Low noise erbium fiber fs frequency comb based on a tapered-fiber carbon nanotube design

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Abstract

We report on a low noise all-fiber erbium fs frequency comb based on a simple and robust tapered-fiber carbon nanotube (tf-CNT) design. We mitigate dominant noise sources to show that the free-running linewidth of the carrier-envelope offset frequency (fceo) can be comparable to the best reported performance to date for fiber-based frequency combs. A free-running fceo linewidth of ∼20 kHz is demonstrated, corresponding to an improvement of ∼30 times over previous work based on a CNT mode-locked fiber laser [Opt. Express 18, 1667(2010)]. We also demonstrate the use of an acousto-optic modulator external to the laser cavity to stabilize f ceo, enabling a 300 kHz feedback control bandwidth. The offset frequency is phase-locked with an in-loop integrated phase noise of ∼0.8 rad from 10Hz to 400kHz. We show a resolution-limited linewidth of ∼1 Hz, demonstrating over 90% of the carrier power within the coherent fceo signal. The results demonstrate that the relatively simple tf-CNT fiber laser design can provide a compact, robust and high-performance fs frequency comb.

Original languageEnglish (US)
Pages (from-to)5313-5318
Number of pages6
JournalOptics Express
Volume19
Issue number6
DOIs
StatePublished - Mar 14 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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