T.N. Vu^1,2 , A. Klehr¹, B. Sumpf¹, H. Wenzel¹, G. Erbert¹, and G. Tränkle¹

Published in:

Opt. Lett., vol. 39, no. 17, pp. 5138-5141 (2014).

Abstract:

A spectrally tunable, narrow linewidth master oscillator power amplifier system emitting ns pulses with high peak power is presented. The master oscillator is a distributed feedback ridge waveguide (DFB-RW) laser, which is operated in continuous wave (CW) mode and emits at about 975 nm with a spectral line width below 10 pm. The oscillator can be tuned over a range of 0.9 nm by varying the injection current. The tapered amplifier (TA) consists of an RW section and a flared gain-guided section. The RW section of the amplifier acts as an optical gate and converts the CW input beam emitted by the DFB-RW laser into a train of short optical pulses, which are subsequently amplified by the tapered section. The width of the pulses is 8 ns at a repetition rate of 25 kHz. The peak power is 16.3 W. The TA preserves the spectral properties of the emission of the DBR-RW laser. The amplified spontaneous emission is suppressed by about 40 dB.

OCIS codes:

(140.3280) Laser amplifiers; (140.3490) Lasers, distributed-feedback; (140.3600) Lasers, tunable; (140.5960) Semiconductor lasers; (140.3538) Lasers, pulsed.

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