CN101986486B - Optical parametric oscillator for intracavity mode mismatch compensation - Google Patents
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Abstract
本发明涉及一种内腔式模式失配补偿的光参量振荡器，光路中依次放置全反腔镜，激光晶体，声光Q开关，复合腔镜，对闲频光吸收的平面介质镜，非线性光学晶体，输出腔镜。其特征在于光路放置对闲频光吸收的平面介质镜利用吸收闲频光，起到类似可变焦距透镜的作用，用于补偿非线性光学晶体上基频激光谐振腔和光参量振荡器振荡腔的模式失配的作用。可有效提高光参量振荡器的转换效率。
The invention relates to an optical parametric oscillator with internal cavity mode mismatch compensation. In the optical path, a total anti-cavity mirror, a laser crystal, an acousto-optic Q switch, a composite cavity mirror, and a planar dielectric mirror for absorbing idler-frequency light are placed in sequence in the optical path. Linear optical crystal, output cavity mirror. It is characterized in that the planar dielectric mirror placed on the optical path to absorb the idler light absorbs the idler light, and plays a role similar to a variable focal length lens, which is used to compensate the fundamental frequency laser resonator cavity and the optical parametric oscillator oscillator cavity on the nonlinear optical crystal. The role of schema mismatch. The conversion efficiency of the optical parametric oscillator can be effectively improved.
Description
Technical field
The optical parametric oscillator of a kind of intracavity mode mismatch compensation of the present invention, relates to a kind of laser aid, belongs to optoelectronic areas
Background technology
Optical parametric oscillator has tunable advantage, and its tuning range can be from ultraviolet to far infrared, make up common lasers and can only export a kind of shortcoming of wavelength laser, be the important channel that obtains wideband adjustable, high coherent radiation light source and new wave band of laser system, there is very high using value.Especially in recent years, increasingly mature along with the appearance of a collection of novel nonlinear optical crystal and optical frequency switch technology, optical parametric oscillator technology has obtained breakthrough progress, is widely used in the fields such as environmental monitoring, material processed, data communication, photoelectric measurement, laser ranging and laser radar.
Current optical parametric oscillator mainly can be divided into external cavity type and two kinds of modes of intracavity realize.Optical parametric oscillator mainly produces a flashlight and ideler frequency light by pump light (for intracavity optical parametric oscillator, pump light claims again fundamental frequency light) pumping.External cavity type optical parametric oscillator is coupled to pump light in optical parametric oscillator through focusing on, and can conveniently realize the pattern matching of pump light and optical parametric oscillator chamber mould.But external cavity type optical parametric oscillator pumping light power is lower, adopts focusing system to improve power density and make system become complicated.Intracavity optical parametric oscillator is placed in the optical parametric oscillator chamber (hereinafter referred optical parametric oscillation chamber) that vibrates in basic frequency laser resonant cavity (hereinafter referred fundamental frequency chamber), the conversion that can utilize the high power density in fundamental frequency light (claiming again the pump light of optical parametric oscillator) chamber to improve optical parametric oscillation, but the pattern matching difficulty in fundamental frequency chamber and optical parametric oscillation chamber.We are calculated and are found, when introduce a lens of variable focal length (along with the rising of pump power, the focal length of lens shortens) in optical parametric oscillation chamber, can effectively extenuate the problem of mode mismatch by theory.When introducing lens in the optical parametric oscillation chamber of intracavity optical parametric oscillator, as shown in Figure 1.According to the laser system Structure Calculation of Fig. 1 fundamental frequency chamber and the optical parametric oscillation chamber chamber mode radius on nonlinear optical crystal, as shown in Figure 2.As shown in Figure 2, along with the rising of pump power, the chamber mode radius of fundamental frequency chamber on nonlinear optical crystal diminishes, but the chamber mode radius of optical parametric oscillation chamber on nonlinear optical crystal is constant.So along with the rising of pump power, two chamber mould mode mismatches are more and more serious.When shortening the focal length of lens of introducing in optical parametric oscillation chamber, will be conducive to extenuate two chamber mould mode mismatches under high power, but can cause two chamber mould mode mismatches under low-power.If so adopt lens of variable focal length, will be conducive to realize effective output of the laser raising along with pump power.
Summary of the invention
The object of this invention is to provide a kind of optical parametric oscillator of intracavity mode mismatch compensation, effectively extenuate intracavity optical parametric oscillator mode mismatch problem, thereby improve the conversion efficiency of optical parametric oscillator.
Technical solution of the present invention is described below by reference to the accompanying drawings:
The optical parametric oscillator of intracavity mode mismatch compensation of the present invention, places the chamber mirror 1 that is all-trans successively in light path, laser crystal 2, and acoustooptic Q-switching 3, Compound Cavity mirror 4, to the planar medium mirror 7 of ideler frequency light absorption, nonlinear optical crystal 5, output cavity mirror 6.Wherein be all-trans chamber mirror 1 and output cavity mirror 6 forms fundamental frequency chamber, forms optical parametric oscillation chamber by Compound Cavity mirror 4 and output cavity mirror 6.
