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Cascaded half-harmonic generation of femtosecond frequency combs in mid-IR

Marandi, Alireza and Ingold, Kirk A. and Jankowski, Marc and Byerc, Robert L. (2015) Cascaded half-harmonic generation of femtosecond frequency combs in mid-IR. . (Unpublished)

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For the growing demand of frequency combs in mid-infrared (mid-IR), known as the "molecular fingerprint" region of the spectrum [1], down conversion of near-IR frequency combs through half- harmonic generation offers numerous benefits including high conversion efficiency and intrinsic phase and frequency locking to the near-IR pump [2]. Hence cascaded half-harmonic generation promises a simple path towards extending the wavelength coverage of stable frequency combs. Here, we report a two-octave down-conversion of a frequency comb around 1 µm through cascaded half-harmonic generation with ~64% efficiency in the first stage, and ~18% in the second stage. We obtain broadband intrinsically-frequency-locked frequency combs with ~50-fs pulses at ~2 µm and ~110-fs pulses at ~4 µm. These results indicate the effectiveness of half-harmonic generation as a universal tool for efficient phase- and frequency-locked down-conversion, which can be beneficial for numerous applications requiring long-wavelength coherent sources.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Marandi, Alireza0000-0002-0470-0050
Jankowski, Marc0000-0003-1845-7415
Additional Information:The authors thank M.M. Fejer, for discussions, and R. McCracken, C. Langrock, and K. Urbanek for experimental support.
Record Number:CaltechAUTHORS:20200124-153504192
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100916
Deposited By: Tony Diaz
Deposited On:25 Jan 2020 03:39
Last Modified:25 Jan 2020 03:39

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