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     

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.     

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     

Output characteristics of a cataphoresis He–Sr recombination laser

A cataphoresis discharge tube of 7 mm inner diameter and 38 cm active length was designed and made for the He–Sr⁺ laser. The cataphoretic input of uniform distribution of strontium vapor concentrations along the active region was realized by the cataphoresis effect and the slow flowing (0.5 nl/h) of helium buffer gas. The strontium ionic recombination laser at 430.5 nm and the R–M transition laser at 1.03 μm were obtained with the modified Blumlein circuit by high-frequency longitudinal pulsed discharge. The laser components are concentrated on the 430.5 nm wavelength. Dependences of working parameters such as the pulse frequency, the supply voltage, and the helium pressure on laser output characteristics were measured and discussed. The maximum laser output power of 819 mW and specific power of 56 mW/cm³ were obtained, respectively.     

IC-excited strontium recombination laser

An IC-excited Sr⁺ recombination laser, operated successfully at average powers of 0.8 W-1 W, is reported. The IC-circuitry practically eliminates the detrimental ringing of the tube current and ensures tripling (or more) of the rectifier voltage to be imposed on the tube electrodes.     

Control of radiative recombination by a strong laser field

Strong-field laser-assisted radiation recombination is investigated: (a) to explore the control possibilities with two laser fields having commensurable frequencies and (b) to get some insight into the influence of the medium (a plasma) in which recombination occurs. It is found that by varying the relative phase of the two fields it is possible to control enhancement, broadening and symmetry properties of the recombination differential emitted power. In the case of an anisotropic two-temperature plasma, an interesting interplay is found between the shape of the laser-modified electron velocity distribution function and the shape of the emitted X-ray photon power spectrum. The novel features of strong laser-assisted radiative recombination are mostly restricted to the region of the process parameters corresponding to the physical situation when the characteristic electron velocities (translation, quiver and thermal) are comparable. A classical picture allows a fairly good understanding of the process. PACS 32.80.Wr; 34.80.Lx; 34.50.Rk     

A pulsed ion-ion recombination laser

A new mechanism of pulsed laser oscillation based on ion-ion recombination is proposed. The advantages of utilizing this mechanism in a pulsed mode are considered, and the expected characteristics of the proposed lasers are estimated.     

Electron-ion recombination in a helium plasma produced by laser

Experimental investigation of the recombination coefficients in a helium plasma produced by laser is reported. The relative contribution of electronic collision processes and of atomic collision processes on the values of the recombination coefficients are pointed out according to the value of the neutral pressure of helium.     

复合X射线激光空间特性的研究

本文研究了类锂硅离子和类钠铜离子两种复合X射线激光的增益空间分布,结果表明复合X射线激光的增益出现在离靶面一定距离的中等等离子体电子密度区,而近靶面高密度区存在自吸收现象.     

掺Yb3+光纤激光器的特性与设计

 从速率方程出发，对波长为980nm的激光泵浦掺Yb^{3+光纤激光器进行数值模拟，全面分析激光器阈值功率、输出激光功率、增益等重要参数与泵浦功率、光纤长度、腔镜反射率、掺杂浓度等参量之间的关系。采用高浓度掺Yb3+光纤对环形光纤激光器做了初步实验研究，所得结论与实验模拟结果基本一致。}     

Combined trap for laser stimulated recombination

We present a combined Paul-Penning trap to study CO₂ laser stimulated recombination of protons and electrons. The trap is located in the center of an optical resonator for 11 μm radiation. In this manner the available laser intensity is enhanced for stimulated recombination to the n=1 state of hydrogen. This revised version was published online in August 2006 with corrections to the Cover Date.