The described planar medium mirror 7 to ideler frequency light absorption has certain thickness, and thickness can select 2mm between 10mm.
The described chamber mirror 1 that is all-trans plates the film system to the high reflection of basic frequency laser; Described output cavity mirror 6 plates the high film system of reflecting and flashlight part is seen through of basic frequency laser; Described Compound Cavity mirror 4 plates the high transmission of basic frequency laser, simultaneously the film system to the high reflection of flashlight; The described planar medium mirror 7 to ideler frequency light absorption plates simultaneously to the anti-reflection film system of flashlight, ideler frequency light and basic frequency laser.
The optical parametric oscillator implementation of intracavity mode mismatch compensation of the present invention is: the fundamental frequency light being produced by laser crystal 2 forms fundamental frequency chamber interior resonance at be all-trans chamber mirror 1 and output cavity mirror 6, and modulate to improve fundamental frequency light peak power in fundamental frequency chamber by acoustooptic Q-switching, produce flashlight and ideler frequency light by nonlinear optical crystal 5 optical parametric conversions simultaneously.Flashlight forms vibration reinforcement in optical parametric oscillation chamber at Compound Cavity mirror 4 and output cavity mirror 6, and by output cavity mirror 6 output signal light.Thereby by the ideler frequency light absorption heating to passing through, heat is caused the graded of refractive index to outdiffusion by center, play an effect of playing similar lens of variable focal length to the planar medium mirror 7 of ideler frequency light absorption.
Due to the rising of laser pumping power, fundamental frequency light strengthens, thereby flashlight and ideler frequency light also strengthen, so the thermal focal of the thermal lens effect that the planar medium mirror 7 of ideler frequency light absorption is caused shortens, the planar medium mirror 7 of ideler frequency light absorption is played to the lensing that focal length shortens along with pump power rising.According to theoretical calculating above, introduce the effect that can play compensation model mismatch to the planar medium mirror 7 of ideler frequency light absorption.
The optical parametric oscillator of the follow-on intracavity mode mismatch compensation of another kind of the present invention, can be without Compound Cavity mirror 4 in light path, the one side of the close acoustooptic Q-switching 3 of the planar medium mirror 7 to ideler frequency light absorption changes plating to the high transmission of basic frequency laser, film system to the high reflection of flashlight, plays the effect that replaces Compound Cavity mirror 4 simultaneously.
Accompanying drawing explanation
Fig. 1, the schematic diagram of lens of introducing in intracavity optical parametric oscillator chamber;
Fig. 2, the result of calculation figure of fundamental frequency chamber and the optical parametric oscillation chamber chamber mode radius on nonlinear optical crystal;
Fig. 3, a kind of schematic diagram of optical parametric oscillator of intracavity mode mismatch compensation;
Fig. 4, a kind of schematic diagram of optical parametric oscillator of modified model intracavity mode mismatch compensation
Drawing explanation: 1 is the chamber mirror that is all-trans, and 2 is laser crystal, and 3 is acoustooptic Q-switching, and 4 is Compound Cavity mirror, and 5 is nonlinear optical crystal, and 6 is output cavity mirror, and 7 is the planar medium mirror to ideler frequency light absorption.
Embodiment
Embodiment 1: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 3, for exporting 1.5 microns of laser.
By laser crystal Nd:YVO
4the fundamental frequency chamber interior resonance that 2 1.06 microns of fundamental frequency light that produce form at be all-trans chamber mirror 1 and output cavity mirror 6, and modulate to improve fundamental frequency light peak power in fundamental frequency chamber by acoustooptic Q-switching, produce 1.5 microns of flashlights and 3.5 microns of ideler frequency light by nonlinear optical crystal KTP5 optical parametric conversion simultaneously.1.5 microns of flashlights form vibration reinforcement in optical parametric oscillation chamber at Compound Cavity mirror 4 and output cavity mirror 6, and export 1.5 microns of flashlights by output cavity mirror 6.Thereby the planar medium mirror 7 of ideler frequency light absorption will be generated heat to pass through 3.5 microns of ideler frequency light absorption, heat is caused the graded of refractive index to outdiffusion by center, play the effect of a thermal lens, thereby effectively the mode mismatch problem while not adding the planar medium mirror 7 to ideler frequency light absorption is extenuated in compensation.Adopt the diode-end-pumped of coupling fiber, under the pump power of 20W, realized the above 1.5 microns of flashlights of 3W, light phototranstormation efficiency is more than 15%, the optical parametric oscillator that does not relatively carry out mode mismatch compensation, and efficiency improves nearly one times.
Embodiment 2: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 4, for exporting 1.5 microns of laser.
