Generation of Kerr combs centered at 4.5μm in crystalline microresonators pumped by quantum cascade lasers

Abstract

We report on the generation of mid-infrared Kerr frequency combs in high-finesse CaF${}_2$ and MgF${}_2$ whispering-gallery mode resonators pumped with continuous wave room temperature quantum cascade lasers. The combs were centered at 4.5$\mu$m, the longest wavelength to date. A frequency comb wider than a half of an octave was demonstrated when approximately 20mW of pump power was coupled to an MgF2 resonator characterized with quality factor exceeding 10${}^8$.

5 pages, 5 figures

References in corpus (2)

• Silicon-Chip Mid-Infrared Frequency Comb Generation
• Optical combs with a crystalline whispering gallery mode resonator

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