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White Papers

Current Developments in High Power, Monolithic, Polarization Maintaining Fiber Amplifiers for Coherent Beam Combining Applications

January 22, 2007

By: D.P. Machewirth, Q. Wang, B. Samson, K. Tankala, M. O'Connor, M. Alam

Presented at Photonics West 2007

Complete text not yet available for download. Please e-mail info@nufern.com

Monolithic, all-fiber PM optical amplifiers have been investigated regarding components performance, amplifier design and narrow line-width amplification. PM-based components performed very well, the pump/signal combiner in particular handling > 300W pump power and still maintaining the PER of the input signal. A co-pumped amplifier configuration was chosen based on reliability and potential SBS mitigation (i.e. fiber length after the active fiber output). This system based on PLMA-YDF-25/400 fiber appeared to give the best output power (155W-177W, depending on the length of passive delivery fiber), PER (~ 17 dB) and excellent beam quality (M²= 1.1). Altering the fiber temperature and length were necessary to provide the best results.