Spot size and effective focal length measurements for a fast axial flow CO{sub 2} laser

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Description

An evaluation of the variation in focal plane position and spot size for a 1,650 W fast axial flow CO{sub 2} laser was performed. Multiple measurements of the focused beam were taken at stepped intervals along the beam axis to create a composite representation of the focus region. Measurements were made at several power levels from low to full power for each of five nominally identical lenses. It was found that as laser output power increases, the minimum focused spot radius increases, and the position of minimum focus shifts toward the laser resonator. These effects were attributed to observed variations ... continued below

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12 p.

Creation Information

Steele, R.J.; Fuerschbach, P.W. & MacCallum, D.O. December 31, 1997.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

An evaluation of the variation in focal plane position and spot size for a 1,650 W fast axial flow CO{sub 2} laser was performed. Multiple measurements of the focused beam were taken at stepped intervals along the beam axis to create a composite representation of the focus region. Measurements were made at several power levels from low to full power for each of five nominally identical lenses. It was found that as laser output power increases, the minimum focused spot radius increases, and the position of minimum focus shifts toward the laser resonator. These effects were attributed to observed variations in the diameter of the beam entering the focusing lens. For the ZnSe (f = 127 mm) lenses examined, variations in spot radius and focal plane position were seen. Lenses with high rated absorption had a larger variation in spot size and effective focal length than those with low absorption. Lenses that had previously been degraded by welding had the greatest variation.

Physical Description

12 p.

Notes

OSTI as DE98005902

Source

  • 16. international congress on applications of laser and electro-optics, San Diego, CA (United States), 17-20 Nov 1997

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  • Other: DE98005902
  • Report No.: SAND--97-1301C
  • Report No.: CONF-971149--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/658456 | External Link
  • Office of Scientific & Technical Information Report Number: 658456
  • Archival Resource Key: ark:/67531/metadc710942

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  • December 31, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 14, 2016, 8:46 p.m.

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Steele, R.J.; Fuerschbach, P.W. & MacCallum, D.O. Spot size and effective focal length measurements for a fast axial flow CO{sub 2} laser, report, December 31, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710942/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.