Status rept. for 1 Oct 63-30 Sep 64,
PURDUE RESEARCH FOUNDATION LAFAYETTE IND
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It has been established that when a high energy laser pulse traverses a crystalline medium that lacks inversion symmetry, a d.c. polarization is developed in the medium. By measuring the d.c. polarization, an estimate of the nonlinear polarization coefficient was expected to be obtained. One of the two second order nonlinear coefficients was measured using a medium powered 4 to 8 joules laser. This laser was acquired with the supplementary funds provided by the school. A high power laser delivering more than 100 joules has been built in the laboratory that would facilitate doing better experimental work in the laboratory. Some of the early results are being checked with the high power laser that was recently built. The advantage of using this laser is that the requirements on the gain bandwidth of the detecting system is considerably less and better accuracies can be achieved. A preliminary investigation has been initiated on the feasibility of generating subharmonics by passing the laser beam through nonlinear medium.