Low-threshold dye laser pumped by visible laser diodes

The author describes a continuous-wave (CW) dye laser has been pumped by laser diodes for the first time. Two 10-mW visible laser diodes were polarization-combined to pump a rhodamine 700 dye jet laser. The absorbed pump threshold power was 5.6 mW, and 0.28 mW of output power was produced at 758 nm. The resonator was scalable and generated over 360 mW with a slope efficiency of 57% when pumped with a DCM dye laser at 660 nm     

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。     

蓝色染料激光器

研制了一台蓝色高功率单模染料激光器。当多谱线紫外Ar~+激光泵浦功率为4W时,在波长为432nm处单模输出达150mW。用这台激光器用磁场法反向照射Ca原子束,结果表明Ca原子被明显减速。     

High-peak-power 532-nm pumped dye laser

A dye laser, pumped by the second harmonic of a flash-pumpedQ-switched Nd:YAG oscillator/amplifier chain is described. The dye laser produces 8-ns-long pulses with energies as great as 140 mJ and peak powers of 20 MW. At a repetition rate of 10 pulses/s, the average power obtained is 1.4 W and the conversion efficiency (532 nm to dye) is approximately 50 percent.     

激光功率密度对低浓度若丹明6G染料激射寿命的影响

把固体染料激光器工作介质激射寿命的概念推广到液体染料激光器中,同时提出了一种针对液体激光染料激射寿命的双激光光路测试方法.该方法使用波长为532 nm的Nd:YAG脉冲激光器作为抽运光来模拟染料激光器中的抽运条件,用波长相同的低功率连续激光作为监测染料分子在抽运光作用下失效速率的手段.利用半导体制冷器件,PID温控仪和水浴槽实现了液体染料的恒温控制.测量了激光平均功率密度从6.3×103～2.2×104 W/m2变化范围内R6G染料乙醇溶液的激射寿命.实验结果表明,染料的激射寿命与抽运光功率密度成反比,比例系数可以解释为染料分解一半时,分子单位吸收截面上累积的辐照能量.用该系数表征染料的激射寿命特征更具有普遍意义.     

高效宽带混合染料激光研究

介绍了一种高效宽带的三元混合染料激光。在6.0WCuBr激光的泵浦下,无需更换染料,在590nm～670nm范围内均可获得线宽约为10nm,平均输出功率1W的染料激光,转换效率在18%以上,具有广泛的应用前景。     

重复率YAG激光脉冲同步泵浦染料激光器

用热稳定腔主被动锁模重复率脉冲YAG激光器的倍频光,同步泵浦R6G染料激光器。获得平均功率14mW,单脉冲峰值功率大于5MW,单脉冲宽度28ps,脉冲列重复率为20pps。可调范围为555.0至586.5nm,谱线宽度约0.1nm,最窄谱宽为0.04nm,转换效率11％的可调谐激光。     

354.7 nm的产生及其泵浦的可调谐染料激光器

用和频的方法从Nd:YAG激光器中产生出三次谐波,输出功率为1.7兆瓦,并用它泵浦了染料激光器。染料激光的波长可调谐范围为409.3～682.3 nm。Coumarin47染料的中心波长450.0 nm处的峰值功率大于0.60兆瓦。仅用Coumarin152一种染料,调谐范围宽达104.2 nm,与其荧光谱线宽度120.0 nm相近。     

Highly efficient 980 nm operation of a Yb/sup 3+/-doped silica fibre laser

Efficient operation of a Yb/sup 3+/-doped silica-fibre laser at 980 nm is reported. When pumped with a dye laser at 890 nm, and with a symmetrical cavity, a lasing threshold of 17 mW launched power and a single-ended slope efficiency of nearly 40% against launched pump power has been achieved.<>     

铜蒸气激光泵浦的单模脉冲染料激光器

设计了一台铜蒸气激光泵浦的单模脉冲染料激光器,介绍了它的结构,给出采用Rh6G、RhB和Kiton Red S时的实验结果。单模平均激光功率200mW,效率4.5％,线宽100MHz,覆盖范围563～642nm。     

XeCl准分子激光泵浦的无腔染料激光器和紫外-可见波段调谐染料激光器

（一）无腔染料激光器 一、引言 不使用共振腔便能得到强受激发射的光通称为放大自发辐射NIASE，一般也叫超辐射或超荧光。它是自发辐射在已形成粒子数反转分布的高增益激活介质中沿激活区轴向传播时通过感应发射过程依次行波放大所产生的。     

