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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 17 — Jun. 10, 2012
  • pp: 3936–3940

Compact laser transmitter delivering a long-range infrared beam aligned with a monitoring visible beam

Hong-Shik Lee, Haeng-In Kim, and Sang-Shin Lee  »View Author Affiliations

Applied Optics, Vol. 51, Issue 17, pp. 3936-3940 (2012)

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A compact laser transmitter, which takes advantage of an optical subassembly module, was proposed and demonstrated, providing precisely aligned collinear IR and visible beams. The collimated IR beam acts as a long-range projectile for simulated combat, carrying an optical pulsed signal, whereas the visible beam plays the role of tracking the IR beam. The proposed laser transmitter utilizes IR (λ1=905nm) and visible (λ2=660nm) light sources, a fiber-optic collimator, and a beam combiner, which includes a wavelength division multiplexing (WDM) filter in conjunction with optical fiber. The device was built via the laser welding technique and then evaluated by investigating the characteristics of the generated light beams. The IR collimated beam produced had a Gaussian profile and a divergence angle of 1.3mrad, and the visible monitoring beam was appropriately collimated to be readily discernible in the vicinity of the transmitter. The two beams were highly aligned within an angle of 0.004 deg as anticipated. Finally, we performed a practical outdoor field test to assess the IR beam with the help of a receiver. An effective trajectory was observed ranging up to 660 m with an overall detectable beam width of 60cm.

© 2012 Optical Society of America

OCIS Codes
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(120.1680) Instrumentation, measurement, and metrology : Collimation
(220.1140) Optical design and fabrication : Alignment
(060.2605) Fiber optics and optical communications : Free-space optical communication
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Lasers and Laser Optics

Original Manuscript: March 20, 2012
Revised Manuscript: May 4, 2012
Manuscript Accepted: May 5, 2012
Published: June 8, 2012

Hong-Shik Lee, Haeng-In Kim, and Sang-Shin Lee, "Compact laser transmitter delivering a long-range infrared beam aligned with a monitoring visible beam," Appl. Opt. 51, 3936-3940 (2012)

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