OPO performance with an aberrated input pump beam

William A. Neuman

doi:10.1117/12.239656

10 May 1996 OPO performance with an aberrated input pump beam

William A. Neuman

Proceedings Volume 2700, Nonlinear Frequency Generation and Conversion; (1996) https://doi.org/10.1117/12.239656
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

The performance of an optical parametric oscillator (OPO) with non-ideal input pump fields is investigated numerically. The analysis consists of a beam propagation calculation based on Fourier methods including walk-off in the non-linear crystal coupled with the three-wave interaction in the crystal. The code is time dependent enabling analysis of laser pulses. The pump beam aberrations are described by Zernike polynomials. The OPO investigated is a LiNbO₃ crystal in a flat-flat resonator. The LiNbO₃ crystal is cut to produce a 1.5 micrometers signal and 3.6 micrometers idler from a 1.06 micrometers input pump field. The results show that the type of aberration is significant when predicting the output performance of the OPO and not simply the beam quality or M² angular divergence of the pump beam. While thresholds for input pump beams with M² equals 2 only increase on the order of 10% over unaberrated beams, the divergence of the output fields can be much worse than the pump beam divergence. The output beam divergence is also a function of the input pump energy. Aberrated pump fields can also lead to angular displacements between the generated signal and idler fields.

Citation Download Citation

William A. Neuman "OPO performance with an aberrated input pump beam", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); https://doi.org/10.1117/12.239656

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