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The unique characteristics of such WGM devices appear to be particularly relevant for mid-infrared (MIR) applications, because of the stronger molecular absorption lines in the MIR, and because of the increasing need for frequency comb sources in this “molecular fingerprint” region.We propose and demonstrate a simple and reliable method for fabricating high quality whispering-gallery mode (WGM) optical microresonators in “mid-IR relevant” low-loss ZBLAN glasses. Intrinsic quality factors of 107 have been demonstrated, providing great promise for WGM-based mid-IR devices. Absorption-limited Q-factors of over 3x108 are anticipated over the 2.0 to 3.2 micron MIR wavelength range in ZBLAN microcavities in the foreseeable future.
- Fluoride glass mid-IR microsphere microresonators (ZBLAN, InF3, AlF3)
-B. Way, R. K. Jain, and M. Hossein-Zadeh, "High-Q
Microresonators for Mid-IR Light Sources and Molecular Sensors", Optics
Letters, vol. 37, no. 21, pp. 4389-4391, 2012.
- Mid-IR microlaser based on WGMs in Er:ZBLAN microsphere
-Y. Deng, R. K. Jain, and M. Hossein-Zadeh, "Demonstration of a cw room temperature mid-IR microlaser", Optics Letters, vol. 39, no.15, pp. 4458-4461, Aug. 2014.