High-power sampled-grating-based master oscillator power amplifier system with 23.5 nm wavelength tuning around 970 nm

M. Tawfieq, H. Wenzel, P. Della Casa, O. Brox, A. Ginolas, P. Ressel, D. Feise, A. Knigge, M. Weyers, B. Sumpf, and G. Tränkle

Published in:

Appl. Opt., vol. 57, no. 29, pp. 8680-8685 (2018).

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Abstract:

Tunable high-power diode lasers are key components in various established and emerging applications. In this work, we present a compact hybrid master oscillator power amplifier (MOPA) laser system. The system utilizes a tunable GaAs-based sampled-grating (SG) distributed Bragg reflector (DBR) laser as the master oscillator (MO), which emits around a wavelength of 970 nm in a single longitudinal mode with a spectral width below 20 pm. The SG-DBR laser consists of two SGs, each of which can be thermally tuned with microheaters. By tuning one of the two SGs, a discrete wavelength tuning of 21.1 nm can be obtained with a Vernier mode spacing of about 2.3 nm. By tuning both SGs, 23.5 nm of quasi-continuous tuning is obtained, with a mode spacing of about 115 pm. The coupling of the beam emitted by the MO into a tapered power amplifier provides an amplified output power in the watt range having a nearly diffraction-limited beam with a propagation factor of M21/e2 = 1.6. The combination of high power and wide wavelength tuning in a compact system makes this light source ideal for, among other things, nonlinear frequency conversion.

Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

OCIS codes:

(140.3490) Lasers, distributed-feedback; (140.3600) Lasers, tunable; (250.5980) Semiconductor optical amplifiers; (130.3990) Micro-optical devices; (140.3613) Lasers, upconversion.