微微秒相干反斯托克斯喇曼散射

我们用锁模Nd~(3 )玻璃微微秒脉冲激光序列同步泵浦染料激光器产生的锁模运转染料激光作为ω_2,斯托克斯光束,Nd~(3 )玻璃激光倍频绿光作为固定频率ω_1光束和探测光束,对材料相干激发和探测。实验装置如图1所示。泵浦源采用一级振荡、二级放大主被动锁模钕玻璃激光系统。     

由分布反馈产生超短脉冲的染料激光器

分布反馈染料激光器(简称DFDL)是七十年代发展起来的。Kogelnik及Shank等于1971年第一次将分布反馈体现在染料激光器中。经过多年的努力,特别是最近的研究证明DFDL是超短光脉冲产生的一种新途径。Zs.Bor等人用TEA N_2激光器泵浦DFDL获得了6ps的短脉冲输出,用锁模Nd:YAG激光泵浦DFDL产生了1.6～3.5ps转换极限的单脉冲。DFDL廉价、简便,该技术比锁模技术简单可靠,不需特殊的脉冲选择装置就可获得单脉冲,不用调制器就可直接产生微微秒脉冲,即使有几个脉冲,也可利用各脉冲的方向不同,方便地进行空间选取,     

行波放大自发辐射产生超短光脉冲的研究

我们采用泵浦能量具有梯度分布的横向泵浦方案,以N_2激光(700ps)为泵浦源,获得约50ps的染料光脉冲输出,以锁模Nd:YAG倍频光(46ps)作泵浦源,获得8～15ps光脉冲输出。用条纹照相机和光学多道分析器测量了脉冲波形和光谱。实验研究了激发长度、染料浓度和激发能量等参数对光脉冲宽度的影响,比较了行波ASE和非行波ASE的波形和光谱。     

1975年美国激光工程和应用会议技术报告摘要选辑

1.3 Nd:YAC激光泵浦的一种同步锁模染料激光器的非线性混频,放大和微微秒脉冲的产生利用锁模激光器泵浦的染料激光器,可产生与泵浦脉冲时间同步的极短脉冲。本文介绍利用条纹照相机进行的微微秒脉冲形成的研究。这是一种同步锁模染料激光器,用被动锁模Nd:YAG倍频激光器泵浦。利用光源的同步性质,并通过非线性方法,就可以制成高增益的短脉冲染料放大器,获得可调波长(紫外和红外)的超短(微微秒级)     

超短行波放大自发辐射的研究

用泵浦能量具有梯度分布的横向同步泵浦方案,产生超短行波自发辐射光脉冲。以N_2激光为泵浦源,获得约50ps的染料光脉冲输出,以锁模Nd:YAG倍频光作泵浦源,获得8～15ps光脉冲。用条纹照相机和光学多道分析器测量了脉冲波形和光谱。 计算机模拟了行波放大自发辐射的瞬态行为,计算结果与实验结果相符合。     

激光测试方法与仪器

该ps电脉冲、ps光脉冲相关测量仪用离子辐照损伤SOS片制作的光电导开关作取样门(响应时间∠10ps),用锁模Ar~+激光器同步泵浦染料激光器作激发和取样光源(脉宽∠2ps,     

激光等离子体诊断用微微秒紫外高功率激光脉冲的产生

氙灯泵浦的可调谐染料激光器锁模脉冲用XeCl准分子激光器泵浦的三级染料激光放大器放大后,经倍频再用XeCl准分子激光器放大,在308毫微米处获得了微微秒高功率激光脉冲输出,其峰值功率可达500兆瓦,功率净增益为200。     

550～689nm重复率YAG激光同步泵浦染料激光器

用重复率脉冲锁模YAG激光同步泵浦四种激光染料,获得脉冲重复率20Hz、峰值功率MW级、平均功率mW级、脉宽30ps染料激光。波长复盖范围为550.0～689.0nm,谱线宽度0.05nm。实验比较了L_D=1/2L_PF和L_D=L_P两种匹配腔的输出特性。     

脉冲同步泵浦染料激光器及紫外超短脉冲的研究

以主被动锁模Nd~(8+):YAG激光器的倍频输出纵向同步泵浦若丹明染料激光器,获得波长范围5600～6400连续可调谐超短光脉冲,用光克尔法测得5900处脉冲宽度为11ps,峰值功率超过1MW。以ADP晶体腔外倍频染料激光,获得2890～3150连续可调谐紫外超短光脉冲,最高倍频效率达5％     

在中红外波段通过AgGaS_2降频变換产生可调微微秒脉冲

在差频情况下,一台Nd:YAG锁模激光器和一台行波染料激光器在AgGaS_2晶体里混频,生产微微秒脉冲。染料激光器在1200～1460nm之间是可调的。最后得到的参量脉冲可调波段为3.9～9.14μm。频谱带宽是相当窄的。测量值为△v=6.5cm~(-1),该值在整个测量范围内为一常数。百分之几的Nd:YAG激光光子转换为红外光子。21ps的泵浦脉冲产生8ps参量脉冲。     

