Investigation of distributed Bragg reflectors tapered-ridge-waveguide lasers under nanosecond high pulse current excitation

H. Christopher; M. Beier; J. Fricke; J. Glaab; A. Liero; A. Maaßdorf; J.-P. Koester; H. Wenzel; A. Knigge

doi:10.1117/12.2649600

15 March 2023 Investigation of distributed Bragg reflectors tapered-ridge-waveguide lasers under nanosecond high pulse current excitation

H. Christopher, M. Beier, J. Fricke, J. Glaab, A. Liero, A. Maaßdorf, J.-P. Koester, H. Wenzel, A. Knigge

Author Affiliations +

Proceedings Volume 12440, Novel In-Plane Semiconductor Lasers XXII; 124400I (2023) https://doi.org/10.1117/12.2649600
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Diode lasers providing nanosecond high power optical pulses are key components for light detection and ranging (LiDAR) systems used for, e.g., distance measurements. For autonomous vehicles, good beam quality is an important aspect to achieve the required high spatial resolution. While 30 μm broad area devices can achieve pulse powers >20 W emitting at 905 nm, the beam quality factor M2 is about ten and further degrades with increasing stripe width. Tapered-Ridge-Waveguide (TRW) lasers with 23 μm wide output apertures reduced the M² to about 2.2 without power loss. However, deployment of such lasers also requires a low temperature-dependent wavelength shift allowing for narrowband spectral filters. Here, we present TRW Distributed Bragg Reflector (DBR) lasers with a 23 μm wide output aperture. For emission around 905 nm the active region comprises an InGaAs single quantum well embedded in an AlGaAs waveguide. A surface Bragg grating is implemented into an unpumped section of the device enabling a wavelength shift of only 0.07 nm/K. The electrical interface realized by a nanosecond pulse driver developed in-house delivers pulse currents up to some 10 A within 2 ns to 5 ns pulses at 10 kHz. We investigate different designs of the trenches etched to define the ridge-waveguide. Beam quality factors of about three are achieved at pulse powers of about 10 W. Experimental results on the optical power, the near and far field profiles, and spectral characteristics are presented. Integration into an electrical driver module allows for reliability tests on an application relevant testbed.

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H. Christopher, M. Beier, J. Fricke, J. Glaab, A. Liero, A. Maaßdorf, J.-P. Koester, H. Wenzel, and A. Knigge "Investigation of distributed Bragg reflectors tapered-ridge-waveguide lasers under nanosecond high pulse current excitation", Proc. SPIE 12440, Novel In-Plane Semiconductor Lasers XXII, 124400I (15 March 2023); https://doi.org/10.1117/12.2649600

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