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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 18 — Jun. 20, 2005
  • pp: 3675–3685

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

Johan Hult, Iain S. Burns, and Clemens F. Kaminski  »View Author Affiliations


Applied Optics, Vol. 44, Issue 18, pp. 3675-3685 (2005)
http://dx.doi.org/10.1364/AO.44.003675


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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 ∼450 nm and ∼410 nm, for which continuous tuning ranges exceeding 90 GHz have been achieved. Examples of applications of these lasers are also given.

© 2005 Optical Society of America

OCIS Codes
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(140.2020) Lasers and laser optics : Diode lasers
(140.3600) Lasers and laser optics : Lasers, tunable

History
Original Manuscript: October 6, 2004
Manuscript Accepted: January 20, 2005
Published: June 20, 2005

Citation
Johan Hult, Iain S. Burns, and Clemens F. Kaminski, "Wide-bandwidth mode-hop-free tuning of extended-cavity GaN diode lasers," Appl. Opt. 44, 3675-3685 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-18-3675


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