LD泵浦NYAB自倍频激光器和双波长激光器

研制出国内第一台用ＬＤ泵浦的ＮＹＡＢ自倍频激光器和双波长激光器。采用直接耦合方式进行端面泵浦。自倍频激光器产生 ０．５３１ μｍ的绿色激光，基横模运转，阈值泵浦功率为 １４．３１ ｍＷ，输出功率达 ２．２ ｍＷ，斜效率达 ２．１％。双波长激光器同时产生 ０．５３１ μｍ的绿色激光和 １．０６２ μｍ的近红外激光，基横模运转，阈值泵浦功率为１４．８１ ｍＷ，输出功率达 ９．２ ｍＷ，斜效率达 ７％。     

一种LD泵浦的新型自倍频激光器─M－NYAB与NYAB自倍频激光器的对比

研制成功世界上第一台ＬＤ泵浦的Ｍ－ＮＹＡＢ自倍频激光器。比目前ＬＤ泵浦的ＮＹＡＢ自倍频激光器性能更好：输出波长为０．５３１μｍ的绿色激光，容易得到基横模运转，阈值泵浦功率降低三分之一以上，为８．２ｍｗ，输出功率达到２２．５ｍＷ，斜效率达３．８％。文中简单报导了实验结果。     

钛宝石激光端面泵浦钕掺杂钒酸钇薄片激光器

报道了采用σ偏振钛宝石激光端面泵浦ａ切割掺钕钒酸钇薄片激光器中的偏振热透镜补偿特性研究，在常温下获得２ｍＷ低阈值、大于５０％的高光－光转换效率的连续基横模运转，在８８０ｍＷ注入泵浦功率下，输出４４０ｍＷ的ＴＥＭ００模激光．同时，研究了随着泵浦功率的增加，激光的纵模演化特性．结果表明，以σ偏振泵浦时，π偏振的１．０６４μｍ激光功率相对波动度小于１％．     

半导体激光二极管泵浦双偏振四波长掺钕钒酸钇薄片激光

报道了半导体激光二极管泵浦四波长同时激射的双偏振ｃ轴切割掺钕钒酸钇薄片激光器件．激光器的起振为１１ｍＷ,光－光转换效率大于２６．５％,在４０ｍＷ的ＬＤ泵浦下输出１２ｍＷ的１．０６μｍ激光总功率．同时,研究该激光晶体结构及其薄片晶体的４Ｆ３／２→４Ｉ１１／２跃迁荧光发射光谱,阐明多波长同时激射与双偏振产生的物理机制．     

激光二极管泵浦的调 Q Nd:YVO_4绿激光器

研制成用激光二极管泵浦的声光调Ｑ的Ｎｄ：ＹＶＯ４腔内倍频激光器，得到了ＴＥＭ００模、频率高达１００ｋＨｚ的稳定的５３２ｎｍ绿激光脉冲系列输出，阈值泵浦功率２７ｍＷ；在连续５７０ｍＷ的泵浦功率下，绿激光脉冲的峰值功率１．１ｋＷ，脉宽４．６ｎｓ；输出功率稳定，在±５℃的工作温度变化下，输出功率变化小于±２％。实验发现：在一定的泵浦功率范围内，随着泵浦功率的增加，１．０６４μｍ基频光的输出能量逐渐增加到一个最大值，然后又逐渐降低；而５３２ｎｍ倍频光的输出能量却一直单调增加；同时激光脉冲宽度也逐渐减小，趋向一个最小值；倍频光脉冲宽度远小于基频光脉冲宽度。声光调制器的质量对器件性能有很大的影响。     

用于超短脉冲放大的掺铒光纤放大器的研究

本文报道了用１４６９ｎｍ激光二极管泵浦的掺铒光纤放大器应用于超短光脉冲放大的实验结果．对１．５５μｍ，２．４ＧＨｚ的信号光，增益为１８ｄＢ，最大输出信号峰值功率可达４０ｍＷ，光脉冲经放大器后波形没有畸变，放大后的光脉冲实现了５３Ｋｍ的光孤子传输．     

