Increase in laser repetition rate by spectral selection

An experimental and theoretical study into the use of Fabry-Perot etalons as static repetition rate upconverters outside the laser cavity is discussed. It is shown that the output repetition rate can be increased up to 12 times while maintaining high average power     

封闭式高重复脉冲铜蒸气激光

一、引言 铜蒸气激光具有高增益、高功率和高效率等特点,受到普遍的注意。最初的铜蒸气激光是用纯铜在氧化铝管中加热到1500℃而产生铜蒸气作为工作物质的。人们为了降低工作温度,找到了卤化铜作为工作物质,使激光的运转温度在400℃至600℃,而激光的功率仍保持不变。卤化铜激光最初是采用双脉冲工作方式,第一个放电脉冲产生卤化铜的分解,第二个放电脉冲则使铜原子在电子碰撞下激发到激光上能级。1974年,双     

氯化亚铜激光器泵浦的高重复率染料激光器

报道了用CuCl激光器泵浦的几种若丹明染料的研究结果,激光辐射复盖了从5630到6230约600的波长范围,最高转换效率达到33%.     

A pulse repetition frequency scaling law for the high repetition rate neutral barium laser

The variations in the output energy per pulse and in the average power output of the neutral Ba cyclic metal vapor laser as a function of the pulse repetition rate have been analyzed. At constant input power, the output energy per pulse is found to vary inversely as the two-thirds power of the pulse repetition frequency and so the average output power varies as the pulse repetition frequency to the one-third power up to the point where the Ba metastables do not have sufficient time to relax between pulses. Since the experiments which have been analyzed were conducted with a constant value for the laser discharge capacitance, these results imply that the output energy per pulse of this laser varies as the four-thirds power of the input voltage.     

Pulse nitrogen laser at high repetition rate

An output of 1.5 W of average power at 3371 Å is obtained from a pulsed nitrogen laser operating at a repetition rate of 1200 Hz. Pulse powers up to 300 kW are observed, with 10-ns pulse duration. The high repetition rate is made possible through the use of a closed-cycle transverse gas flow system to supply fresh ion-free gas to the laser for each pulse.     

高重频脉冲激光对CMOS相机饱和干扰效果研究

激光干扰是对抗成像观瞄设备和精确制导武器,保护己力目标的重要方式。为了评估激光对CMOS像传感器的干扰效果,利用1.06μm高重频激光开展了对CMOS相机的饱和干扰实验研究,实验中计算了CMOS图像饱和激光功率密度阈值,并分析了CMOS相机干扰有效面积、饱和干扰面积、干扰前后图像相关度与激光入射功率之间的关系。实验结果表明．随着激光功率的增加。CMOS相机饱和像元数、干扰有效面积增加,图像质量下降,干扰效果明显提高     

Excimer laser with high repetition rate for DUV lithography

The 248nm wavelength of the KrF excimer laser is the accepted tool for the production of structures in the range of 0.25μm. When going to below 0.20μm, the even shorter excimer wavelength of 193nm will be used. The demands on the laser source have changed over the last years for both the reflective and the refractive Step&Scan tools. The cost-effective operation of such lithography tool requires excimer lasers with high power and repetition rates of ≥ 1kHz. Precise dose control of the exposure requires high repetition rate and stability of the laser output energy.     

高重复率全光纤被动锁模飞秒激光产生研究

报道了高重复频率全光纤被动锁模飞秒激光产生的实验研究,采用全光纤环形腔结构和非线性偏振旋转可饱和吸收被动锁模机理实现了100MHz级掺铒光纤锁模飞秒激光的稳定运转,最高重复频率为99.91MHz,光谱带宽为25nm,中心波长为1570nm,脉宽最短为194fs,实验同时研究了在不同重复频率下的全光纤被动锁模激光器运转动力学特性。研究为高重复频率飞秒光纤激光器在光频梳产生技术中的应用提供了高集成、高稳定超快光源技术途径。     

高重复率脉冲可调谐染料激光器在光谱学上的应用

本文报道利用高重复率脉冲可调谐激光器作光源所进行的光谱实验,获得脉冲激光作用下Ne的敏化荧光光谱、Ne-Cu灯的光电流信号的时间积分谱及Kr-U灯的光电流光谱。     

一种大功率高重频脉冲激光电源的研究

基于半导体激光器的用电需求,针对传统BUCK恒流源技术和储能电容线性放电输出技术的不足,提出了一种新的大功率高重频脉冲激光电源实现方案.通过对相关电路及结构进行的电性能及热仿真分析以及两台工程样机与激光器负载的对接实验,表明所研究的脉冲激光电源具有高重频、大功率、高动态响应、高同步精度等特点,输出的脉冲电流宽度、重复频...     

Operating characteristics of a high repetition rate miniature rare-gas halide laser

Performance characteristics of a high repetition rate rare-gas halide minilaser are reported. At 1 kHz pulse repetition frequency over 1 mJ per pulse at KrF and 0.5 mJ per pulse at XeCl wavelengths are obtained. Net small-signal gains greater than 0.3 cm^-1are observed in XeCl. The wall plug efficiency is measured to be as high as 0.25 percent.     

