Ducharme S
Opt Lett. 1991 Nov 15;16(22):1791-3. doi: 10.1364/ol.16.001791.
A new physical mechanism is proposed for generating transient phase gratings in transparent pyroelectric materials. The mechanism combines the pyroelectric and electro-optic effects to convert spatial intensity variations into transient phase gratings. The grating diffraction efficiency increases with a figure of merit that is proportional to the pyroelectric, electro-optic, and absorption coefficients and is inversely proportional to the specific heat. The grating response time is proportional to the specific heat and inversely proportional to the thermal conductivity. Diffraction efficiencies that approach unity are predicted in several readily available electro-optic materials with modest pulse energies from Q-switched Nd:YAG lasers. Observation with cw laser sources is also proposed. The pyro-electro-optic mechanism is compared with other known mechanisms.
提出了一种在透明热释电材料中产生瞬态相位光栅的新物理机制。该机制结合了热释电效应和电光效应，将空间强度变化转换为瞬态相位光栅。光栅衍射效率随品质因数增加，该品质因数与热释电系数、电光系数和吸收系数成正比，与比热容成反比。光栅响应时间与比热容成正比，与热导率成反比。预计在几种易于获得的电光材料中，利用调Q Nd:YAG激光器的适度脉冲能量可实现接近1的衍射效率。还提出了用连续波激光源进行观测。将热电光机制与其他已知机制进行了比较。
