CAJ | 학술논문

针对重要的χ（2）:χ（2）级联非线性相移，在理论上论证了可以用光谱分辨的双光束耦合方法来测量χ（2）:χ（2）级联非线性相移,在实验上研究了飞秒时域级联非线性相移随波矢失配量的变化规律。这一新颖的测量方法灵敏度高、实际使用简单,应用低能量的飞秒激光振荡器，就能方便地测量微弱χ（2）晶体的级联非线性相移。
침대중요적χ（2）:χ（2）급련비선성상이，재이론상론증료가이용광보분변적쌍광속우합방법래측량χ（2）:χ（2）급련비선성상이,재실험상연구료비초시역급련비선성상이수파시실배량적변화규률。저일신영적측량방법령민도고、실제사용간단,응용저능량적비초격광진탕기，취능방편지측량미약χ（2）정체적급련비선성상이。
Aimed for the applications of χ（2）:χ（2） cascaded second-order nonlinear phase shifts, it is theoretically proved that this nonlinear phase shifts can be measured by spectrally resolved two-beam coupling. The dependence of the cascaded nonlinear phase shifts on the phase mismatching in femtosecond time scald is investigated experimently. The proposed novel approach has advantages of high sensitivity and easy to be applied. The cascaded nonlinearities of weak χ（2） crystals can be measured easily by use of low energy femotosecond laser oscillators.