NDLI: Increasing the luminance of a red emitting laser light source by spectral beam combining

Content Provider	IEEE Xplore Digital Library
Author	Blume, G. Feise, D. Sahm, A. Eppich, B. Paschke, K.
Copyright Year	2013
Description	Author affiliation: Ferdinand-Braun-Inst., Leibniz-Inst. fur Hochstfrequenztechnik, Berlin, Germany (Blume, G.; Feise, D.; Sahm, A.; Eppich, B.; Paschke, K.)
Abstract	Summary form only given. Current diode laser based projections systems suffer from low output power and hence poor visibility, especially of the red laser sources. An additional constraint for flying-spot projection is that the light source should feature an almost diffraction limited beam and a low speckle contrast. This can be achieved with tapered lasers (TPL) [1], but the output power is limited to about 1 W. One possible way to further increase the luminance is spectral beam combining of multiple emitters. We developed high power TPL with internal distributed-Bragg-reflector (DBR) gratings in the red spectral range near 635 nm [2]. The variable period length (Λ1 - Λ10) of the DBR allowed the processing of a bar of ten diode lasers with increasing, successive wavelengths (λ1 - λ10). Figure 1 shows on the left the light-current-voltage characteristics of such a DBR-TPL-BAR as a function of temperature. The right side shows the spectrum at about 1.6 W (I = 12 A, T = -20°C) showing the emission of all ten individual lasers. The cooling was required due to the combination of the low T0 value of about 30 K and the mutual heating of the laser chips on the bar.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	151980
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6800738
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power lasers Surface emitting lasers Diode lasers Laser beams Distributed Bragg reflectors Power generation
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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