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New Submount Requirement of Conductively Cooled Laser Diodes for Lidar ApplicationsNew submount technology is essential for the development of conductively cooled high power diode laser. The simulation and experimental results indicate that thermal conductivity of submount for high power laser-diode must be at least 600 W/m/k or higher for stable operation. We have simulated several theoretical thermal model based on new submount designs and characterized high power diode lasers to determine temperature effects on the performances of laser diodes. The characterization system measures the beam power, output beam profile, temperature distribution, and spectroscopic property of high power diode laser. The characterization system is composed of four main parts: an infrared imaging camera, a CCD camera, a monochromator, and a power meter. Thermal characteristics of two commercial-grade CW 20-W diode laser bars with open heat-sink type were determined with respect to the line shift of emission spectra and beam power stability. The center wavelength of laser emission has a tendency to shift toward longer wavelength as the driving current and heat sink temperature are increased. The increase of heat sink temperature decreases the output power of the laser bar too. Such results lay the guidelines for the design of new submount for high power laser-diodes.
Document ID
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Mo, S. Y.
(NASA Langley Research Center Hampton, VA United States)
Cutler, A. D.
(Washington Univ. Seattle, WA United States)
Choi, S. H.
(NASA Langley Research Center Hampton, VA United States)
Lee, M. H.
(Inha Univ. Inchon, Korea, Republic of)
Singh, U. N.
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 20, 2013
Publication Date
January 21, 2000
Publication Information
Publication: Lidar Remote Sensing for Industry and Environment Monitoring
Volume: 4153
Subject Category
Lasers And Masers
Distribution Limits

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