Characterization of gain parameters in quantum-dot and quantum-well based VECSEL structures

M. Mangold; V. J. Wittwer; O. D. Sieber; M. Hoffmann; M. Golling; T. Südmeyer; U. Keller

doi:10.1117/12.905744

14 February 2012 Characterization of gain parameters in quantum-dot and quantum-well based VECSEL structures

M. Mangold, V. J. Wittwer, O. D. Sieber, M. Hoffmann, M. Golling, T. Südmeyer, U. Keller

Proceedings Volume 8242, Vertical External Cavity Surface Emitting Lasers (VECSELs) II; 82420X (2012) https://doi.org/10.1117/12.905744
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

We present gain characterization measurements for different VECSEL structures with quantum well (QW) and quantum dot (QD) layers in the active region. We use a high-precision reflectivity measurement setup to determine the change in reflectivity of the pumped gain chip with varying pulse fluences. In this way the gain saturation behavior and the smallsignal gain for several structures on different heat-spreaders were measured. The characterization was performed with femtosecond and picosecond pulses for varying pump powers and heat-sink temperatures. We measured a small-signal gain of up to 5% and saturation fluences in the range of 30-80 μJ/cm² for both QW and QD VECSELs. With an additional measurement setup we determined the gain spectra of two gain chips using a tunable cw probe beam. We measured gain bandwidths FWHM of 26 nm (QD-structure) and 30 nm (QW-structure).

Citation Download Citation

M. Mangold, V. J. Wittwer, O. D. Sieber, M. Hoffmann, M. Golling, T. Südmeyer, and U. Keller "Characterization of gain parameters in quantum-dot and quantum-well based VECSEL structures", Proc. SPIE 8242, Vertical External Cavity Surface Emitting Lasers (VECSELs) II, 82420X (14 February 2012); https://doi.org/10.1117/12.905744

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available