空腔灯泵浦激光器

本文叙述了用空腔(同轴)灯来泵浦圆柱棒钕玻璃的空腔灯泵浦激光器的实验装置与测试结果,并把它们与常用的椭圆聚光罩直管灯泵浦激光器的实验结果进行了比较.     

基于光线追迹的闪光灯泵浦激光聚光腔的结构优化

聚光腔是灯泵固体激光的重要部件,主要作用是最大限度地将泵浦光能聚集到激光棒上的同时,尽可能使激光棒获得均匀的泵浦。为了实现灯泵固体激光器大能量输出,需考虑优化激光聚光腔,提高其泵浦效率。通过以蒙特卡洛离散方法为核心的光线追迹技术和合理的模型建立,以四灯为例,研究了对确定直径的激光棒,泵浦效率随构成腔体的椭圆长短轴比(a/b)的变化,以及同样的长短轴比下,泵浦效率随泵浦灯直径的变化。得到了在确定直径的激光棒和泵浦灯下,泵浦效率最高的椭圆长短轴比例。此外,研究了对确定直径的激光棒在不同直径泵浦灯的情况下,泵浦均匀性随椭圆长短轴比a/b的变化。     

钕玻璃、YAG激光棒长于椭圆腔的实验结果

在[1～4]中,我们报道了长脉冲和调Q脉冲钕玻璃、YAG固体激光器,激光棒长于椭圆腔(灯弧长),比棒与椭圆腔(灯弧长)相等时,能进一步降低阈值,提高输出效率的实验结果。 本文用测量椭圆聚光腔外左右两端、沿加长棒的轴线方向泵浦光能分布规律的方法,对这个问题深入进行了探讨。     

高效新型激光器

本文介绍一种泵浦灯放在激光物质中心的高效新型激光器。文章以单灯椭圆腔为例,分析了提高现有普通激光器效率所存在的问题,进而提出一种泵浦灯放在激光物质中心的新型激光器。     

派热克斯玻璃镀铝的双椭圆激光聚光腔

很多闪光灯泵浦激光器结构是多椭圆结构,在这种结构中增益介质是放在公共的两个或两个以上的圆柱对称椭圆的焦点上。虽然单一闪光灯聚光腔一般更有效,但两个或两个以上闪光灯得到更平稳的泵浦,因此,具有较好的模结构。另外,几个灯分配能量     

加长棒脉冲钕玻璃激光器的阈值,效率实验研究

本文从实验方面研究了加长激光棒使其长于椭圆泵浦腔时，对脉冲钕玻璃激光器输出性能的影响。实验结果发现：在相同条件下，激光棒适当长于椭圆泵浦腔，与棒和椭圆泵浦腔相地相比，能降低泵浦阈值，提高输出效率。     

激活元件直径对连续固体激光器输出功率的影响

激活元件几何尺寸的变化对光泵浦分布和强度、散热功率有影响,因而对固体激光器的所有输出特性有影响。本文在给定的聚光腔几何形状下讨论了辐射输出功率与激活元件直径的关系。为了测定这种关系,根据资料[1]所述方法研究了各种不同直径的YAG:Nd~(3 )激活元件在单椭圆和双椭圆聚光腔内用氪弧灯泵浦时的荧光分布。因为激活元件单元体积的荧光与该体积内吸收的功率成正比,所以对元件体积求积分的荧光与激活元件内吸收     

华北光电技术研究所激光泵浦灯产品介绍

华北光电技术研究所激光泵浦灯产品介绍我所从美国引进的激光泵浦灯生产线，专门用以制造高温过渡封接、内径为Φ４～７ｍｍ的各种直管式脉冲灯和连续氪弧灯，由于采用了国际通用的制灯工艺，产品外形与各种性能指标与国外同类产品一致性好，欢迎广大用户，特别是具有各种...     

Nd：YAG激光器最佳泵浦条件的实验研究

本文报导不同泵浦腔的比较及几何传输效率的数值计算．研究泵浦腔几何尺寸，灯的类型，反射膜层与泵浦效率的关系．并讨论泵浦均匀性及灯放电回路对泵浦效率的影响．     

同轴型脉冲氙灯的进展

一、国内外有关同轴型脉冲氙灯发展概述 1963年、1964年美国Church和Lensick连续报导了同轴氙灯的研制,并与直管氙灯泵浦进行了比较。1965年日本难波进报导用同轴灯泵浦的焊接机试制成功,长150～200毫米,输出10～20焦耳,最大输出达100焦耳,效率为4％,这是工业应用较早的报导。1966年美国西屋公司连续发表强而有效的泵浦灯——同轴灯的研制报告。同年,“国际电子学”杂志报导的高能同轴灯泵浦的激光器,采用可拆式、多个钨电极头的同轴灯,弧长900毫米,激光器泵浦阈值为5000焦耳,当输入25000焦耳时,     

YAG:Nd~(3 )晶体光学均匀性对激光性能测试的影响

在进行N4~(3 ):YAG激光晶体性能测试过程中,常常发现同一根晶体棒在相同的实验条件下于谐振腔内旋转不同角度时可得到不同的实验数值(例如在测定脉冲效率、连续效率、内耗时)。我们考虑这是由于激光棒的不均匀性引起的。     

Properties of two-photon pumped cavity lasing in novel dye dopedsolid matrices

Two-photon pumped frequency upconversion cavity lasing at ~600 nm is accomplished in three types of dye-doped solid rods pumped with ~10 ns and 1.06-μm IR laser pulses. The dopant is a new dye, trans-4-[p-(N-ethyl-N-(hydroxyethyl)amino)styryl]-N-methylpyridinium tetraphenylborate, abbreviated as ASPT, which possesses a greater two-photon absorption cross section and stronger upconversion fluorescence emission than common commercial dyes (such as rhodamine). Three different materials were chosen as solid matrices: poly(2-hydroxyethyl methacrylate), VYCOR porous glass, and sol-gel glass. Using a Q-switched Nd:YAG pulse laser as the pump source, strong cavity lasing could be achieved in these three ASPT doped solid rods as well as in ASPT solution in a liquid cell. The spectral, temporal, and spatial characteristics of the cavity lasing output have been systematically investigated. The measured output-input characteristics, lasing lifetime, and damage threshold for the three different rods are presented     

Compact satellite ranging laser subsystem

This letter describes a compact ruby oscillator-amplifier system suitable for satellite ranging. The laser is comprised of an ellipsoidal pump cavity which contains two laser rods and flashlamps.     

