved, the frequency conversion technology who cascades for near-step and KTA optical parameter oscillation provides probably, KTA optical parameter oscillation adopts non-critical phase matching technique moreover, have and not walk away from the effect, can obtain advantages such as very high optical parameter oscillation conversion efficiency through the effective length that increases the crystal. The laser output device has the advantages of reasonable structural design, simple structure, high laser conversion efficiency, realization of high-efficiency 1.7-micron wave band laser output and good practicability.
The invention is further described with reference to the drawings and the specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a lens transmittance curve according to an embodiment of the present invention;
FIG. 3 shows YVO of the embodiment of the present invention4/Nd:YVO4/YVO4A self-Raman KTA-OPO laser experiment spectrogram;
fig. 4 is a schematic diagram of a laser output wavelength according to an embodiment of the present invention.
Detailed Description
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, the utility model discloses a frequency conversion laser is cascaded in acousto-optic Q-switched bonded yttrium vanadate raman and optical parameter oscillation, including pump source 7, the total reflection lens of fundamental frequency light 1, three-section bonding function composite crystal 2, Q switch 6, the total reflection lens of optical parameter oscillation chamber 3, KTA crystal 4 and output lens 5 that set gradually on the light path, the axial central line coincidence of pump source 7, the total reflection lens of fundamental frequency light 1, three-section bonding function composite crystal 2, Q switch 6, the total reflection lens of optical parameter oscillation chamber 3, KTA crystal 4 and output lens 5 of taking coupling system, constitute a fundamental frequency light resonant cavity between total reflection lens of fundamental frequency light 1 and the output lens 5, constitute an optical parameter oscillation chamber between the total reflection lens of optical parameter oscillation chamber 3 and the output lens 5.
The three-segment bonding function composite crystal 2 is a three-segment bonded YVO4/Nd: YVO4/YVO4 crystal, the middle Nd: YVO4 is a self-Raman crystal, and two ends of the Nd: YVO4 crystal are bonded with a YVO4 crystal.
Preferably, the design of the three-segment bonding function composite crystal 2 determines the final laser output efficiency by comprehensively considering the laser performance and improving the Raman frequency conversion performance from the viewpoint of improving the Raman laser thermal effect. When the three-segment bonding function composite crystal is used, the middle Nd is YVO4 which is a self-Raman crystal and is mainly designed according to the laser performance; the pump input end of the YVO4 crystal is bonded with a section of undoped YVO4 crystal to improve the thermal effect; the other end of the Nd-YVO 4 crystal is bonded with a section of longer undoped crystal to be used as a Raman gain medium to improve the Raman frequency conversion efficiency. The YVO4 crystal bonded at the two ends of the Nd, YVO4 crystal can not only help the heat dissipation of the Nd, YVO4 crystal through heat conduction and improve the heat effect of a Raman device, but also can be used as a Raman gain medium together with the Nd, YVO4 crystal, so that the action length of the Raman gain medium is increased, the Raman frequency conversion efficiency and the output power are effectively improved, and the laser threshold is reduced. And after the crystal is lengthened, the contact area between the crystal and the cooled heat sink is increased, and the cooling effect of the crystal is improved. The improvement of the thermal lens effect can reduce the diffraction loss of fundamental frequency and Raman light and improve the quality of laser beams. Three sections of crystals with different functions are compounded through a diffusion bonding technology: the method comprises the steps of firstly, precisely polishing the end faces of three sections of crystals, then, attaching the crystal end faces together to form optical cement, then, carrying out heat treatment on the crystals to realize mutual diffusion and fusion of interface molecules, and finally forming stable chemical bonds to really combine the crystal end faces into a whole. Therefore, the fundamental frequency light of the system is 1.06 micron waveband laser, which is determined by Nd: YVO4 crystal, and the first-order Stokes light generated by Raman is 1.18 micron waveband laser.
