激光二极管端面抽运室温Tm,Ho:YLF连续固体激光器

报道了激光二极管端面抽运Tm，Ho：YLF固体激光器的输出特性.室温下，选用不同透过率的输出耦合镜进行了实验研究，确定了最佳输出耦合镜透过率为2%. 利用小孔扫描的方法，得到了激光远场的光强分布，证明激光为基横模输出，并且给出了热焦距随抽运功率的变化关系.通过在激光谐振腔内插入两个固体Fabry-Perot标准具的方法，获得了2μm激光的单频输出，阈值功率为250mW，在抽运功率为2.8W时，单频输出功率为118mW.此单频激光器可用作激光振荡器和激光放大器的种子源. 关键词： 激光光学 激光二极管 Tm Ho:YLF固体激光器 单频     

单模,单频连续1.3188μmNd：YAG激光器

报道了单模、单频连续１．３１８８μｍＮｄ：ＹＡＧ激光器的研制，测量了激光输出的方向性，稳定性，激光光谱及输出功率，对实验结果进行了理论分析。     

硅,锗片的激光损伤及加固研究

利用ＹＡＧ脉冲激光在二种脉宽下（１０ｎｓ、２５０μｓ），对Ｓｉ、Ｇｅ片进行了损伤研究，分别给出了表面损伤机制，并利用镀金风石膜、介质膜和激光预辐照进行加固，讨论了加固效果。     

2 ns, 351 nm激光黑腔靶受激Raman散射实验研究

 介绍了在神光Ⅱ装置上开展的长脉冲2 ns,351 nm激光与黑腔靶相互作用的实验，报道了受激Raman散射光时间分辨谱图及能量测量的实验结果。长脉冲2 ns激光注入小腔靶（Ø700 mm×1 250 mm）时，激光辐照缝靶产生的SRS光能量是激光与全腔靶作用产生的SRS光能量的1.3倍。在2 ns激光与不同尺寸黑腔靶作用的情况下，激光辐照小腔靶产生的SRS光能量比标准腔靶(Ø800 mm×1 350 mm)产生的SRS光能量高1.6倍。由于激光功率密度下降，2 ns激光打靶SRS散射光要弱于短脉冲1 ns激光打靶，但持续时间稍长。实验结果表明：长脉冲2 ns激光与标准腔靶相互作用时，等离子体“堵腔效应”比较严重，标准腔靶尺寸不再合适。     

光谱纯Y2O3,La2O3,Lu2O3中微量杂质的光致发光谱研究

测定了光谱纯稀土化合物Ｙ２Ｏ３，Ｌａ２Ｏ３，Ｌｕ２Ｏ３中微量杂质在４８８．０ｎｍ和５１４．５ｎｍ激光线激发下的光致发光谱以及在可见光４４５～７４１ｎｍ范围内吸收谱，Ｙ２Ｏ３，Ｌｕ２Ｏ３样品在４４８．０ｎｍ和５１４．５ｎｍ激光激发下都有发光效应，而Ｌａ２Ｏ３样品只在４８８．０ｎｍ激光激发下才发光，分析了结果表明，Ｙ２Ｏ３，Ｌａ２Ｏ３，Ｌｕ２Ｏ３的发光谱分别是由其存在的微量Ｅｒ＾３＋，Ｓｍ＾３＋和Ｅｕ     

Cr3+,Yb3+,Er3+共掺磷酸盐铒玻璃转镜调Q激光性质研究

研究了Cr³⁺,Yb³⁺,Er³⁺共掺磷酸盐铒玻 璃转镜调Q激光性质.三种Er₂O₃掺杂浓度的激光实验结果表明，在Er₂O₃名义掺杂浓 度为0.5wt％时，玻璃的综合激 光性质最好，重复频率为0.1Hz时，它的激光阈值功率为14.5mJ，最大输出能量为9.6mJ ，斜率效率为0.55％.在同种实验条件下，比较了Cr14和Kigre公司生产的QE-7S激光性质参数，实验表明，前者激光阈值功率稍低，而后者的斜率效率和最大输出功率略高. 关键词： 3+-Yb³⁺-Er³⁺共掺')" href="#">Cr³⁺-Yb³⁺-Er³⁺共掺 磷酸 盐玻璃 光谱性质 激光性质     

1 064, 532和680 nm波长的反射-吸收复合型防护膜的研制

 针对1 064, 532 和 680 nm波长激光， 以聚碳酸酯 （PC） 为镀膜基底， 钕玻璃激光中心波长为1 064 nm, 采用六分之一加三分之一膜系的反射膜系设计，以氧化锆为高折射率膜层材料，氯化酞菁铝掺杂的氧化硅为低折射率膜层材料，通过溶胶-凝胶法镀21层膜，并在多层反射膜与PC基底之间插入张力匹配层，实现了钕玻璃激光器1 064 nm主频和532 nm二倍频波长激光的反射，以及680 nm波长红宝石激光的同时吸收，1 064,532和680 nm波长处的透射率分别为1.67％，18.24％和2.4％。     

