NONLINEAR INTERACTION OF LASER BEAM WITH SOLIDS
Final rept. for 1 Apr 1963-30 Jun 1965
PURDUE UNIV LAFAYETTE IN SCHOOL OF ELECTRICAL ENGINEERING
Pagination or Media Count:
This project deals with two types of nonlinear interaction of intense laser beam with dielectric medium. The first and extensively studied phenomenon is the nonlinear dc polarization that is caused by the second order nonlinear polarization. The quartz crystal is choses as the dielectric medium. A quantitative relationship between the dc polarization and the intensity of the propagating laser beam is given. A convenient method of detecting dc polarization is presented. It is shown that the output voltage of the detector is linearly proportional to the intensity of the laser pulse. The second type of nonlineaar polarization presented in this report is the initiation of a study on the generation of subharmonics at optical frequencies using high intensity laser sources. The physical mechanism that is utilized for this purpose is the nonlinear interaction of electromagnetic radiation with certain types of crystalline media such as quartz and KDP. This nonlinear interaction results in parametric subharmonic generation under favorable conditions. The experimental arrangement used for this investigation is outlined.
- Lasers and Masers