Directly modulated diode laser frequency doubled in a KTP waveguide as an excitation source for CO2 and O2 phase fluorometric sensors
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Open Access
- 1 January 1996
- journal article
- Published by SPIE-Intl Soc Optical Eng in Journal of Biomedical Optics
- Vol. 1 (1) , 124-131
Abstract
A directly modulated infrared diode laser was frequency doubled in an intracavity KTP quasi-phase matched waveguide, producing modulated laser light at 425 nm, which was subsequently employed for phase fluorometric detection of CO2 and O2 gases. The frequency-doubled source was coupled to a single optical fiber to deliver the excitation light to the sensor mounted at the fiber tip. Fluorescence from the sensor returned through the same fiber to a photodetector. This compact, low-power source provided continuously tunable modulation frequencies up to 200 MHz. In the detection of CO2 , the doubled infrared diode laser produced 425-nm light that was modulated to a depth of 27% at a modulation frequency of 95 MHz.Keywords
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