Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.78: Poster
Monday, March 12, 2018, 17:30–19:30, Poster B
Experimental investigations on the gain and dispersion properties of mode-locked semiconductor lasers — •Stefan Heppe1, Christoph Weber1, Paolo Bardella2, Lorenzo Luigi Columbo2, Mariangela Gioannini2, and Stefan Breuer1 — 1Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany — 2Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Optical frequency combs generated by monolithic mode-locked (ML) semiconductor lasers (SCLs) in the near-infrared wavelength region are ideal sources in time critical applications such as optical communication. Since the phase difference between adjacent modes is fixed over time, ultra-short optical pulses can be emitted but due to group delay dispersion (GDD) inside the laser cavity the pulses are in most cases not Fourier-limited and it is even possible to have ML operation without any pulses in the laser output [Bardella et al, Opt. Expr. 25 (2017), 26234]. To obtain ultra-short pulses, a precise knowledge of the GDD and the gain properties of the laser material is necessary. In this work, we use a method employing a Fourier-transform spectrometer [Hofstetter, Faist, IEEE Phot. Techn. Letts. 11 (1999), 1372; Villares et al, Optica 3 (2016), 152] to measure the wavelength dependent gain and GDD in ML SCLs with different active materials and emission wavelengths.