Output spectra of the argon ion laser

The output spectra of an A+ laser in its λ 4879.90 Å transition has been observed at various levels above threshold, in a ring resonator, a two-mirror resonator of the same longitudinal mode spacing (107 Mc/s), and another two-mirror resonator of about three times that mode spacing. Oscillations were restricted to the fundamental (Gaussian) mode. The A+ laser spectra display three novel features, hitherto unobserved in the oscillation spectra of neutral-gas lasers [17], which appear to stem, at least in part, from its large natural line width: 1) At moderate levels above threshold, the spectra are extraordinarily stable, and usually characterized by gaps of many mode spacings between oscillations. 2) Above a critical level, oscillations occur in random sequence at all resonances, with violent amplitude fluctuations at each frequency. 3) The time-average envelope of the unstable "multimode" oscillations exhibits three well-defined maxima, which give way to a single maximum at a higher excitation level. The line shift of the laser transition has been measured to within about 10 percent, by comparing oscillation frequencies at the center of symmetrical spectra in the two counter-circulating waves of the ring laser.     

High-power single-frequency argon ion laser

Single-frequency oscillation has been obtained from an Ar laser of increased power level with the help of a three-mirror Smith reflector (power in the 4880-Å line was 2 watts). Equations and plots that permit the choice of optimum parameters of the three-mirror reflector are given. It is shown that for effective frequency selection in a high-power laser of great length it is necessary to use beam splitter reflectivities exceeding 0.5. Single-frequency lasers of this type may be used in holography.     

CW ruby laser pumped by an argon ion laser

A simple CW ruby laser pumped by a 514.5-nm argon ion laser, utilizing an uncoated ruby rod (no external mirrors), is described. The output does not exhibit spiking, but does show a low amplitude ∼1 percent) of modulation.     

A high-power pulsed xenon ion laser

Over 80 kW of peak power has been obtained on the combined visible lines of a pulsed xenon ion laser. Light pulse shapes of the strongest lines are discussed.     

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.     

连续锁模Ar~+激光器的噪声特性

本文从时域特性出发,分析了锁模Ar~+激光器中噪声的来源,假设表征光脉冲强度涨落的随机函数为A(t)=A_oexp[-i(Ωt+(?)_t)],得到描述光强涨落的噪声谱为罗仑兹线形,这与实验结果是一致的.     

Output power characteristics of erbium-doped fiber ring lasers

The output power of an erbium-doped fiber ring laser has been measured as a function of pump power, emission wavelength, doped-fiber length, and reflectivity of the output coupler. A theoretical model for the calculation of the output power is introduced that is based on a previously derived gain equation for erbium-doped fiber amplifiers. The calculated values are in good agreement with the experimental data, confirming the applicability of the theory to a reliable modeling of the output power of erbium fiber ring lasers     

端面泵浦掺镱双包层光纤激光器功率输出特性研究

基于端面泵浦掺镱双包层光纤激光器的速率方程,应用MATLAB语言编程,分别数值模拟了功率为60瓦前端泵浦、后端泵浦和双端都为30瓦泵浦时掺镱双包层光纤激光器对应的功率输出特性和粒子数密度值特性,增大不同端面输入功率观察输出功率特性,研究得到后端泵浦上能级粒子数分布平坦,输出功率较大,为50.4705瓦。并且增大输入功率时得到双端泵浦输出功率较大。研究结论为提高掺镱双包层光纤激光器功率输出提供理论和实验参考。     

Near-infrared operating characteristics of the mercury ion laser

Experiments on the pulsed mercury-helium laser have revealed a new line at 7418 Å. The laser was examined specifically with regard to operation at 7945 Å, and it was found that the optimum He pressure is 30 torr. The high optimum pressure implies that collision mixing helps to populate the upper state.     

脉冲激光电源中电流可编程的实现

本文介绍了一种用于脉冲激光电源的新型电流可编程控制操作系统。该系统采用上下位机的方式实现电流波形的输入、显示、存储及D/A输出。就系统的实现给出了硬件框图、软件流程图以及部分源程序。     

Measurements of a mode-competition discriminant in a single-frequency argon ion ring laser

We have built a single-frequency argon ion ring laser using a coupled-cavity mode selector. Utilizing the gain asymmetry caused by the drift velocity imparted to the argon ions by the dc field used to excite the discharge, we have obtained a narrow discriminant centered on the argon laser line. This discriminant could be used to stabilize the laser to the center of the atomic line. We have measured discriminant widths of less than 200 MHz for the argon 4880-Å resonance line. The sensitivity of this discriminant is compared with other laser stabilization systems described in the literature, and it is shown that our system appears to be the most sensitive of the systems currently available for stabilizing the argon ion laser.     

Output power saturation of BH laser under high current operation

Output power saturation of BH lasers under high current operation is analysed and it is concluded that such saturation is due to increase of leakage current through the burying layers. The mechanism of such leakage can be explained by a turn-on model of the bipolar transistor around the active region.     

YAG脉冲激光电源硬件电路的设计

深入分析了YAG脉冲激光电源的工作原理,根据氙灯特殊的电气特性,设计了硬件电路和软件程序。采用MOSFETS场效应管半桥逆变器,以SG3525为驱动的PWM技术的电源设计,针对氙灯泵浦YAG激光器对驱动源的要求,研制了YAG脉冲激光电源,并提高了开关频率,大大减小了电源的体积和重量。电源在实际运行中稳定可靠。     

脉冲空心阴极He-Kr Ⅱ激光器工作特性的研究

人们已在脉冲辉光放电、连续HCD和HAC中获得了469.5nm He-KrII激光振荡,最近Janossy等人又研制出了长寿命连续HAC He-KrII激光器.我们在前人工作的基础上采用了脉冲HCD泵浦方式,较详细地研究了这种器件的工作特性.     

基于MOPA结构的高功率线偏振脉冲Yb光纤激光器

介绍了基于Nd3+:GdVO_4声光调Q激光器种子源和大直径Yb双包层保偏光纤作为放大介质的高功率线偏振脉冲光纤激光器.一个工作波长为808 nm的半导体激光器端面泵浦的、声光调Q的Nd3+:GdVO_4激光器输出重频在20～50 kHz、平均功率约3 w的高光束质量的1063 nm波长的激光,经过光学耦合系统和光学隔离器进入大直径Yb双包层保偏光纤作为光纤放大器的种子源,在波长为975 nm的半导体激光器泵浦下,光纤放大器获得了近衍射极限的、平均功率超过20 w、偏振抑制比超过14 dB的高功率线偏振脉冲激光输出.     

Continuous-duty argon ion lasers

The problems associated with the construction of continuous-duty dc excited ion lasers are indicated. Two solutions to the thermal dissipation and ion bombardment problem which have been experimentally tested and appear promising are described. These involve the use of axial magnetic fields with high current, low pressure, constricted arcs in large bore tubing and the use of metal-walled discharge vessels. The influence of an axial magnetic field on the properties of an ion laser is discussed, and the optical power levels which have been obtained are given.     

用单片机实现脉冲固体激光电源双路输出

本文简要介绍了脉冲固体激光电源的组成 ,通过对放电回路的改进 ,实现了一个电源两个放电回路的交替工作。在泵浦电压 10 0 0V ,重频 2 0Hz,双路Cr,Tm ,Ho :YAG激光器光纤末端输出功率 2 2 .7W。