670.7nm激光抽运下的祖母绿晶体激光运转实验研究

为了实现我国温差水热法生长的祖母绿晶体的激光运转,利用Nd∶YAP的1.3414μm激光经过LBO晶体倍频得到的670.7nm红光作为抽运光源,采用对称共焦腔实现了祖母绿晶体732nm红外激光的输出,激光阈值在0.5W~0.6W之间。在输入功率达到2.89W时获得了46μW的732nm激光输出。     

祖母绿激光晶体及其激光器的研究现状与发展

祖母绿是一种名贵宝石和优秀的激光晶体材料。总结了国内外祖母绿激光晶体在合成工艺及其激光器的研究现状，对比了水热法和助熔剂法合成祖母绿晶体生长工艺的不同特点和激光特性方面的异同，通过对我国水热法生长的祖母绿晶体的激光性能及其器件研究，指出提高祖母绿晶体的质量与尺寸、使用新型LD泵浦技术和腔型结构，有望获得较高的红外激光输出。     

调Q开关翠绿宝石激光治疗颧部褐青色痣202例临床分析

目的 :观察调Q开关翠绿宝石激光治疗颧部褐青色痣的临床效果。方法 :运用Q开关翠绿宝石激光治疗颧部褐青色痣。结果 :2 0 2例颧部褐青色痣经 1 -5次治疗 ,痊愈 84例 ,显效 6 1例 ,总有效率为 71 .8% ,除色素沉着外无其它副作用。结论 :Q开关翠绿宝石激光治疗颧部褐青色痣疗效满意 ,安全可靠。     

激光二极管抽运下的祖母绿晶体自由运转激光器

报道了温差水热法生长的祖母绿晶体在660 nm激光二极管(LD)抽运下的激光实验结果。根据祖母绿晶体的光学特点和生长情况,加工了长度分别为10.5 mm和3.4 mm的两种激光棒,并分别进行了激光实验。当激光二极管输入功率为2.68 W时,在平凹腔中祖母绿晶体分别实现了2.7 mW和24 mW的731 nm红外激光的自由输出,其中长度3.4 mm激光晶体的光-光转换效率为1.4%,斜率效率为11.9%,激光阈值在0.7 W附近,并分析讨论了效率低的原因。     

High gain laser performance in alexandrite

Half-jouleQ-switched pulses of 20 ns duration have been obtained from an alexandrite laser operating on the high-gainR-line. Unique tandem pulsing, involving both a fixed and a tunable frequency pulse, is also observed.     

Lasing properties of chromium-aluminum-doped forsterite pumped withan alexandrite laser

The lasing properties of chromium-aluminum-doped forsterite were investigated using a tunable alexandrite laser as the pump source. Results of measurements of the lasing threshold, slope efficiency, spectral and temporal profiles of the laser pulse, and the time delay between the alexandrite pump pulse and the laser emission are presented for pump wavelengths of 770, 746, and 730 nm and different pump beam energies. Laser rate equations are developed to model the lasing center as a four-level system and applied to the case of 746-nm pumping     

Intracavity Raman lasers

Experimental and theoretical studies of intracavity Raman lasers are presented. Advantages of intracavity Raman lasers, particularly for low-emission cross section and broadly tunable vibronic gain media, are described. Experimental studies of a hydrogen gas Raman laser pumped inside the cavity of an alexandrite laser are presented. A theoretical model of the dynamics of a unidirectional intracavity Raman ring laser is developed and solved analytically. This model is adapted for simulation experiments     

可调谐紫翠宝石激光器

用三元石英双折射滤光片对紫翠宝石激光进行调谐,已得到从735.7～796.1nm间60.4nm的连续调谐输出。用LiF被动晶体Q开关工作时激光线宽约为0.001nm。调谐时输出能量无明显下降,振荡阈值只增加了5％。     

BeAl_2O_4:Cr~(3+)晶体激光性能的改进

报道了改进BeAl_2O_4:Cr~(3+)晶体激光性能的几项措施。得到的晶体的激光振荡阈值大大降低,而激光器输出能量及调谐范围提高。     

Tunable CW alexandrite laser

Wavelength-tunable CW laser action has been obtained from solid-state alexandrite, BeAl2O4:Cr³⁺. Laser emission occurred between 744 and 788 nm with a maximum of 6.5 W observed at the 765 nm wavelength with 3 kW of mercury arc excitation.     

A tunable emerald laser

Emerald is a new broadly wavelength-tunable vibronic laser material with stimulated emission in the red to infrared due to⁴T_{2} rightarrow⁴Atransitions of Cr³⁺. Emerald has gain from 12 050 cm^-1to 14 000 cm^-1with high gain from about 12 300 cm^-1to 13 700 cm^-1. An emerald laser oscillator has been achieved, but has high losses.     

