超短腔微微秒脉冲可调谐染料激光器

本报告是根据激光振荡的瞬态性质,利用极短的腔长,极短的光子寿命,来获得可调谐微微秒脉冲,使器件体积大大减小,只有普通标准具那么大,重量不过一、两公斤,同时,它本身就是一台法布里-珀罗标准具,用He-Ne激光器极易调整和监视。 激光器的两块腔板间隔可以调节,从十几个微米一直到几百个微米。染料溶液可以流进流出,改变染料种类或浓度时,不必拆卸激光器。 实验结果表明,该激光器的脉冲序列重现性较好,底片多次曝光波形重迭,用光克尔效应,由激励脉冲和探测脉冲相对延迟的强度关系,测得脉宽为～40微微秒。     

同步泵浦染料激光器产生高功率可调谐微微秒激光脉冲

本文介绍一种用Nd:YAG双锁模的倍频脉冲序列,同步泵浦以曲率半径R=2m的凹面光栅所组成的染料激光器,实现了高功率可调谐的微微秒染料激光输出。用条纹照相机对同步泵浦锁模激光系统中各部分的输出特性进行了实验研究和测试。     

半导体激光超短脉冲宽度的非共线二次谐波自相关测量

设计了用于高重复率超短脉冲半导体激光脉宽测量的非共线二次谐波自相关测量装置。给出了实际测量结果。从理论上分析了该装置的时间分辨率。     

大功率可调谐微微秒脉冲放大系统

实验中采用的放大系统如图1所示。氩离子激光器型号为SP-171型,使用514.5nm单谱线,利用声光器件以80MHz左右的频率进行主动锁模。当放电电流为45A时,平均输出功率300mW。此时的氩离子激光器的脉冲波形必须随时监测。用高速光电二极管SP403B(上升时间50ps)和取样示波器(上升时间30ps)观测到的典型脉冲波形如图2所示。图中在最大尖峰后面的几个小峰是由测量系统的冲击激励造成的。把测量系统的时间分辨率考虑进去的激光脉宽约为160ps。另外,开机2小时后激光输出能够稳定下来,但是外围设备的振动将引起输出下降,因此要注意防震。     

超短腔单模可调谐微微秒染料激光器

本文报道单模可调谐微微秒染料激光器,其腔长在0～300微米范围内可连续变化,波长在若丹明6G染料的增益带宽之内连续可调。     

调谐与可重复的锁模微微秒脉冲

国际商业机器公司的研究人员为光谱学应用发展了一种产生可调谐、高重复率的微微秒脉冲的技术。据说,用单个短至10毫微秒的半功率、全宽度的泵浦脉冲对任何物质进行锁模,还是第一次。     

高效率可调谐紫外微微秒脉冲列的产生

最近，以产生稳定可调谐超短光脉冲列为目的，正在活跃地开展锁模连续波染料激光器的研究工作。但是，其波长范围只限于可见光区，在考虑超短光脉冲列的应用时，把波长范围扩展到波长更短的紫外区这一问题,可以说是重要的研究课题之一。     

一个简单实用的微微秒脉冲宽度测量装置

被动锁模Nd玻璃激光器输出以非共线倍频的方式在LiIO_3内产生二次谐波,用一维二极管列阵将谐波强度的空间分布显示于通用的示波器,根据脉宽与谐波光强分布的宽度之间关系,可得出脉冲串的平均脉冲宽度。     

一种准分子激光泵浦的微微秒染料激光脉冲放大器

本文叙述一种在一个泵浦周期内讯号脉冲三次通过染料池的微微秒激光脉冲放大器,它有效地利用泵浦能量,可以得到4×10~4的高增益,低的放大自发荧光以及没有脉冲变宽,并且结构简单,工作稳定。用四能级分子模型,以及作速率方程的数值解,对放大器的特性做了计算机模拟。计算与实验结果相符。     

用工业电视测量微微秒激光脉冲横模分布

实验装置如图1所示.第一步先用一台单模He-Ne激光器件作为YAP器件模式测试实验的模拟器件.开启工业电视后,一边观察监示器上He—Ne模式图象,一边调整加有6328(?)滤色镜摄象机的焦距,光圈靶压,把通过转光棱镜的He—Ne模式图象成象在监示器的中心部位(摄象机和监示器中心部位几何失真为最小),使之成象为最清楚和亮度为临界饱合状态.然后切换控制器的开关(此控制器是专为从视频信号中任意取场、行和场行复合扫描信     

Amplification of tunable, picosecond pulses from a single-mode, short cavity dye laser

The design and performance of an Nd⁺³:YAG pumped, short cavity dye laser-dye amplifier system is reported. This system produces narrow bandwidth, broadly tunable picosecond pulses with energies in the millijoule range.     

