Working with Lasers: Safety Procedures & Intensity

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SUMMARY

This discussion focuses on safety procedures for using lasers, specifically 780nm infrared (IR) lasers and 650nm red lasers, with intensities below 5mW. Participants emphasize the importance of protective eyewear and enclosures for lasers rated above 1mW, particularly for IR lasers, which pose unique risks due to their invisibility. Key safety measures include using appropriate filter glasses, understanding laser classifications, and implementing manual power interlocks. The conversation also highlights the electrical hazards associated with lasers and the need for proper voltage regulation when powering multiple lasers.

PREREQUISITES
  • Understanding of laser classifications (Class 3R and Class 3B)
  • Knowledge of laser safety regulations and exposure limits
  • Familiarity with voltage regulation techniques (e.g., using a 3V regulator)
  • Basic electronics principles, including current flow and resistor calculations
NEXT STEPS
  • Research laser safety guidelines from authoritative sources like Kentek and Vanderbilt University
  • Learn about laser power measurement techniques and tools
  • Explore voltage regulation methods for powering multiple laser types
  • Investigate the effects of different wavelengths on human vision and safety precautions
USEFUL FOR

Laser hobbyists, optical engineers, safety officers, and anyone involved in projects utilizing lasers, especially in educational or experimental settings.

  • #31
Lambduh said:
This webpage has plenty of information on laser diodes.
http://www.repairfaq.org/sam/laserdps.htm
Yup, Sam is a good source for info.

There is even an entire list of schematics for diode drivers if you want to build one of your own.
http://www.repairfaq.org/sam/laserdps.htm#dpscld
It seems the OP's laser modules already include a driver circuit. He just has to supply them with 3V or 6V or whatever.
 
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  • #32
Hey guys, i don't know much about lasers but i bought a laser pen overseas and my buddy told me it was too strong and could burn things. The sticker says class III, 100mW wavelength 650. Should I be concerned?
 
  • #33
rob in rowlet said:
The sticker says class III, 100mW wavelength 650. Should I be concerned?


Class IIIb
Lasers in this class may cause damage if the beam enters the eye directly. This generally applies to lasers powered from 5–500 mW. Lasers in this category can cause permanent eye damage with exposures of 1/100th of a second or less depending on the strength of the laser. A diffuse reflection is generally not hazardous but specular reflections can be just as dangerous as direct exposures. Protective eyewear is recommended when direct beam viewing of Class IIIb lasers may occur. Lasers at the high power end of this class may also present a fire hazard and can lightly burn skin.
So yes - be concerned
 
  • #34
Welcome to Physics Forums.

Yes, you should be very careful!

Legally, you can only buy 5 mW max in the U.S.

To burn things you'd probably need a lens to focus the beam to a smaller area, but yes it should be possible.
 

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