高效率激光二极管泵浦100 Hz 3.5 J Nd：YAG MOPA激光器

研制了结构简单、高效率激光二极管泵浦Nd:YAG MOPA激光器.振荡级输出单脉冲能量1.13J,重复频率为100 HZ.MOPA系统输出最大单脉冲能量2.35 J,光-光转换效率为39％.实验结果和理论计算符合较好.     

千瓦级半导体抽运的固体热容板条激光器

报道了千瓦级激光二极管面阵抽运固体热容激光器的理论与实验研究,分别采用Nd∶YAG单板条和双板条串接的热容激光器,利用热容激光器的理论计算模型计算了在一定的工作时间内激光输出特性,并进行了实验验证。实验中采用的晶体尺寸均为59mm×40mm×4.5mm,对单板条进行抽运时平均功率大约为5.6kW,双板条串接时为11.2kW,重复频率为1kHz,占空比为20%。实验中观察了1s的工作时间内脉冲能量输出的波动情况,单板条时单脉冲能量输出最大为1.3J,在1 s后单脉冲能量输出下降到开始的70%左右,而双板条串接时单脉冲能量输出最大为2.06J,在1s后单脉冲能量输出下降到开始的50%左右,对单块晶体采用通水冷却的准热容热管理模式能有效地降低其热效应。     

大功率Nd∶YAG固体激光器

介绍了一台单级输出灯泵浦大功率脉冲Nd∶YAG激光器。该激光器脉宽0.1-10ms可调,频率1-1000hz可调,总注入电功率12kw。试验得到激光器参数脉冲宽度和频率协调改变,可使激光器在整个脉宽范围内都能稳定500w输出;最大单脉冲能量56J;总体电光效率4.2%;光束质量为25mm.mrad;功率稳定性±2%。     

基于激光火工系统的烟火泵浦激光技术

为研究烟火泵浦激光输出性能,对烟火泵浦激光器中泵浦源与激光晶体棒进行匹配实验研究和烟火泵浦激光器出光实验研究,以及烟火泵浦激光器光纤耦合输出实验研究。实验结果表明:烟火泵浦激光器选用锆氧闪光灯作为泵浦源,与工作物质为Nd∶YAG激光工作物质是相匹配的,烟火泵浦激光器输出能量4.82 J,满足烟火泵浦激光火工系统的能量输出需要;烟火泵浦激光器光纤耦合输出能量2.87 J,光纤耦合装置耦合效率达到50%以上,为烟火泵浦激光器用于战斗机舱盖抛放、飞行员座椅弹射逃生等火工系统研究提供了重要的技术支持。     

闪光灯抽运的Nd∶KGW和Nd∶YAG激光器的性能比较

用重复频率 1Hz、脉冲宽度 12 0 μs的闪光灯侧面抽运 ,在相同的实验条件下 ,对比了Nd∶KGW晶体与Nd∶YAG晶体的激光性能。在自由运转时 ,分别获得 1 0 %和 0 44 %的斜率效率和 0 5 4J、0 .76J的外推阈值能量 ,获得的最大输出能量为 384mJ和 16 5mJ。调Q运转时 ,Nd∶KGW激光器与Nd∶YAG激光器的斜率效率分别是0 16 %和 0 0 7% ,阈值能量为 5 9J和 12 5J。     

LD泵浦Nd∶LuVO4/Cr4+∶YAG被动调Q激光器

采用大功率半导体激光器端面泵浦Nd∶LuVO4晶体，利用Cr4+∶YAG晶体作为可饱和吸收元件，实现了1.06 μm激光的被动调Q运转.在泵浦功率为19.1 W时，获得最高平均输出功率为4.58 W，脉冲宽度为84 ns，单脉冲能量为36.6 μJ以及峰值功率为436.2 W的激光脉冲.     

LD泵浦Nd∶LuVO_4/Cr~(4 )∶YAG被动调Q激光器

采用大功率半导体激光器端面泵浦Nd∶LuVO4晶体,利用Cr4 ∶YAG晶体作为可饱和吸收元件,实现了1.06μm激光的被动调Q运转.在泵浦功率为19.1W时,获得最高平均输出功率为4.58W,脉冲宽度为84ns,单脉冲能量为36.6μJ以及峰值功率为436.2W的激光脉冲.     

