Experimental demonstration of Kerr optical frequency comb generation in a tellurite microsphere

We experimentally demonstrate optical frequency comb gen-eration in a tellurite microsphere, for the first time to the best of our knowledge, for tellurite glass microresonators. The TeO2-WO3-La2O3-Bi2O3 (TWLB) glass microsphere has a maximum Q-factor of 3.7 x 107, which is the high-est ever reported for tellurite microresonators. We obtain a frequency comb containing seven spectral lines in the nor-mal dispersion range when pumping the microsphere with a diameter of 61 mu m at a wavelength of 1.54 mu m. (c) 2023 Optica Publishing Group https://doi.org/10.1364/OL.484547

Automated summary

We demonstrate the generation of optical frequency comb in a tellurite microsphere, which is the first time for tellurite glass microresonators. The TeO2-WO3-La2O3-Bi2O3 (TWLB) glass microsphere has a record-breaking Q-factor of 3.7 x 107 among tellurite microresonators. By pumping the microsphere with a diameter of 61 μm at a wavelength of 1.54 μm, we obtain a frequency comb with seven spectral lines in the normal dispersion range.