YAG激光器泵浦钛宝石激光器和光学参量振荡器

采用一台调Q脉冲式Nd：YAG激光器同时泵浦Ti：蓝宝石激光器和光学参量振荡器（OPO），在重复频率30Hz下获得了Ti：蓝宝石可调谐激光波长为700～890nm，转换效率28．8％及440～2600nm的连续可调谐窄线宽的光参量激光输出，能量转换效率达23％。     

不同波长泵浦的掺铒Al2O3薄膜光波导1．53μm荧光特性

本文通过分析饵的能级结构,考虑了合作上转换、激发态吸收及交叉驰豫等上转换机制,给出了掺铒（Er^3 )Al2O3薄膜光波导1480nm、80nm和820nm3种泵浦波长下的速率方程,通过求稳态解,分析了3种波长泵浦时发射的1．53μm荧光特性以及合作上转换和激光态吸收对荧光的影响,结果表明利用980nm波长泵浦时可得到相对较强的1．53μm荧光,产浦强度时激发态吸收对荧光影响较大,而在高掺（Er^3 ）浓度时合作上转换占主导地位。     

激光二极管泵浦高效Nd：YVO_4激光器特性研究

报道了激光二极管泵浦高效Ｎｄ：ＹＶＯ４激光器输出功率及波长特性的研究。基频光输出２３０ｍＷ，光－光转换效率为４５％。对激光输出波长和泵浦功率的关系进行了研究，发现激光器的输出波长随泵浦功率的平均变化率约为１．０５×１０－３ｎｍ／ｍＷ。利用ＫＴＰ腔内倍频获得２９．８ｍＷ的绿光输出，光－光转换效率为１２．４％。     

1.535μmEr：Yb磷酸盐玻璃薄片连续激光器

报道了以９８０ｎｍ钛宝石激光端面泵浦室温连续１．５３５μｍＥｒ：Ｙｂ磷酸盐玻璃薄片激光器。实验上研究了９５０－９８８ｎｍ泵浦波长范围内激光输出特性，结果表明，９７５ｎｍ为最佳泵浦波长。在９７５ｎｍ泵浦下，实现了５ｍＷ低阈值起振和２１％的光－光转换效率；最大单频线偏振输出功率达２２ｍＷ。同时，观察并分析了高泵浦条件下输出激光的偏振与纵横性质，以及由泵浦吸收饱和而引起的输出功率饱和效应。     

四镜折叠腔波长可调谐连续Ti：Al2O3激光器

本工作中采用四镜折叠像散腔有效地补偿像散,用复合双折射晶片调谐波长,在约10W的氩离子蓝绿激光泵浦下。TEM_(oo)模连续Ti:Al_2O_3激光峰值功率(波长λ=790nm)大于1.65W,泵浦阈值低于1.7W,斜效率为20.26％;波长λ=790nm处,输出激光线宽约为0.0008nm,含三个纵模。用一套腔镜得到的波长调谐范围约为750～869nm。     

碘的简并四波混频信号的饱和效应研究

本文研究了常温下I2四波混频(DFWM)信号强度与泵浦光能量的关系以及0℃下I2的DFWM光谱随压强的变化．本实验采用后向四波混频光路，用脉冲Nd：YAG激光器泵浦染料激光器，其输出波长在552～570nm范围内连续可调，脉宽为10nm，激光重复频率为10Hz．通过选定I2的共振波长，改变泵浦光能量Ef，测得常温、     

二极管泵浦Nd:GdVO4晶体紫外激光器的研究

报道了用BBO晶体对激光二极管泵浦Nd：GdVO4晶体声光调Q1064nm激光进行四倍频，在泵浦功率为12．5W时，获得平均功率196mW准连续波266nm紫外激光输出，1064nm～266nm光一光转换效率为10．1％，532nm～266nm转换效率为30．1％。     

闪光灯泵浦Cr：LiCAF激光器的实验研究

实现了闪光灯泵浦Ｃｒ：ＬｉＣＡＦ激光器的脉冲运转．在最佳耦合输出条件下获得斜率效率为２．２０％、转换效率为１．３６％的激光输出。研究结果表明．对于闪光灯泵浦的Ｃｒ：ＬＩＣＡＦ激光器．较高的掺杂浓度有利于降低激光阈值并提高输出能量和效率。实验中观察到激光脉冲尖峰振荡中的类自调Ｑ现象。     

