Principles of Dye Laser Operation and Dye Laser Tuning Methods

Organic dye lasers have proved to be a high-intensity source of monochromatic radiation that can be tuned to any desired wavelength in the visible range of the spectrum. In this contribution the basic principles of dye laser operation are treated within the model of a suitably modified four-level laser, described in the rate equation approach. The tuning methods based on dispersion by prisms, diffraction by gratings, interferometric effects and polarization effects are discussed. In addition, examples of dye lasers, which are rapidly tunable or which emit simultaneously two or more wavelengths, and some interesting properties of ring lasers are presented.     

5GHz主动锁模光纤激光器

在国内首次研制成功半导体激光器泵浦的主动锁模掺饵光纤激光器，器件利用高速ＬｉＮｂＯ３幅度调制器，重复频率达５ＧＨｚ脉宽２４ｐｓ，峰值功率为２．５毫瓦，波长约为１．５５２μｍ。     

Energy-Transfer Dye Laser in SolGel Silica

Coumarin 460 transfers radiative energy to disodium fluorescein when solgel silica is doped with the dyes, producing disodium fluorescein lasing in superradiant mode at a 3.3% peak efficiency under low-energy transverse pumping by a 1.5-mJ N(2) laser, with disodium fluorescein being present at a concentration below its lasing threshold value.     

脉冲激光模拟器

介绍了一种用于测试激光测距机系统性能的脉冲激光模拟器。该模拟器由１０６４ｎｍ半导体浙江器、准直光学系统、驱动电路、同步及延迟电路、仿真计算软件等组成,可以模拟脉冲激光测距机在各种大气条件下,对不同距离及不同特性的目标测距时的回波信号。     

Compact Dye Laser with High Peak Power

A low energy, unconfined spark provides an inexpensive and reliable source of pump radiation for a small dye laser. Kilowatt peak laser output is obtained, using sub-joule spark input energy. Pulse durations of order 10 ^-7 sec and repetition rates up to at least several hundred pulses per second are typical. Maintenance-free operation exceeds 10⁶ pulses, and a modular design facilitates replacement of expendable components when required.     

Energy Transfer in Dye Mixtures Studied by Laser Fluorimetry

Radiationless energy transfer in the laser dye mixture consisting of rhodamine 6G (donor) and rhodamine B (acceptor) has been studied using fluorescence lifetime measurements. The main aim was to observe directly the effect of energy transfer on the excited-state lifetime of the donor. Estimates of the energy transfer parameters are in agreement with predictions of the Forster theory for resonance transfer based on long-range dipole-dipole interactions.     

用于激光加工工艺的脉冲抽样器的设计

在激光加工技术中，就激光打孔而言，制造出规则的序列脉冲是进行高精度打孔的关键。文章介绍了用于对驻波腔腔长进行扫描的脉冲抽样器的设计及制作，利用我们制作的脉冲抽样器对压电陶瓷堆进行高频调制，从而达到扫描激光器谐振腔腔长的目的。此脉冲抽样器在脉冲激光加工工艺，特别是激光打孔技术中有非常实用的价值。此项工作为激光打标工艺作了相应的探索和准备。     

Pulse Propagation in a Gaseous Laser Amplifier

Abstract

It is shown that some transversal profile modifications, such as ‘overshoot’ at the edges of laser pulses propagating through gaseous laser amplifiers, can be qualitatively explained when diffusion of the active centres of the amplifier is taken into account. The necessary conditions for this situation to occur are also discussed and numerical results are presented which are in good agreement with previously obtained experimental results.     

Achromatic Pumping Condition for a Distributed-feedback Dye Laser

A condition is deduced for angular magnification in a distributed-feedback dye laser (DFDL), in which an optical grating is used for pump beam splitting. When this condition is satisfied, the DFDL wavelength is independent of the pumping wavelength. A new design concept is proposed for the tunable DFDL arrangement.     

基于注入锁模光纤激光器的OTDM时钟提取技术实验研究

提出了一个新的全光时钟提取方案 :用非均匀复用后的OTDM信号去驱动主动锁模光纤环行激光器中的调制器件 ,得到复用前的单路时钟光脉冲 ,并且成功地从 2×10Gb/sOTDM信号中提取出 10GHz的单路时钟光脉冲     

复合固态染料激光增益介质及其器件的研究进展

复合固态染料激光增益介质与器件在军事、信息、科研、医学等领域存在巨大应用前景,是信息材料及其相关器件研究的前沿。本文着重评述了复合固态染料激光增益介质和平面波导型薄膜激光增益介质与器件的研究现状、发展趋势和实用化所需解决的关键问题。     

Thin-Wire Bolometer for Measuring the Pulse Energy of Laser Radiation

A method of measuring the pulse energy and coefficient of nonuniformity of the distribution of strong and wide-aperture laser radiation by means of a thin-wire grating bolometer through simultaneous detection of the maximal value and pulse area of its output signal is evaluated.     

激光水下PPM通信中的脉宽稳定技术研究

云层使PPM光脉冲产生时间扩展。全信号检测带来困难。给出平均多路经时间扩展的计算式。并提出了克服困难的一种方法：将电脉冲非线性展宽，以减小云层厚度对脉宽度的影响。模拟实验表明，当输入脉冲宽度变化范围20ns-5μs时，输出脉冲宽度变化为1-5μs。     

Temperature Dependence of the Delay in Pulse Radiation of an Injection Laser

A theoretical analysis of the temperature dependence of the delay in stimulated radiation of an injection laser is made with allowance for the temperature dependence of the lifetime of the current carriers and the threshold current at different excitation levels. In admissible regimes of excitation the dependence of the delay on the temperature is investigated experimentally. The experimental results agree satisfactorily with those predicted. A method of stabilization of radiation delay in an injection laser based on priority discrimination of pulse signals is described, and its efficiency is investigated experimentally.     

平顶激光脉冲在非均匀介质中的传输分析

以新型方波YAG激光器稳定性、可靠性及非线性应用项目的试验为基础，分析了用慢调Q腔倒空技术产生的平顶激光脉冲在非均匀介质中传输过程的能量与模式特性、非线性频率变换等方面的关系。     

脉冲激光远程投送的分布式光纤拉曼温度传感系统

传感光纤分成了前后两段,脉冲激光通过光分路器分成大小不同的两路分别注入前后段传感光纤,后段传感光纤的脉冲激光并不是通过前段传感光纤注入,而是通过一条专用的传输光纤远程投送一段距离后通过波分复用器再注入,该方法能有效提高后段传感光纤的拉曼散射信号强度,从而避免了温度解调精度随传感距离的增大而不断劣化的问题。系统实现了22.7 km的传感距离,前后段传感光纤测温精度±0.5℃。