双波长稳频CO_2激光

本文的研究结果和现行的CO_2激光的稳频方法有较大不同,它只有一个P-P线对,不但有永久固定的线序(signature),而且可以在四个运转频率中快速地成对切换。此四个工作频率分属两个波长,每个波长的频率稳定度都在10~(10)量级,由四个工作频率形成的二级合成波长可达到米级。这对于无导轨的绝对距离干涉计量学极有意义。     

A 20-J flow-compatible XeCl laser

The laser head and fast pulser for a high-energy, flow-compatible, X-ray preionized XeCl laser have been fabricated and tested. The pulsed power used to drive the 12*9*120 cm discharge utilizes a novel high-efficiency spiker sustainer circuit with a magnetic isolation switch. A single-pulse output energy of 19 J at 2.2% efficiency and a pulse length of 230 ns has been demonstrated, corresponding to an extracted energy density of 1.5 J/L.<>     

紫外光预电离闭合循环系统的XeCl准分子激光器

激光器采用集总电容的LC快放电网络。主放电电极由一对铝合金电极组成,间距2厘米。其中一电极面形曲率R=1.5厘米,另一电极R=1厘米。二排由24组火花隙组成的紫外预电离针平行均布于电极二侧,总有效激活长度为72厘米;激光器谐振腔长为100厘米,全反端为镀铝平镜,输出端为GaF_2窗口。总锗能电容量为67000微微法总预电离电容为18720微微法。闭合循环系统采用金属真空系统与循环泵组成。 在电压34千伏,He:Xe:HCl=94.8％:4.7％:0.5％的配气比中,激光器输出能量大于110毫焦耳,脉冲前沿小于10毫微秒;脉宽40毫微秒。以80毫焦耳能量为起点,运转6×10~4次后能量下降50％。     

自动预电离的XeCl准分子激光器

一、前言 由于准分子激光器在光化学,同位素分离、激光生物效应、微电子学,遥测及其他科技领域内日益广泛的应用的要求,准分子激光器的输出能量及效率的提高是大家普遍关心的一个问题。     

小型长寿命XeCl准分子激光器

报道了一种改进电晕预电离结构的小型XeCl准分子激光器的工作参数和寿命的研究结果.     

循环流动XeCl准分子激光器

本文报导循环流动XeCl准分子激光器,每更换一次气体可连续工作8小时。重复频率2次/秒,平均功率80毫瓦。     

50 J discharge-pumped XeCl laser

An X-ray preionized XeCl laser with a wide aperture of 10×10 cm² is described. The density for preionization electrons is estimated from an X-ray energy distribution to be greater than 6×10⁹ cm^-3 under operational gas conditions. In high pressure operation at 4500 torr, sufficient preionization has led to successful discharge-breakdown at a low E/N of 6.4×10^-17 V-cm², resulting in a high electrical efficiency of 3.1% with an output energy of 17.6 J. An output energy of 50 J in an 85-ns (FWHM) optical pulse has been extracted from an active volume of about 10:1 for a pulse-forming-line (PFL) voltage of 400 kV. The effects of impedance transformation of a pulse-transmission-line (PTL) following the PFL have been investigated using two types of PTL with output impedances of 0.26 and 0.48 Ω     

308毫微米XeCl激光泵浦C_(102)染料激光的研究

报道用308nm XeCl准分子激光泵浦香豆素C_(102)染料可调谐激光的实验研究.调谐范围从4605 到5010,调谐线宽～1.     

