Optical frequency comb calibrated laser heterodyne radiometry in the near infrared

Connor Fredrick; Scott Diddams; Freja Olsen; Ryan Terrien; Frank Quinlan; Suvrath Mahadevan

doi:10.1117/12.2563020

13 December 2020 Optical frequency comb calibrated laser heterodyne radiometry in the near infrared

Connor Fredrick, Scott Diddams, Freja Olsen, Ryan Terrien, Frank Quinlan, Suvrath Mahadevan

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114473X (2020) https://doi.org/10.1117/12.2563020
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Using laser heterodyne radiometry with a resolution of 100 MHz we have observed a selection of iron lines in the solar spectrum near 1565 nm with an approximate resolving power of 2,000,000 million. With a laser frequency comb as the wavelength calibration source we have achieved absolute frequency instability on measurements of single lines at better than 13 MHz in a 10 second averaging window, and SNR of over 5000 when averaging up to a 1 hour exposure. An amplitude servo on the laser power creates a stable, repeatable background level, allowing for simple extraction of the line depth.

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Connor Fredrick, Scott Diddams, Freja Olsen, Ryan Terrien, Frank Quinlan, and Suvrath Mahadevan "Optical frequency comb calibrated laser heterodyne radiometry in the near infrared", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114473X (13 December 2020); https://doi.org/10.1117/12.2563020

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