用于超脉冲放大的掺铒光纤放大器的研究

本文报道了用１４９ｎｍ激光二极管泵浦的掺饵光纤放大器应用于超短光脉冲放大的实验结果，对１．５５μｍ２．４ＧＨｚ的信号光，增益为１８ｄＢ，最大输出信号峰值功率可达４０ｍＷ光脉冲经放大器后波没有畸变，放大后的光脉冲实现了５３Ｋｍ的光孤子传输。     

掺铒光纤红外激光器的实验研究

掺饵光纤是一种有源光纤，插入光学谐振腔内可产生激光振荡。我们研制了Ｆ－Ｐ型谐振腔和环形谐振腔，对掺饵光纤激光进行了实验研究。实验中，使用氩离子激光泵浦，当入纤功率约为３０ｍＷ时，波长为１５３６ｎｍ的红外激光输出为１ｍＷ以上，激光阈值为８ｍＷ，斜率效率大于６％。     

全光纤调Q激光器的实验研究

介绍了一种采用马赫－曾特尔干涉仪结构实现调Ｑ的光纤激光器．其中,马赫－曾特尔干涉仪由两个３ｄＢ耦合器和两段光纤（作为干涉仪的双臂）构成．在泵浦功率为３０ｍＷ时,得到了稳定的激光输出,最高脉冲功率达２．６Ｗ,平均功率为１ｍＷ．当重复频率低于１ｋＨｚ时,在１５５７ｎｍ波长处得到光脉冲,半宽为４．２μｓ．此外,在调Ｑ脉冲包络内观察到了自锁模现象．     

LD 泵浦 Nd : YLF 激光器研究

报道了半导体激光器纵向端面泵浦Ｎｄ：ＹＬＦ激光器的实施方法和实验结果。自行设计制作了ＬＤ自动温控电路和保护电路。在增益介质Ｎｄ：ＹＬＦ长度仅为０．５６ｍｍ时，获得波长为１．０５３μｍ，线偏振激光输出１１ｍＷ，光┐光转换效率约为４％。     

一个新的结构参数在无机化学中的应用

定义了新的原子参数Wt和分子结构参^mW,并与碱金属卤化物、水合离子的物理化学性质作相关性研究得到很高的相关系数．依据最小二乘法建立的回归方程在α=0.01下通过F检验，因此，分子结构参^mW能够用于预测化合物和离子的性质．     

75 mW robust single frequency Yb-doped DFB fiber Bragg grating laser

Incorporating the shielded method and post-processing method, a 75 mW single frequency Yb-doped DFB fiber laser was obtained with a 250 mW laser diode pump source at 978 nm. The threshold of the laser is 2 mW. The laser is single-polarization operation and the output power fluctuation is less than 0.2 mW in one hour when the pump power is 250 mW.     

Geothermal field and its relation with coalbed methane distribution of the Qinshui Basin

The average geothermal gradient in the Qin-shui Basin, Shanxi Province, North China, estimated from temperature logging data of 20 boreholes is 28.2±1.03℃/km. The thermal conductivities of 39 rock samples are measured and 20 heat flow values are obtained. The estimated heat flow ranges from 44.75 mW7m2 to 101.81 mW/m2, with a mean of 62.69±15.20 mW/m2. The thermal history reconstruction from the inversion of vitrinite data, using Ther-model for Windows 2004, reveals that the average paleo-heat flow at the time of maximum burial in late Jurassic to early Cretaceous is 158.41 mW/m2 for the north part, 119.57 mW/m2 for the central part and 169.43 mW/m2for the south part of the basin respectively. The reconstruction of the buried history of the strata indicates that the age for the end of sedimentation and the beginning of erosion for the basin is 108-156 Ma, and that the eroded thickness of the strata is 2603 m in the north, 2291 m in the central, and 2528.9 m in the south of the basin respectively. The "higher in the north and the south, lower in the central" distribution pattern of the paleo-heat flow coincides with the distribution of the coal-bed methane spatially and temporally, which shows that the coal-bed methane is controlled by the paleo-geotem-perature field in the basin.     

