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

We have developed an efficient room-temperature 10 at-% Yb:YAG thin chip (7 mm×7 mm×1 mm) laser operating at 1.053 μm pumped by a Ti-sapphire laser operating at 940 nm. 320 mW of output power was obtained for an absorbed pump power of 791 mW. The slope efficiency was 54%, and extrapolated threshold power was 203 mW.     

无展宽器的高重复率钛宝石啁啾飞秒脉冲再生放大器的研究

通过优化放大腔结构参数和采用高光束质量的泵浦激光,依靠放大器腔内各个元件的色散展宽种子脉冲, 用钛宝石作为增益介质, 在低泵浦能量下, 实现了高光束质量,高稳定的中等能量的高重复率飞秒脉冲再生放大. 将钛宝石晶体离焦放置,有效的避免了光学损伤. 在1.1 mJ的绿光泵浦下, 获得了2 ps, 120 μJ, 重复频率为1 KHz, 光谱带宽7.8 nm的放大脉冲, 用石英棱镜对压缩可得到130 fs的激光脉冲.     

Generation of Stable Near－infrared and Violet Femtosecond Pulses from a Self－mode－locked Ti：Sapphire Laser

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4.5MW小型化全固态腔倒空飞秒掺钛蓝宝石激光器

研制了国内首台腔倒空克尔透镜自锁模掺钛蓝宝石激光器,该激光采用二极管抽运的全固态连续波532nm激光抽运.在5.4W的抽运功率下,获得了峰值功率大于4.5MW、脉宽小于18fs的稳定锁模脉冲,其重复频率可低至20kHz,所占尺寸约53.5cm×20.5cm.据知,此结果是迄今重复率最低、结构最紧凑的声光腔倒空飞秒激光器件 关键词： 掺钛蓝宝石 腔倒空 飞秒脉冲 克尔透镜锁模     

脉冲钛宝石激光器的双波长运转

报道了脉冲钛宝石激光器的双波长可调谐运转，双汉总能量达到４１．８ｍＪ，调谐范围大于１００ｎｍ并且研究了双波长运转时的竞争效应，增益损耗的影响，时域特性等。     

Threshold Property of Photoresist Film for Two-photon Optical Memory

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A mid-infrared spectrometer based on difference frequency generation

A mid-infrared spectrometer operating in the range from 3.42 to based on difference-frequency mixing of a tunable Ti:Sapphire laser and a diode-pumped monolithic Nd:YAG laser in periodically poled LiNbO₃ (PPLN) crystals was developed. A system line width of about 36 MHz was obtained. An energy conversion efficiency of 0.6 mW/W² was obtained at . The direct absorption spectra of pure methane and pure carbon dioxide samples were measured to test the performance of the spectrometer.     

低重复频率激光放大系统中再生腔的结构性能及实验研究

本文从高斯光束的理论出发,充分考虑到放大介质的克尔非线性效应的影响,引入了一个与之相应的非线性传输矩阵,对低重复率的钛宝石激光放大系统中的再生腔的结构性能进行了分析研究。并以此为根据,在实验上设计了激光放大再生腔,实现了TEM_oo模激光振荡,并得到了腔倒空脉冲。     

提高灯泵钛宝石激光器效率的技术途径

介绍了几种提高灯泵钛宝石激光器效率的技术途径,包括脉冲氙灯参数的选取,放电电流的优化,泵浦腔几何结构的设计,光学谐振腔参数的优化和输出耦合镜最佳透过率的选取。通过以上各项技术的完善,激光效率得到明显提高,从０．５％到２％［１］。     

预脉冲灯泵钛宝石可调谐激光器

利用预脉冲技术,可减小氙灯放电初始阻抗,使主放电电流脉冲前沿变陡,脉冲包络变窄,峰值变高,泵浦能量集中,有利于灯泵钛宝石激光输出。试验证明,在低能量（４７Ｊ）注入时,电光转换效率提高１８％,输出９５０ｍＪ;在高能量（１１６Ｊ）注入时,效率提高５％,输出能量１８１０ｍＪ。该激光器可调谐范围为６９５～９４０ｎｍ。     

低功率泵浦Ti：Al2O3自锁模激光器

本文报道了低功率泵浦的Ｔｉ：Ａｌ２Ｏ３激光器实现了稳定的自锁模运转，锁模脉冲宽度为１８０ｆｓ。分析了激光器的结构及工作特性。     

钛宝石泵浦的Yb:YAG晶体的激光性能

测量了Yb:YAG晶体的光谱特性,用Ar⁺离子泵浦钛宝石激光器作为泵浦源泵浦Yb:YAG晶体,采用平平腔设计,当输出耦合镜T_1.053μm=4.26%,泵浦功率为1410mW时,得到320mW1.053μm的高效CW激光输出,斜率效率为54%,外推阈值功率为203mW。     

Upconversion in Highly Doped Er3+-Yb3+ Fiber Pumped by Ti:Sapphire Laser at 800 nm

The up-conversion processes were investigated in highly doped Er3+-Yb3+ silica fiber pumped by CW or mode-locked Ti:Sapphire laser at 800 nm band. The mechanism is different from that at 980 nm pumped band. The pumping wavelength and power dependences of green, blue and red fluorescence emission were obtained. The up-conversion efficiencies of different doped concentration were investigated. The strong infrared emissions, which limit the efficiency of up-conversion were observed.     

