Nonlinear optical properties of soda-lime glass at 800-nm femtosecond irradiation
Nonlinear optical properties of soda-lime glass at 800-nm femtosecond irradiation
复制标题
800 nm 飞秒辐照下钠钙玻璃的非线性光学特性
作者：
K. Jamshidi;N. Mansour;A. Namdar
利用200飞秒激光脉冲在800 nm波长下对钠钙玻璃的非线性光学特性进行了研究。当入射脉冲能量大于65 μJ时，观察到非线性传输。飞秒非线性透射率测量被用来表征玻璃的非线性行为。三光子吸收沿着三光子产生的自由载流子在玻璃中被发现是所观察到的非线性响应的主要机制。测得其三光子吸收系数和光生自由载流子截面分别为2.1 × 10 - 23 cm 3 W-2和1.2 × 10 - 18 cm 2。用z扫描测量技术测得钠钙玻璃的非线性折射率高达3 × 10- 16 cm 2 W-1。
Nonlinear optical properties of soda-lime glass were studied by using 200-femtosecond laser pulses at 800-nm irradiation. Nonlinear transmission is observed for incident pulse energies above 65 μJ. Femtosecond nonlinear transmittance measurements were used to characterize the nonlinear behavior of the glass. The three-photon absorption along with three-photon-generated free carriers within the glass is found to be the main mechanism for the observed nonlinear response. The values of the three-photon absorption coefficient and photo-generated free-carrier cross-section were measured to be 2.1 × 10 -23 cm 3 W -2 and 1.2 × 10 -18 cm 2 , respectively. The nonlinear refractive index of the soda-lime glass was found to be as high as 3 x 10- 16 cm 2 W -1 using the z-scan measurement technique.