YAG激光器中不同聚光腔的实验比较及分析

在脉冲YAG激光器中，在保持激光棒，泵浦氙灯，谐振腔不变的情况下，实验研究了不同聚光腔对该器件振荡效率的影响，并作了相应的分析。实验表明，精心制作的用MgO粉压制的漫反射聚光腔有不低于单椭园柱聚光腔的效率，并且有制作简便，成本低，照明较均匀，性能稳定，灯和激光棒能方便地同时冷动等优点。     

164W LD侧抽运准连续Nd:YAG/HGTR-KTP高功率绿光激光器

为了研究百瓦级高光束质量绿光激光器,采用激光二极管侧面抽运双棒串接、双声光调Q的方法,依据光束传输矩阵,分析比较了V型折叠腔内分别置入单、双激光晶体时,其热透镜效应对谐振腔稳定性、折叠臂内光场分布以及倍频晶体处子午光斑和弧矢光斑大小的影响,倍频晶体选用具有抗灰迹特性的Ⅱ类临界相位匹配KTP晶体。当总抽运功率为1200W、重复频率为27.2kHz时,得到了脉冲宽度为130ns的164W准连续绿光输出,光光转换效率为13.7%,光束质量因子Mx2=10.46,My2=10.59。结果表明,使用双棒串接、双声光调QV型腔结构,可以获得百瓦级高功率、高光束质量532nm绿光输出。     

双棒串接补偿热致双折射效应激光谐振腔

固体激光器中的热致双折射效应严重地限制了基模输出功率的提高,为了获得大功率高质量的激光输出,需要对热致双折射效应进行补偿.在理论上对双棒在腔内串接补偿热致双折射效应的条件进行了改进,通过设计合理的腔结构和腔内元器件,应用4f成像系统空间滤波器并考虑石英旋光器的厚度,使得腔内光束的退偏率降至2.5%以下.使用矩阵光学的方法简化了对含有这样一个复杂光学系统的谐振腔稳定性和腔内光束半径等特性的分析.通过在腔内加入一个正透镜来扩大基模体积,实验中在双氪灯连续抽运Nd∶YAG激光器中得到了61 W线性偏振的激光基模输出,表明在大基模体积谐振腔的设计中,双折射效应的补偿十分必要.     

Asymmetric ${rm TEM}_{00}$-Mode Cavity for Birefringence-Compensated Two-Rod Solid-State Lasers

An asymmetrical two-rod Nd:YAG laser system was investigated theoretically and experimentally in a cw-operated ${rm TEM}_{00}$-mode cavity. A revised birefringence compensation condition is presented considering the thickness of the 90 $^{circ}$ polarization rotator. By means of equivalent thermal lens of the two rods, the roles of the two arms of the cavity are discussed. The asymmetrical cavity results in twice larger output power and lower misalignment sensitivity of the mirrors than the symmetrical cavity. 61 W linearly polarized output with $M^{2} =1.6$ was obtained experimentally, which is the state of the art for a lamp pumped laser. Cavity mirrors misalignments and thermal induced spherical aberration have great influence on the performance of the resonator such as diffraction loss and beam quality. Beam filling factor turns out to play an important role in reducing their influence. The design of an asymmetrical resonator for birefringence compensation is useful also for high power diode pumped solid state lasers.      

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。     

Thermooptical properties of transversely pumped composite YAG rodswith a Nd-doped core

We report on analytical, numerical, and experimental studies of the thermally induced optical distortions in transversally diode-pumped Nd:YAG composite laser rods. The calculated distributions of temperature, optical path difference, and stress are compared for two different laser rods, a homogeneously doped rod and a composite rod with a hexagonal Nd:YAG core in an undoped YAG rod. Our theoretical investigations of the optical path difference are experimentally confirmed by using a Mach-Zehnder interferometer. It is found that the optical path difference profile of the composite rod has stronger gradients than those of the homogeneously doped rod. In conjunction with experimental evidence, the paper illustrates that, for pump powers below 200 W the amount of birefringence is comparable for both laser rods     

115-W Tm:YAG diode-pumped solid-state laser

A compact diode-pumped Tm:YAG laser capable of generating greater than 100 W of CW power at 2 μm has been demonstrated. A scalable diode end-pumping architecture is used in which 805-nm radiation, coupled to the wing of the Tm³⁺³H₆-³H ₄ absorption feature, is delivered to the end of the laser rod via a lens duct. To facilitate thermal management, undoped YAG end caps are diffusion bonded to the central doped portion of the laser rod. For 2% and 4% Tm-doped rods of the same length, the lower doping level results in higher power, indicating that cross relaxation is still efficient while offering lower thermal stress and reduced absorption at the laser wavelength. Output powers for various output coupler reflectivities are compared to the predictions of a quasi-three-level model. Thermal lensing, cavity stability, and stress-induced birefringence measurements are described. The beam quality was analyzed with the 2% Tm-doped rod and a flat output coupler, yielding M² values of 14-23