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Optical microscope image of the device with an electron micrograph inset of the region in which the double channel waveguide has been separated into two cavities.
Lock-in amplified single-mode spectra showing SMSRs of 17 to 30 dB.
(a) Four single-mode spectra with different recorded at 310 K. (b) Normalized transmission of the long segment (continuous line) and the combined effective reflectivity of the air gap and the short segment (dot-dashed) calculated with a transfer matrix method.
Spectra of single mode laser emission with and without ammonia in the beam path, their difference and a theoretical absorption spectrum at ambient pressure taken from the HITRAN database.
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