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通过1064 nm激光抽运KTP晶体内腔光参量振荡(OPO)技术获得了近衍射极限的2.68μm激光输出,对实验结果开展了详细的分析。抽运源为声光调QNd:YAG激光器,光参量振荡器谐振腔采用双谐振结构,将两块相同的KTP晶体光轴相向放置以补偿走离效应,KTP晶体按φ=0°,θ=62°切割以获得波长2.7μm激光输出,采用Ⅱ类相位匹配(o→o+e)以利用较大的非线性系数。在808 nm激光二极管抽运功率为330 W,声光Q开关工作频率为7 kHz的条件下,获得平均功率7.6 W,波长2.68μm激光输出,光束质量因子M2小于1.6,对应信号光1.765μm激光输出功率约14 W。
The near-diffraction limit 2.68μm laser output was obtained by the optical parametric oscillator (OPO) technique of 1064 nm laser pumping KTP crystal cavity. The experimental results were analyzed in detail. The pumping source is an acousto-optic QNd: YAG laser, and the optical parametric oscillator uses a double resonant structure. The two identical KTP crystal optical axes are placed opposite each other to compensate for the walk-away effect. The KTP crystal is designed with φ = 0 ° and θ = 62 ° cut to obtain a wavelength of 2.7μm laser output, using phase Ⅱ match (o → o + e) to take advantage of the larger nonlinear coefficient. Under the condition of the pumping power of 808 nm laser diode is 330 W and the working frequency of acousto-optic Q switch is 7 kHz, the average power of 7.6 W and the wavelength of 2.68 μm laser output are obtained. The beam quality factor M2 is less than 1.6. Corresponding signal light 1.765 μm laser Output power of about 14 W.