According to Nd: YVO at ordinary times4Laser performance characteristics of crystal, we choose doped Nd3+Concentration of 0.3%, size of 3X 10mm3YVO is4A crystal; is bonded with a segment of 3X 3mm in size at the pump input end3A-cut pure YVO of4YVO because the beam waist position of the pump light is ensured to fall on Nd4On the crystal, the size of the crystal cap cannot be overlong; at the other end, a segment with the size of 3 multiplied by 17mm is bonded3A-cut pure YVO of4The long crystal is selected as far as possible in order to increase the interaction length of the Raman medium. Nd: YVO4Pure YVO bonded at two ends of crystal4The crystal can not only help Nd: YVO by heat conduction4Crystal heat dissipation, improved thermal effect of self-Raman system, and capability of reacting with Nd: YVO4The crystal is used as a Raman gain medium together, so that the action length of the Raman gain medium reaches 30mm, and the Raman conversion efficiency and the output power are effectively improved.
The KTA crystal 4 is a noncritical phase matching cutting KTA crystal.
Preferably, the KTA crystal 4 is a noncritical phase-matching cut KTA crystal (i.e., in the direction of the X-axis of the crystal axis thereof) at a phase matching angle (θ ═ 90 °, Φ ═ 0 °), and has a length of 20 to 30 mm. The wavelength of the signal light generated by its optical parametric oscillation in the laser system of this embodiment is in the 1.7 micron band.
The Q switch 6 comprises an acousto-optic Q switch, an electro-optic Q switch and a passive Q-switching crystal.
The pump source 7 with the coupling system is a semiconductor laser with the output wavelength of 808 nm or 880 nm.
The fundamental frequency light total reflection lens 1 is used for increasing the reflection of laser in 808 nm or 880 nm (specifically, the same adopted pump source outputs laser wavelength) wave bands, and is used for highly reflecting laser in 1.06 and 1.18 micron wave bands.
The optical parametric oscillation cavity total reflection lens 3 is used for increasing the reflection of 1.06 micron and 1.18 micron wave band laser and simultaneously highly reflecting 1.7 micron wave band laser.
The output lens 5 is highly reflective to laser with wave bands of 1.06 micrometers and 1.18 micrometers, is partially transparent to laser with wave bands of 1.7 micrometers, is used for outputting laser with wave bands of 1.7 micrometers, is highly transparent to laser with wave bands of 1.5 micrometers, has a transmittance of more than 50%, and is used for inhibiting laser with wave bands of 1.5 micrometers generated by the parametric oscillation of the KTA driven by the 1.06 micrometers as fundamental frequency light.
The working process is as follows: the pump source 7 with the coupling system pumps the three-section bonding function composite crystal 2 to generate fluorescence of a 1.06 micron wave band, oscillation laser is formed in a fundamental frequency light resonant cavity formed by the fundamental frequency light total reflection lens 1 and the output lens 5 and is modulated by the Q-switch 6, so that the oscillation laser has strong peak power, the three-section bonding function composite crystal 2 generates 1.18 micron laser from Raman and generates laser of a 1.7 micron wave band through parametric oscillation when passing through the KTA crystal 4, and the laser of the 1.7 micron wave band oscillates and is enhanced and partially output in an optical parametric oscillation cavity formed by the optical parametric oscillation cavity total reflection lens 3 and the output lens 5.
In the embodiment, the three-segment bonding function composite crystal 2 can greatly improve the heat effect compared with a common self-Raman crystal, the length of a Raman gain medium is increased, the Raman laser conversion efficiency is effectively improved, the possibility is provided for a frequency conversion technology which is cascaded with KTA optical parametric oscillation in a near step, and the KTA optical parametric oscillation adopts a non-critical phase matching technology, so that the method has the advantages of no walk-off effect, high optical parametric oscillation conversion efficiency and the like by increasing the effective length of the crystal.
The most critical optical parametric oscillation cavity total reflection lens 3 and the output lens 5 of the present embodiment are plated with the lens transmittance parameters shown in fig. 2, in which M2 corresponds to the film-plated transmittance curve of the optical parametric oscillation cavity total reflection lens 3, and M1 corresponds to the film-plated transmittance curve of the output lens 5.
