Picosecond Gain Dynamics of an Actively Mode Locked External-Cavity Laser Diode

M. Hofmann; M. Koch; J. Feldmann; W. Elsäßer; E. O. Göbel; S. W. Koch; W. W. Chow

doi:10.1109/3.301639

Picosecond Gain Dynamics of an Actively Mode Locked External-Cavity Laser Diode

M. Hofmann, M. Koch, J. Feldmann, W. Elsäßer, E. O. Göbel, S. W. Koch, W. W. Chow

Optical Sciences, College of

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

We report a new experimental approach to study the temporal gain dynamics of an actively Mode Locked external-cavity laser diode. The experiment can be viewed as an electrical pump-optical probe technique. Picosecond time resolution is achieved by synchronizing the actively Mode Locked semiconductor laser to a Mode Locked Ti:Sapphire laser. The transmission of the Ti:Sapphire pulses through the active region of the laser diode is then measured as a function of photon energy and delay time. Our experiment allows to investigate the dynamics of the entire gain spectrum with picosecond time resolution since the Ti:Sapphire laser is wavelength tunable. On the basis of these data we are able to determine directly the wavelength dependence of the differential gain. The results compare well with microscopic calculations. The implication for the modelocking behavior of the diode laser is discussed.

Original language	English (US)
Pages (from-to)	1756-1762
Number of pages	7
Journal	IEEE Journal of Quantum Electronics
Volume	30
Issue number	8
DOIs	https://doi.org/10.1109/3.301639
State	Published - Aug 1994

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Picosecond Gain Dynamics of an Actively Mode Locked External-Cavity Laser Diode",

abstract = "We report a new experimental approach to study the temporal gain dynamics of an actively Mode Locked external-cavity laser diode. The experiment can be viewed as an electrical pump-optical probe technique. Picosecond time resolution is achieved by synchronizing the actively Mode Locked semiconductor laser to a Mode Locked Ti:Sapphire laser. The transmission of the Ti:Sapphire pulses through the active region of the laser diode is then measured as a function of photon energy and delay time. Our experiment allows to investigate the dynamics of the entire gain spectrum with picosecond time resolution since the Ti:Sapphire laser is wavelength tunable. On the basis of these data we are able to determine directly the wavelength dependence of the differential gain. The results compare well with microscopic calculations. The implication for the modelocking behavior of the diode laser is discussed.",

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AU - Göbel, E. O.

AU - Koch, S. W.

AU - Chow, W. W.

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