| Autor: |
Van Stryland, Eric, Guha, Shekhar, Vanherzeele, H., Woodall, M. A., Soileau, M. J., Wherrett, B. S. |
| Zdroj: |
Journal of Modern Optics; April 1986, Vol. 33 Issue: 4 p381-386, 6p |
| Abstrakt: |
The simple parametric scaling rules for the two-photon absorption coefficients, β2 , predicted by recent theory, have been experimentally confirmed by the measurement of β2 in ten different semiconductors using carefully characterized picosecond 1 and 0·5 μm pulses. We find β2 (cm/GW) = (3·1 ±0·5) ×10 3 √E p F 2 (2 ћ s/ E g ) n -2 E -3 g , where E p b ≅21 eV for the semiconductors studied, E g is the energy gap in eV, n the refractive index and F 2 ( x ) = ( x -1) 3/2 / x 5 . This relation allows the prediction of β2 in other materials at other wavelengths, which is useful in the design of nonlinear optical elements. The strong self-defocusing observed is consistent with nonlinear refraction by the two-photon-generated free carriers. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
