准分子激光泵浦猝灭式染料激光器

描述了利用准分子激光泵浦猝灭式染料激光器获得激光超短脉冲的方法；理论上计算了猝灭式染料激光器产生短脉冲激光的机理；实验上获得了短至３０ｐｓ的染料激光超短脉冲。     

染料调Q的Nd3+∶YAG激光器偏振性测试

为了确定染料调Q的Nd3+:YAG激光器发射的单次激光脉冲的偏振性,利用偏振分束立方体和双通道激光能量计,实验测量了激光脉冲经偏振分束后P偏振光和S偏振光的能量比,分析总结了激光器的偏振性.结果表明:激光器偏振性个体差异很大,不存在统一性;每一台激光器都有各自的偏振性,同一台激光器前后发射的激光脉冲的偏振性可能一致,也...     

上仪公司代理的厂家及产品概要

LambdaPh’Sm公司一造分子激格器准分予激光器，Nd：YAGI光器，可调指监光器，现光染料ode。tel公司一YAC励老器调Q＃冲YAG激光器，镇杨YAG激光器，调Q脉冲YAG剃光田，双（多）脉冲，瞩Q脉冲YAGt光器．可谓谐染料激光田，大功率工业YAG油光器SDL公司一中、大功率缴大H粉等大功率激光二担管，善于现光二极管的激光系统，可调谐现光系统，波长稳定论光，电额及热流，连好输出功率从15mw～240mw，波长从630urn～1550urn，准速组输出＊位功率达1600wExTeCb公司一发分子激张把工系资准分予油光橄加工系统，用于印刷电路板工业的多…     

染料调Q的Nd3+∶YAG激光器偏振性测试

为了确定染料调Q的Nd3+∶YAG激光器发射的单次激光脉冲的偏振性,利用偏振分束立方体和双通道激光能量计,实验测量了激光脉冲经偏振分束后P偏振光和S偏振光的能量比,分析总结了激光器的偏振性。结果表明:激光器偏振性个体差异很大,不存在统一性;每一台激光器都有各自的偏振性,同一台激光器前后发射的激光脉冲的偏振性可能一致,也可能变化较小,也可能完全随机。产生偏振性的具体原因有待进一步研究。     

染料调Q的Nd3+:YAG激光器偏振性测试

为了确定染料调Q的Nd3+:YAG激光器发射的单次激光脉冲的偏振性,利用偏振分束立方体和双通道激光能量计,实验测量了激光脉冲经偏振分束后P偏振光和S偏振光的能量比,分析总结了激光器的偏振性.结果表明:激光器偏振性个体差异很大,不存在统一性;每一台激光器都有各自的偏振性,同一台激光器前后发射的激光脉冲的偏振性可能一致,也可能变化较小,也可能完全随机.产生偏振性的具体原因有待进一步研究.     

高功率脉冲YAG泵浦染料激光器的维修分析

本文介绍高功率脉冲YAG泵浦染料激光器的构成及相关参数 ,分析进口激光器长期使用后造成输出能量下降的原因 ,介绍在实验室条件下用氦 -氖激光定位的维修与调整。     

实用化CuBr激光泵浦混合染料激光器

介绍了一种ＣｕＢｒ激光纵向泵浦的混合染料激光器。针对ＣｕＢｒ激光的双谱线和时域特性,配制了一种二元混合激光染料,设计了一种象散补偿的三镜折叠腔,染料溶液采用高速喷流循环方式,在平均功率为８．０Ｗ的ＣｕＢｒ激光泵浦下,获得平均功率为２．７Ｗ的宽带染料激光输出,转换效率高达３３．６％,能持续长期稳定运行。     

实用化CuBr激光泵浦混合染料激光器

本文介绍了一种ＣｕＢｒ激光纵向泵浦的混合染料激光器。针对ＣｕＢｒ激光的双谱线和时域特性,配制了一种二元混合激光染料,设计了一种像散补偿三镜折叠腔,染料溶液采用高速流循环方式,在平均功率为８．０Ｗ的ＣｕＢｒ激光泵浦下,获得平均功率为２．７Ｗ的宽带染料激光输出,转换效率这３３．６％,能持续长期稳定运行。     

脉冲染料激光腔与输出能量、谱线宽度的关系

依照调谐元件和腔结构参数来计算激光输出线宽、单脉冲输出能量,并由此来选择激光器的结构设计。文内叙述的理论与实验一致,并给出了MTGM腔与MGM腔实验数据的对比,本文对脉冲染料激光器的设计有指导意义。     

JQH型和JQN型通用式脉冲激光器系列

为满足国内科研和生产单位开展激光技术应用和研究工作的需要,我厂于一九七七年试制成功JQH型红宝石通用式脉冲激光器系列和JQN型钕玻璃通用式脉冲激光器系列。JQH型和JQN型通用式脉冲激光器是以红宝石和钕玻璃为工作物质的固体激光器件。是开展激光技术工作的基础器件之一。固定激光器件具有大功率、高能量密度的激光输     

A dye laser with small beam divergence and a stable emission spectrum

The design of a dye-laser head with a hollow cylindrical cell is described. The cell is excited from the inside by a coaxial lamp. The design of the laser head provides the possibility of transverse circulation of the dye solution, which allows generation of sharply directed radiation with a spectrum and a directional pattern that remain constant during the laser pulse. A lasing energy of 290 mJ was obtained in the laser with an ethanol solution of Rhodamin 6G in a 150-mm-long cell with inner and outer diameters of 30 and 35 mm, respectively. The use of a resonator with an interference-polarization filter resulted in the spectrum narrowing to ～0.7 nm and allowed the radiation wavelength to be tuned in a band of ～31.5 nm. The beam divergence was within 5 mrad in all cases.     

