Electrooptic and piezooptic tuning of secondorder nonlinear processes in crystals
Abstract
The powerhandling capability of crystals utilized for second harmonic generation (SHG) and other nonlinear frequency conversions has until recently been limited to a few watts of average output power, chiefly because of two conditions, namely, thermal instability and thermal gradients. Now, techniques have been invented that correct these conditions with a resulting order of magnitude increase in the average output power produced by SHG. This paper presents the theory for two techniques that solve the problem of thermal instability, namely, electrooptical tuning (EOT) and piezooptical tuning (POT). Beam shaping, which prevents thermal gradients, will be treated in a separate paper. In this paper, the general physical theory is discussed both for EOT and POT. The equation for the phasematch condition is given. Interactive effects of temperature change ΔT, the applied electric field (E), and the stress field σ on a fixedposition crystal are treated. The general equations for EOT and POT are developed. Examples of the effect on SHG in cesium dideuterium arsenate (CD*A) are given. Using these techniques, with beam shaping to be described in a separate paper, 35 W of average output power at 0.53 μ has already been demonstrated.
 Publication:

Journal of Applied Physics
 Pub Date:
 January 1978
 DOI:
 10.1063/1.324347
 Bibcode:
 1978JAP....49..396H
 Keywords:

 Crystal Optics;
 ElectroOptics;
 Nonlinear Optics;
 Piezoelectric Crystals;
 Tuning;
 Crystal Lattices;
 Energy Conversion Efficiency;
 Harmonic Generations;
 Laser Outputs;
 Matrices (Mathematics);
 Stress Distribution;
 SolidState Physics;
 78.20.Hp;
 78.20.Jq;
 42.65.Cq;
 Piezo elasto and acoustooptical effects;
 photoacoustic effects;
 Electrooptical effects