Fundamental Beam Quality Considerations For Modes Of Adjoint-Coupled Lasers

D. L. Bullock; J. S. Yun

doi:10.1117/12.951319

31 May 1989 Fundamental Beam Quality Considerations For Modes Of Adjoint-Coupled Lasers

D. L. Bullock, J. S. Yun

Proceedings Volume 1045, Modeling and Simulation of Laser Systems; (1989) https://doi.org/10.1117/12.951319
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Passive resonator modes of aligned and unaberrated adjoint-coupled resonators have been calculated using full 3D wave optics. They are observed to have unexpected properties which degrade the associated beam quality. The principle of adjoint coupling is based upon injecting a coupling wave "backward", i.e., in the adjoint direction, into a given resonator element. This adjoint coupling wave is expected to undergo a number of round trip passes internal to the resonator element, compressing via demagnification to the Fresnel core of the resonator element, and emerging via diffraction fully aligned with the optical axis of the resonator element. This study has found that the modes of such an adjoint-coupled system do not show the expected behavior for the coupling wave components of the mode. Components do not fully compress to the Fresnel core, but emerge prematurely and misaligned relative to the optical axis. This results in a Strehl ratio and beam quality degradation for the associated element factor of the coupled system far field pattern. A simple gaussian beam analog calculation of the coupling wave behavior supports this conclusion and allows detailed analyses of the features of the far field of the coupled resonator element.

Citation Download Citation

D. L. Bullock and J. S. Yun "Fundamental Beam Quality Considerations For Modes Of Adjoint-Coupled Lasers", Proc. SPIE 1045, Modeling and Simulation of Laser Systems, (31 May 1989); https://doi.org/10.1117/12.951319

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