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Proceedings Paper

Phase correction in two-crystal optical parametric oscillators
Author(s): Darrell J. Armstrong; William J. Alford; Thomas D. Raymond; Arlee V. Smith
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Paper Abstract

The effect of the pump, signal, and idler wave phases on three-wave nonlinear parametric mixing is investigated in a series of single-pass- gain experiments. Measurements are made with two angle-tuned KTP crystals in a 532 nm pumped, walkoff-compensated, optical parametric amplifier that is seeded by an 800 nm cw diode laser. In one of the measurements the second crystal is orientated to have its effective nonlinearity deff. of opposite sign to that of the first crystal, so that all mixing that occurred in the first crystal is canceled by the second when the phase mismatch (Delta) kcrystal 1 equals (Delta) kcrystal 2 equals 0. Efficient two-crystal amplification is subsequently restored by selecting the correct phase relationship for the three waves entering the crystal by inserting a dispersive plate between the crystals. The experimental results are explained in a straightforward manner with diagrams involving the three input wave polarizations. These results demonstrate that walkoff-compensated geometries require phase correction to achieve efficient mixing in the second crystal whenever the nonlinear interaction involves two extraordinary waves (e-waves). One practical application of this work may be lower oscillation thresholds and enhanced performance in walkoff- compensated optical parametric oscillators which use two e-waves.

Paper Details

Date Published: 10 April 1995
PDF: 11 pages
Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995); doi: 10.1117/12.206456
Show Author Affiliations
Darrell J. Armstrong, Sandia National Labs. (United States)
William J. Alford, Sandia National Labs. (United States)
Thomas D. Raymond, Sandia National Labs. (United States)
Arlee V. Smith, Sandia National Labs. (United States)


Published in SPIE Proceedings Vol. 2379:
Solid State Lasers and Nonlinear Crystals
Gregory J. Quarles; Leon Esterowitz; Lap Kin Cheng, Editor(s)

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