Tunable near-infrared picosecond pulses from a short-cavity dye laser

We report on the generation of tunable infrared picosecond pulses by a short-cavity dye laser system consisting of a short cavity, a three-stage amplifier, and a wavelength control unit. The laser emission is temporally, spectrally, and spatially resolved. The conditions for optimum performance are ascertained, and the output characteristics important to experimental applications are determined.     

High-repetition tunable picosecond dye laser pumped by a copperbromide laser

It is reported that by mixing the saturable absorber DODCI with the gain medium Rh6G, 30-ps pulses can be generated from a short-cavity dye laser pumped by a copper bromide laser with a 25-ns pulsewidth and a 10-kHz repetition rate. A theoretical analysis of pulse shortening by this method is shown to agree with experimental results. A dispersion-amplifier system was employed for synchronous amplification and frequency tuning of the dye laser. The single-pulse energy was up to 0.15 μJ with a linewidth-of 1.0 cm^-1 in a one-stage amplifier, and the amplified spontaneous emission (ASE) background noise was reduced to below 10%. By simply rotating the grating and occasionally adjusting the thickness of the dye cavity slightly, the laser can be tuned continuously from 570 to 590 nm with a nearly Fourier-transform-limited linewidth. The repetition rate can be varied from 10 to 20 kHz     

波长可调的ps超短腔染料激光器的研究

本文报道了用锁模磷酸盐玻璃激光的倍频光泵浦若丹明B超短腔染料激光器的实验装置和实验结果,用TPF和OSA的组合装置研究了磷酸盐玻璃激光器的最佳运转条件,得到了脉宽～5ps的锁模脉冲系列,以此ps光源泵浦的染料激光器获得了波长为620.1～641.6nm,脉冲宽度小于4ps的单模可调谐激光输出。     

Simultaneous determination of the spectral and temporal properties of tunable, single, picosecond pulses from a short cavity dye laser

We report simultaneous quantitative spectral and temporal measurements of the output pulses from a single-axial mode rhodamine 6G short cavity (1-8 mum) dye laser. The dye laser was pumped at 10 Hz with single second harmonic (532 nm) pulses from a mode-locked Nd⁺³:YAG laser. Spectral measurements made with a high resolution spectrograph and temporal measurements made with an ultrafast streak camera indicate the production of Fourier transform limited pulses for near threshold operation. Output pulses of 7-14 ps (FWHM) are observed from the short cavity dye laser when pumped with 15-30 ps duration 532 nm pulses. The output pulse delay and jitter are also investigated. A theoretical model for the temporal evolution of the pulses is presented and compared with the experimental results.     

Narrow-band infrared picosecond pulses tunable between 1.2 and 1.4 µm generated by a traveling-wave dye laser

A novel type of picosecond light source is the traveling-wave dye laser. It consists of a generator and an amplifier cell, both pumped by single pulses. Using the fast switching dye No. 5 with a fluorescence quantum efficiency of5 times 10^{-4}, one obtains an energy conversion of the pump to the IR pulse of up to 10 percent. The spectral width of the IR pulses is 15 cm^-1over the tunability range of1.18-1.4 mum. At 1.33 μm we observe Gaussian shaped pulses of 4.4 ps duration for pump pulses of 4.5 ps generated by a mode-locked Nd:glass laser. The output pulses show a high stability with a jitter of less than 0.2 ps.     

Degenerate four-wave mixing of picosecond pulses in the saturable amplification of a dye laser

We demonstrate intracavity degenerate four-wave mixing in the saturable gain medium of a dye laser. The dye laser is a synchronously pumped bidirectional ring laser that produces pulses of 4 ps duration. The dynamics of the interaction provides information on the phase coherence of the pulses. A simple theory of transient degenerate four-wave mixing is presented that accurately describes the measurements.     

Subnanosecond laser pulses from a grazing incidence dye laser

Dye laser pulses with a duration of 160-350 ps and a spectral width of 0.06 nm were obtained by pumping a grazing incidence dye laser with aQ-switched Nd : YAG laser. The pulse shortening was due to a cavity transient effect which has also been observed in N2laser-pumped dye lasers.