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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

AdLIGO PSL Safety Plan

Peter King

LIGO Laboratory – Caltech

LIGO/VIRGO March 2007

Lasers Working Group


Adligo psl laser safety plan
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

The eye
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


  • 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

The advanced ligo laser
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

Power levels
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

Safety eyewear requirement
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

Suggested plan
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