A diode-pumped linear intracavity frequency doubled Nd:YAG rod laser with 40 ns pulse width and 73 W green output power

We analyzed a linear cavity for intracavity frequency doubling of a diode-pumped acousto-optic Q-switched Nd:YAG rod laser, and showed that a green laser beam with a short pulse width can be generated efficiently. A green laser output power of 73 W corresponding to the 83.9% of maximum IR output power was obtained with a 40 ns pulse width at a 10 kHz repetition rate. A green output power of 40 W with a 35 ns pulse width was measured at a 5 kHz repetition rate. Minimum laser pulse width of approximately 32 ns was obtained around 1 kHz repetition rate for both green and IR laser beams.     

High Power Continuous-Wave and Acousto-Optic Q-Switched Nd：GdVO4 Laser Operated at 912 nm

We present a high power and efficient operation of the ^4F3/2 → ^4I9/2 transition in Nd：GdVO4 at 912nm. In the cw mode, the maximum output power of 8.6 W is achieved when the incident pump power is 40.3 W, leading to a slope efficiency of 33.3% and an optical-optical efficiency of 21.3%. To the best of our knowledge, this is the highest cw laser power at 912nm obtained with the conventional Nd：GdVO4 crystal. Pulsed operation of 912nm laser has also been realized by inserting a small aeousto-optie （A-O） Q-Switch inside the resonator. As a result, the minimal pulse width of 20ns and the average laser power 1.43 W at the repetition rate of lOkHz are obtained, corresponding to 7.1 kW peak power. We believe that this is the highest laser peak power at 912nm. Furthermore, duration of 65ns has also been acquired when the repetition rate is 100 kHz.     

LD泵浦Nd：YAG激光器的连续激光输出和高重复率调Q

用连续输出１Ｗ国产多量子阱激光二极管列阵（ＭＱＷ－ＬＤＡ）泵浦Ｎｄ：ＹＡＧ固体激光器，连续激光输出最大功率为１１２ｍｗ，光－光效率为１０．６％，斜效率为２０％．实现了连续泵浦高重复频率（１ｋＨｚ，４ｋＨｚ，１０ｋＨｚ）调Ｑ输出，最大峰值功率为３５５Ｗ，最大平均功率为４３．７ｍｗ．     

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。     

High-power high-repetition-rate acousto-optically Q-switched 1342 nm laser

A high-power high-repetition-rate acousto-optically Q-switched 1342 nm laser with double Nd:YVO₄ crystals pumped by fiber-coupled laser diodes is presented. The highest output power of 13.7 W was achieved with a total of 42 W pumping power in cw operation, the slope efficiency was measured as 36%, and the optical efficiency was better than 32%. In Q-switchedoperation, the highest pulse repetition rate of 100 kHz was obtained. At 50 kHz repetition rate, the laser exported 11.2 W average output power, with 60 ns average pulse width, ∼5% width stability (RMS) and ∼8% peak-power stability (RMS). At 10 kHz repetition rate, the highest average output power was measured as 6.3 W, single pulse energy was calculated as 0.63 mJ, with pulse width of 19 ns and peak-power higher than 30 kW. Combining the experimental results, we analyze and discuss some problems concerning Nd:YVO₄ crystal working at 1,342 nm wavelength. PACS 42.55.-f; 42.55.Xi; 42.60.Gd     

High repetition rate,high peak power acousto-optical Q-switched 946 nm Nd:YAG laser

A diode-end-pumped high repetition rate, high peak power acousto-optical (AO) Q-switched 946 nm Nd:YAG laser was demonstrated in this paper. In our experiments, a 20 mm miniature acousto-optical Q-switch was employed in a 45 mm linear laser cavity for generating the short laser pulse. At a repetition rate of 10 kHz, a maximum average output power of 2.9 W was achieved with a pulse width of 24.4 ns, giving a peak power of 11.9 kW. To the best of our knowledge, this is the highest peak power 946 nm Nd:YAG laser at high repetition rate operation. Moreover, pulse train with good stability was also obtained at the repetition rate of 50 kHz. At an incident pump power of 22.3 W, up to an average output power of 3.5 W pulsed 946 nm laser was generated at 50 kHz with a pulse width of 69 ns, corresponding to an optical conversion efficiency of 15.7% and an average slope efficiency of 24.1%, respectively.     

