带状和片状微型晶体激光器

带状和片状微型晶体激光器最近十年的光电子学进展应归功于半导体二极管泵浦的光纤形和条形波导结构微型激光器的发展。微型激光器的发展和这种激光器工作介质的探索已成为近代量子电子学和激光晶体物理学的迫切课题。作者报导了两种由类云母斜方晶ＫＹ（ＭｏＯ４）２：Ｎ...     

边缘抽运片状激光器的性能

二极管抽运固体激光器在材料加工、医学、计量、遥感等领域的应用中得到迅速发展。其原因归结为它的高效率、衍射极限光束质量以及长寿命。紧凑结实的包装和低廉的维修要求从运转观点也使其成为诱人的激光源。结合非线性频率变换 ,此种激光器可占有紫外到中红外很宽的波段 ,并能在亚皮秒脉冲到连续态的很宽范围内运转。迄今 ,激光二极管的成本妨碍了二极管抽运固体激光器与 CO2 气体激光器及闪光灯抽运系统在需要高平均功率的应用中进行竞争。激光二极管的价格每年约以 30 %下降 ,根据某些估计 ,到 2 0 0 4年 ,其价格将降低至每瓦 1美元以…     

高指向稳定性的钕玻璃调Q激光器

本文讨论了激光束指向稳定性的重要意义,报导了调Q钕玻璃激光振荡器的指向稳定性优于20″/20天.     

单模片状激光器的极限空间相干度

单模片状激光器的极限空间相干度激光辐射的重要特性除了表征其光谱性质的时间相干性外，就是确定激光空间特性和辐射方向图稳定性的空间相干性。ｒ１和ｒ２两点间光辐射的空间相干度γ＝（ｓ＝ｒ１—ｒ２）由下式确定式中Ｅ（ｒｉ）—点ｒｉ（ｉ＝１，２）的电场的复振幅...     

Static gas conduction cooled slab geometry Nd:glass laser

We report on the first demonstration of a 10 Hz static gas cooled slab geometry Nd:glass laser. This cooling approach provides thermal control of the slab laser medium while eliminating mounting and optical problems associated with liquid cooling.     

液体冷却大面泵浦板条激光器的波前畸变研究

固体激光器中热效应引起的波前畸变影响了高光束质量,高功率的激光输出,限制了它在当代工业加工和科学研究领域的应用发展。以激光波前畸变的产生机理和液体冷却大面泵浦板条激光器的优势为切入点,利用哈特曼-夏克波前探测器进行一系列的波前畸变测试,通过对静态波前畸变量和动态波前畸变量等结果进行数据分析,对影响结果的因素进行分析,并提出改进意见,以期望进一步减少液体冷却大面泵浦板条激光器的热效应。     

非轴对称腔板条固体激光器

本文使用复曲率张量Q-1自再现法分析了柱面-球面镜非轴对称腔的特性,并用数值计算例说明。报导和讨论了我们的非轴对称腔板条固体激光器的实验结果。     

Deviation of the Frantz-Nodvik equation for zig-zag optical path,slab geometry laser amplifiers

In slab-geometry laser amplifiers with zig-zag optical paths, multiple reflections within the slab cause the extracting optical beams to repeatedly fold over themselves. Because of this, some regions of the slabs are extracted by two overlapping beams. The theory for pulse propagation in laser amplifiers by L.M. Frantz and J.S. Nodvik (see J. Appl. Phys., vol.34. no.8, p.2346-9, 1963) is extended to include the effects of the zig-zag optical path. Simple equations for slabs which are either uniformly filled by the extracting beam or partially filled are derived. Extraction with spatial beam modulation due to interference is also examined     

高功率端面冷却片状Yb:YAG激光器水冷结构设计

为了实现高功率Yb:YAG激光器的高效冷却,对大口径片状Yb:YAG激光器的水冷结构进行了设计,采用有限元方法对该结构的传热效果进行了数值模拟,得到了该结构的表面对流传热系数、换热面的温度分布等参量。结果表明,该设计可以得到均匀的传热系数分布和温度分布,传热系数达到1.8104W/(m2K),介质表面温差在1K以内,换热效果良好。     

The slab geometry laser-II: Thermal effects in a finite slab

This paper presents two methods for calculating the thermally induced stress, focusing, and depolarization in a pumped zigzag-slab solid-state laser. A computer program capable of detailed calculations of thermal effects in the general case is described. An approximate analysis of slab thermal effects in many cases allows calculation of these effects without use of the computer model directly. The analysis predicts that slabs of square cross section can be designed to have low depolarization and thermal focusing compared to Nd:YAG laser rods.     

用于远程激光测距机的板条激光器

研制了用于远程激光脉冲测距机的板条激光器。使用半导体泵浦的MOPA激光结构实现了大于250 mJ的脉冲激光输出,输出脉冲宽度为12.83 ns,最终输出激光光束束散角为0.18 mrad。该激光测照器可应用于远程激光测距。对激光测距机的测距与照射能力进行了理论计算与分析。理论分析表明,应用于机载平台时,该激光测照器能够实现50 km距离的激光测距。该型激光测距机具有测距距离远,重量轻,结构紧凑等特点,具有广泛的应用前景。     

A laser gyro with optimized resonator geometry

Experiments on laser gyros with adjustable beam path geometry yield a strong dependency between the lock-in threshold and the distribution of the backscatter sources. Based on a simple vector formalism, a theory is presented which describes the lock-in threshold as a function of the beam path geometry. In accordance with the experimental results, the theory is a helpful tool to minimize the lock-in threshold by an optimization of the resonator geometry. The theory also offers an explanation of the fact that the quality of laser gyros often differs, even between gyros of the same production series, under the same operating conditions and with mirrors of comparable quality.     

A novel wide-angle low-loss dielectric slab waveguide Y-branch

A new Y-branch structure for dielectric waveguides is proposed and analysed using simple geometrical optics and beam propagation methods. It is shown both qualitatively and quantitatively that the proposed structure has larger branching angles but lower radiation loss than those associated with either conventional Y-branches or structures with antenna coupled and phase front accelerators. The optimal design parameters calculated by numerical simulations are in very good agreement with those found from the geometrical optics. The simulations also reveal that the performance is fairly insensitive to fabrication errors