Ti:sapphire Regenerative Amplifier at 1.056 μm

The design and performance of a Ti:sapphire regenerative amplifier operating at 1. 056 μm are described. A laser pulse with an initial pulsewidth of 100 fs is amplified to ≥1.5 mJ in the amplifier after firstly stretched to 850 ps. The amplified pulse can be re-compressed to ～300 fs with energy of ～1 mJ. Loss of the spectrum happens in the regenerative cavity since bandwidth of the coat of optics in the cavity is not enough adequate.     

Demonstration of joule-level chirped pulse amplification based on tiled Ti:sapphire amplifier

A novel tiled Ti:sapphire(Ti:S)amplifier was experimentally demonstrated with>1 J amplified chirped pulse output.Two Ti:S crystals having dimensions of 14 mm×14 mm×25 mm were tiled as the gain medium in a four-pass amplifier.Maximum output energy of 1.18 J was obtained with 2.75 J pump energy.The energy conversion efficiency of the tiled Ti:S amplifier was comparable with a single Ti:S amplifier.The laser pulse having the maximum peak power of 28 TW was obtained after the compressor.Moreover,the influence of the beam gap on the far field was discussed.This novel tiled Ti:S amplifier technique can provide a potential way for 100 PW or EW lasers in the future.     

Tunable Sum Frequency Mixing of a Ti∶sapphire Laser and a Nd∶YAG Laser

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｉ∶ｓａｐｐｈｉｒｅｌａｓｅｒｉｓｔｈｅｍｏｓｔｗｉｄｅｌｙｔｕｎａｂｌｅｌａｓｅｒｉｎｔｈｅｃｕｒｒｅｎｔｌａｓｅｒｔｅｃｈｎｏｌｏｇｙａｎｄｈａｓａｔｕｎｉｎｇｒａｎｇｅｆｒｏｍ 0 .68ｔｏ 1 .1 μｍ .Ｓｏｉｔｉｓ ｑｕｉｔｅｉｍｐｏｒｔａｎｔａｎｄｕｓｅｆｕｌｗｉｔｈｎｏｎｌｉｎｅａｒｏｐｔｉｃａｌｆｒｅｑｕｅｎｃｙｃｏｎｖｅｒｓｉｏｎｔｅｃｈｎｏｌｏｇｙｔｏｅｘｐａｎｄｉｔｓｏｕｔｐｕｔｗａｖｅｌｅｎｇｔｈ .Ｎｏｎｌｉｎｅａｒｗａｖｅｌｅｎｇｔｈｃｏｎｖｅｒ…     

Ti∶Sapphire Pumped 10 at-% Yb∶YAG Thin Chip with 320 mW CW laser output of 1.053 μm

Ｙｂ3 ｄｏｐｅｄｓｏｌｉｄｓｔａｔｅｍａｔｅｒｉａｌｓａｒｅａｔｔｒａｃｔｉｖｅａｓｇａｉｎｍｅｄｉａｏｆｈｉｇｈｅｆｆｉｃｉｅｎｃｙａｎｄｈｉｇｈｐｏｗｅｒｗｉｔｈｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆＩｎＧａＡｓｌａｓｅｒｄｉｏｄｅ.Ａｍｏｎｇｔｈｅｎ?..     

A 1.107 μm Yb~(3 ) doped Phosphate Fiber Laser Pumped by a Ti:sapphire

A 1.107 μm Yb~(3 ) doped Phosphate Fiber Laser Pumped by a Ti:sapphire     

LD泵浦Nd∶YVO_4/V∶YAG被动调Q1.34μm激光器

利用新型实用的晶体材料V∶YAG作为被动调Q元件,实现了激光二极管泵浦Nd∶YVO4的1.34μm激光谱线调Q运转.研究了饱和吸收体小信号透过率对激光稳定性的影响,得出使用小信号透过率T0小的V∶YAG可使激光脉冲能量和重复频率稳定的结论.在1.6W的泵浦条件下,T0为96%、89%和85%时,4h脉冲能量和重复频率稳定性分别为15%、10%和5%.使用T0为85%的V∶YAG,获得了平均功率输出功率96mW,脉宽8.8ns,重复频率25kHz,峰值功率436W,脉冲能量3.84μJ的实验结果.     

