Abstract
Optimization of laser output parameters vs. f-to-2f beating signals can be mutually contradicting, when an octave-spanning supercontinuum is employed for f-to-2f measurements. We show that resonant dispersive waves will solve this issue, thanks to their frequency stability against changes in laser power and chirping.
Highlights
The so-called f-to-2f method, which is used to measure carrier-envelope offset (CEO) frequency, is among the key techniques of optical frequency combs, which have had significant impact on high-precision optical frequency metrology, optical clocks, low-phase-noise microwave generation and many other fields[1,2,3,4]
We present experimental results showing that spectral envelopes of resonant dispersive wave (RDW) are comparably stable against changes in both laser power and chirping, which makes RDWs a good route for solving the abovementioned issue
These results clearly show that changing the laser power will change the spectral envelope and degrade the beating signal, because the peak-power frequency shifts with input power if the self-phase modulation (SPM)-induced segment of the supercontinuum is used, which is common in f-to-2f measurements
Summary
When there is a perturbation acting on a soliton (e.g., by a localized loss in the fibre or modified parameters in the laser cavity), a soliton will reshape its form and shed the excess energy into RDWs. It is this nature that makes RDWs stable against changes in pump laser power, chirping, or both. These results clearly show that changing the laser power will change the spectral envelope and degrade the beating signal, because the peak-power frequency shifts with input power if the SPM-induced segment of the supercontinuum is used, which is common in f-to-2f measurements. Given that no solitons can be formed when too much negative chirp is introduced, these results again reveal the relationships between RDWs and solitons
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