laser safety andras kis zettl group safety talk 11/16/2006
TRANSCRIPT
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Laser Safety
Andras KisZettl group safety talk
11/16/2006
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Laser Components
• Light Amplification by Stimulated Emission of Radiation
Associated hazards:
1. Laser Beam: eye injury, burns, skin cancer (UV), fire hazard
2. Active medium: toxic chemicals or gases (organic dyes, BeO in Ar lasers, HF, HeCd, HeHg, HeSe)
3. Excitation source: high voltage, water cooling
OPTICAL RESONATOR
excitation
Active medium
LASERbeam
high reflectancemirror
output couplermirror
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Human Eye- laser beam can be focused by cornea and the lens to a very tight spot on the retina
400-1400 nm<400, >1400 nm
<400, >1400 nm
Burns, cataracts
Retinal damage
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Eye Injury
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Eye Injury From A Pulsed Laser
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Skin Burns
• CO2 laser reflected from a metal surface
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Types of laser eye exposure
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Laser hazard classes
• Classification by wavelength and output power, according to their ability to produce damage
Class Power Remarks Typical examples
I Very low or beam completely enclosed
•Inherently safe,•No possibility of exposure
CD, DVD drives, laser printers…
II 1 mWVisible only
•Staring into the beam is hazardous•Eye protected by aversion response
Supermarket laser scanners, some pointers
IIIa 1-5 mW •Aversion may not be adequate Laser pointers
IIIb 5-500 mW •Direct exposure is a hazard Ar laser in Birge 123CF microscope in B219
IV >500 mW •Exposure to direct beam and scattered light is eye and skin hazard•Fire hazard
Laser ablation setup in Birge 266
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Labels on setups
Class IIClass IIIa with expanded beam
Class IIIa with small beamClass IIIbClass IV
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Safety measures
• Be informed
• Eyewear for classes IIIb, IV for everybody in the room
• Beam paths above >200 mW should be guided through tubes
• Highest risk during alignment, optical setup modification
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IIIb and IV requirements
• EHS 280 Laser Safety Training
• EHS 281 Laser Safety Retraining (every 3 years)
• On the Job Training – provided by PI/supervisor & documented in the Activity Hazard Document
• Laser eye exams
Links:
UCB laser safety
LBL laser safety