近红外KTP单共振光参量振荡器

本文报道了角度调谐KTP单共振参量振荡器(SRO)的实验结果,并对结果进行了分析讨论.采用调QNd:YAG激光的二次谐波作为泵浦源.受腔镜涂膜带宽的限制,调谐范围为785～1010nm.最大的参量光脉冲能量为2.4mJ.最大的能量转换效率为26.3%.     

光栅腔BBO光参量振荡器

报道０．５３２μｍ泵浦的光栅腔ＢＢＯ光参量振荡器的实验研究结果，在１．０２－１．０８μｍ可调谐范围内，其输出线宽小于１ｎｍ，参量转换效率为３．５％。     

角度调谐光参量振荡器的理论

推导、计算了晶体角度调谐光参量振荡器的信号光波长与调谐速率之间的关系曲线,并对信号光单谐振和空闲光单谐振两种情况进行了分析和比较,所得结果对获得高效、宽调谐光参量振荡器实验研究具有一定的指导意义。     

光参量振荡器线宽研究

对０．５３２μｍ波长光泵浦的ＢＢＯ光参量振荡器产生线宽的机制进行了详细分析和计算，结果与实验基本一致，实验结果表明泵浦光发散角是产生线宽的主要因素。文中的分析方法可推广至其它单轴晶体光参量振荡器线宽的分析。     

宽调谐高效率的BBO光参量振荡器

本文报道用354.7nm泵浦的单共振BBO脉冲光参量振荡器在413～661nm和2513～765nm波段内获得了可调谐的振荡输出,最高总能量转换效率达52％;文中还讨论了输出特性。     

高斯反射率镜单谐振光参量振荡器模式分析

采用高斯光束传输矩阵描述光参量谐振腔的行为,通过迭代计算模拟高斯光抽运高斯反射镜单谐振光参量振荡器的振荡过程,分析了谐振腔参数和抽运光口径对腔内输出模式的影响。报道了1 064μm脉冲抽运平 GRM腔单谐振非临界相位匹配KTP光参量振荡器的实验,其结果与理论分析相符。     

双波长光参量振荡器的研究进展及应用

双波长光参量振荡器是一类非常新颖的激光器件。本文阐述了双波长光参量振荡器的工作原理,并总结了双波长光参量振荡器的研究进展,探讨了双波长光参量振荡器发展中存在的技术问题,介绍了双波长光参量振荡器的应用。     

微弱光学图像的光参量放大特性的研究

研究了微弱光学图像在光参量图像放大中的放大特性,分析了相位匹配和晶体的空间频率带宽对图像信号增益的影响,从实验上验证了不同的相位匹配时输入图像信号在傅里叶平面上的增益分布.结果表明,当晶体的空间频率带宽大于输入图像信号的空间频率带宽且完全相位匹配时,光参量图像放大器能够对输入图像信号实现无失真、高增益的理想放大;有相位失配时,图像信号的增益峰值向高空间频率范围移动,并且在峰值附近范围变窄,随相位失配量大小的变化能够对图像信号光场中某特定空间频率实现放大,对图像信号进行滤波处理,突出图像特定频率的信息,实现图像边缘增强.     

高功率腔内双共振2μm光参量振荡器特性研究

报道了一种稳定的高功率双共振2?μm 光参量振荡器（OPO）. 该OPO使用调Q的线偏振全固态Nd∶YAG激光器作为抽运源,利用双棒串接补偿热致双折射和双Q开关正交放置技术提高了抽运源的输出功率和光束质量,通过腔内抽运单块KTP晶体实现了稳定的高功率2?μm 激光输出. 在调Q频率为5?kHz时,得到了295 W的2?μm 激光输出. 研究了OPO输出功率同KTP晶体温度和声光Q调制频率的关系,并测量了在29W时2?μm激光的功率稳定性. 在1 h内该OPO的功率起伏小于1.4%. 关键词： 光参量振荡器 2?μm激光器 KTP晶体 双共振     

基于光学参量振荡器的可调谐红外激光的强度噪声特性

红外激光光源在微量气体、高分辨率光谱分析和量子光学研究等领域具有重要的应用.本文利用锁定单共振光学参量振荡器内腔标准具的方案获得了无跳模连续调谐的红外激光输出,理论和实验研究了红外激光的强度噪声特性,分析了影响强度噪声的因素.通过控制非线性晶体的温度和标准具调制信号实现了对红外激光强度噪声的抑制.当控制非线性晶体工作温度为60℃,内腔标准具调制信号为8 kHz时,单共振光学参量振荡器输出信号光和闲置光的强度噪声分别降低了11和8 dB.     

