Wide-bandwidth mode-hop-free tuning of extended-cavity GaN diode lasers

J. Hult, I.S. Burns, C.F. Kaminski

Research output: Contribution to journalArticle

57 Citations (Scopus)
530 Downloads (Pure)

Abstract

We present a new approach for extended-cavity diode-laser tuning to achieve wide mode-hop-free tuning ranges. By using a multiple piezoactuated grating mount, the cavity length and grating angle in the laser can be adjusted independently, allowing mode-hop-free tuning without the need for a mechanically optimized pivot-point mount. Furthermore, synchronized diode injection-current tuning allows diode lasers without antireflection coatings to be employed. In combination these two techniques make the construction of a cheap, efficient, and easily optimized extended-cavity diode laser possible. A theoretical analysis is presented for optimal control of piezoactuator displacements and injection current to achieve the widest possible mode-hop-free tuning ranges, and a comparison is made with measurements. The scheme is demonstrated for blue and violet GaN lasers operating at similar to 450 nm and similar to 410 nm, for which continuous tuning ranges exceeding 90 GHz have been achieved. Examples of applications of these lasers are also given.
Original languageEnglish
Pages (from-to)3675-3685
Number of pages11
JournalApplied Optics
Volume44
Issue number18
DOIs
Publication statusPublished - Jun 2005

Keywords

  • instrumentation
  • measurement
  • metrology
  • optical design
  • lasers
  • laser optics
  • diode lasers
  • tunable lasers

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