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Proceedings Paper

Characterization of laser diodes under short-pulsed conditions with high pulse energies
Author(s): Tobias Koenning; Evan Hale; David Irwin; Kim Alegria; Steve Patterson
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Paper Abstract

New applications require diode lasers to be driven with short pulses in the sub-micro second range. The goal is to minimize both the cost and size of the diode laser module by minimizing the number of laser bars required while maintaining the lifetime that is desired for the application. Products demanded by the market using such short pulses range from QCW stacks to fiber coupled modules. While many short pulsed applications use high fill factor bars, these bars are not suited for high brightness applications or coupling into small fiber cores. The focus of this work is the analysis of CW diode designs commonly used for high brightness fiber coupled modules under short pulsed conditions.

Three key parameters need to be known in order to design a diode laser module that is suited for high peak powers. First is the damage threshold of the facet. The damage threshold determines the maximum power level at which the laser can be operated safely, considering a proper safety margin dependent on application. The damage threshold is a function of the input pulse width and amplitude. The second parameter which is influenced by the drive current is the slow axis divergence of the diode laser. Knowledge of this parameter is critical when designing the system optics. The third parameter is the effective emitter size which may increase with operating current. An increase in emitter size will lead to larger divergences after collimating optics for a given focal length lens and may result in a larger spot when coupling into an optical fiber. All these parameters have to be considered when designing a new product.

Presented here is a study on these three critical parameters as a function of operating conditions. Results for different diode designs will be presented. The data presented includes damage thresholds, as well as near field and far field data at various operating currents. A design study for fiber coupled modules with high pulse energies based on the test results will be shown for various wavelengths.

Paper Details

Date Published: 26 February 2013
PDF: 8 pages
Proc. SPIE 8605, High-Power Diode Laser Technology and Applications XI, 860503 (26 February 2013); doi: 10.1117/12.2005059
Show Author Affiliations
Tobias Koenning, DILAS Diode Laser, Inc. (United States)
Evan Hale, DILAS Diode Laser, Inc. (United States)
David Irwin, DILAS Diode Laser, Inc. (United States)
Kim Alegria, DILAS Diode Laser, Inc. (United States)
Steve Patterson, DILAS Diode Laser, Inc. (United States)

Published in SPIE Proceedings Vol. 8605:
High-Power Diode Laser Technology and Applications XI
Mark S. Zediker, Editor(s)

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