20 April 2010 Frequency stabilization of a 2.05 μm laser using hollow-core fiber CO2 frequency reference cell
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We have designed and built a hollow-core fiber frequency reference cell, filled it with CO2, and used it to demonstrate frequency stabilization of a 2.05 μm Tm:Ho:YLF laser using frequency modulation (FM) spectroscopy technique. The frequency reference cell is housed in a compact and robust hermetic package that contains a several meter long hollow-core photonic crystal fiber optically coupled to index-guiding fibers with a fusion splice on one end and a mechanical splice on the other end. The package has connectorized fiber pigtails and a valve used to evacuate, refill it, or adjust the gas pressure. We have demonstrated laser frequency standard deviation decreasing from >450MHz (free-running) to <2.4MHz (stabilized). The 2.05 μm laser wavelength is of particular interest for spectroscopic instruments due to the presence of many CO2 and H20 absorption lines in its vicinity. To our knowledge, this is the first reported demonstration of laser frequency stabilization at this wavelength using a hollow-core fiber reference cell. This approach enables all-fiber implementation of the optical portion of laser frequency stabilization system, thus making it dramatically more lightweight, compact, and robust than the traditional free-space version that utilizes glass or metal gas cells. It can also provide much longer interaction length of light with gas and does not require any alignment. The demonstrated frequency reference cell is particularly attractive for use in aircraft and space coherent lidar instruments for measuring atmospheric CO2 profile.
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Patrick Meras, Patrick Meras, Ilya Y. Poberezhskiy, Ilya Y. Poberezhskiy, Daniel H. Chang, Daniel H. Chang, Gary D. Spiers, Gary D. Spiers, } "Frequency stabilization of a 2.05 μm laser using hollow-core fiber CO2 frequency reference cell", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 767713 (20 April 2010); doi: 10.1117/12.852665; https://doi.org/10.1117/12.852665

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