亚纳秒脉宽半导体泵浦电光调Q Nd:YVO4激光器

报道了一种利用半导体端面泵浦Nd:YVO4晶体并采用电光调Q的短腔激光器。通过理论分析和实验研究,确定了激光器的结构和参数,并证明使用电光调Q技术可以实现亚纳秒脉宽激光输出。在腔长20mm、重复频率为1～100Hz的范围内,获得脉宽小于600ps、单脉冲能量大于0.42mJ以及光束质量M2为1.9的100Hz激光输出,不稳定度小于±3%。     

稳定输出的兆瓦级氮分子激光器

氮分子激光器是一种简单方便的强紫外辐射源。本文介绍一台稳定、可靠、紧凑的高功率氮分子激光器,该实验器件在1.5Hz 重复率运转时,每个脉冲输出能量6.6—6.8mJ,激光脉宽3.5—4ns,峰值功率1.6—1.9MW,能量输出不稳定度小于±5%。     

基于内循环水冷系统的小型化电光调Q激光器

报道了一种基于内循环水冷系统的10 MW级高峰值功率窄脉宽小型化电光调Q Nd∶YAG 激光器。采用机电一体内循环水冷结构,有效地减小了激光器体积,整机尺寸为320 mm×150 mm×150 mm。当LD泵浦源能量为800 mJ时(注入电流为100 A),获得了137 mJ 的静态激光输出,光-光转换效率为17.1%;电光调Q后在驱动频率为30 Hz的条件下,获得了100 mJ,脉宽9.9 ns的激光输出,光-光转换效率为12.5%,动静比为73%。激光器连续工作1.5 h不稳定度小于3%。     

二极管抽运200Hz TEM00模Q开关Nd:YAG激光器

用三只QCW-600W激光二极管侧面抽运Nd:YAG激光器,在重复频率为200Hz,单脉冲注入能量为270mJ条件下,实现了29.7mJ,TEM00模调Q激光输出,M2=1.12,脉宽6.4ns,光-光转换效率11%,斜效率16.5%,输出能量不稳定度1.14%.通过KTP晶体腔外倍频,获得了单脉冲能量16.8mJ,脉宽5.6ns的绿光输出,倍频效率56.6%.     

定向棱镜改善Cr4+:YAG调Q输出稳定性的研究

为了改善Cr4+:YAG被动调Q激光器的输出稳定性,采用了定向棱镜谐振腔,通过实验得到了以下结果:单脉冲能量稳定度由7.3%提高到2.2%,脉宽稳定度由13.5%提高到6.5%,频率精度由0.01%提高到0.005%,输出脉冲波形稳定光滑。研究表明,采用定向棱镜谐振腔技术的Cr4+:YAG被动调Q激光器的输出稳定性较原平平腔激光器得到了显著改善。另外还报道了定向棱镜谐振腔技术消除Cr4+:YAG被动调Q激光器子脉冲的现象。     

关于电流脉冲CO_2激光器的研究

该激光器的电源兼有高稳定度恒流电源和宽颇带方波脉冲电源两种功能。其频率调节范围为0～3000Hz,脉宽50μs～4ms。使用该电源,一般封离型CO_2激光器在1000Hz以下均可稳定运行,其平均激光功率相当于稳流CO_2激光功率,而脉冲峰值功率则远大于稳流CO_2激光功率。为了保证脉冲激光     

一种新型脉宽编码激光器的理论研究

针对传统的激光脉冲编码激光器通常采用脉冲重复频率编码易受干扰的技术现状,提出了采用脉宽可调激光器进行激光脉冲宽度编码的新构想。并由此进一步提出了一种采用快速电光削波技术的脉宽可调激光器作为脉宽编码激光器的实现方案,这种脉宽编码激光器由种子激光源,电光削波组件及激光放大器组成,用可编程控制器控制延迟电路来改变普克尔盒电极上的电脉冲宽度,最终实现输出激光脉冲的脉宽可调。完成了这种脉宽编码激光器及其实验系统的理论设计。初步的分析结果证实了该方案的可行性。     

主动锁模掺钛蓝宝石激光器

引言1987年开始对掺钛蓝宝石激光主动锁模的研究”－’‘至今并未丧失其迫切性，这是由于该激光器可调谐其辐射波长。曾研究它的脉冲宽度与腔内元件参数及辐射波长的关系＊‘。在没有色散元件的主动锁模激光器中得到的最小脉宽为150fs［‘j。在具有色散调谐元件的激光器中，上述文献中得到的脉宽等于1～8O0PS。同时尚不知道脉冲形状（一般认为是高斯形）、脉冲稳定度和实现范围与激光控制参数的重要实验关系。实验结果与通常采用的Kujzenga－Siegman模型［’］的Lll较仅在文献〔3，sj中列出，表明最短脉宽与上述模型不同，与光谱宽度有关…     

大功率双路声光Q开关驱动源技术研究

对大功率双路声光（A-O）Q开关驱动源的系统组成及工作原理进行了阐述,通过系列试验验证了其高可靠性、高稳定性、低电磁干扰（EMI）等优良性能,并最终通过和激光器联调,获得了大功率、窄脉宽、高稳定度的高品质激光输出。     

