AI Article Synopsis
- Researchers explored high-order sideband generation (HSG) to create frequency combs using a continuous-wave laser and quantum wells under electric fields.
- Frequency combs produced exhibited teeth at f = f + nf with n exceeding 120, yielding a comb span over 80 THz.
- The study confirmed that combs from similar f × F products had comparable spectral characteristics, highlighting HSG's potential for practical applications like frequency and linewidth measurement of THz sources.
Article Abstract
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 f was transmitted through an epitaxial layer containing GaAs/AlGaAs quantum wells that were driven by quasi-cw in-plane electric fields F between 4 and 50 kV/cm oscillating at frequencies f between 240 and 640 GHz. Frequency combs with teeth at f = f + nf (n even) were produced, with maximum reported n > 120, corresponding to a maximum comb span > 80 THz. Comb spectra with the identical product f × F 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.
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| http://dx.doi.org/10.1364/OE.26.029807 | DOI Listing |
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