【摘要】 用自装的热透镜测量装置,观察了强脉冲激光作用下的热透镜行为。测量丙酮/水混合液中的Cocl₂,检测限为3×10^-7M,相当于6×10^-6的吸光度。将差分放大技术用于热透镜测量,降低了He-Ne激光振幅噪声的影响,改善了信噪比。更多还原

【Abstract】 The thermal lens effects based on the strong pulsed laser excitation were observed by using the home-made experimental apparatus. In acetone-water mixture concentrations of CoCl2 as low as 3×10-7M have been determined with present setup, which corresponds to an absorbance of 6×10-6. In thermal lens measurements the noise level due to shot-term instability of the He-Ne laser output amplitude can be reduced down by the use of differential amplification technique, thus the S/N ratio is improved appreciably.更多还原