钛蓝宝石激光泵浦的Nd：YVO_4固体激光器

研究了用钛蓝宝石激光泵浦的Ｎｄ：ＹＶＯ４固体激光器的特性。得到基频连续激光输出功率为１９０ｍＷ，泵浦阈值为１３ｍＷ，光学斜效率为５１％。用ＫＴＰ晶体腔内倍频，得到二倍频激光输出功率为１０ｍＷ，总的光学转换效率为２．３％。给出了泵浦光波长（７４０～８３０ｕｍ）与激光输出功率之间的关系。     

双光子染料ps激光泵浦下的超辐射和腔激射

本文首次报道了ps激光脉冲泵浦下的有机染料的上转换腔激射，当用1064nm激光（40ps）激发有机染料PSPS[trans-4-（4′-pyrrolidinyl styryl)-N-methyl pyridinium methyl sulfate]时，可以得到中心波长分别为615nm和620nm的超辐射和腔激射，用再吸收现象解释了腔激射相对超辐射的红移现象，用不同条件下再吸收系数的不同解释了超辐射和腔激射相对双光子荧光的蓝移。该染料的399ps的荧光寿命有利于腔激射的产生。我们得到了远大于泵浦光脉冲宽厚的200ps激光振荡，并对此现象进行了解释。     

The influence of pump wavelength on Er:YAG Green-emitting laser characteristics

Mathematical modeling is used to study the influence of pump wavelength on the emission of an Er(0.5 at.%):YAG laser on the transition /sup 4/S/sub 3/2//spl rarr//sup 4/I/sub 15/2/ (561 nm). Three pump wavelengths (direct pumping: 488 nm, upconversion pumping: 800 and 810 nm) are investigated and the corresponding laser emission regimes are discussed. For upconversion pumping, we find an optimum pump wavelength and optimum resonator losses for lowering of the continuous-wave emission threshold.     

Er3+:YAlO3 upconversion laser

Upconversion lasing in Er:YAlO₃ is reported. Laser emission was produced using both sequential two-step pumping and cross-relaxation energy transfer. In addition, photon avalanche upconversion pumping was demonstrated. Selection among these pumping mechanisms is determined by the pump wavelength, and laser operation was obtained with excitation between 785 nm and 840 nm. The highest laser output power was achieved at 34°K, where 918 mW of pump power at 807 nm produced 121 mW of TEM₀₀ emission. The optical conversion efficiency was 13%. Repetitively Q-switched operation is reported, and the temporal- and temperature-dependence of the laser output is discussed     

Blue, green and yellow upconversion lasing in Er:YLiF/sub 4/ using 1.5 mu m pumping

The authors report blue, green and yellow upconversion laser action in Er/sup 3+/:YLiF/sub 4/ following pumping at 1.500 mu m below 80 K. For the blue transition the ratio of the output frequency to the input frequency is 3.3, the highest yet reported for an upconversion laser. In spite of the multiple upconversion steps, the thresholds for laser action were less than 80 mW. It is proposed that the nonlinear upconversion pumping proceeds via a sequence of several pairwise cross-relaxation steps.<>     

1.65 /spl mu/m-band optical amplification with Er/sup 3+/-doped fluorozirconate fibre using 0.8 /spl mu/m upconversion pumping

In order to expand the available bandwidth for wavelength division multiplexing transmission systems, a 1.65 /spl mu/m-band optical fibre amplifier with Er/sup 3+/-doped fluorozirconate fibre using 0.8 /spl mu/m upconversion pumping has been demonstrated. The positive gain, 3.8 dB, is the first ever achieved by means of (/sup 2/H/sub 11/2/, /sup 4/S/sub 3/2/) /spl rarr/ /sup 4/I/sub 9/2/ stimulated emission transition.     

