Soft Aperture Spatial Filtering: 1.5W in a Single Spatial Mode from a Highly Multi-Mode Laser Diode in an External Cavity

Mallachi Elia Meller, Idan Parshani, Leon Bello, David Goldovsky, Amir Kahana, Avi Pe'Er

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Broad area laser diodes are attractive for the high optical power they can produce. Unfortunately, this high power normally comes at the cost of severely reduced spatial coherence since the wide area of the diode wave-guide is inherently spatially multi-mode along the slow axis. We demonstrate a method to significantly improve the spatial coherence of a high-power broad-area diode by placing it in an external cavity that is mode selective. We design the cavity, such that the diode aperture acts as its own spatial filter, obviating the need for an intra-cavity slit-filter, and optimally utilizing the entire gain medium. We demonstrate this soft filtering method using wide diodes of 200 \rm {\mu m} and 300 \rm {\mu m} widths and compare its power-efficiency to the standard approach of hard-filtering with a slit. We obtain high-gain operation in a pure single-mode, demonstrating up to 1.5 W CW power at 1064 nm with excellent beam quality ( M{2}=1.3 at 90% power).

Original languageEnglish
Article number2000406
JournalIEEE Journal of Quantum Electronics
Volume59
Issue number5
DOIs
StatePublished - 1 Oct 2023

Bibliographical note

Publisher Copyright:
© 1965-2012 IEEE.

Keywords

  • CW
  • Diode lasers
  • external cavity
  • laser beam shaping
  • single mode

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