Narrowband alexandrite laser injection seeded with frequency-dithered diode laser

Geary K. Schwemmer; Hyo Sang Lee; Coorg R. Prasad

doi:10.1117/12.45834

1 September 1991 Narrowband alexandrite laser injection seeded with frequency-dithered diode laser

Geary K. Schwemmer, Hyo Sang Lee, Coorg R. Prasad

Proceedings Volume 1492, Earth and Atmospheric Remote Sensing; (1991) https://doi.org/10.1117/12.45834
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

Narrowband radiation is produced from a pulsed alexandrite laser when injection seeded with the output of a low-power, tunable, continuous-wave, single-mode diode laser. Injection seeded power oscillators are easier to frequency stabilize than etalong narrowed lasers, are more efficient, and less prone to optical damage. AlGaAs diode lasers are available with wavelengths from 760 to 770 nm in the oxygen A band that can be used for differential absorption lidar remote sensing of atmospheric pressure and temperature. Diodes with room temperature output at 740 nm may be cooled sufficiently to emit in the water vapor absorption band at 720-730 nm for humidity remote sensing. The diodes are driven with approximately 70 mA of current with a 0.5 mA peak to peak sinusoidal dither which imparts a 3 GHz frequency modulation to the output. A photoacoustic cell is utilized to generate a negative feedback signal to keep the diode frequency centered on the atmospheric absorption feature. The diode laser linewidth of 200 MHz is sufficient to seed 2 or 3 longitudinal modes of the multitransverse mode alexandrite laser, giving the pulsed laser a bandwidth of 0.007 to 0.014 cm-

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Geary K. Schwemmer, Hyo Sang Lee, and Coorg R. Prasad "Narrowband alexandrite laser injection seeded with frequency-dithered diode laser", Proc. SPIE 1492, Earth and Atmospheric Remote Sensing, (1 September 1991); https://doi.org/10.1117/12.45834

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