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Alternate intensity modulation of a dual-wavelength He−Ne laser for differential absorption measurements (1985)

Uehara, K.

Springer

Applied physics 38 (1985), S. 37-40

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ISSN: 1432-0649

Keywords: 42.60.F

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract A simple method is demonstrated for internal intensity modulation of the 3.391 and 3.392-μm emissions of a He−Ne laser with equal amplitudes and 180° out of phase to each other. A modulation amplitude of 0.7 mW peak-to-peak at 1kHz for the individual emissions has been obtained from a laser plasma tube 50 cm long while maintaining the total-intensity modulation as low as 0.25 μW for a signal averaging time of 1 s. This laser source can greatly simplify the setup and improve the sensitivity of differential absorption measurements for the methane remote sensing.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00691768

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