Treatment of port-wine stains at 577 nm: clinical results

A pulsed, dye laser at 577 nm was used to treat 65 patients with port-wine stains. Results clearly indicate that the laser parameters of dose, wavelength, and pulse duration contribute to the outcome of laser treatment of port-wine stains.     

A narrow-band source of ultraviolet radiation for laser isotope separation

A pulsed tunable laser source of ultraviolet radiation with a linewidth of <400 MHz, a pulse duration of 9 ns, and a pulse repetition rate of 11 kHz pumped by a copper-vapor laser has been developed. Its average output power at a wavelength of 276 nm is 1.5 W. A system intended for laser isotope separation contains a master oscillator based on a dye laser, two amplifying stages with an average output radiation power of 4.5 W at a wavelength of 553 nm, and a radiation-frequency doubler on a BBO crystal. The master-oscillator laser is built according to a scheme with a diffraction grating positioned at an angle close to the glancing angle, a prism beam expander, and an air-filled hermetically sealed Fabry-Perot etalon. The long-term frequency stability of the output radiation is 10 MHz/h.     

飞秒脉冲激光沉积类金刚石膜实验研究

期望用类金刚石膜作为硅的红外保护/增透膜,采用波长为800nm,脉宽50fs,重复频率1KH z的T i:Sapph ire飞秒激光器及石墨靶材在单晶S i片上沉积了约0.7μm~1μm厚的类金刚石膜(d iam ond-like carbon film s,DLC),获得了光滑致密,硬度显著提高,红外透过率有一定增加的样品。通过对薄膜拉曼光谱和X射线光电子能谱等的测试,发现单脉冲能量在0.4m J~1.6m J范围内变动时,单脉冲能量0.8m J获得的类金刚石膜综合性能最佳,其对应的焦斑功率密度计算值为1.4×1014W/cm2。     

AlGaAs DH pump laser for photoluminescence lifetime measurements

The use of GaAlAs double heterostructure lasers as a pulsed excitation source for photoluminescence time-decay measurements is described. Subnanosecond laser pulses easily allow the determination of luminescence decay times >/=500 ps using a single photon counting system. In contrast to mode-locked gas or dye lasers, this new technique utilizes simple equipment (diode laser and pulse generator) and requires no special alignment or tuning procedures.     

超短脉冲染料激光倍频的实验研究

本文阐述了激光倍频的几个问题,实验中利用一块5.5×6×7mm³的BBO晶体对超短脉冲染料激光进行了腔外倍频实验。为了提高倍频转换效率,实验中利用了柱面镜及不同焦长的球面镜进行聚焦。最后,在基波平均功率120mV的情况下,得到了平均功率为0.54mV的紫外谐波辐射。考虑到基波及谐波的各种损失后,最大倍频转换效率η0.5%。     

Controlled Synthesis and Optical Properties of Pure Gold Nanoparticles

Abstract

Gold nanoparticles were synthesized by laser ablation of a gold metallic disc at wavelengths of 532 nm and 355 nm with 7 ns pulse duration in the pure water. The colloidal gold nanoparticles were characterized by ultraviolet-visible absorption spectroscopy, transmission electron microscopy, and fluorescence spectrometry. The presence of a surface plasmon resonance peak around ～ 524 nm indicates the formation of gold nanoparticles. The formation efficiencies of gold nanoparticles in colloids were found to increase when ablating the gold metallic disc with a laser having a longer wavelength. The size distributions of the gold nanoparticles thus produced were measured by transmission electron microscopy. A reduction in mean diameter of the particles was observed with a decrease in the laser wavelength under the irradiation at a high fluence of 25 mJ/pulse. The fluorescence spectroscopy demonstrated that these gold nanoparticles are fluorescent, showing a strong blue emission intensity at 458 nm.     

A Multifrequency Phase Fluorometer Using the Harmonic Content of a Mode-Locked Laser

ABSTRACT

We describe the construction and operation of a cross-correlation phase and modulation fluorometer which uses the harmonic content of a high repetition rate mode-locked laser as the excitation source.

A mode-locked argon ion laser is used to synchronously pump a dye laser. The pulse train output from the dye laser is amplitude modulated by an acousto-optic modulator and then frequency doubled with an angle tuned frequency doubler. With the particular dye utilized in these studies, the ultraviolet light obtained was continuously tunable over the range 280-310 nm. In the frequency domain the high repetition rate pulsed source gives a large series of equally spaced harmonic frequencies. The frequency spacing of the harmonics is determined by the repetition frequency of the laser. Amplitude modulation of the pulse train permits variation of the frequency quasi-continuously from a few hertz to gigahertz. Use of cross-correlation techniques permits precise isolation of individual frequencies. The cross-correlation frequency required for the analysis of the phase delay and modulation ratio is obtained using coupled frequency synthesizers. In the present instrument three synthesizers are used. One drives the pump mode-locker head, a second drives the acousto-optic modulator and the third is used to modulate the response of the photomultiplier tubes which detect the signal. The accuracy, reproducibility and sensitivity of the instrumentation have been determined. Experimental data are provided to show use of this high frequency cross-correlation phase-modulation fluorometer for the determination of fluorescence lifetimes and rotational motions of tryptophan in solution and in proteins.