Open AccessCarrier-envelope offset locking with a 2f-to-3f self-referencing interferometer using a dual-pitch PPLN ridge waveguide
Author(s) -
Kenichi Hitachi,
Atsushi Ishizawa,
Tadashi Nishikawa,
Masaki Asobe,
Tetsuomi Sogawa
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.001629
Subject(s) - optics , lithium niobate , supercontinuum , interferometry , materials science , bandwidth (computing) , physics , optical fiber , photonic crystal fiber , telecommunications , computer science
We demonstrate that a 2f-to-3f self-referencing interferometer (SRI) becomes a useful tool for stabilizing a carrier-envelope offset frequency of an Er-doped fiber laser. A dual-pitch periodically poled lithium niobate (PPLN) ridge waveguide, consisting of two monolithically integrated segments with different quasi-phase matching pitch sizes, allows us to generate third-harmonic light with high efficiency. By using this device, we obtain a 45-dB signal-to-noise ratio in 100-kHz bandwidth of a heterodyne beat signal and instability of the in-loop f CEO of 8 × 10(-18) at 1 s of averaging time. This result is important for f CEO stabilization of a frequency comb, for which it is difficult to obtain a one-octave supercontinuum spectrum.