Optical Frequency Combs from High-Order Sideband Generation
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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We report on the generation of frequency combs from the recently-discovered phenomenon of high-order sideband generation HSG. A near-band gap continuous-wave cw laser with frequency fNIR was transmitted through an epitaxial layer containing GaAsAlGaAs quantum wells that were driven by quasi-cw in-plane electric fields F-THz between 4 and 50 kVcm oscillating at frequencies fTHz between 240 and 640 GHz. Frequency combs with teeth at fsideband fNIR n fTHz n even were produced, with maximum reported n 120, corresponding to a maximum comb span 80 THz. Comb spectra with the identical product fTHz x F-THz were found to have similar spans and shapes in most cases, as expected from the picture of HSG as a scattering-limited electron-hole recollision phenomenon. The HSG combs were used to measure the frequency and linewidth of our THz source as a demonstration of potential applications.
- Lasers and Masers