二极管端面泵浦Nd∶GdVO4高重频声光调Q激光器

采用波长808 nm的光纤耦合输出LD为泵浦源,用Nd∶GdVO4作为激光增益介质,采用端面泵浦方式,通过谐振腔优化设计,达到良好腔模匹配,在LD注入功率20 W的情况下,实现1064 nm激光功率11.3 W的连续输出,光-光转换效率达到56.5%。插入声光调Q器件,通过合理设计腔内激光束腰大小及束腰位置,在重复频率30 kHz时,获得最大调Q输出功率9.2 W,峰值功率30.9 kW,同时,在此基础上,采用KTP晶体腔内倍频,在重复频率为30 kHz时,获得532 nm激光输出平均功率6.3 W。     

高重复率激光时间比对激光发射时序精确控制

我国空间站即将首次开展高重复率（~kHz）星地激光时间比对,搭载的星载探测器拟采用固定门控开启模式,对地面激光发射时序的控制提出了高实时、高重复率和高精度等要求。基于卫星激光测距（SLR）的距离门控原理,提出高重复率激光时间比对地面激光点火信号精确产生方法,以使上行激光脉冲能在门控信号之后短时间内到达星载探测器,极大减少噪声干扰。该方法可在单片可编程门阵列FPGA中实现,具有重复率大于10 kHz、控制精度5 ns以及软件交互简单等优势,结合方法计算精度和半导体泵浦激光器的纳秒级触发抖动,预计地面激光发射时刻精度最终控制在10 ns以内,满足空间站激光时间比对激光发射时序的控制需求,并可为其他激光时间比对工程的实施提供技术支持。     

高重频声光调Q掠入射激光器的掠入射角度优化

为了实现了高重复频率声光调Q运转,通过分析掠入射激光器中的等效抽运光模式,对掠入射激光器的掠入射角度进行了优化,获得重复频率大于2MHz的声光调Q TEM00基模的实验输出.理论分析和实验结果表明,掠入射激光器存在一个优化的掠入射角度可以获得尽量小的抽运光模式横截面积,有利于激光器获得高增益和实现高重频运转.     

高重复频率Nd:YAG锁模激光器及其热稳腔分析

本文报导高重复频率Nd:YAG锁模激光器。研究了腔内光泵感生的热透镜效应,分析了热稳腔的条件。设计了两种热稳腔结构,并给出实验结果。激光器最高工作频率为30脉冲/秒,输出模式是TEM_(00)模,序列能量～10毫焦耳,方向性～0.5毫弧度,最窄脉宽21微微秒。     

Argon pumped dye laser operation in the 690-700 nm region

A study of an argon pumped new red laser dye and mixture is reported for operation in the 690-700 nm region. Best reliability was achieved with the dye LD688.     

高重频风冷声光调Q光纤激光器实验研究

为了实现功率稳定的风冷高重频脉冲光纤激光器,采用主振荡功率放大结构,对声光调Q的全光纤激光器进行了研究.振荡级采用声光调Q方案,以光纤光栅对为激光器腔镜,915nm激光二极管连续抽运,得到了中心波长1064nm、重复频率10kHz到130kHz可调的激光脉冲输出.采用两级大模场双包层光纤放大,实现了平均功率101W、脉冲宽度328.1ns、3dB光谱宽度0.6nm的激光输出.第二放大级光光转换效率69%,激光器总光光转换效率达62.7%.分析了声光调Q产生的宽种子光脉冲经放大后发生波形畸变的原因.结果表明,采用915nm抽运波长提高了激光器输出激光功率稳定性,在风冷的情况下输出功率长期稳定性优于2%.     

高重复率TEA CO2激光器放电特性研究

本文介绍一种用于TEA CO2激光器的倍压电路和放电过程，对放电参数作了理论计算，给出了激光器运转时的E/N值和气体放电的电阻特性，并将理论模型与实验结果作了比较。     

Passively modelocked 832 nm vertical-external-cavity surface-emitting semiconductor laser producing 15.3 ps pulses at 1.9 GHz repetition rate

A passively modelocked 832 nm vertical-external-cavity surfaceemitting laser, producing pulses of a duration of 15.3 ps at a repetition rate of 1.9 GHz, has been demonstrated. A fast surface-recombination semiconductor saturable absorber mirror, with a bi-temporal absorption recovery characteristic, consisting of fast and slow time constants of 1.5 and 200 ps, respectively, was used to form the pulses.     

高重复率卫星激光测距中后向散射干扰及规避

大气后向散射对高重复率卫星激光测距（Satellite Laser Ranging,SLR）的回波接收产生干扰且随测量频率增加愈发严重,已成为制约SLR工作频率提升的关键因素之一。根据大气散射雷达探测方程,分析了探测系统接收到的大气后向散射光功率及对回波接收的影响,以上海天文台现有收发分离的SLR系统为平台,通过试验验证了分析的合理性;据此厘清后向散射干扰产生时序,给出基于激光发射时序控制的后向散射规避方法。通过在高重复率距离门控电路中添加激光点火信号产生模块,并实时判断后向散射干扰情况以控制点火信号是否延迟输出,基于FPGA（Field Programmable Gate Array）完成了后向散射自动规避电路,成功应用在上海天文台高重复率SLR的常规观测中,实现了对散射的完全规避,且对Lageos等重点激光卫星的平均点火频率下降率低于2%,具有很好的推广应用价值。