Abstract

A passively phase-locked laser source based on compact femtosecond Er:fiber technology is introduced. The carrier-envelope offset frequency is set to zero via difference frequency generation between a soliton at a wavelength of 2μm and a dispersive wave at 860nm generated in the same highly nonlinear fiber. This process results in a broadband output centered at 1.55μm. Subsequently, the 40MHz pulse train seeds a second Er:fiber amplifier, which boosts the pulse energy up to 8nJ at a duration of 125fs. Excellent phase stability is demonstrated via f-to-2f spectral interferometry.

© 2011 Optical Society of America

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