Diode end-pumped Q-switched high-power intracavity frequency-doubled Nd:GdVO4/KTP green laser

A diode-laser-array end-pumped acousto-optically Q-switched intracavity frequency-doubled Nd:GdVO₄/KTP green laser, formed with a three-mirror folded resonator, has been demonstrated. With 15 W of pump power incident upon the Nd:GdVO₄ crystal, a maximum average green output power of 3.75 W was obtained at 50 kHz of pulse repetition frequency, giving an optical conversion efficiency of 25%, whereas the effective intracavity frequency-doubling efficiency was determined to be 72%. At the incident pump power of 12.8 W, the shortest laser pulse was achieved at a pulse repetition rate of 10 kHz, the resulting pulse width, single pulse energy, and peak power were measured to be 35 ns, 108 μJ, and 3.1 kW, respectively. Received: 18 May 2000 / Published online: 20 September 2000     

Room-temperature cw and pulsed operation of a diode-end-pumped Tm:YAP laser

We report the continuous-wave and acousto-optical Q-switched operation of a diode-end-pumped Tm:YAP laser. Continuous-wave output power of 3.5 W at 1.99 μm was obtained under the absorbed pump power of 14 W. Under Q-switched laser operation, the average output power increased from 1.57 W to 2.0 W, with an absorbed pump power of 12.6 W, as the repetition rate increased from 1 kHz to 10 kHz. The maximum Q-switched pulse energy was 1.57 mJ with a repetition rate of 1 kHz. The minimum pulse width was measured to be about 80 ns, corresponding to a peak power of 19.6 kW. PACS 42.55.Rz; 42.55.Xi; 42.60.Gd     

Diode-pumped simultaneously Q-switched and mode-locked Nd:GdVO<Subscript>4</Subscript>/LBO red Laser

A diode-end-pumped simultaneously Q-switched and mode-locked intracavity frequency doubled Nd:GdVO₄/LBO red laser with an acousto-optic Q-switch was realized. The maximum red laser output power of 250 mW was obtained at the incident pump power of 8.3 W and the repetition rate of 10 kHz. At 5 kHz, the maximum mode-locking modulation depth of about 80% was achieved with the Q-switched pulse width of 440 ns. The red mode-locked pulse inside the Q-switched pulse had a repetition rate of 115 MHz, its average pulse width was estimated to be about 350 ps.     

LD泵浦的声光调Q高重复率Nd∶GdVO4激光器

报道了利用LD泵浦、1.06 μm声光调Q准连续Nd∶GdVO4激光器的输出特性.当泵浦功率为4.15 W,重复率为40 kHz时,获得的最大平均输出功率为1.46 W,光-光转换效率为35.1%,斜效率为44.2%.在重复率为10 kHz时,获得了最短脉宽24 ns, 最大单脉冲能量为63.2 μJ,相应峰值功率为2.62 kW.     

基于金纳米笼的1106 nm被动调Q Nd:GAGG激光器

成功制备了金纳米笼溶液并将其作为饱和吸收体,实现了中心波长为1106 nm的Nd:GAGG激光器的调Q运转。在输出镜透过率为3%的激光器中,在泵浦功率6.70 W下获得的最大平均输出功率为98 mW,此时对应的脉冲重复率为206 kHz,最短脉冲宽度为436 ns;在输出镜透过率为7%的激光器中,当泵浦功率为7.69 W时,得到的最大平均输出功率为121 mW,最短脉冲宽度为370 ns,对应的脉冲重复率为170 kHz。实验结果证明了金纳米笼在近红外波段激光器中用作饱和吸收体的巨大潜力。     

激光二极管端面泵浦的调Q内腔倍频Nd：YAG激光器

报道了用两个１．５Ｗ激光二极管偏振耦合端面泵浦的声光调Ｑ内腔倍频Ｎｄ：ＹＡＧ激光器。输出５３２ｎｍ绿光重复频率１ＫＨｚ时，最大峰值功率为２．２３ＫＷ，最窄脉宽为１８ｎｓ，平均功率４０ｍＷ。最高重复频率３０ＫＨｚ。重复频率１５ｋＨＺ时，最高平均率１２８ｍＷ。对声光调Ｑ内倍频Ｎｄ：ＹＡＧ激光器的动态特性进行了理论分析及计算。     

2 μm波段半导体可饱和吸收镜被动调Q光纤激光器

基于半导体可饱和吸收镜和光纤光栅实现了稳定的2 m波段被动调Q光纤脉冲激光器,输出激光的中心波长为1958.2 nm。随着泵浦功率的增加,输出脉冲的重复频率不断增加,而对应脉冲的宽度不断减小。输出脉冲重复频率的变化范围为20～80 kHz,脉冲宽度的变化范围为490 ns～1 s。当泵浦功率为1.3 W时,调Q光纤激光器的最大平均输出功率为91 mW,脉冲重复频率为80 kHz,脉冲宽度为490 ns,对应的最大单脉冲能量约为1.14 J。     

