A 60-W high-beam-quality single-oscillator copper vapor laser

We report dramatic improvements (up to four times) in the generation of high-beam-quality (HBQ) output power from copper vapor lasers (CVLs) by using tailored HCl-H₂-Ne buffer gas mixtures. Up to 60 W of HBQ power was obtained from a 38-mm bore-diameter CVL at a pulse repetition frequency of 12 kHz and 50 W at 22 kHz. This improvement in power capability is attributable to the modification of the spatio-temporal gain characteristics of the laser when using the new buffer gas mixture     

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.     

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。     

Output characteristics of a corona-preionized XeCl laser

The output characteristics of a corona-preionized XeCl laser are described. Measurements in an He-based mixture up to 5 bars and in an Ne-based mixture up to 10 bars are presented. The maximum obtained output energy per unit volume is more than 9 J/l.     

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。     

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.     

Waveguide laser resonators with a tilted mirror

We present a multimode theory of square-bore waveguide laser resonators with one well-aligned and one tilted plane mirror. Our theoretical results for mode content, resonator loss, and power output agree reasonably well with experimental results from an RF-excited CO2laser with a376 times 1.5 times 1.5mm Al/Al2O3waveguide. The mode propagation coefficients of this structure are discussed. We model a diffraction grating as a plane mirror with a wavelength-dependent tilt, and conclude that previous single-mode theory has underestimated the severity of the line-hopping constraint on tunable waveguide CO2laser performance.     

Active mode locking of a microwave-pumped XeCl laser

Acoustooptic mode locking of a long-pulse microwave-pumped XeCl laser has resulted in trains of ∼ 320 ps long pulses having very high contrast ratios.     

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     

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。     

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.     

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.<>     

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。     

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％。     

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。     

Erbium-ytterbium waveguide laser mode-locked with a semiconductorsaturable absorber mirror

Picosecond pulses are produced using a semiconductor saturable absorber mirror in a laser based on an Er-Yb codoped planar waveguide amplifier. Continuous-wave mode-locking (CWML) with 9.8-ps pulses is obtained at repetition rates up to 100 MHz. With intracavity spectral filtering, saturable pulsewidths of 1 ps are achieved, and tunable picosecond pulses are obtained from 1534 to 1553 nm. Absorber characterization suggests that two-photon absorption within the saturable absorber mirror influences the CWML stability     

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.     

LDA侧泵Nd玻璃的高光束质量激光放大器研制

研制了一台高光束质量、高稳定的基于激光二极管阵列(LDA)侧泵Nd玻璃的纳秒方形激光脉冲放大器。为了获得较高的输出能量,采用LDA泵浦的"串联式双程放大"高增益组件进行能量放大。同时,为了获得高光束质量的光斑,利用液晶空间光调制器(LCSLM)对光束近场分布进行空间整形,以便得到超高斯平顶分布的光束,并对后级放大器增益不均性进行预补偿,最终得到了光束口径为Φ13mm、光束近场调制度小于1.22∶1的激光输出。放大器工作波长为1 053nm,当注入500nJ的3ns方形激光脉冲时,得到无脉冲畸变激光脉冲能量为100mJ、能量不稳定度为2.14%(均方根)和远场角漂移小于11μrad的高光束质量激光输出。     

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。