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AdLIGO PSL Safety Plan

AdLIGO PSL Safety Plan. Peter King LIGO Laboratory – Caltech LIGO/VIRGO March 2007 Lasers Working Group G070136-00-D. AdLIGO PSL Laser Safety Plan. The laser safety is to be based on ANSI Z136.1.

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AdLIGO PSL Safety Plan

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  1. AdLIGO PSL Safety Plan Peter King LIGO Laboratory – Caltech LIGO/VIRGO March 2007 Lasers Working Group G070136-00-D

  2. AdLIGO PSL Laser Safety Plan • The laser safety is to be based on ANSI Z136.1. • No fundamental changes from Z136.1-2000 to Z136.1-2007 as far as calculation of the maximum permissible exposure (MPE) levels and the accessible emission limit (AEL) is concerned. • With the advent of the 200 W laser, now is a good time to review our practices. • Are existing practices sufficient? Unwieldy? • What, if any, changes shall we make? Advanced LIGO

  3. The Eye • Why bother? • Eye injuries tend to be irreversible in nature. • Even low power beams can produce high intensity spots on the retina. Advanced LIGO

  4. Terminology • Accessible Emission Limit (AEL) • The maximum accessible emission level within a class of laser that human eye or skin may be exposed to. • For a Class 4 laser operating at 1064nm the AEL is 0.5 W. • Maximum Permissible Exposure (MPE) • The level of exposure that can be thought of as the border line between safe and potentially harmful. The MPE depends on the wavelength and exposure duration. • Two MPEs apply: ocular and skin exposure MPE. Advanced LIGO

  5. The Advanced LIGO Laser • Assumed properties: • wavelength l = 1064 nm • total power P = 200 W • output beam size w0 = 150 – 200 mm • Also need to consider the output of the pump diodes: • wavelength lp = 808 nm • total power Pp = 315 W • output beam size wp = 1 mm • For classification purposes: • 200-W laser is an extended source • pump diodes are a small source Advanced LIGO

  6. Power Levels • At 1064 nm: • ocular AEL is 4.4 mW • skin exposure AEL is 96 mW • At 808 nm: • ocular AEL is 118 mW • skin exposure AEL is 32 mW • Dump all beams above the ocular MPE – mandatory. Advanced LIGO

  7. Safety Eyewear Requirement • The optical density (OD) of laser safety eyewear must bring the output power of the source down to the ocular MPE level. • minimum OD of +4.7 at 1064 nm • minimum OD of +5.7 at 808 nm Advanced LIGO

  8. Suggested Plan • Restricted access to diodes and laser. • Use beam tubes. • During installation, manipulation of objects in the high power beam path requires a person to scan the optical table during the activity. • Use of phone or intercom link to coordinate activities between the diode enclosure and the laser enclosure (if any). Advanced LIGO

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