Reflectors and tuning elements for widely-tunable GaAs-based sampled grating DBR lasers

O. Brox; H. Wenzel; P. Della Case; M. Tawfieq; B. Sumpf; M. Weyers; A. Knigge

doi:10.1117/12.2287413

19 February 2018 Reflectors and tuning elements for widely-tunable GaAs-based sampled grating DBR lasers

O. Brox, H. Wenzel, P. Della Case, M. Tawfieq, B. Sumpf, M. Weyers, A. Knigge

Proceedings Volume 10553, Novel In-Plane Semiconductor Lasers XVII; 1055310 (2018) https://doi.org/10.1117/12.2287413
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Widely-tunable lasers without moving parts are attractive light sources for sensors in industry and biomedicine. In contrast to InP based sampled grating (SG) distributed Bragg reflector (DBR) diode lasers which are commercially available, shorter wavelength GaAs SG-DBR lasers are still under development. One reason is the difficulty to integrate gratings with coupling coefficients that are high enough for functional grating bursts with lengths below 10 μm. Recently we have demonstrated > 20 nm wide quasi-continuous tuning with a GaAs based SG-DBR laser emitting around 975 nm. Wavelength selective reflectors are realized with SGs having different burst periods for the front and back mirrors. Thermal tuning elements (resistors) which are placed on top of the SG allow the control of the spectral positions of the SG reflector combs and hence to adjust the Vernier mode. In this work we characterize subsections of the developed SG-DBR laser to further improve its performance. We study the impact of two different vertical structures (with vertical far field FWHMs of 41° and 24°) and two grating orders on the coupling coefficient. Gratings with coupling coefficients above 350 cm^-1 have been integrated into SG-DBR lasers. We also examine electronic tuning elements (a technique which is typically applied in InP based SG-DBR lasers and allows tuning within nanoseconds) and discuss the limitations in the GaAs material system

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O. Brox, H. Wenzel, P. Della Case, M. Tawfieq, B. Sumpf, M. Weyers, and A. Knigge "Reflectors and tuning elements for widely-tunable GaAs-based sampled grating DBR lasers", Proc. SPIE 10553, Novel In-Plane Semiconductor Lasers XVII, 1055310 (19 February 2018); https://doi.org/10.1117/12.2287413

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KEYWORDS

Neodymium

Gallium arsenide

Quantum wells

Reflectors

Seaborgium

Wavelength tuning

Oxygen

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