980 nm抽运时掺铒光纤放大器中的上转换发光效应研究

采用980nm抽运的掺铒光纤放大器（EDFA）中存在上转换发光效应。能级分析和光谱扫描结果表明上转换辐射光为绿色荧光。波长为538nm和514nm，其产生机理为铒离子的激发态吸收效应（ESA）。从理论和实验两方面分析了抽运功率和信号功率这两个放大参量对上转换绿色荧光的影响，结果表明，存在一个特殊抽运功率值，当抽运功率小于该值时，上转换绿色荧光的抽运效率随抽运功率的增加而快速增大；抽运功率大于该值时，上转换绿色荧光的抽运效率变化缓慢，基本保持稳定。掺铒光纤放大器工作在线性放大状态下，输入信号的有无和功率大小对绿色荧光影响很小；掺铒光纤放大器工作在饱和状态下，绿色荧光功率随输入信号功率增加而增加。     

双光子吸收染料HMASPS上转换及非线性吸收性能的研究

从实验上研究了一种染料trans 4 [p (N hydroxyethyl N methylamino)styryl] N methylpyridinium p toluenesulfonate(简称HMASPS)双光子抽运的频率上转换及双光子吸收引起的非线性吸收情况。当抽运功率密度超过一定阈值时 ,染料发出超辐射荧光。测量了从 90 0～ 115 0nm抽运波长范围的荧光激射上转换效率和 72 0～ 110 0nm范围的非线性吸收情况。在 92 0nm处具有最大有效双光子吸收截面 44 3× 10 -4 8cm4 s/ photon ,在 10 6 4nm处为2 77× 10 -4 8cm4 s/photon。最高上转换效率 7%位于 990nm ,而在 10 6 4nm为 4 3%。     

Characteristics of Er-doped Al2O3 thin filmsdeposited by reactive co-sputtering

Er-doped Al₂O₃ thin films have been deposited by reactive co-sputtering onto thermally oxidized Si-wafers. The deposition process has been optimized with respect to the requirements originating from the application of these multilayer structures as integrated optical amplifiers for the third telecom window, i.e., the wavelength range 1.52-1.55 μm. The films obtained at a substrate temperature of only 400°C are amorphous and show a homogenous structure, without columns or grains. For slabguides, background losses smaller than 0.25 dB/cm have been obtained, even without any annealing. A relatively broad luminescence band, having an FWHM of ~55 nm around the 1.533-μm wavelength, has been measured. From gain versus pumping power curves, an upconversion coefficient lower then 20·10^-25 m³/s has been derived, being half of the values reported up to now in the literature. Simulations based on experimentally determined material parameters and assuming a channel attenuation of 0.5 dB/cm indicate, for 0.24 at.% Er channel devices with an optimal channel length of 7.7 cm, an amplification of 8 dB at 1.533 μm for a pump wavelength of 1.48 μm, and a pump power of only 8.7 mW     

包层泵浦上转换光纤激光器进展

本文在概述频率上转换和包层泵浦技术的基础上,综述了近年来频率上转换激光器进展,展望了包层泵浦上转换光纤激光器的发展前景。     

1.55-μm Ce,Er:ZBLAN fiber laser operation under 980-nm pumping:experiment and simulation

Fiber laser operating property at 1.55-μm band in a newly developed Ce,Er:ZBLAN fiber by a continuous-wave laser diode pumping at 980 nm is presented. The output characteristics of the Ce,Er:ZBLAN fiber laser system are analyzed in detail based on the rate equations model by taking into account the energy transfer between Ce³⁺ and Er ³⁺ ions, as well as the upconversion mechanisms. The promotion role of the Ce in the erbium-doped ZBLAN for the 1.55-μm band fiber laser operation has been realized     

连续钛宝石激光器波长调谐特性及斜效率的测量

采用四镜折叠驻波腔，以氩离子激光器的可见多谱线输出纵向激励，用国产钛宝石激光棒实现了连续激光运转。使用三套腔镜得到的波长调谐范围分别为６８０～７６０ｕｍ、７３０～８４０ｕｍ、９７０～１０１０ｎｍ，峰值波长约为７８０ｕｍ。当输出透射率为１１．７６％、泵浦功率约１０．０Ｗ时，获得７８０ｕｍ波长的激光最大输出功率约２．３５Ｗ，斜效率为３３．４９％。