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We report on the generation of frequency combs from the recently-discoveredphenomenon of high-order sideband generation (HSG). A near-band gapcontinuous-wave (cw) laser with frequency $f_\text{NIR}$ was transmittedthrough an epitaxial layer containing GaAs/AlGaAs quantum wells that weredriven by quasi-cw in-plane electric fields $F_\text{THz}$ between 4 and 50kV/cm oscillating at frequencies $f_\text{THz}$ between 240 and 640 GHz.Frequency combs with teeth at $f_\text{sideband}=f_\text{NIR}+nf_\text{THz}$($n$ even) were produced, with maximum reported $n>120$, corresponding to amaximum comb span $>80$ THz. Comb spectra with the identical product$f_\text{THz}\times F_\text{THz}$ were found to have similar spans and shapesin most cases, as expected from the picture of HSG as a scattering-limitedelectron-hole recollision phenomenon. The HSG combs were used to measure thefrequency and linewidth of our THz source as a demonstration of potentialapplications.

Optical Frequency Combs from High-Order Sideband Generation