Institute of Physics, National Academy of Sciences, 03 650, Kyiv, Ukraine.
Opt Lett. 2012 Oct 1;37(19):4065-7. doi: 10.1364/OL.37.004065.
Self-diffraction with the appearance of higher diffraction orders is discovered when writing a grating with a single sub-100 fs pulse in a nominally undoped Sn(2)P(2)S(6) sample. The short time of grating development, dependence of diffraction efficiency on the recording light intensity, correlation of wavelength dependence of efficiency with the spectrum of the two-photon absorption (TPA) constant, and a π phase shift of the diffracted beam allow for attributing the recorded grating to a dynamic amplitude grating of TPA.
当用单个亚 100fs 脉冲在标称未掺杂的 Sn(2)P(2)S(6)样品中写入光栅时，发现出现了更高衍射级别的自衍射。光栅发展的短时间、衍射效率对记录光强度的依赖性、效率的波长依赖性与双光子吸收（TPA）常数光谱的相关性以及衍射光束的π相移，使得记录的光栅归因于 TPA 的动态振幅光栅。