双棱镜扩束、光栅调谐的ps染料激光器

用重复率脉冲锁模YAG激光同步泵浦双棱镜扩束的光栅染料激光腔,对于R-6G激光染料,获得脉冲列重复率为20Hz、脉冲峰值功率为7.6MW、平均功率为9.5mW的30ps可调谐激光,其谱线宽度为0.04nm,接近变换极限宽度。激光输出稳定,调谐方便。     

基于电光调Q1064nm/532nm/570nm三波长固体激光器

为了提升激光技术在色素性疾病治疗等生物医学应用效果, 研制了一种1064nm, 532nm, 570nm三波长激光器。采用电光调Q Nd:YAG激光器获得最窄脉宽为11ns的1064nm脉冲激光输出, 使用磷酸氧钛钾(KTP)非线性晶体对基频光腔外倍频获得532nm激光输出; 以固体染料块为激光增益介质, 倍频光为抽运光, 可获得中心波长为570nm的黄光输出, 光光转换效率为61.3%。结果表明, 通过改变氙灯注入电压, 可以调节1064nm激光脉冲输出特性; 增加固体染料激光器腔长, 可以调节染料激光输出光谱特性。该研究结果对激光器灵活应用具有重要意义。     

Multipulse operation of a high average power, good beam qualityzig-zag dye laser

A laser pumped zig-zag dye laser operating at 568 nm with a pulse length ~2 μs has been sealed to high power using a MOPA configuration. Pulse energies in excess of 7 J with beam quality <2 XDL have been achieved under repetitively pulsed, 10 Hz operation. RMS jitter was measured as 0.12 of a 1 XDL spot. The device has operated with over 70 W output for runs up to 5 s. Substantially longer run times and output powers are possible. This device represents an advance in dye laser capabilities. Improvement in pointing accuracy of better than an order of magnitude have been demonstrated. In addition, an improvement in beam quality by about an order of magnitude has been achieved compared to other dye lasers operating in this power range     

固体激光与铜蒸气激光混合抽运的染料激光放大实验

采用倍频Nd:YAG绿光激光器与铜蒸气激光器混合抽运双级染料激光放大器的实验方法,通过抽运激光器精确的脉冲同步控制和匹配技术,获得了9.0W的染料激光输出,第二级染料激光放大器对抽运激光的提取效率达到了26.6%,系统总提取效率达到了13.6%.实验研究了染料激光输出功率和抽运激光提取效率随染料激光波长的变化关系.     

低强度532nm绿激光照射对小鼠腹腔巨噬细胞功能的影响

目的:观察低强度532nm激光对小鼠腹腔巨噬细胞吞噬功能的影响。方法:用不同功率和照射时间的532nm激光辐照小鼠腹腔巨噬细胞,采用中性红吞噬实验测定巨噬细胞的吞噬能力。结果:在适当的激光功率和照射时间下巨噬细胞的吞噬能力有显著性增强。结论:低强度532nm激光照射对小鼠腹腔巨噬细胞有激活作用,可增强其免疫活性。     

A continuous tunable source of coherent UV radiation

We describe a continuous tunable ultraviolet radiation source, operating in the spectral range 290-315 nm by intracavity frequency doubling of a rhodamine 6G dye laser. Maximum intracavity second-harmonic power of 1.1 mW was obtained at 296 nm with a bandwidth of 0.1 nm.     

A xenon ion pumped open dye stream laser

A pulsed xenon ion laser with an output power of 1 kW over the blue-green lines was used to pump an open dye stream laser. An efficiency of the order of 40 percent was determined in broad-band mode operation. The bandwidth in this case was 48 nm (from 582 to 630 nm).     

Single-frequency operation of a long-pulse e-beam excited XeF(C-A)laser

A 1-m gain length e-beam excited XeF(C-A) excimer laser operating in a unique reimaging ring amplifier configuration has been used to amplify an ultranarrowband single-mode dye laser pulse. Double heterodyne detection was used to simultaneously determine the single-mode injection dye laser and the amplified XeF(C-A) laser bandwidths. Fast Fourier transform (FFT) analysis of the pulses indicates that the amplifier output has the same bandwidth as the injected dye laser pulse. The bandwidth of the XeF(C-A) laser was line narrowed by 6 orders of magnitude, from a free running value of 16 nm (20000 GHz) to 20 MHz. Specific output energies of 0.7 J/l at 488 nm and 1.3 J/l at 476.5 nm were measured. Laser output pulse lengths up to 500 ns were observed