Heat flow distribution in Chinese continent and its adjacent areas

Using a compilation of 6980 heat flow measurements, we produce a new heat flow map for the Chinese continent and its adjacent areas. We develop an objective and integrated method to interpolate the heat flow data, taking into account both the uniformity within geological units and coherency of regional heat flow. The geologic units are outlined based on Zhang et al.＇s active tectonic block model. Our heat flow model is presented in two formats： a contour map and a heat flow dataset with values on a 1 × 1° grid for the Chinese continent and its adjacent areas, reflecting detailed variations in some regions. Also provided is a resolution map which helps understand the reliability of the heat flow model. Our results reveal that （1） Heat flows in the eastern part of the Chinese continent are relatively higher than those in the western part except that in the Tibetan Plateau area. （2） Heat flows in the Ordos and North China blocks are around 60 mW/m^2, and are 50-55 mW/m^2 in South China except for the continental marginal sea regions. （3） Heat flow is the lowest in the Junggar Basin, only 35-45 mW/m^2, and is 45-55 mW/m^2 in the Tarim Basin. The results of this study provide an important dataset for studies on thermal and rheological structures of the Chinese continent and its adjacent areas.     

100 mW蓝牙模块设计

鉴于国外厂商出售的100 mW蓝牙模块产品尺寸大,而国内单位提供的100 mW蓝牙模块存在通信效果以及可靠性、稳定性方面不是很理想等问题,开发了100 mW蓝牙模块,经测试,各项功能正常,模块的发射功率达到了 18 dBm,实际通信距离超过了150 m.     

低强度脉冲超声对MC3T3-E1细胞增殖、分化和矿化的影响

 为了研究低强度脉冲超声促进MC3T3-E1细胞增殖、分化和矿化的有效性,初步筛选频率和强度参数,分别对细胞施加不同参数(频率、强度)的超声,采取CCK-8法检测细胞的增殖情况,碱性磷酸酶检测试剂盒检测分化效果,茜素红染色观察矿化效果。发现30mW/cm²和40mW/cm²的超声对细胞产生促增殖作用,50mW/cm²抑制增殖;1.5MHz和1.7MHz的较低强度组均较对照组的ALP活性有增加;1.5MHz,40mW/cm²的超声组矿化效果较其他组好。研究结果表明,低强度的脉冲超声可以提高成骨细胞株MC3T3-E1增殖、分化和矿化能力,可能是防治骨质疏松的可行手段之一。     

新颖的精密陀螺电源

针对陀螺轴承的工作状态,设计了20W的精密陀螺电源。该电源采用 SPWM调制方法、双单片机控制,用开关电源技术附加串联稳压电路,使输出功率精度达到10mW,分辨率为1mW,经实验验证,该电源性能优良,可以广泛应用于高精度的陀螺中。     

405nm蓝光高密度光存储实验研究

采用波长为405nm的蓝光半导体激光器和数值孔径为0．65的聚焦物镜,对不同激光功率下CD-RW相变材料的存储特性进行研究．结果表明,在本系统中,CD-RW相变材料记录阈值约为7．5mW,最佳记录功率为9．0mW,最终得到了约500nm的记录线宽．     

LD泵浦的单频Nd：YVO4／KTP内腔倍频激光器

使倍频晶体ＫＴＰ兼作λ／２波片,实现了Ｎｄ：ＹＶＯ４／ＫＴＰ内腔倍频激光器的单频运转,在３４０ｍＷ的泵浦功率下,获得了６ｍＷ的单频绿光输出。     

High repetition rate passively mode-locked erbium-doped fiber laser

We report a passively mode-locked high repetition rate erbium-doped femtosecond fiber laser via nonlinear polarization rotation, with a fundamental repetition rate of 101.94 MHz. The output power is 34 mW when pumped by a single mode fiber coupled laser diode at 370 mW. The spectral width is 25 nm, corresponding to a transform limited pulse width of 105 fs.