Ultrafast optical Kerr effect of the C 60 -PAN copolymer film

Non-resonant third-order non-linear optical properties of amorphous GeSe2 film

“…Thus, without the quarter-wave plate, the local oscillator is E lo = i/E probe . For I / 2Re½iv ð3Þ I pump ðE Ã probe E lo Þ [22], the out-of-phase local oscillator probes (v (3) ) R , the in-phase local oscillator probes (v (3) …”

“…Using Eq. (2), the (v (3) ) R and (v (3) ) I values of the amorphous GeSe 2 film can be deduced. The value of (v (3) ) R for CS 2 is 0.67 · 10 À13 esu (whose v (3) is positive) [23].…”

“…The current surge of interest in the field of non-linear optics is derived both from a quest for fundamental understanding of the non-linear processes and its importance in the technology of photonics [1][2][3][4][5][6]. Most applications of non-linear optical materials utilize a field (electronic or optical) dependence of the refractive index (or bulk susceptibility) in a medium to produce effects leading to optical modulation and optical switching for information processing.…”

“…Because of its high refractivity, an amorphous chalcogenide semiconductor is one of the most promising non-linear media. So the measurement of third-order susceptibility v (3) in these materials is valuable for applications in optoelectronics. A number of approaches for measuring the magnitude and dynamics of third-order optical non-linearities have been developed in the past years.…”

“…A number of approaches for measuring the magnitude and dynamics of third-order optical non-linearities have been developed in the past years. These approaches include the z-scan [11,12], non-linear interferometry [13], degenerate four-wave-mixing [14], nearly degenerate three-wave mixing [15], ellipse rotation [16] and beamdistortion [17] detected signal depends on the quadrate of the complex non-linear susceptibilities v (3) , so the real and imaginary parts can not be separated. It is essential to determine the magnitudes and the signs of both the real and the imaginary parts of v (3) to understand the dynamics of non-linear well.…”