Diagram of setup (IMAGE)

Optica

Diagram of setup

Caption

To boost sensitivity, infrared light from the high-power ICLED travels through a 1-meter-long, hollow-core fiber containing an air sample. The inside of the fiber is coated with silver, which causes the light to reflect off its surfaces as it travels down the fiber to the photodetector (MCT for HgCdTe detector) at the other end. This allows the light to interact with additional molecules of methane in the air resulting in higher absorption of the light.

Credit

Nathan Li, Princeton University

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