Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 81: Semiconductor lasers II
HL 81.5: Talk
Friday, March 20, 2020, 11:00–11:15, POT 81
Wave front analysis of monolithic passively mode locked semiconductor quantum well lasers — •Clemens Adler1, Christoph Weber2, Inga-Maria Eichentopf1, Andreas Klehr3, Andrea Knigge3, Stefan Breuer2, and Martin Reufer1 — 1Hochschule Ruhr West, Institute of Natural Sciences, Duisburger Str. 100, 45479 Mülheim an der Ruhr — 2Institute of Applied Physics, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany — 3Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
Mode-locked semiconductor diode lasers are well established photon sources. Their temperature and charge carrier distributions within the active layer depends on the injection conditions and are expected to change with the process of mode locking. Higher optical modes are supported by the resonator potentially impacting the modal composition and emitted laser beam properties. We experimentally study the bias dependent modal composition of a passively mode-locked quantum well laser emitting at 1070 nm [1]. A Shack-Hartmann sensor detects the local gradients of the Poynting vector of the laser beam. Deviations in the wave front are identified by decomposition into Zernike polynomials [2]. Our near and far field measurement results suggest a dependence of the wave front properties on the laser operation mode.
[1] Weber et al, IEEE J. Quantum Electron. 54 (3), 2000609 (2018)
[2] Schäfer et al, Applied Optics 41, 2809 (2002)