Upconversion in Highly Doped Er~(3 )-Yb~( 3 ) Fiber Pumped by Ti∶Sapphire Laser at 800 nm

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｅｉｎｆｒａｒｅｄｔｏｖｉｓｉｂｌｅｕｐｃｏｎｖｅｒｓｉｏｎｐｒｏｃｅｓｓｅｓｉｎｒａｒｅｅａｒｔｈｄｏｐｅｄｆｉｂｅｒｈａｖｅｂｅｅｎａｔｔｒａｃｔｉｎｇｇｒｅａｔｉｎｔｅｒｅｓｔｂｅｃａｕｓｅｏｆｉｔｓａｐｐｌ?..     

2.8μm增益开关Er∶ZBLAN光纤激光器的数值模拟

建立了适用于2.8μm增益开关掺Er~(3+)的氟化物光纤(Er∶ZBLAN)激光器的计算模型,并进行了数值模拟。模拟发现存在最佳输出镜透过率使得输出功率最大,同时耦合率也影响脉宽、峰值和脉冲形态。模拟了抽运功率对脉冲形态的影响,发现弱抽运时两个抽运周期内仅出现一个信号光脉冲,而强抽运时一个抽运周期内出现多个信号光脉冲的现象。通过模拟发现了若干未被实验报道的新现象和规律,如耦合率对输出功率、能量、脉冲形态的影响规律;抽运功率阈值附近会出现与抽运周期一致的弱信号脉冲等。研究表明,在适当耦合率和抽运功率时,2.8μm Er∶ZBLAN激光器可以实现稳定增益开关脉冲输出。     

变反射率镜非稳腔可调谐Ti∶Al2O3激光器

将变反射率镜 (VRM)非稳腔成功地应用于可调谐Ti∶Al2 O3 激光器 ,有效地提高了Ti∶Al2 O3 激光的光束质量 ,并利用LBO晶体作为倍频器获得了 396nm～ 44 0nm的蓝色可调谐激光输出 ,最大输出能量为 2 6mJ ,最高倍频效率为 2 7.2 %。     

1.5μm Ti:LiNbO_3光波导TE_0模偏振器

在1.523μm波长He-Ne激光,对于Z切Ti扩散LiNbO_3光波导及其带有金属包覆/介质缓冲层的偏振器结构,理论上计算了单模波导的工艺参数和基模的吸收损耗系数.文中用TM_0模的共振吸收效应,在1.5μm波长首次研制成Ti:LiNbO_3光波导TE_0模偏振器.当器件长度为2mm和9mm时,其消光比分别为20dB和25dB.     

半导体激光泵浦的Nd∶YVO_4激光器的1．064μm高效率连续输出

报道了半导体激光端面泵浦的Ｎｄ∶ＹＶＯ４激光器获得线偏振的１．０６４μｍ激光高效率连续稳定输出。在半导体激光功率为１．５Ｗ时，获得连续输出功率为８３７ｍＷ的ＴＥＭ００模，激光器泵浦阈值功率为１４０ｍＷ，斜率效率达６１．５％，光－光转换效率达５６％，电－光转换效率达１５％。     

光纤耦合二极管端泵2μm CW双掺Tm,Ho∶GdVO_4激光器

同YLF和YAG基质相比,在TmHo∶GdVO4晶体中Tm3+离子在800nm附近有非常强的和宽的吸收带,所以该晶体非常适合商品化的GaAlAs激光二极管泵浦.在液氮制冷晶体条件下,利用光纤耦合激光二极管及消色差光学耦合系统端面泵浦双掺5%Tm,0.5%Ho∶GdVO4晶体,在泵浦功率14W、泵浦波长794nm时,实现了2.048μm激光输出,连续运转输出功率3.6W,相应的光光转换效率为25.7%,斜率效率26.6%.相对于吸收的泵浦功率,光光转换效率为35%.由于Tm3+离子间的交叉弛豫效应,泵浦量子效率达到1.3.     