Upconversion in Highly Doped Er3+-Yb3+ Fiber Pumped by Ti:Sapphire Laser at 800 nm

The up-conversion processes were investigated in highly doped Er3+-Yb3+ silica fiber pumped by CW or mode-locked Ti:Sapphire laser at 800 nm band. The mechanism is different from that at 980 nm pumped band. The pumping wavelength and power dependences of green, blue and red fluorescence emission were obtained. The up-conversion efficiencies of different doped concentration were investigated. The strong infrared emissions, which limit the efficiency of up-conversion were observed.     

良性前列腺增生组织对钛宝石激光的吸收和散射特性

研究了经尿道等离子体双极电切除术(PKRP)切除和经尿道前列腺电切术(TURP)切除的前列腺增生(BPH)组织对640, 660, 680, 700, 720, 740, 760, 780, 800, 820, 840, 860和880 nm波长的钛宝石激光的光学特性及其差异,实验采用双积分球测量系统以及反向倍增法获取BPH组织的吸收和散射特性参数。结果表明：PKRP和TURP切除的BPH组织对这1３个不同波长的激光的吸收系数和约化散射系数都是随着激光波长增大而明显减小的,PKRP切除的BPH组织对这同一波长的激光的吸收系数和约化散射系数都明显较TURP切除的BPH组织对相应的波长的激光的吸收系数和约化散射系数要小,PKRP和TURP切除的BPH组织的吸收系数以及约化散射系数的最大值都在640 nm,其值分别为(0.885±0.022)和(0.955±0.024)mm-1以及(1.564±0.039)和(1.658±0.042)mm-1,其差异分别为7.91%以及6.01%,其最小值都在880 nm,其值分别为(0.443±0.011)和(0.455±0.011)mm-1以及(1.117±0.028)和(1.197±0.030)mm-1,其差异分别为2.71%以及7.16%。PKRP和TURP切除的BPH组织对660 nm的吸收系数的差异最大,其值为8.95%,其差异最小在860 nm,其值为1.75%,PKRP和TURP切除的BPH组织对800 nm的约化散射系数的差异最大,其值为9.13%,其差异最小在640 nm,其值为6.01%。     

近红外光谱范围人肝癌变和热凝固导致组织吸收和散射特性的变化

研究了人肝的癌变及热凝固导致其对710,730,750,770,790,810,830,850,870和890 nm的钛宝石激光的吸收和散射特性的变化,实验采用双积分球测量系统以及反向倍增法获取肝组织的吸收和散射特性参数.结果表明:人肝的癌变导致其吸收系数发生了显著的减小,其变化的最大值在850 nm,其值为86.12%,而变化的最小值在750 nm,其值为82.65%.正常人肝组织热凝固导致其吸收系数明显变化,其吸收系数的变化的最大值在710 nm,其值为79.55%,而变化的最小值在790 nm,其值为0.72%.人肝癌组织热凝固导致其吸收系数显著地增大,其变化的最大值在810 nm,其值为78.69%,而变化的最小值在710nm,其值为38.16%.人肝的癌变导致了肝组织的散射系数发生了显著的增大,其变化的最大值在710 nm,其值为158.37%,而变化的最小值在890 nm,其值为136.03%.正常人肝组织热凝固导致其散射系数显著地增大,其变化的最大值在890 nm,其值为632.92%,而变化的最小值在710 nm,其值为587.40%.人肝癌组织热凝固导致其散射系数显著地增大,其变化的最大值在810 nm,其值为384.25%,而变化的最小值在710 nm,其值为330.86%.肝组织的吸收和散射特性的变化也随着激光波长的变化而变化.     

半绝缘等离子体波导太赫兹量子级联激光器工艺研究

采用气态源分子束外延设备生长了GaAs/AlGaAs束缚态到连续态跃迁结构的太赫兹（THz）量子级联激光器（QCL）有源区结构,研究了半绝缘等离子体波导THz QCL的器件工艺,采用远红外傅里叶变换光谱仪以及探测器测量了器件的电光特性.器件激射频率为32 THz,10 K下的阈值电流密度为275 A/cm². 关键词： 太赫兹 量子级联激光器 波导 器件工艺     

Room temperature 2 μm Tm,Ho : YLF laser

We present the results obtained with a Tm,Ho : YLF crystal, grown in the new crystals growth facility realized in the Dipartimento di Fisica of the Università di Pisa. The 2 μm laser performance has been studied for three different pump sources, a Ti : Sapphire, a diode—tuned at 792.7 nm—and a Co : MgF₂ laser, tuned at 1.682 μm.     

Development of a Ti:Sapphire DIAL system for pollutant monitoring and meteorological applications

A mobile differential absorption lidar system with SHG of Nd-YAG pumped Ti : Sapphire laser has been developed and tested. Mixing between Ti : Sapphire and Nd-YAG fundamentals extends the wavelength range to UV–vis region (250–480 nm), which is ideal to monitor tropospheric pollutants. Preliminary water vapor profiles in the near IR region (in our case 800–900 nm) are presented and discussed.     

Design of the Seed Source for High Power KrF Excimer Laser System

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