Author Affiliations
Abstract
1 National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
2 State Key Laboratory of Optoelectronic Materials and Technology, Sun Yat-Sen University, Guangzhou 510275
The intensity-dependent two-photon absorption and nonlinear refraction coefficients of GaP optical crystal at 800 nm were measured with time-resolved femtosecond pump-probe technique. A nonlinear refraction coefficient of 1.7*10^(-17) m2/W and a two-photon absorption coefficient of 1.5*10^(-12) m/W of GaP crystal were obtained at a pump intensity of 3.5*10^(12) W/m2. The nonlinear refraction coefficient saturates at 3.5*10^(12) W/m2, while the two-photon absorption coefficient keeps linear increase at 6*10^(12) W/m2. Furthermore, fifth-order nonlinear refraction of the GaP optical crystal was revealed to occur above pump intensity of 3.5*10^(12) W/m2.
190.4720 Optical nonlinearities of condensed matter 320.1590 Chirping 320.0320 Ultrafast optics Chinese Optics Letters
2006, 4(9): 536
Author Affiliations
Abstract
State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275
The spectral resolved femtosecond pump-probe experiment is applied to measure the third order nonlinear refractive index coefficient, two-photon absorption coefficient of GaP crystal, and the chirp parameter of the input laser pulses. The results show that nonlinear refractive index coefficient is 2*10^(-18) m2/W, two-photon absorption coefficient is 2*10^(-11) m/W at wavelength of 783.5 nm, and the chirp parameter of laser pulse is 1*10^(25) s^(-2). Furthermore, the mechanism of nonlinear refraction due to two-photon absorption in GaP crystal and experimental results are discussed.
190.4720 optical nonlinearities of condensed matter 320.1590 chirping 320.0320 ultrafast optics Chinese Optics Letters
2004, 2(6): 06354