Design of efficient single-stage chirped pulse difference frequency generation at 7 μm,driven by a dual wavelength Ti:sapphire laser

We present simulations for a design of a high-energy single-stage mid-IR difference frequency generation adapted to a two-color Ti:sapphire amplifier system. The optimized mixing process is based on chirped pulse difference frequency generation (CP-DFG), allowing for a higher conversion efficiency and reduced two-photon absorption losses. The numerical start-to-end simulations include stretching, chirped pulse difference frequency generation and pulse compression. Realistic design parameters for commercially available nonlinear crystals (GaSe, AgGaS₂, LiInSe₂, LiGaSe₂) are considered. Compared with conventional unchirped DFG directly pumped by Ti:sapphire technology, we predict a threefold increase in the quantum efficiency. Our CP-DFG scheme provides up to 340 μJ pulse energy directly at 7.2 μm when pumped with 8 mJ and supports a bandwidth of up to 350 nm. The resulting 240 fs mid-IR pulses are inherently phase stable.     

产生蓝色相干辐射和实现Nd∶YAG 1.0642μm倍频90°非临界相位匹配的Nb∶KTiPO_4(英文)

本文报道了用熔盐顶部籽晶法生长Ｎｂ浓度（０～１３）ｍｏｌ％的Ｎｂ∶ＫＴＰ晶体的倍频的Ⅱ型相位匹配的截止波长和Ｎｄ∶ＹＡＧ１．０６４２μｍ及Ｎｄ∶ＹＡ１Ｏ３１．０７９５μｍ激光在这些晶体中倍频的最佳相位匹配角的测量结果．从中可看出,由于Ｎｂ５＋的引入使ＫＴＰ晶体倍频的Ⅱ相位匹配的截止波长有效蓝移,目前已使截止波长蓝移至９３７ｎｍ且有效产生４６８．５ｎｍ的倍频蓝光．同时Ｎｂ５＋的引入使Ｎｄ∶ＹＡＧ１．０６４２μｍ激光和Ｎｄ∶ＹＡ１Ｏ３倍频的最佳相位匹配方向产生很大的变化,目前已使Ｎｂ∶ＫＴＰ晶体倍频的最佳相位匹配方向为θ＝８８．３２°、Φ＝０°,非常接近于９０°非临界相位匹配方向     

Nb∶KTiOPO4 CRYSTALS：PRODUCING BLUE COHERENT RADIATION AND 90° NONCRITICAL PHASE MATCHED SECOND HARMONIC GENERATION FOR Nd∶YAG 1.0642μm LASER

本文报道了用熔盐顶部籽晶法生长Nb浓度(0～13)mol%的Nb∶KTP晶体的倍频的Ⅱ型相位匹配的截止波长和Nd∶YAG 1.0642μm及Nd∶YA1O     

激光二极管抽运的准三能级2μm(Tm,Ho)∶YLF激光器的理论研究

根据激光二极管抽运铥 ,钬 (Tm ,Ho)共掺激光器中离子之间的能量传递过程 ,建立了 (Tm ,Ho)∶YLF激光器准三能级的速率方程 ,对上转换及激光下能级粒子再吸收对激光二极管抽运 (Tm ,Ho)∶YLF激光器运转的影响进行了理论分析 ,得出了 (Tm ,Ho)∶YLF激光器的阈值抽运功率和斜率效率的解析表达式。并根据所得到的解析表达式对激光器进行了优化设计 ,分析了增益介质长度、抽运光斑半径、输出镜透过率对激光阈值和斜率效率的影响。并通过实验验证了理论的合理性。同时 ,对小信号增益进行了详尽的理论分析。