Dresden 2003 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 3: Halbleiterlaser I

HL 3.11: Vortrag

Montag, 24. März 2003, 13:00–13:15, BEY/81

Intensity Noise Properties of Quantum Cascade Lasers — •Tobias Gensty and Wolfgang Elsäßer — Darmstadt University of Technology, Institute of Applied Physics, Schlossgartenstrasse 7, 64289 Darmstadt, Germany.

We investigate the intensity noise properties of intersubband quantum cascade lasers (QCLs). The investigated devices are Fabry Perot (FP) lasers [1] and distributed feedback (DFB) lasers emitting in the middle infrared spectral region around 5 µm wavelength. The intensity fluctuations are characterized by the so-called normalized relative intensity noise (RIN^∗) under pulsed conditions. FP and DFB lasers both show a decrease of RIN^∗ with increasing pump parameter R_p, although at different noise levels. In this contribution, we will discuss the dependency of RIN^∗ on R_p and compare the intensity noise properties of QCLs with these of interband edge emitting lasers and vertical-cavity surface-emitting lasers (VCSELs) [2], and lead-salt diode lasers [3].

[1] FP lasers have been kindly supplied by Fraunhofer Institute for Applied Solid-State Physics (IAF), Freiburg, Germany.

[2] D. M. Kuchta et al., Appl. Phys. Lett. 62, 1194 (1993).

[3] H. Fischer and M. Tacke, J. Opt. Soc. Am. B 8, 1824 (1991).