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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 7 — Mar. 1, 2014
  • pp: 1247–1251

Improved Monoblock laser brightness using external reflector

A. D. Hays, John Nettleton, Nick Barr, Nathaniel Hough, and Lew Goldberg  »View Author Affiliations


Applied Optics, Vol. 53, Issue 7, pp. 1247-1251 (2014)
http://dx.doi.org/10.1364/AO.53.001247


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Abstract

The Monoblock laser has become the laser of choice in long-range, eye-safe laser range finders. It is eye-safe with emission at 1570 nm, high pulse energy, simple construction, and high efficiency when pumped by a laser-diode stack. Although the output beam divergence of a typical Monoblock with a 3mm×3mm cross section is relatively large (10–12 mrad), it can be reduced to <1mrad using a telescope with large magnification. In this paper we present a simple and compact technique for achieving significant reduction in the Monoblock beam divergence using a partial reflector that is placed a short distance from the optical parametric oscillator (OPO). Using a 38 mm long Monoblock with a 10 mm long potassium titanyl phosphate OPO, we achieved a beam divergence of <4mrad, corresponding to a >2.5× reduction from the unmodified laser. Performance using this technique with various feedback and etalon spacings is presented.

© 2014 Optical Society of America

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 12, 2013
Revised Manuscript: December 23, 2013
Manuscript Accepted: January 9, 2014
Published: February 24, 2014

Citation
A. D. Hays, John Nettleton, Nick Barr, Nathaniel Hough, and Lew Goldberg, "Improved Monoblock laser brightness using external reflector," Appl. Opt. 53, 1247-1251 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-7-1247


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References

  1. L. Goldberg, J. Nettleton, B. Schilling, W. Trussell, and A. D. Hays, “Compact laser sources for laser designation, ranging and active imaging,” Proc. SPIE 6552, 65520G (2007). [CrossRef]
  2. R. L. McCally, C. B. Bargeron, J. A. Bonney-Ray, and W. R. Green, “Laser eye safety research at APL,” Johns Hopkins APL Tech. Dig. 26, 46–55 (2005).
  3. R. Burnham, R. A. Soltzenberger, and A. Pinto, “Infrared optical parametric oscillator in potassium titanyl phosphate,” IEEE Photon. Technol. Lett. 1, 27–28 (1989). [CrossRef]
  4. J. E. Nettleton, B. W. Schilling, D. N. Barr, and J. S. Lei, “Monoblock laser for a low-cost, eye-safe, microlaser range finder,” Appl. Opt. 39, 2428–2432 (2000). [CrossRef]
  5. G. Hernandez, Fabry-Perot Interferometers (Cambridge University, 1988).
  6. K. Battou and K. Ait Ameur, “Transverse effects in compound resonators,” Opt. Commun. 183, 189–194 (2000). [CrossRef]

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