After the system is built according to the requirements, the measured laser output wavelength is 1742 nm. Under the incident pumping power of 15W and the acousto-optic Q-switching repetition frequency of 90kHz, 1.7 micron signal light output with the maximum output power of 2.1W and the pulse width of 10.8ns is obtained, and the conversion rate reaches 14%.
The utility model has the advantages of reasonable design, simple structure, laser conversion efficiency is high, utilize three-section bonding YVO4/Nd:YVO4/YVO4The functional composite crystal and KTA optical parametric oscillation are cascaded, the high-efficiency Raman conversion efficiency of the composite functional crystal is exerted, the high-efficiency 1.7-micron waveband laser output is realized, and the practicability is good.
The above embodiments are only used for further explanation of the present invention, and it is not understood that the present invention is limited by the protection scope of the present invention, and the technical engineers in the field are right according to the above contents of the present invention.
Claims (9)
1. An acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser is characterized in that: the optical parametric oscillation cavity comprises a pumping source with a coupling system, a fundamental frequency light total reflection lens, a three-section bonding function composite crystal, a Q switch, an optical parametric oscillation cavity total reflection lens, a KTA crystal and an output lens which are sequentially arranged on an optical path, wherein axial center lines of the pumping source with the coupling system, the fundamental frequency light total reflection lens, the three-section bonding function composite crystal, the Q switch, the optical parametric oscillation cavity total reflection lens, the KTA crystal and the output lens are overlapped, a fundamental frequency light resonant cavity is formed between the fundamental frequency light total reflection lens and the output lens, and an optical parametric oscillation cavity is formed between the optical parametric oscillation cavity total reflection lens and the output lens.
2. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 1, characterized in that: the three-segment bonding function composite crystal is a three-segment bonding YVO4/Nd YVO4/YVO4 crystal, the middle Nd YVO4 is a self-Raman crystal, and two ends of the Nd YVO4 crystal are bonded with a YVO4 crystal.
3. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 2, characterized in that: the KTA crystal is a noncritical phase matching cutting KTA crystal.
4. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 3, characterized in that: the Q switch comprises an acousto-optic Q switch, an electro-optic Q switch and a passive Q-switching crystal.
5. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 4, characterized in that: the pumping source of the band coupling system is a semiconductor laser with the output wavelength of 808 nm or 880 nm.
6. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 5, characterized in that: the fundamental frequency light total reflection lens is used for increasing the reflection of 808 nm or 880 nm waveband laser and simultaneously highly reflecting 1.06 and 1.18 micron waveband laser.
7. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 6, characterized in that: the optical parametric oscillation cavity total reflection lens is used for increasing the reflection of 1.06 micron and 1.18 micron wave band laser and simultaneously highly reflecting 1.7 micron wave band laser.
8. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 7, characterized in that: the output lens is highly reflective to laser with wave bands of 1.06 micrometers and 1.18 micrometers, is partially transparent to laser with wave bands of 1.7 micrometers, is used for outputting laser with wave bands of 1.7 micrometers, is highly transparent to laser with wave bands of 1.5 micrometers, has a transmittance of more than 50%, and is used for inhibiting laser with wave bands of 1.5 micrometers generated by parametric oscillation of KTA driven by 1.06 micrometers as fundamental frequency light.
9. The acousto-optic Q-switched bonded yttrium vanadate Raman and optical parametric oscillation cascade frequency conversion laser according to claim 1, characterized in that: the method comprises the steps that a pumping source (7) with a coupling system pumps a three-section bonding function composite crystal (2) to generate fluorescence with a wave band of 1.06 microns, oscillation laser is formed in a fundamental frequency light resonant cavity formed by a fundamental frequency light total reflection lens (1) and an output lens (5) and is modulated through Q-switch light (6), so that the oscillation laser has strong peak power, the three-section bonding function composite crystal (2) generates 1.18 micron laser from Raman and generates laser with a wave band of 1.7 microns through parametric oscillation when the laser passes through a KTA crystal (4), and the laser with the wave band of 1.7 microns oscillates in an optical parametric oscillation cavity formed by the optical parametric oscillation cavity total reflection lens (3) and the output lens (5) to be strengthened and partially output.
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