共查询到19条相似文献,搜索用时 406 毫秒
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自锁模掺钛宝石激光器的泵浦研究 总被引:1,自引:0,他引:1
对自锁模掺钛宝石激光器的原理作了较详细的描述,指出克尔透镜效应是形成自锁模的主要原因,但是,只有将克尔透镜自聚焦、振荡光参数和泵浦光参数三者结合起来考虑,才能全面了解自锁模的形成过程,本文从速率方程出发,得出了激光介质增益与光束参数的相对变化曲线,并据此来优化自锁模钛宝石激光器的设计,最后,将计算结果与实验作了比较,两者符合得较好。 相似文献
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研制了高稳定Nd∶YVO_4皮秒激光振荡器,并在15 W、808nm激光泵浦下得到6 W的连续锁模皮秒激光输出,光-光效率为40%.对该皮秒激光进行单通放大后得到14 W的基频光输出,倍频后可以得到7 W的532nm皮秒激光,用作钛宝石振荡器的泵浦源.在4.5 W的皮秒532nm激光泵浦下,结合腔外压缩,得到了脉宽为9.4fs、平均功率为150mW的脉冲序列输出.调节钛宝石振荡器的腔长使其与皮秒振荡器的腔长一致时,可实现自触发克尔透镜锁模.实验结果表明皮秒激光泵浦可以有效地触发钛宝石激光器的自动锁模,输出飞秒脉冲序列. 相似文献
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运用四阶RungeKutta法直接求解非线性介质内椭圆高斯光束传播方程组的方法分析增益介质内的克尔透镜(Kerrlens)效应,结合在增益介质外运用的线性ABCD矩阵寻找自洽解,对半导体可饱和吸收镜(SESAM)启动的高功率KLM钛宝石激光器谐振腔的像散、稳定性、光束参数、自聚焦效应和克尔自聚焦强度与腔参数的关系进行了系统的理论计算.计算结果与实验结果相符合.该计算为SESAM启动的五镜腔KLM激光器的设计和调整提供了理论依据
关键词:
克尔透镜锁模
飞秒
半导体可饱和吸收镜
五镜腔 相似文献
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结合特殊的谐振腔设计和半导体可饱和吸收镜,建成了一台低阈值的自启动掺钛宝石激光器 . 分别用3%和12%的输出耦合镜,获得了阈值低至390mW和600mW的稳定锁模脉冲输出. 采 用12%输出耦合镜,在12W抽运时,输出平均功率为114mW,对应的典型脉宽为17fs,谱宽 为47nm. 相对于以往的低阈值克尔透镜锁模激光器,锁模工作的范围区域加宽,减小了操作 难度,提高了稳定性.
关键词:
低阈值
半导体可饱和吸收镜
克尔透镜锁模
掺钛蓝宝石激光器 相似文献
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S. A. Skobelev D. I. Kulagin A. N. Stepanov A. V. Kim A. M. Sergeev N. E. Andreev 《JETP Letters》2009,89(11):540-546
A mechanism of the ionization-induced self-compression of femtosecond laser pulses propagating in a gas-filled hollow dielectric capillary has been investigated both experimentally and theoretically. In particular, the double self-compression of a laser pulse from 76 to 40 fs has been experimentally demonstrated. A theoretical model that explains the mechanism of such a self-compression and provides a good agreement with the experimental data has been developed. The model also predicts that a laser pulse shorter than 10 fs can be generated in the optimal regime with an energy efficiency exceeding the efficiency of self-compression on a filament widely discussed at present. 相似文献
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The laser trapping of a smectic-A liquid-crystal micro-droplet was spatially traced during its transient into the trapped position. The lateral and angular
orientation of the droplet were determined and followed in time during the axial descent of the micro-droplet into the stationary
trapped position using the analysis of polarization changes of the light passed through the droplet with temporal resolution
of a video refresh rate of 30 ms. The spatial resolution of 0.1-1μm has been achieved for typical laser trapping powers of
2-600 mW. The axial profile of a laser trapping force (an ellipticity of the focal spot) has been determined. The laser trapping
mechanism of smectic micro-droplets is discussed in terms of minimization of a light-droplet interaction. 相似文献
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N. M. Shaikh S. Hafeez B. Rashid M. A. Baig 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,44(2):371-379
In the present work, we have studied the spatial evolution of the aluminum
plasma produced by the fundamental (1064 nm), second (532 nm) and third (355
nm) harmonics of a Q-switched pulsed Nd:YAG laser. The experimentally
observed line profiles of neutral aluminum have been used to extract the
excitation temperature using Boltzmann plot method whereas the electron
number density has been determined from the Stark broadened profiles.
Besides we have studied the variation of excitation temperature and electron
number density as a function of laser irradiance at atmospheric pressure. In
addition, we have performed quantitative analysis of photon absorption and
vapor ionization mechanism at three laser wavelengths and estimated the
inverse bremsstrahlung (IB) absorption and photoionization (PI) coefficients.
The validity of the assumption of local thermodynamic equilibrium is
discussed in the light of the experimental results. 相似文献
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H. C. Pant S. Sharma T. P. S. Nathan T. Desai 《Applied Physics A: Materials Science & Processing》1980,23(2):183-187
Optical energy balance in plasmas produced by irradiating solid targets by highpower laser pulses, has been experimentally
determined. The total light scattered has been measured as a function of the laser intensity and the irratiated spot diameter.
It has been found that the net light absorption does not depend on the laser intensity alone, but is also affected by the
irradiated spot area. It has also been observed that diffuse back reflection becomes a dominant loss mechanism at high incident
flux and small irradiated spot area. 相似文献
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StudiesonthePlasmaShieldingof1.06μmLaserontheAluminumTargetLUJian;NIXiaowu;HEAnzhi(DepartmentofAppliedPhysics,NanjingofScienc... 相似文献
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根据红外光学系统的会聚特性,用光学增益方法分析了红外系统中各元件对应的光强分布,确定了位于焦面附近光学元件是激光破坏的易损部件,并提出了强激光对红外系统元件损伤,造成其探测、制导功能失效的硬破坏机理;由红外滤光片、探测器和信号处理电路与入射激光波长的光谱响应分析,提出了弱激光对红外系统干扰,导致其探测、制导功能在激光辐照一段时间内失效的软破坏机理;开展了激光辐照红外系统的失效验证实验,较好地解释了其失效的机理和效应。 相似文献
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A physical model has been established for calculating the electronic transportation in nano structured material when it is irradiated by a laser pulse with a power density in a magnitude of GW/cm2. The Monte Carlo technique has been selected to deal with the electron scattering process. In the process of electrons absorbing laser energy, a surface scattering resonance absorption mechanism and a small-size effect can be found. The regularities of electron energy changes with laser wavelength, structure dimension, and orientation of nano-line have been analyzed. 相似文献