title: Tunable 975 nm nanosecond diode-laser-based master-oscillator power-amplifier system with 16.3 W peak power and narrow spectral linewidth below 10 pm.
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.
authors.forename: Thi Nghiem
authors.initials: TN
authors.lastname: Vu
authors.forename: Andreas
authors.initials: A
authors.lastname: Klehr
authors.forename: Bernd
authors.initials: B
authors.lastname: Sumpf
authors.forename: Hans
authors.initials: H
authors.lastname: Wenzel
authors.forename: Götz
authors.initials: G
authors.lastname: Erbert
authors.forename: Günther
authors.initials: G
authors.lastname: Tränkle