隔环结构的Ne H2 CuBr激光放电管气体温度径向分布

针对溴化亚铜激光器中放电管径向温度不均匀现象，在工程设计中同时采用隔环结构放电管设计方案和溴化亚铜激光放电管充氢方案。对隔环结构及隔环结构同时充氢的CuBr激光放电管温度场进行了分析。利用简化的热流耗散泊松方程，给出了激光放电管内温度场分布的数学模型，获得了激光放电管气体温度场径向分布的解析表达式，明确了温度分布与输入电功率及缓冲气体热传导系数之间的关系，得到了与实验一致的结果，为该类激光器的实用化提供了理论分析依据。     

锶离子R—M跃迁激光和复合激光的参量研究

在9mm内径和42cm电极间距的石英放电管中，用氦气为缓冲气体，通过纵向快脉冲放电激励，对锶离子红外R—M跃迁激光和蓝色复合激光进行了系统的参量研究.分析和解释了两种谐振腔时各激光谱线输出功率与工作参量（氦压，频率和充电电源电压）的关系曲线，观察和讨论了对应的光电脉冲波形，获得了一组较好的工作参数. 关键词： 脉冲放电激励 锶离子 R—M跃迁激光 复合激光 光电脉冲波形     

高频H型放电离子源的场特性

 从Maxwell方程组出发，推导了高频H型放电离子源放电空间的场分布, 并采用Mafia软件进行了三维实体建模，计算了高频离子源放电击穿前和稳定工作后的电磁场分布，得到了高频离子源放电空间电磁场分布的直观图像。通过比较击穿前高频电场的轴向和环向分量，得出了轴向电场在高频离子源击穿中起主要作用的结论，并进而推导出了高频离子源的击穿判据，得出了气体击穿时离子源击穿电压和放电管内气压的关系，与实验结果符合较好。     

CuBr脉冲激光动力学模型及其研究

本文通过实验观测CuBr激光等离子体中铜的自发辐射光谱,建立了五能级CuBr脉冲激光动力学模型。应用电子温度和电子密度实验值,通过计算机数值计算得到的激光脉冲波形、峰值时刻、功率等都与实验值基本相符。结果还表明:当输入功率密度不变时,通过改变缓冲气体热扩散步长,可明显改变气体温度或初始铜原子密度,从而改变激光功率。 关键词：     

激光器件 气体激光器

TN248.2 2004053362 用于CuBr激光器的一种新型激励电路=A novel excitation circuit used for CuBr lasers[刊,中]/陈钢(浙江大学物理系。浙江,杭州(310027)),潘佰良…∥光电子·激光。—2003,14(11)。—1142-1145 设计并实验了一种新型相互作用电路,使CuBr激光的输出功率和效率提高了近1倍。对一般电路和相互作用电路的放电特性以及光电脉冲波形进行了实验比较和     

CuBr自锁模激光器的实验研究

首次报道在纵向放电的CuBr激光器中,通过抑制高阶横模的振荡,同时得到高度稳定完全调制的绿光和黄光自锁模脉冲串,并在实验上研究了高阶横模,泵浦功率和谐振腔腔长对CuBr激光自锁模脉冲串及其纵模频谱的影响.     

问与答

<正> 什么是激光光电流效应?激光光电流效应有哪些应用? 当用激光照射气体放电管时,如果激光的频率和参与放电的粒子(原子、分子、离子)的某两个能级之     

带轴向温控仪的金属蒸气激光管径向温度场分析

对带轴向温控仪的金属蒸气激光放电管,建立了描述放电管径向温度场的简单数学模型.给出了由热辐射和热传导引起的径向温度变化的解析表达式,计算分析了轴向温控仪对激光管管壁温度和径向温度分布的作用机制.结果表明轴向温控仪可在一定范围内独立调节放电管管壁温度和减小激光管的径向温度梯度,可有效提高激光器运转效率和稳定性.     

轴对称折叠组合腔CO2激光器的实验研究

对轴对称折叠组合腔CO2激光器进行了相关的实验研究。主要用线图的方式研究了在两种不同混合气体比例条件下,输出功率与放电电流之间和输出功率与放电气压之间的关系。引入辅助气体xe后,输出功率有很大的提高,能够达到35％左右。根据模型结构的实际参数,运用数值计算的方法模拟画出其输出光强和光斑分布图。以三维5根、7根和9根放电...     

