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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 4 — Feb. 14, 2011
  • pp: 2874–2885

Active beam position stabilization of pulsed lasers for long-distance ion profile diagnostics at the Spallation Neutron Source (SNS)

Robert A. Hardin, Yun Liu, Cary Long, Alexander Aleksandrov, and Willem Blokland  »View Author Affiliations

Optics Express, Vol. 19, Issue 4, pp. 2874-2885 (2011)

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A high peak-power Q-switched laser has been used to monitor the ion beam profiles in the superconducting linac at the Spallation Neutron Source (SNS). The laser beam suffers from position drift due to movement, vibration, or thermal effects on the optical components in the 250-meter long laser beam transport line. We have designed, bench-tested, and implemented a beam position stabilization system by using an Ethernet CMOS camera, computer image processing and analysis, and a piezo-driven mirror platform. The system can respond at frequencies up to 30 Hz with a high position detection accuracy. With the beam stabilization system, we have achieved a laser beam pointing stability within a range of 2 μrad (horizontal) to 4 μrad (vertical), corresponding to beam drifts of only 0.5 mm × 1 mm at the furthest measurement station located 250 meters away from the light source.

© 2011 OSA

OCIS Codes
(000.2170) General : Equipment and techniques
(000.3110) General : Instruments, apparatus, and components common to the sciences
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(260.5210) Physical optics : Photoionization
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: December 20, 2010
Revised Manuscript: January 14, 2011
Manuscript Accepted: January 17, 2011
Published: January 31, 2011

Robert A. Hardin, Yun Liu, Cary Long, Alexander Aleksandrov, and Willem Blokland, "Active beam position stabilization of pulsed lasers for long-distance ion profile diagnostics at the Spallation Neutron Source (SNS)," Opt. Express 19, 2874-2885 (2011)

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