LD连续泵浦Nd:YVO4声光调Q激光器

 利用半导体激光器（LD）连续单端泵浦Nd:YVO₄晶体，实现了声光调Q输出1 064nm的短脉冲。分析并用实验验证了不同透过率输出耦合镜及不同重复频率条件下，输出调Q脉冲能量、脉冲宽度及平均输出功率的规律。在泵浦功率为20.7W，重复频率为50kHz时，获得了最大平均输出功率为5.72W的脉冲，光 光转换效率为28%，斜效率为32.4%；在重复频率为10kHz时，最大单脉冲能量为0.286mJ，脉宽为22ns，峰值功率为13kW。     

Passively Q-Switched Nd：KLuW Laser with Semiconductor Saturable Absorber

We demonstrate a passively Q-switched Nd：KLu W laser with a semiconductor sat urable absorber mirror （SESAM） at wavelength 1070 nm. At a pump power of 1.3 W, the pulse width is measured to be about 17ns with repetition rate of lOkHz and with the average output power of 260roW. To our knowledge, this is the first demonstration of Nd：KLuW used for passively Q-switched laser with an SESAM.     

High-repetition-rate Nd:YVO4 slab laser with a 1-D top-hat output beam

A high-repetition-rate electro-optic Q-switched Nd:YVO₄ slab laser is demonstrated in this paper. The Nd:YVO₄ slab inside the compact resonator is end-pumped by a 2-bar laser diode stack. The output beam with one dimension (1-D) top-hat intensity distribution at both near field and far field is generated. Continuous wave (CW) output of 13 5 W is obtained under the total pump power of 50 W. At the repetition rate of 40 kHz, the energy per pulse is 0.32 mJ with its pulse width of 26.3 ns. At 20 kHz, we have achieved the maximum pulse energy of 0.56 mJ and 56 kW peak power with 10 ns pulse width.     

Compact and efficient diode-pumped passively Q-switched Nd:GdVO_4 laser at 1.06μm

Diode-pumped passively Q-switched Nd:GdVO4/Cr4+:YAG lasers with a simple flat-flat cavity were demonstrated. The maximum average output power at 1.06 μm was 1.25 W. The highest peak power and pulse energy were 7.56 kW and 75μJ, respectively, with the pulse repetition rate of 11.1 kHz and pulse width of 10 ns at the incident pump power of 8 W.     

Compact efficient diode-pumped Nd:YVO4 Q-switched blue laser with intracavity frequency tripling

We demonstrate a compact efficient diode-pumped acousto-optically Q-switched intracavity-frequency-tripled Nd:YVO₄ blue laser. The optimum polarization state is experimentally investigated to optimize the output performance. Greater than 280 mW of 447-nm average power at a repetition rate of 25 kHz was generated with a 15-W diode pump power. At 25 kHz, the pulse width is shorter than 15 ns and the peak power is higher than 800 W.     

连续激光二极管抽运的调Q高重复率Nd:YAG激光器研究

报道了由１５Ｗ连续激光二极管端面抽运的Ｎｄ：ＹＡＧ激光器,自由运转时输出功率达到４．５Ｗ,斜效率达到４４％,声光调Ｑ的重复率由３～６５ｋＨｚ可变。１０ｋＨｚ时,峰值功率达到２８ｋＷ,脉宽８ｎｓ。还分析了激光二极管抽运的声光调Ｑ高重复率激光器设计中的几个重要因素。从理论上分析了不同频率时激光单脉冲能量、斜效率产生区别的主要原因。     

10kW峰值功率高脉冲能量全光纤结构2μm掺铥光纤激光器

基于增益开关技术在高掺杂浓度掺铥光纤中获得了稳定的2μm种子脉冲激光,输出激光中心波长为1 979.4nm,脉冲重复频率在1~100kHz之间可调,输出脉冲宽度变化范围为60~200ns。采用两级掺铥光纤放大器对该种子脉冲激光进行放大实验,当种子脉冲激光重复频率为20kHz时获得最大输出平均功率为17.2W,输出光谱没有观察到明显的放大自发辐射噪声。最大功率输出时,脉冲宽度为82ns,对应单脉冲能量为0.86mJ,脉冲峰值功率高于10kW。