Multi-reentrant nonplanar ring laser cavity

A multi-reentrant nonplanar ring laser cavity configuration is presented. Two identical spherical mirrors were used to construct the laser cavity. The exact reentrant condition of the ring cavity is derived and the stability of the laser cavity is analyzed. Although slight astigmatism can arise from the intracavity elements, the cavity itself is astigmatism-free. Linear output polarization is readily achieved. A 3-atm.% Nd doped YAG with 1-mm thickness was used as the gain medium to reduce beam distortion, and the gain medium also served as a Faraday rotator to control the laser beam propagation direction. The laser cavity length is short, whereas the laser beam round-trip length can be long. A factor of 13-times enlargement in round-trip length is demonstrated.     

Excited state absorption of pump radiation as a loss mechanism insolid-state lasers

The characteristics of optical pumping dynamics in laser-pumped, rare-earth-doped, solid-state laser materials are investigated by using a tunable alexandrite laser to pump Y₃Al₅O₁₂ :Nd³⁺ in an optical cavity. It is found that the slope efficiency of the Nd laser operation depends strongly on the wavelength of the pump laser. For pump wavelengths resulting in low slope efficiencies, intense fluorescence emission is observed from the sample in the blue-green spectral region. This is attributed to the excited-state absorption of pump photons which occurs during radiationless relaxation from the pump band to the metastable state. This type of process is an important loss mechanism for monochromatic pumping of laser systems at specific pump wavelengths     

高稳定及免调试“猫眼”谐振腔He-Ne激光器的研究

提高谐振腔的稳定性一直是激光技术的一个重大问题。将“猫眼”逆向器作为反射镜,组成“猫眼”谐振腔可提高激光谐振腔的稳定性。以功率稳定性为参考指标,做了一系列对比实验来对比“猫眼”谐振腔He-Ne激光器和现有He-Ne激光器在失调特性、温度漂移方面的性能。结果表明,“猫眼”谐振腔激光器稳定性显著优于传统平凹谐振腔和凹凹谐振腔激光器。进行了免调节“猫眼”谐振腔He-Ne激光器的实验,“猫眼”谐振腔He-Ne激光器的功率稳定性达到了以前各种构造的He-Ne激光器无法达到的高水平。     

XeCl准分子激光泵浦的无腔染料激光器和紫外-可见波段调谐染料激光器

（一）无腔染料激光器 一、引言 不使用共振腔便能得到强受激发射的光通称为放大自发辐射NIASE，一般也叫超辐射或超荧光。它是自发辐射在已形成粒子数反转分布的高增益激活介质中沿激活区轴向传播时通过感应发射过程依次行波放大所产生的。     

Dual-wavelength fibre laser

A new external laser cavity design that allows for wavelength tuning and controlled simultaneous two-mode oscillation is demonstrated for a fibre laser. The gain bandwidth and the position of the gain maximum are determined from the tunability and the minimum threshold, respectively. Two-mode oscillation is shown for different mode wavelength spacings     

Corrugation-pitch-modulated phase-shifted DFB laser

A corrugation-pitch-modulated phase-shifted distributed feedback (DFB) laser is proposed to reduce the spatial-hole-burning effect along the laser cavity. The structure of the proposed corrugation-pitch-modulated phase-shifted DFB laser is illustrated. A reduction in this effect is confirmed from its spectral behavior as a function of driving current. Consequently, stable single-longitudinal-mode operation up to high-output powers is obtained     

定向棱镜激光腔模式模拟研究

为了探究定向棱镜谐振腔激光模式分布情况,通过连续利用反射系统的光线矢量的反射定律,推导出具有二面角误差的角锥棱镜相位模型,首次创新性地建立了定向棱镜腔的光场数学模型,并运用FOX-LI的理论。研制了一套求解各种腔形的稳态模的场分布软件。用这套软件模拟出了定向棱镜谐振腔自再现模的分布。同时,针对免调试固体激光器（定向棱镜腔）进行实验,将模拟所得结果与实际激光器的输出近场、远场光斑,以及与光束质量分析仪检测分析结果进行了对比,取得了较好的效果。     

BeAl2O4：Cr^3＋终端声子激光器

本文简述了作为一种终端声子激光系统的可调谐金绿宝石激光器的发展概况,归纳了迄今为止所报道的金绿宝石晶体特性及其生长、激光运转机理和激光性能,并指出其广泛的应用前景。     

The self-pulsing laser oscillator

The self-pulsing laser oscillator is examined theoretically by developing a simple model based on the assumption that the pulse in the laser cavity is a 180° pulse for the medium. The concept of an optical 180° pulse is closely analogous to the idea of a 180° RF pulse discussed in spin-echo studies. The range of parameters for which a laser oscillator is expected to be self-pulsing is found from this theory, and the results are compared with experimental observations of the behavior of a 6328 Å He-Ne laser oscillator. Observations of self-pulsing are made as a function of cavity length, position of the gain medium in the laser cavity, and laser excitation. Observations of pulse widths and output frequency spectra are also reported. It is found that the main features of the experimental observations agree well with the theoretical predictions.