Abstract
While whispering gallery mode resonators are well known for their low acceleration sensitivity, there has not been much published experimental research on the subject. We performed environmental sensitivity tests of a 2μm semiconductor distributed feedback (DFB) laser, self-injection locked to a high-Q crystalline whispering gallery mode resonator. Measured acceleration sensitivity of the laser is below 5×10-11 g-1 in the 1-200Hz frequency bandwidth and thermal sensitivity does not exceed 12 MHz/°C. The laser's frequency noise is below 50 Hz/Hz1/2 at 10Hz, reaching 0.4 Hz/Hz1/2 at 400kHz. The instantaneous linewidth of the laser is improved by nearly 4 orders of magnitude compared to the free-running DFB laser and is measured to be 50Hz at 0.1ms measurement time. The Allan deviation of the laser frequency is on the order of 10-9 from 1 to 1000s. All these features make the laser attractive for metrology applications involving low-noise 2μm seed lasers.
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