Continuous-wave mid-infrared intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate

This paper reports a continuous-wave (CW) mid-infrared intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate (PPLN) pumped by a diode-end-pumped CW Nd:YVO$_{4}$ laser. Considering the thermal lens effects, it adopted an optical ballast lens and the near-concentric cavity for better operation. At the PPLN's grating period of 28.5\,$\mu$m and the temperature of 140\du, the maximum idler output power of 155\,mW at 3.86\,$\mu$m has been achieved when the 808\,nm pump power is 8.5\,W, leading to an optical-to-optical conversion efficiency of 1.82{\%}.     

Continuous-wave mid-infrared intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate

This paper reports a continuous-wave （CW） mid-infrared intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate （PPLN） pumped by a diode-end-pumped CW Nd：YVO4 laser. Considering the thermal lens effects, it adopted an optical ballast lens and the near-concentric cavity for better operation. At the PPLN＇s grating period of 28.5 μm and the temperature of 140℃, the maximum idler output power of 155 mW at 3.86 μm has been achieved when the 808 nm pump power is 8.5 W, leading to an optical-to-optical conversion efficiency of 1.82%.     

Brewster-oriented passive Q-switch intracavity optical parametric oscillator

The behaviour of passively Q-switched solid-state lasers containing intracavity optical parametric oscillators (OPOs) is described, and a model to optimize this system‘s performance is developed. Meanwhile, an Nd:YAG laserpumped KTiOPO4 (KTP) intracavity OPO for eye safe laser output is studied experimentally. A Brewster-oriented bis-(4-dimethylaminodithiobenzil)-nickel (BDN) dye film is employed in laser cavity, which plays the double role of a passive Q-switch and a Brewster plate, to Q-switch the light to increase its intensity and polarize the light so that the polarization plane of fundamental irradiation is perpendicular to the Z-axis of KTP serving as the OPO nonlinear crystal, thereby providing type Ⅱ phase matching conditions to generate 1.572μm eye-safe signal laser. Eye-safe signal radiations of 6.6mJ per pulse at 1.572μm wavelength and pulse width as narrow as 6.0ns (FWHM) were obtained. Peak power was up to 1.1MW.     

Tunable femtosecond laser in the visible range with an intracavity frequency-doubled optical parametric oscillator

We demonstrated experimentally a synchronously pumped intracavity frequency-doubled femtosecond optical parametric oscillator (OPO) using a periodically-poled lithium niobate (PPLN) as the nonlinear material in combination with a lithium triborate (LBO) as the doubling crystal. A Kerr-lens-mode-locked (KLM) Ti:sapphire oscillator at the wavelength of 790 nm was used as the pump source, which was capable of generating pulses with a duration as short as 117 fs. A tunable femtosecond laser covering the 624-672 nm range was realized by conveniently adjusting the OPO cavity length. A maximum average output power of 260 mW in the visible range was obtained at the pump power of 2.2 W, with a typical pulse duration of 205 fs assuming a sech2 pulse profile.     

自抽运光参变振荡器的特性分析

推导了稳态运行的自抽运单共振光参变振荡器(Self-Pumped Singly Resonant Optical Parametric Oscillator,SPSRO)的功率特性表达式.分析了环形谐振腔的结构特性,外部抽运波、激光、信号波的高斯光束聚焦特性,二阶非线性作用过程中的相位失配,以及四能级激光增益介质的端面抽运特性.以掺钕的周期极化铌酸锂(Nd:PPLN)同时作为激光增益和二阶非线性介质,分析了自抽运单共振光参变振荡器的阈值和输出信号波的功率特性.结果可应用于分析一般激光器和单共振光参变振荡器的功率特性.     

高效率LiB3O5光参量振荡器

本文报道LiB_3O_5(LBO)光参量振荡的运转.输出波长范围为:0.956～1.205μm和1.488～1.583μm(0.828～0.801μm).最高输出能量大于70mJ/pulse,效率为43%.文中还给出了双轴晶体LBO的相位匹配曲线和有效非线性系数的计算方法及结果.     

High efficiency continuous-wave tunable signal output of an intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate

In this paper we report on a continuous-wave (CW) intracavity singly resonant optical parametric oscillator (ICSRO) based on periodically poled LiNbO₃ (PPLN) pumped by a diode-end-pumped CW Nd:YVO₄ laser. Considering the thermal lens effects and diffraction loss, an optical ballast lens and a near-concentric cavity are adopted for better operation. Through varying the grating period and the temperature, the tunable signal output from 1406~nm to 1513~nm is obtained. At a PPLN grating period of 29~μ m and a temperature of 413~K, a maximum signal output power of 820~mW at 1500~nm is achieved when the 808~nm pump power is 10.9~W, leading to an optical-to-optical conversion efficiency of 7.51%.     

高增益LiNbO3光参量振荡器

报道一台采用调Q红宝石激光器泵浦的高增益角度调谐LiNbO_3光参量振荡器.最大输出能量和转换效率分别高达50mJ/pulse和19%.该振荡器从1.1444μm到1.7652μm连续可调谐.