Pulsed hybrid dual wavelength Y-branch-DFB laser-tapered amplifier system  suitable for water vapor detection at 965 nm with 16 W peak power

Thi N. Vu; Andreas Klehr; Bernd Sumpf; Thomas Hoffmann; Armin Liero; Günther Tränkle

doi:10.1117/12.2208129

7 March 2016 Pulsed hybrid dual wavelength Y-branch-DFB laser-tapered amplifier system suitable for water vapor detection at 965 nm with 16 W peak power

Thi N. Vu, Andreas Klehr, Bernd Sumpf, Thomas Hoffmann, Armin Liero, Günther Tränkle

Author Affiliations +

Proceedings Volume 9767, Novel In-Plane Semiconductor Lasers XV; 97670R (2016) https://doi.org/10.1117/12.2208129
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

A master oscillator power amplifier system emitting alternatingly at two neighbored wavelengths around 965 nm is presented. As master oscillator (MO) a Y-branch DFB-laser is used. The two branches, which can be individually controlled, deliver the two wavelengths needed for a differential absorption measurement of water vapor. Adjusting the current through the DFB sections, the wavelength can be adjusted with respect to the targeted either “on” or “off” resonance, respectively wavelength λ_on or wavelength λ_off. The emission of this laser is amplified in a tapered amplifier (TA). The ridge waveguide section of the TA acts as optical gate to generate short pulses with duration of 8 ns at a repetition rate of 25 kHz, the flared section is used for further amplification to reach peak powers up to 16 W suitable for micro-LIDAR (Light Detection and Ranging). The necessary pulse current supply user a GaN-transistor based driver electronics placed close to the power amplifier (PA). The spectral properties of the emission of the MO are preserved by the PA. A spectral line width smaller than 10 pm and a side mode suppression ratio (SMSR) of 37 dB are measured. These values meet the demands for water vapor absorption measurements under atmospheric conditions.

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Thi N. Vu, Andreas Klehr, Bernd Sumpf, Thomas Hoffmann, Armin Liero, and Günther Tränkle "Pulsed hybrid dual wavelength Y-branch-DFB laser-tapered amplifier system suitable for water vapor detection at 965 nm with 16 W peak power", Proc. SPIE 9767, Novel In-Plane Semiconductor Lasers XV, 97670R (7 March 2016); https://doi.org/10.1117/12.2208129

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