High-power laser diodes with high polarization purity

Etai Rosenkrantz, Dan Yanson, Ophir Peleg, Moshe Blonder, Noam Rappaport, Genady Klumel

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Fiber-coupled laser diode modules employ power scaling of single emitters for fiber laser pumping. To this end, techniques such as geometrical, spectral and polarization beam combining (PBC) are used. For PBC, linear polarization with high degree of purity is important, as any non-perfectly polarized light leads to losses and heating. Furthermore, PBC is typically performed in a collimated portion of the beams, which also cancels the angular dependence of the PBC element, e.g., beam-splitter. However, we discovered that single emitters have variable degrees of polarization, which depends both on the operating current and far-field divergence. We present data to show angle-resolved polarization measurements that correlate with the ignition of high-order modes in the slow-axis emission of the emitter. We demonstrate that the ultimate laser brightness includes not only the standard parameters such as power, emitting area and beam divergence, but also the degree of polarization (DoP), which is a strong function of the latter. Improved slow-axis divergence, therefore, contributes not only to high brightness but also high beam combining efficiency through polarization.

Original languageEnglish
Title of host publicationHigh-Power Diode Laser Technology XV 2017
EditorsMark S. Zediker
PublisherSPIE
ISBN (Electronic)9781510606135
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes
EventHigh-Power Diode Laser Technology XV 2017 - San Francisco, United States
Duration: 30 Jan 201731 Jan 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10086
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceHigh-Power Diode Laser Technology XV 2017
Country/TerritoryUnited States
CitySan Francisco
Period30/01/1731/01/17

Keywords

  • Degree of polarization
  • brightness
  • fiber coupled emitter
  • fiber coupling
  • high-power laser
  • laser diode
  • multi-emitter module
  • polarization beam combining
  • slow axis divergence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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