主动锁模和调Q Nd:YAG激光倍频同步泵浦染料激光器特性研究

本文介绍一种主动锁模和调Q Nd:YAG激光倍频同步泵浦可调谐染料激光器。由此激光器已获得脉冲宽度为70ps,脉冲能量为0.1μJ,调Q重复率达7kHz,调谐范围为580～610nm的微微秒脉冲,本文还研究了这一激光器的时间和频谱特性,分析了腔长失配对脉宽和中心波长的影响。     

Frequency-stabilized mode-locked solid-state laser system forprecision range-Doppler imaging

We report measurements which show that an actively stabilized cw mode-locked Nd:YLF laser, in combination with a flashlamp-pumped Nd:glass amplifier, can achieve better than 1 cm resolution of distant rotating targets using range-Doppler imaging. To do this, we have produced trains of 50 ps mode-locked pulses with less than 25 kHz peak-to-peak optical frequency broadening and jitter of the laser modes. This frequency stability is achieved by active control of the oscillator cavity length using an external cavity as a reference. Cavity length stabilization can also reduce mode-locked laser timing jitter if the jitter is caused by cavity optical path length changes common to all laser modes. In our laser, however, the active optical-frequency-stabilization did not significantly improve laser pulse timing stability from the approximate 2-ps jitter levels achieved in our passively stabilized cavity. Analysis of the data indicates that a significant fraction of the timing jitter was due to laser cavity path length changes that varied from mode to mode     

A frequency-tunable mode-locked CW Nd:Glass laser

Mode locking and frequency tuning of a CW light-focusing Nd : glass laser called the SELFOC Nd : glass laser were achieved. Using an acoustooptic modulator having a modest degree of modulation (about 3 percent), almost perfectly mode-locked pulses as short as 49 ps were obtained. Pulsewidth was measured with an intensity-correlation method using the second-harmonic generation in KDP. Most of the observed shapes of the intensity-correlation curves were in agreement with theories previously presented by several authors. When the laser was mode locked, the long-term averaged optical spectrum was observed to narrow considerably. Some experimental evidence that the CW SELFOC Nd:glass laser could be considered to have a homogeneously broadened line was also found. Frequency tuning was achieved by using a tilted etalon in a cavity. When a 50-μm-thick etalon was used, the tuning range was more than 40 Å. Pulses obtained from a frequency-tuned mode-locked laser were as short as about 100 ps.     

脉冲主动锁模和主被动锁模激光器

本文报导了脉冲式主动、主被动锁模磷酸盐玻璃振荡器的特性.主动锁模的脉冲宽度为200微微秒左右,输出性能比较稳定.对于输出脉宽为7微微秒左右的主被动锁模,出现卫星脉冲的几率与调制器的调制系数有关.使用不同的腔内标准具能产生30微微秒和70微微秒的脉冲,没有观察到卫星脉冲.主被动锁模的性能比被动锁模有所提高.     

Mode-locked operation of a Nd:YLF laser and amplification in aQ-switched Nd:glass slab laser

A Nd:YLF laser pumped with a CW dye laser and acoustooptically mode locked at 38 MHz has an output power of 130 mW and a pulse length of 60 ps. Insertion of intracavity etalons and misaligning the mode locker allows for stable operation with a continuous range of pulse lengths from 60 ps to 4 ns. The 1.053-μm emission permits amplification of these pulses in a Q-switched Nd:phosphate glass slab laser oscillator up to intensities limited by optical damage     

Temporal compression of mode-locked pulses for laser-fusion diagnostics

Regenerative compression of mode-locked laser pulses has been developed to provide a temporally short probe pulse for diagnosing laser-fusion plasmas. A single mode-locked pulse injected into a regenerative amplifier is compressed by an intracavity saturable dye. Analysis indicates the best operational mode and choice of experimental parameters. Experiments using Nd:YAG and Eastman A9740 dye demonstrate an eightfold compression from 120 to 15 ps with a shot-to-shot stability of ±4 percent. An oscillator/regenerative compressor system demonstrates a 15 ps probe pulse synchronized within ±5 ps to a 1000 ps target-heating pulse.     

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.     

Feedback stabilized actively mode-locked Nd:phosphate glass laser

An electrooptic, actively mode-locked Nd: phosphate glass laser system is described employing a novel single-step feedback system to stabilize the pulse buildup time. Single output pulses of ∼100 ps duration with energies of up to 1 mJ could be reliably generated with a standard deviation in thesim3.2 mus pulse buildup time of ±40 ns allowing synchronization with pulses from laser systems at other wavelengths. Evidence of pulse broading due to self-phase modulation was observed together with wide tunability of the output wavelength from 1.054 to 1.068 μm.     

Ultrafast optical multi/demultiplexer utilising optical kerb effect in polarisation-maintaining single-mode fibres

An ultrafast time-domain optical multi/demultiplexer utilising the optical Kerr effect in two birefringent fibres concatenated with each fast axis crossed is proposed. Stable demultiplexing of an ultrashort 30 ps optical pulse train at 1.97 GHz from a gain-switched DFB LD has been successfully demonstrated using CW mode-locked Nd:YAG laser control pulses.     

铝酸钇被动锁模激光器

报导了Nd:YAP被动锁模激光器,获得了比较稳定的锁模超短脉冲系列,脉宽～10微微秒,双光子荧光对比度～2.8.