带相位共轭镜的Nd∶YAG激光系统

研究了相位共轭镜用于改善MOPA激光系统光束质量的特性研究.利用单纵模环形激光器作为振荡级,对加装有相位共轭镜的MOPA系统的相位共轭反射率、阈值进行了测试,并获得了重复频率10 Hz、单脉冲能量大于200 mJ、近衍射极限的高光束质量激光输出.     

LD抽运Cr4+∶YAG高重复率被动调Q Nd∶YVO4激光器

采用Cr4+∶YAG晶体作为可饱和吸收体，实现连续激光二极管（LD）端面抽运的Nd∶YVO4激光器的高重复率被动调Q.在注入抽运功率为8.8 W时，得到重复频率23.8 kHz、平均功率1.21 W的调Q脉冲序列；每个脉冲能量为51 μJ、脉宽为25 ns、峰值功率达到2.03 kW.实验上研究了脉冲重复频率、平均输出功率、脉冲宽度、单脉冲能量与抽运功率、输出镜透过率的关系.实验结果表明，当抽运功率较大时，脉冲重复频率和输出平均功率随着抽运功率的增加而减小，对此进行了合理的理论解释.     

医用高功率CTH∶YAG脉冲激光器

为了提高Cr,Tm,Ho∶YAG激光器的输出功率对CTH∶YAG准三能级能量转移特性进行了分析,优化了谐振腔的腔长及腔镜的曲率半径,采用了高漫反射陶瓷聚光腔.结果表明,有效抽运光谱带的反射率高达95%,在冷却水温为19 ℃,抽运能量为159 J时,获得最大单脉冲输出能量5.11 J,斜率效率5.6%.     

Diode-pumped 250-W zigzag slab Nd:YAG oscillator amplifier system

A laser-diode-pumped zigzag slab Nd:YAG master oscillator power amplifier (MOPA) system featuring high pulse energy and high average power was developed for pumping of an ultrashort-pulse laser system. The MOPA system consists of an oscillator, a preamplifier, two postamplifiers, and image-relay telescopes. The postamplifiers have an angle-multiplexed ring-type double-pass configuration. A pulse energy of 1.26 J and an average power of 251 W were obtained at a repetition rate of 200 Hz. The frequency-doubled power when a LiB(3)O(5) crystal was used was 105 W at a repetition rate of 170 Hz. The intensity profiles of the fundamental and the second harmonic are nearly top-hat shaped and are suitable for pumping.     

Single mode MOPA structured all-fiber Yb pulse fiber amplifier at low repetition

We describe a mopa structured all-fiber 15 μm fiber amplifier cascade. A single-mode diode laser generating 1064 nm wavelength, several nanosecond pulses at 100 Hz repetition was adopted to seed a corepumping amplifier featuring a 6 μm core Yb-doped fiber. Multi-stage pulse-pumping technology was applied to eliminate ASE as much as possible and ease the heat load of the system that leads to the freedom of temperature control of the laser diode. The master oscillator-power amplifier (MOPA) generated 1064 nm, 18 ns pulse-width, 100 Hz repetition of 220 μJ single pulse energy, peak power >12 kW with single transverse output. The pulse energy of 220 μJ is the largest to date in the all-fiber MOPA amplifier with core diameter around 15 μm to our knowledge.     

一种基于增益调制技术的全光纤化脉冲Yb光纤激光器

以波长为975 nm的半导体激光器作为泵浦源,周期性地脉冲泵浦一个包含Yb掺杂光纤和光纤光栅对的Yb光纤激光器,实现了基于增益调制技术的全光纤化高功率Yb光纤激光器的稳定脉冲输出.在50 kHz重频下,采用20 W的泵浦功率和2.4 μs的泵浦脉冲宽度,获得了1 060 nm波长脉冲宽度仅100 ns的稳定脉冲激光输出,单脉冲激光能量约为20 μJ.以此作为脉冲激光种子进行功率放大,获得了性能稳定的全光纤结构高功率脉冲激光输出,放大后单脉冲能量超过200 μJ,激光放大器斜率效率达到60%.     