By laser crystal Nd:YVO
4the fundamental frequency chamber interior resonance that 2 1.06 microns of fundamental frequency light that produce form at be all-trans chamber mirror 1 and output cavity mirror 6, and modulate to improve fundamental frequency light peak power in fundamental frequency chamber by acoustooptic Q-switching, produce 1.5 microns of flashlights and 3.5 microns of ideler frequency light by nonlinear optical crystal KTP5 optical parametric conversion simultaneously.1.5 microns of flashlights form vibration reinforcement in optical parametric oscillation chamber at the left side and the output cavity mirror 6 of the planar medium mirror 7 to ideler frequency light absorption, and export 1.5 microns of flashlights by output cavity mirror 6.Thereby the planar medium mirror 7 of ideler frequency light absorption will be generated heat to pass through 3.5 microns of ideler frequency light absorption, heat is caused the graded of refractive index to outdiffusion by center, play the effect of a thermal lens, thereby effectively the mode mismatch problem while not adding the planar medium mirror 7 to ideler frequency light absorption is extenuated in compensation.Adopt the diode-end-pumped of coupling fiber, under the pump power of 20W, realized the above 1.5 microns of flashlights of 3W, light phototranstormation efficiency is more than 15%, the optical parametric oscillator that does not relatively carry out mode mismatch compensation, and efficiency improves nearly one times.
Embodiment 3: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 3 (or Fig. 4), for exporting 1.5 microns of laser.
Different from embodiment 1,2 is that described laser crystal 2 adopts Nd:YAG or Nd:YAP or Nd:KGW or Nd:GdVO
4, make the optical parametric oscillator that an intracavity mode mismatch compensates.
Embodiment 4: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 3 (or Fig. 4), for exporting 1.5 microns of laser.
Different from embodiment 1,2 is, and described nonlinear optical crystal adopts by θ=90 °, and the KTA of the noncritical phase matching cutting of φ=0 °, makes the optical parametric oscillator that an intracavity mode mismatch compensates.
Embodiment 5: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 3, for exporting 2 microns of laser.
By laser crystal Nd:YVO
4the fundamental frequency chamber interior resonance that 2 1.3 microns of fundamental frequency light that produce form at be all-trans chamber mirror 1 and output cavity mirror 6, and modulate to improve fundamental frequency light peak power in fundamental frequency chamber by acoustooptic Q-switching, simultaneously produce near ideler frequency light 2 microns of flashlights and 3.5 microns by nonlinear optical crystal KTP5 optical parametric conversion.2 microns of flashlights form vibration reinforcement in optical parametric oscillation chamber at Compound Cavity mirror 4 and output cavity mirror 6, and export 2 microns of flashlights by output cavity mirror 6.Thereby to the planar medium mirror 7 of ideler frequency light absorption by near ideler frequency light absorption heating pass through 3.5 microns, heat is caused the graded of refractive index to outdiffusion by center, play the effect of a thermal lens, thereby effectively the mode mismatch problem while not adding the planar medium mirror 7 to ideler frequency light absorption is extenuated in compensation.Adopt the diode-end-pumped of coupling fiber, under the pump power of 20W, realized the above 2 microns of flashlights of 2W, light phototranstormation efficiency is more than 10%, the optical parametric oscillator that does not relatively carry out mode mismatch compensation, and efficiency improves nearly one times.
Embodiment 6: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 4, for exporting 2 microns of laser.
By laser crystal Nd:YVO
4the fundamental frequency chamber interior resonance that 2 1.3 microns of fundamental frequency light that produce form at be all-trans chamber mirror 1 and output cavity mirror 6, and modulate to improve fundamental frequency light peak power in fundamental frequency chamber by acoustooptic Q-switching, simultaneously produce near ideler frequency light 2 microns of flashlights and 3.5 microns by nonlinear optical crystal KTP5 optical parametric conversion.2 microns of flashlights form vibration reinforcement in optical parametric oscillation chamber at the left side and the output cavity mirror 6 of the planar medium mirror 7 to ideler frequency light absorption, and export 2 microns of flashlights by output cavity mirror 6.Thereby to the planar medium mirror 7 of ideler frequency light absorption by near ideler frequency light absorption heating pass through 3.5 microns, heat is caused the graded of refractive index to outdiffusion by center, play the effect of a thermal lens, thereby effectively the mode mismatch problem while not adding the planar medium mirror 7 to ideler frequency light absorption is extenuated in compensation.Adopt the diode-end-pumped of coupling fiber, under the pump power of 20W, realized the above 2 microns of flashlights of 2W, light phototranstormation efficiency is more than 10%, the optical parametric oscillator that does not relatively carry out mode mismatch compensation, and efficiency improves nearly one times.
Embodiment 7: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 3 (or Fig. 4), for exporting 2 microns of laser.
Different from embodiment 1,2 is that described laser crystal 2 adopts Nd:YAG or Nd:YAP or Nd:KGW or Nd:GdVO
4, make the optical parametric oscillator that an intracavity mode mismatch compensates.
Embodiment 8: make the optical parametric oscillator of an intracavity mode mismatch compensation according to the light path of Fig. 3 (or Fig. 4), for exporting 2 microns of laser.
Different from embodiment 1,2 is, and described nonlinear optical crystal adopts by θ=90 °, and the KTA of the noncritical phase matching cutting of φ=0 °, makes the optical parametric oscillator that an intracavity mode mismatch compensates.
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| CN1334626A (en) * | 2001-08-24 | 2002-02-06 | 清华大学 | Optical parametric oscillator with reflectivity-variable internal cavity |
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