A low repetition rate optical frequency comb

Abstract

Reducing the pulse repetition rate of an optical frequency comb increases the pulse energy for a given average power. This enhances the efficiency of nonlinear frequency conversion and it facilitates extending the accessible wavelength range, for example into the extreme ultraviolet (XUV). The resulting spectrally dense frequency comb can still be used for precision spectroscopy of narrow atomic or molecular transitions. In this article, we demonstrate a low-noise infrared frequency comb with a repetition rate as low as 40 kHz using a Yb:KYW mode-locked laser, pulse picking, and subsequent amplification. The frequency comb structure is confirmed by generating a beat note with a continuous wave reference laser. A comb mode is actively stabilized to the reference laser, and the integrated rms phase noise from 20 Hz to 20 kHz is measured to be 195 mrad.

References in corpus (18)

• Mid-infrared frequency combs
• Frequency comb spectroscopy
• An Optical Lattice Clock with Accuracy and Stability at the $10^{-18}$ Level
• Coherent, multi-heterodyne spectroscopy using stabilized optical frequency combs
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Direct Frequency Comb Spectroscopy in the Extreme Ultraviolet
• A laser frequency comb that enables radial velocity measurements with a precision of 1 cm s${}^{-1}$
• Ultra-stable optical clock with two cold-atom ensembles
• Cavity Enhanced Optical Vernier Spectroscopy, Broad Band, High Resolution, High Sensitivity
• Proton-Electron Mass Ratio from Laser Spectroscopy of HD${}^{+}$ at the Part-Per-Trillion Level
• Observation of the radiative decay of the ${}^{229}\mathrm{Th}$ nuclear clock isomer
• Extreme Nonlinear Optics in a Femtosecond Enhancement Cavity
• Efficient single-cycle pulse compression of an ytterbium fiber laser at 10 MHz repetition rate
• Concepts for direct frequency-comb spectroscopy of ${}^{229\text{m}}$Th and an internal-conversion-based solid-state nuclear clock
• Tunable VUV Frequency Comb for ${}^{229m}$Th Nuclear Spectroscopy
• High-Precision Ramsey-Comb Spectroscopy Based on High-Harmonic Generation
• Simple phase noise measurement scheme for cavity-stabilized laser systems
• All-solid-state VUV frequency comb at 160 nm using multi-harmonic generation in a non-linear femtosecond enhancement cavity