简单紧凑的电晕预电离XeCl准分子激光器

本文报导了一台电晕预电离XeCl准分子激光器的实验研究,输出最大脉冲激光能量超过250毫焦耳。研究了各种放电参数对输出激光能量的影响。     

Optoelectronic exclusive-NOR gate operating at 200 mbit/s

An optoelectronic exclusive-NOR gate was demonstrated for the first time. The device consisted of a composite pair of GaAs metal-semiconductor-metal photodetectors. Special input pulse trains were constructed from a 0.83 μm laser diode to test its functionality. Output electrical signal shorter than 800 ps was achieved. On-off contrast ratio of 6.2 dB was obtained with an incident pulse energy below 100 fJ. The device is useful in bit pattern matching for optical signal processing and optical computing     

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。     

A lead bromide laser operating at 722.9 and 406.2 nm

A self-heated laser, operating on the atomic lead transitions at 722.9 and 406.2 nm is reported. The free lead atoms were produced by electric-discharge dissociation of lead bromide which was generated in situ by flowing a Ne-HBr gas mixture over molten Pb in the laser tube. The experimental technique may be applied readily to a number of metal-vapor lasers. Also reported is stable high-PRF operation on the 406.2 nm transition of lead     

XeCl激光泵浦超短腔染料激光器

用脉宽15～20ns的XeCl准分子激光脉冲泵浦可调腔长的R6G超短腔激光器,得到的输出脉宽压缩了15～20倍;输出脉宽随泵浦光斑大小及能量的变化,得到与以前不同的结果。     

XeCl激光泵浦的ns染料激光器

报道了以XeCl准分子激光作泵浦源,通过所谓的“控制腔瞬态过程”的方法,直接获得ns染料激光脉冲的实验结果。与N_2光泵浦比较,XeCl激光泵浦可得到更短波长和更高阈值系统的激光振荡。     

XeCl laser power enhancement with an external ultraviolet laser

Enhancements in the output energy of an XeCl laser of more than 50 percent have been observed by injecting 2-43 mJ of 308 nm laser radiation into the resonator 10-150 ns prior to the emergence of the final XeCl pulse. This effect is a strong function of the time delay (Deltat) between the two lasers and is most pronounced when the injected (external) pulse precedes the XeCl laser pulse by 45 ns. For|Deltat| lsim 100ns, the external radiation appears to be simply "seeding" the XeCl laser cavity which allows the second laser to reach threshold earlier and thereby improve its extraction efficiency. For100 lsim |Deltat| lsim 150ns, the enhancement may to arise from the depletion of the number density of an impurity molecule which absorbs strongly at 308 nm.     

A microprocessor stabilized submillimeter laser system

A mechanically and thermally stable submillimeter laser has been constructed and has an amplitude and frequency stability suitable for use as a local oscillator in a heterodyne receiver for astronomical investigations. The microprocessor stabilization reduces the receiver noise for different kinds of Schottky barrier diodes used. A short-time amplitude stability (10 minutes) of about ±0.5% and a long time amplitude stability (1 hour) of about ±1.2% have been recorded. Integration times up to one hour with a spectral resolution better than 200 KHz are possible with such a stabilized system.     

308mn激光辐照猪皮肤损伤阈实验

XeCl气体准分子激光波长为308nm,脉冲宽度50～100ns,峰值功率20MW.实验动物为白色幼猪,共照射203个有效样点,分成5个剂量组,各组照射剂量为38.8～134.3mJ/cm2.相应红斑发生率为11.8～98.0%.用迭代加权回归Bliss法统计,MRD50的剂量为73.03mJ/cm2.     

Improved performance of the microwave-pumped XeCl laser

Significant improvements in pulse length (200 ns), output power (500 W), and repetition rate (400 Hz) of the microwave-pumped XeCl laser are reported. Efficient coupling of microwave power into Ne at pressures up to 17 atm has been demonstrated.     

Simple long-pulse XeCl laser with narrow-line output

Long-pulsed operation of a capacitive transfer driven XeCl laser using inductors has been demonstrated with no degradation of the laser performance. Spectral narrowing to a 0.003 Å bandwidth with an output energy of 4 mJ was also achieved using a grating and etalon combination.     

采用磁压缩器的XeCl准分子激光器

研究了采用磁压缩器的XeCl准分子激光器特性。采用这种技术可将电流脉冲上升时间从200ns压缩到50ns,计算了电流脉冲的增幅和压缩现象,并解释了反向电流幅度减小的原因;给出了旁路电感对压缩效果的影响。