Fiber coupled acousto-optic modulators for near UV and blue wavelength applications

Swain, M., Farries, M., Christie, M., Reid, T., Ward, J., Ballance, C., Kolthammer, W., Gow, P.C. and O'Brien, D. (2018) Fiber coupled acousto-optic modulators for near UV and blue wavelength applications. In Advances in Photonics of Quantum Computing, Memory, and Communication XI. vol. 10547, SPIE.. (doi:10.1117/12.2287718).

Abstract

We present results from the development of a fiber-coupled Acousto-Optic modulator (Fiber-Q®) operating at near-UV and blue wavelengths. A conventional TeO₂ based Bragg diffraction design is introduced for short wavelengths optical input. Pure silica core single mode fibers (both Polarisation Maintaining (PM) and non-PM) are used as coupling fibers for their transmission at these wavelengths, and to avoid the possibility of photo darkening. The end of the fibers are fused with silica end-caps, lowering the power density on their fiber-air interfaces to achieve a higher power handling. The Fiber-Q® can be optimized for multiple wavelengths (including 397nm or 422nm) and can accept power levels of up to 100mW. A hermetically sealed package is selected to provide a clean in-package environment thus protecting the optics from damage caused by external contamination. In this presentation we report details of the design, and test results of a fiber-coupled Acousto-Optic modulator that demonstrates the performance required for use in ion-trap quantum information processing applications.

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Contributors

Author: P.C. Gow

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