400 Hz高光束质量高功率短脉冲激光器

研制了大能量高光束质量短脉冲激光器,系统采用主振荡+预放大器+主放大器2级主振荡功率放大器(MOPA)结构。采用双棒热效应补偿改善光束质量的措施,在重复频率400 Hz时实现单脉冲能量40 mJ、光束质量因子约为1.2的激光输出。激光器放大后实现单路脉冲能量712.5 mJ、脉宽12.4 ns的激光输出,采用球差补偿的方法提高了激光器的光束质量,在最大输出功率下实现了光束质量因子小于2.3,光光效率27.7%。偏振合束后,激光器输出能量大于1.4 J。     

High-beam-quality, 5.1 J, 108 Hz diode-pumped Nd:YAG rod oscillator-amplifier laser system

A high efficiency, high beam quality diode-pumped Nd:YAG master oscillator power-amplifier (MOPA) laser with six amplifier stages is demonstrated. The oscillator with two-rod birefringence compensation was designed as a thermally determined near hemispherical resonator, which presents a pulse energy of 223 mJ with a beam quality value of M² = 1.29 at a repetition rate of 108 Hz. The MOPA system delivers a pulse energy of 5.1 J with a pulse width of 230 μs, a M² factor of 3.6 and an optical-to-optical efficiency of 38.5%. To the best of our knowledge, this is the highest pulse energy for a diode-pumped Nd:YAG rod laser operation with a high beam quality and a pulse width of hundreds of microseconds at a repetition rate of over 100 Hz.     

高峰值功率大能量Nd∶Ce∶YAG激光器的研究

将氙灯抽运Nd:Ce:YAG激光器作为主振荡器,一级抽运Nd∶YAG放大,实现了能量为1.8J,脉宽为8ns,束散角为2.3mrad,重复频率为20Hz的激光输出,峰值功率达0.22GW。该激光器体积更小,效率更高,可靠性更强。     

Study of gain dynamics and temporal jitter effects in copper vapor laser oscillator-amplifier chain

Effect of temporal jitter on the performance of copper vapor laser (CVL) master oscillator power amplifier (MOPA) chain using Monte-Carlo techniques was studied. The MOPA chain comprised an oscillator and five amplification stages. Amplification of CVL signal in each amplifier stage was modeled using rate equation based optical model. The effect of temporal jitter on the pulse energy stability in CVL MOPA chain was estimated for various jitter values. Our studies show that the pulse energy spread and the pulse energy instability increases with increase in jitter which in turn depends on the gain pulse width and the jitter considered. Pulse to pulse gain variation in CVL MOPA chain was studied along with temporal jitter. The acceptable tolerance limit on temporal jitter is ±4 ns for a pulse energy stability of 5% of CVL MOPA chain.     

100 W全光纤声光调Q光纤激光器实验研究

 报道了一台全光纤结构主振荡功率放大(MOPA)型掺镱脉冲光纤激光器,以光纤光栅为腔镜,光纤型声光调Q的光纤激光器为种子源,通过两级掺镱双包层光纤放大器实现功率放大。对声光调Q的光纤激光器输出特性进行了研究,比较了不同泵浦波长、不同重复频率对激光输出功率和脉冲宽度的影响,并实现了最短脉冲宽度25 ns、单脉冲能量45 μJ的脉冲激光输出。在重复频率50 kHz时,对脉冲宽度130 ns、平均功率0.6 W的种子光进行放大,得到了平均功率102.5 W、脉冲宽度约240 ns的激光输出。     

Eye-safe, high-energy, single-mode all-fiber laser with widely tunable repetition rate

We present a novel high-energy, single-mode, all-fiber-based master-oscillator-power-amplifier （MOPA） laser system operating in the C-band with 3.3-ns pulses and a very widely tunable repetition rate, ranging from 30 kHz to 50 MHz. The laser with a maximum pulse energy of 25 μJ and a repetition rate of 30 kHz is obtained at a wavelength of 1548 nm by using a double-clad, single-mode, Er：Yb co-doped fiber power amolifier.