Cr,Tm,Ho∶YAG激光器的理论模拟

为了使CTH∶YAG激光器的设计得到更好的优化，从晶体光谱吸收特性、离子间能量转移过程及准三能级运转方式对CTH∶YAG激光器的工作特性进行了理论分析；依据速率方程理论建立了CTH∶YAG激光器运转的理论模型.模拟能量输出与试验结果较好的吻合，验证了此理论模型描述CTH∶YAG激光器运转规律的合理性.模拟结果表明：CTH∶YAG激光器的激光脉冲输出与泵浦有较长的时间延迟且伴随较强的驰豫振荡，冷却温度对激光输出产生较大的影响.     

激光通过短标尺长度薄层等离子体时的吸收,反射与透射

通过数据求解亥姆霍兹波动方程，研究了激光辐射薄膜靶产生的不同厚度、不同标尺长度的薄层等离子体对激光的反射，透射及吸收（逆轫致吸收，共振吸收）率随入射角的变化情况，小角度入射时，短脉冲（～ｐｓ量级）激光打靶产生的标尺长度较小的等离子体对激光的吸收率比长脉冲打靶时低，但在大角度入射时，短脉冲打靶时等离子体的吸收率反而比长脉冲打靶时高。     

二,三及五等分激光分束器的设计与制作

由于激光分束器在光互连系统、光盘及光多路输出系统中有广泛的应用．而用二元位相光栅制做的激光分束器不仅体积小，且使用方便，灵活耐用．因此有诱人的发展前景．我们设计二元位相光栅激光分束器的方法是从二元位相光栅复振幅透过率的一般公式出发，经过付里叶积分可得到各级衍射光的强度公式，从而列出各级强度相等并取得极大值条件的方程，再利用数值计算方法求解．这种方法不仅物理意义明确，也达到了最优化设计的结果，是目前解决这一问题的最简便有效的方法．1设计二、三及五等分激光分束器的原理对于轮廓函数为矩形的一维二元位相…     

Laser action of C,N, O,F, Cl,and Br in hollow cathode discharges

C, N, O, F, Cl, and Br red and infrared laser emission was investigated using hollow cathode discharges in gas mixtures of helium and molecules containing the corresponding atoms. A total of 33 laser lines with wavelengths from 0.7 to 2.0m was observed. Three laser lines of atomic C, five laser lines of atomic N, two laser lines of atomic Cl and five laser lines of atomic Br were observed for the first time. Dissociation charge transfer and dissociative excitation transfer are suggested as being responsible for populating the upper laser levels.     

Optically-Pumped Far-Infrared Laser Lines in Hydrazine, Methanol, Heavy Water, and Ammonia: New Laser Lines and Frequency Measurements

A far-infrared laser cavity designed to favor short-wavelength laser lines was used to generate optically-pumped far-infrared laser radiation. New far-infrared laser lines were discovered in hydrazine, heavy water, ammonia, and several short-wavelength lines previously discovered in methanol were observed. Wavelength, frequency, and relative intensity measurements were performed on laser lines in the wavelength range 42.4 to 253.7 m. Each far-infrared frequency measurement was obtained by mixing the far-infrared radiation with radiation from two reference CO₂ lasers and from a microwave synthesizer in a metal-insulator-metal diode. The pump laser was a high-Q Fabry Perot resonator oscillating on 275 grating-selected laser lines including regular, sequence, and hot band lines.     

Structural,optical, and nonlinear optical properties of indium nanoparticles prepared by laser ablation

A study of indium nanoparticles prepared by two laser ablation techniques is reported. The suspensions of indium nanoparticles were prepared using the laser ablation of bulk indium in liquids. The prepared suspensions of indium nanoparticles were analyzed by the X-ray fluorescence spectroscopy and absorption spectroscopy. The position of the surface plasmon resonance of In-containing suspensions (350 nm) was consistent with the estimations taking into account the average size of In nanoparticles (43 nm) measured using the X-ray fluorescence spectroscopy. The nonlinear optical parameters of indium nanoparticles-containing liquids were studied by the z-scan technique using a picosecond Nd:YAG laser. We compare the laser ablation in liquids with the laser ablation of indium in vacuum at the tight and weak focusing conditions of a Ti:sapphire laser and analyze the 60 nm indium nanoparticles synthesized in the latter case. PACS 42.65.An; 42.65.Hw; 42.65.Jx; 61.46.Df; 78.67.Bf     

Amplitude-squeezed, frequency-modulated, tunable, diode-laser-based source for sub-shot-noise FM spectroscopy

We have developed a frequency-modulated, tunable, amplitude-squeezed, diode-laser-based source and used it to perform FM spectroscopy on rubidium. The setup consists of a free-running diode laser injection locked by a frequency-stabilized, current-modulated diode laser. The injection-locked slave laser beam adopted the frequency spectrum of the master laser beam while rejecting residual AM in the master laser beam by more than 50 dB. Injection locking also enhanced amplitude squeezing in the slave laser beam by suppressing uncorrelated longitudinal sidemodes. The noise floor of the measurement was 0.8 dB below the shot-noise level.     

