Abstract
A phase-locked, self-referenced frequency comb generated by a mode-locked fiber soliton laser with a tunable repetition rate is presented. The spacing of the frequency comb is set by the laser's repetition rate, which can be scanned from 49.3 MHz to 50.1 MHz while one tooth of the comb is held phase-locked to a stable RF source. This variable repetitionrate frequency comb should be useful for wavelength and length metrology, synchronization of different fiber laser-based frequency combs, and the generation of precise swept wavelength sources.
Highlights
Phase-locked self-referenced fiber-laser-based frequency comb sources have been developed for precision infrared frequency metrology using a figure-eight fiber laser [1], a pulsecompression mode-locked fiber laser [2], and several different designs of fiber ring lasers [35]
The basic designs of the fiber-laser frequency combs duplicate that used for Ti:Sapphire laser-based frequency combs [6, 7]; an octave-spanning supercontinuum [8] is generated and used to detect the carrier envelope offset (CEO) frequency [9, 10]
By injecting amplified pulses from the soliton laser into highly nonlinear fiber, we can generate the octave of supercontinuum bandwidth needed to selfreference the frequency comb using the standard f-to-2f interferometer [6]
Summary
Phase-locked self-referenced fiber-laser-based frequency comb sources have been developed for precision infrared frequency metrology using a figure-eight fiber laser [1], a pulsecompression mode-locked fiber laser [2], and several different designs of fiber ring lasers [35]. The basic designs of the fiber-laser frequency combs duplicate that used for Ti:Sapphire laser-based frequency combs [6, 7]; an octave-spanning supercontinuum [8] is generated and used to detect the carrier envelope offset (CEO) frequency [9, 10]. F0 ~ 2.5 THz. in metrology experiments using a self-referenced comb, the offset frequency is typically defined modulo fr to a range -fr/2 < f0 < +fr/2, so that it represents the frequency of the lowest comb line if the optical comb were to be extended to zero frequency. A frequency comb with a tunable repetition rate can be used to scan precisely the frequency of a continuous wave laser locked to the comb
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
