摘要
本文报道以皮秒脉冲激光抽运的光参量放大器为宽带可调谐激发光源 ,直接测量非线性光学材料的双光子吸收谱的方法。光参量放大器不但可调谐谱带很宽 ,而且可用一对尼科尔棱镜很容易地实现全波段功率足够强和相等 ,使此方法的测量结果准确可靠。用此方法研究了一个新有机化合物的双光子吸收谱。
Two-photon absorption (TPA) spectrum of a new organic compound has been directly measured by an approach Of using tunable laser from an optical parameter amplifier as an excitation source. The output intensity of optical parameter amplifier can cover a broad spectra range of 400-2000 nm, and identical intensity in the whole spectral range can be easily adjusted. Therefore, the measurement based on this method is directly and reliable. The experimental results show that this compound exhibit large TPA cross section in a broad spectral range from 750 to 1100 nm. The profiles of TPA spectrum is quite similar, to that of the linear absorption spectra. The peak wavelength of TPA band has a little blue-shift compared with the twice of the peak wavelength of the linear absorption due to the different selection rules for two-photon transition and one-photon transition.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期559-561,共3页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金 (批准号 :1993 4 0 0 2和 198740 83 )
国家重点基础研究规划项目
广东省自然科学基金资助项目
