Holographic phasing of fiber lasers: simple, scalable, broadband locking

G. Andersen; K. MacDonald; P. Gelsinger-Austin

doi:10.1117/12.2050601

9 June 2014 Holographic phasing of fiber lasers: simple, scalable, broadband locking

G. Andersen, K. MacDonald, P. Gelsinger-Austin

Proceedings Volume 9081, Laser Technology for Defense and Security X; 90810Q (2014) https://doi.org/10.1117/12.2050601
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

We present a new method to lock an unlimited number of lasers using a simple, inexpensive hologram and photodiodes. Multiple fiber laser inputs are sent through a fiber shifters and then onto two holographic optical elements that split each beam in two and mix them in pairs. By taking the ratio of intensities measured from photodiodes, an error signal is generated which can be used to control the phase shifters to ensure continuous phase locking of pairs of lasers. We have constructed an autonomous system that locks 3 lasers and occupies a footprint no larger than a laptop. Locking is robust and can be configured to work with lasers of any power and wavelength. Our current system operates at bandwidths of up to 10kHz but has the potential of 100MHz or faster using a two-stage, woofer-tweeter approach.

Citation Download Citation

G. Andersen, K. MacDonald, and P. Gelsinger-Austin "Holographic phasing of fiber lasers: simple, scalable, broadband locking", Proc. SPIE 9081, Laser Technology for Defense and Security X, 90810Q (9 June 2014); https://doi.org/10.1117/12.2050601

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