电泳式He-Sr+复合激光特性研究

设计制作了7mm内径和38cm有效激励长度的电泳式He-Sr⁺激光管,采用修饰Blumlein电路,通过纵向高重复率脉冲放电激励,实现了一价锶离子复合激光430.5nm和R-M跃迁激光1.03μm的同时振荡,其中复合激光占主要成分.测量分析了复合激光输出功率与工作参量(脉冲频率,充电电源电压和氦压)的关系曲线.获得了最大激光功率819mW和56mW/cm³功率密度的实验结果. 关键词： 锶离子激光 电泳 脉冲放电     

Inverse problem in acoustoplasma

Using an experimentally obtained shape of distribution of the optical emission along the discharge tube an attempt is made to determine working and independent parameters of the acoustic oscillations and acoustoplasma by means of solving the inverse problem.     

Effect of perturbations in an active medium on the instability of the difference frequency of laser radiation

A frequency-stabilized helium-neon laser with Zeeman frequency splitting in the magnetic field was studied. A series of pulses with repetition frequency equal to the frequency difference caused by the splitting of the gain profile by the magnetic field was used as a reference signal for a laser interferometer. The modulation of discharge current by electric noise or natural oscillations of the discharge current were found to lengthen the edges of these pulses, which decreases the accuracy of measurements with a laser interferometer.     

Alternate oscillations of self-terminating and recombination lasers in univalent calcium and strontium ions

The univalent calcium and strontium ions have been confirmed as ideal lasing substances both for self-terminating laser and recombination laser by theoretically analysing their energy level structures and lasing mechanisms. With the optimization of the excitation circuit and the improvement of the laser cavity as well as the laser discharge tube, thealternate laser oscillatlons of the two laser mechanisms were suceessfully realized by longitudinal pulsed discharge in mixture vapours of helium and univalent ions of calcium or strontium, respectively. The dependences of laser performance on working parameters, together with the characteristics of the photoelectric pulse waveforms were elementally studied and analysed.     

微管内气泡的受迫振动

在气泡-液柱一维耦合振动模型的基础上对刚性微管两侧声压不相等时管内柱状气泡的轴向一维受迫振动进行了理论探索. 声压不均匀分布不影响气泡线性振动时的共振频率, 但振动幅度受到有效声压幅值的影响. 利用逐级近似法分析了管内非线性振动气泡的基频、三倍频和三分之一分频振动的幅-频响应关系, 结果表明当驱动声压超过0.1 MPa时, 气泡振动处于非线性状态. 非线性声响应特征主要表现为:基频和分频振动幅值响应的多值性; 三倍频振动在低频区响应强于高频区; 三分频振动在大于共振频率的频域内出现的概率更大.     

钙原子与离子共振-亚稳跃迁激光的同时振荡

在电极间距为46cm、内径为1.3cm的石英放电管中,通过高频纵向脉冲放电激励,获得波长为0.85μm/0.87μm和5.54μm的钙离子和原子共振-亚稳跃迁激光的同时振荡.最大激光总功率和效率分别达1.1W和0.1%.测量并分析了激光输出特性和各工作参量之间的关系.     

Violent folding of a flame front in a flame-acoustic resonance

The first direct numerical simulations of violent flame folding because of the flame-acoustic resonance are performed. Flame propagates in a tube from an open end to a closed one. Acoustic amplitude becomes extremely large when the acoustic mode between the flame and the closed tube end comes in resonance with intrinsic flame oscillations. The acoustic oscillations produce an effective acceleration field at the flame front leading to a strong Rayleigh-Taylor instability during every second half period of the oscillations. The Rayleigh-Taylor instability makes the flame front strongly corrugated with elongated jets of heavy fuel mixture penetrating the burnt gas and even with pockets of unburned matter separated from the flame front.     

Resonance method of measuring shear viscoelastic properties of liquid media based on excitation of torsional oscillations in tubes

Possibilities of using torsional oscillations for measuring viscoelastic properties of liquids are discussed. The theory of torsional oscillations of an elastic tube filled with the media to be investigated possessing viscosity and shear elasticity is developed. It is shown that to determine a complex shear modulus it is sufficient to determine the resonance frequency and Q-factor of torsional oscillations. An experimental installation and the results of measurements of viscoelastic modulus of glycerin and oil of one oilfield within the temperature range from −10° to 60°C are given. The experimental installation allows measuring a viscoelastic modulus within the range of acoustic logging frequencies (10–20 kHz). The obtained results are compared with the results of rheometric measurements.     

Structural properties of complex plasmas in a homogeneous dc discharge

We report on the first three-dimensional (3D) complex plasma structure analysis for an experiment that was performed in an elongated discharge tube in the absence of striations. The low frequency discharge was established with 1 kHz alternating dc current through a cylindrical glass tube filled with neon at 30 Pa. The injected particle cloud consisted of monodisperse microparticles. A scanning laser sheet and a camera were used to determine the particle position in 3D. The observed cylindrical-shaped particle cloud showed an ordered structure with a distinct outer particle shell. The observations are in agreement with performed molecular dynamics simulations.