Pulse properties of a synchronously mode-locked,cavity dumped,picosecond dye laser system

A synchronously mode-locked, cavity-dumped picosecond dye laser is described. The structure and intensity of the picosecond pulses measured under different conditions are reported. It was found that the structure of the pulses from the synchronously pumped dye laser depends critically on the length of the Ar⁺ laser pulses. At the shortest Ar⁺ laser pulses of about 70 ps the dye pulses are as short as 1.1 ps. With Ar⁺ laser pulses of 200 ps the dye laser pulses contains a broad satellite pulse which contains a large fraction of the total intensity. When a cavity dumper is added to the system one gets dye laser pulses 15–20 ps long with a substructure, which indicates incomplete mode-locking. Well mode-locked 1.5–2.0 ps pulses were obtained in the red part of the dye laser action spectrum, i.e. 620–650 nm for R6G, 595–608 nm for R 110 and 657–662 nm for RB, respectively. Addition of mode-locking dyes also improved the pulse quality at some wavelengths.     

Power scaling of laser diode pumped Pr3+:LiYF4 cw lasers: efficient laser operation at 522.6 nm, 545.9 nm, 607.2 nm, and 639.5 nm

We report efficient cw laser operation of laser diode pumped Pr(3+)-doped LiYF4 crystals in the visible spectral region. Using two InGaN laser diodes emitting at λ(P)=443.9?nm with maximum output power of 1?W each and a 2.9-mm-long crystal with a doping concentration of 0.5%, output powers of 938?mW, 418?mW, 384?mW, and 773?mW were achieved for the laser wavelengths 639.5?nm, 607.2?nm, 545.9?nm, and 522.6?nm, respectively. The maximum absorbed pump powers were approximately 1.5?W, resulting in slope efficiencies of 63.6%, 32.0%, 52.1%, and 61.5%, as well as electro-optical efficiencies of 9.4%, 4.2%, 3.8%, and 7.7%, respectively. Within these experiments, laser diode-pumped laser action at 545.9?nm was demonstrated for what is believed to be the first time.     

852 nm半导体激光器InGaAlAs、InGaAsP、 InGaAs和GaAs量子阱的温度稳定性

为了提高852 nm半导体激光器的温度稳定性,理论计算了InGaAlAs、InGaAsP、InGaAs和GaAs量子阱的增益,模拟对比并研究了不同量子阱的增益峰值和峰值波长随温度的漂移。结果显示,采用In_0.15Ga_0.74-Al_0.11As作为852 nm半导体激光器的量子阱可以使器件同时具有较高的增益峰值和良好的温度稳定性。使用金属有机化学气相沉积(MOCVD)外延生长了压应变In_0.15Ga_0.74Al_0.11As单量子阱852 nm半导体激光器,实验测得波长随温度漂移的数值为0.256 nm/K,实验测试结果验证了理论计算结果。     

Laser energy density, structure and properties of pulsed-laser deposited zinc oxide films

Zinc oxide thin films were deposited on soda lime glass substrates by pulsed laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 °C. A pulsed KrF excimer laser, operated at 248 nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the laser energy density in the 1.2-2.8 J/cm² range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the laser energy density of the ablating laser. The surface roughness of the zinc oxide film increased with the decrease of laser energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the laser energy density.     

Efficient, resonantly pumped, room-temperature Er3+:GdVO4 laser

We report an efficient room-temperature operation of a resonantly pumped Er3+:GdVO4 laser at 1598.5 nm. The maximum continuous wave (CW) output power of 3.5 W with slope efficiency of 56% was achieved with resonant pumping by an Er-fiber laser at 1538.6 nm. With pumping by a commercial laser diode bar stack, a quasi-CW (QCW) output of 7.7 W and maximum slope efficiency of ~53% versus absorbed pump power were obtained. This is believed to be the first resonantly (in-band) pumped, room-temperature Er3+:GdVO4 laser.     

Construction, operation and output characteristics of a small, long-life, cataphoretic HeSe laser

The properties and main design features of a small, cataphoretic HeSe⁺ laser are described. By improving both the He buffer gas containment and the Se vapour deposition, laser life can be increased considerably to several thousand hours. The length of the active laser region can be reduced to 100 mm without appreciable loss in single pass gain by reduction of the capillary diameter to 1 mm. Up to 3 mW laser power in six blue-green and green Sell lines can be extracted from this small active volume. By synchronizing the spontaneous discharge striations in the He-Se vapour mixture, laser noise is reduced to less than 3% r m s. A few potential applications for this type of laser are listed to encourage commercial interest.