脉宽6PS的被动锁模钕玻璃激光器

本文报告脉宽6PS的被动锁模钕玻璃激光器,包括该激光器的性能参数、关键技术及三种脉宽测量方法,并指出这种激光器的某些应用。     

FM mode-locking at 2.85 GHz using a microwave resonant opticalmodulator

A diode-pumped 1053-nm NdYLF laser was harmonically mode locked using a microwave resonant optical modulator (MROM), achieving pulsewidths of 4.5 ps at a repetition rate of 2.85 GHz and 4 ps at 237.5 MHz. The laser produced average output powers greater than 400 mW     

Passively Mode-Locked High-Power (210 mW) Semiconductor Lasers at 1.55-μm Wavelength

We report on the generation of stable passively mode-locked pulses at 1.55-mum wavelength from high-power electrically pumped, large transverse mode semiconductor diode lasers. Optical pulses as short as 5.8 ps were measured directly from the laser. This is the shortest pulsewidth reported (without external compression) from a monolithic mode-locked slab coupled optical waveguide laser. The highest average power measured in mode-locked operation was 212 mW albeit the pulsewidths were larger. It was also found that length of the laser changes the power-current efficiency with the largest recorded efficiency of 165 mW/A.     

Mode locking of a novel split-contact semiconductor Laser-experiment and theory

A novel semiconductor laser, with a curved and tapered active region and a split contact, has been experimentally and theoretically mode-locked for the first time. An innovative yet simple traveling-wave rate-equation model has been developed to incorporate the tapered waveguide structure together with external-cavity grating effects and the reverse biased saturable absorber region. Both the experiment and model have demonstrated pulsewidths of around 5.5 ps at a repetition frequency of 2.5 GHz and a tunable emission wavelength around 1550 nm. The model has been used to demonstrate optimized operation of the device with a predicted reduction in pulsewidths down to 1 ps.     

Kerr lens modelocked solid state laser in the red (639 nm)

The authors report Kerr lens modelocking of the Pr³⁺:YLF laser, operating at 639 nm, initiated through the use of a solid state saturable absorber, generating pulsewidths of 8 ps at repetition rates around 100 MHz     

新型近红外域调Q及锁模用染料

合成了吸收在红外域１２７０ｕｍ的红外调Ｑ、锁模染料，它的四氯乙烯溶液及聚甲基丙烯酸甲酯薄膜能对１０６４ｕｍ和１０７９ｕｍ激光进行满意的调Ｑ，脉宽为４～７ｕｓ。当用其二甲基亚砜溶液对１０７９ｕｍ和１３４０ｕｍ激光进行锁模时，显示出优良性能，锁模脉宽为３０～５０Ｐｓ。     

Active mode-locking of an InGaAsP 1.55 ?m laser in a fibre resonator with an integrated single-mode-fibre output port

We describe the first 1.55 ?m InGaAsP optical-fibre composite-cavity laser with an integrated single-mode-fibre output port. Mode-locked pulsewidths of 4.8 ps at a 2 GHz repetition rate, with peak powers of 56 mW, are demonstrated. These are the shortest reported mode-locked pulses from InGaAsP lasers.     

10-GHz ultralow-noise optical sampling stream from a semiconductordiode ring laser

We report, what is to our knowledge, the lowest-noise pulsetrain produced to date with an actively mode-locked external-cavity semiconductor diode laser. Operating characteristics at 10 GHz include dispersion-compensated pulsewidths as short as 1.2 ps, amplitude noise as low as 0.12% rms, and residual phase noise as low as 43-fs rms. Potential application of such a laser in a next-generation optical analog-to-digital converter would theoretically provide as much as 8.6 bits of resolution, while sampling a 5-GHz waveform at the Nyquist frequency     

A simple first positive system nitrogen laser for use in optical fiber measurements

A near infrared laser operating on several transitions of the first positive system of N2was developed for measurements associated with optical fibers. The laser features a simple, longitudinal, segmented design giving pulsewidths of 60 to 80 ns full width at half maximum (FWHM) and peak powers of over 600 W in the 0.86 to 0.89 μm region in addition to significant output near 1.04 and 1.23 μm. Backscatter-reflection returns from optical fibers have been obtained using the laser.     

Picosecond structure in self-pulsing GaAs injection lasers

Partial mode locking has been observed in self-pulsing GaAs injection lasers using an optical correlation technique. The lasers are operated at room temperature and the self-pulsing occurs near the end of the injection current pulse. The pulsewidths are about 4 ps, which are the shortest observed in an injection laser.     

Vibrating mirror as a repetitiveQswitch

A continuously pumped Nd:YAG laser has been repetitivelyQswitched with a vibrating mirror at repetition rates up to 10 kHz. Peak powers of 70 kW and pulsewidths of 60 ns have been observed. TheQswitch is comprised of a mirror attached to one end of a torsional rod driven at its mechanical resonance frequency.