Abstract

We demonstrate a wavelength-locked laser source that rapidly steps through six wavelengths distributed across a 1572.335nm carbon dioxide (CO2) absorption line to allow precise measurements of atmospheric CO2 absorption. A distributed-feedback laser diode (DFB-LD) was frequency-locked to the CO2 line center by using a frequency modulation technique, limiting its peak-to-peak frequency drift to 0.3MHz at 0.8s averaging time over 72 hours. Four online DFB-LDs were then offset locked to this laser using phase-locked loops, retaining virtually the same absolute frequency stability. These online and two offline DFB-LDs were subsequently amplitude switched and combined. This produced a precise wavelength-stepped laser pulse train, to be amplified for CO2 measurements.

© 2011 Optical Society of America

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