排序方式: 共有16条查询结果,搜索用时 93 毫秒
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研究了二极管抽运激光器(DPL)中抽运光的空间分布对振荡光光束质量的影响.通过对端面 抽运情形下光场运动方程的研究,发现不均匀的空间增益分布会影响激光振荡的模式,并且 使得基模振荡光偏离高斯分布.引入一个称之为抽运光影响因子参数,来判断这种影响的程 度.研究表明,这个参数计算方便而且实用.在对基模调Q脉冲激光的研究中发现,由于抽运 光的影响,脉冲前沿的场分布将由远离高斯分布向接近高斯分布变化,称之为脉冲前沿的场 倏变现象.
关键词:
激光二极管
二极管抽运激光器
光束质量 相似文献
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High sensitivity fiber Bragg grating pressure difference sensor 总被引:6,自引:0,他引:6
Based on the effect of fiber Bragg grating (FBG) pressure difference sensitivity enhancement by encapsulating the FBG with uniform strength beam and metal bellows, a FBG pressure difference sensor is proposed, and its mechanism is also discussed. The relationship between Bragg wavelength and the pressure difference is derived, and the expression of the pressure difference sensitivity coefficient is also given. It is indicated that there is good linear relation between the Bragg wavelength shift and the pressure difference of the sensor. The theoretical and experimental pressure difference sensitivity coefficients are 38.67 and 37.6 nm/MPa, which are 12890 and 12533 times of that of the bare FBG, respectively. The pressure difference sensitivity and dynamic range can be easily changed by changing the size, Young's modulus, and Poisson's ratio of the beam and the bellows. 相似文献
14.
通过建立激光介质非热平衡状态的振荡散热模型,分析了激光二极管抽运固体激光器中,热透镜的不稳定性.研究表明,热透镜的这种热不稳定性是造成激光场不稳定的重要因素.会造成高斯半径的不稳定波动,会使激光光束的指向角波动,会造成激光光斑的非对称畸变,这种畸变也处于波动之中.通过对端面抽运条件下,热耗为1W的Nd:YAG激光介质的理论和实验研究,确定了这种原因下光场不稳定度的数量级.
关键词:
激光二极管
固体激光器
热透镜 相似文献
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本文提出了一种求解本征值问题的改进边界元技术,它是将Laplace方程对应的基本解用于Helmholtz方程,从而使形成的边界元方程不隐含本征量,这样大大降低了对计算机内存的要求,并提高了求解速度。 相似文献