If you do not see a frame to the left, click on the lightning bolt to load the entire site. Construction and operation of any laser device is hazardous. Do not attempt to construct or operate a laser without adequate safeguards and safety practices. Most lasers involve high voltages, toxic chemicals, high vacuum, laser radiation and other hazards. The author specifically disclaims any and all liabilities associated with the construction and use of such devices.
Designs presented here are in the interests of providing information on operational principles only.
Now I don't want to discourage anyone from attempting to build their own laser but to be honest lasers, in general, are touchy devices to construct. Some types of lasers are simply too expensive or too complex for many amateurs to build. It is these lasers that this site will focus on. A HeNe laser is a good start for a hobbyist into lasers as it gives valuable experience at working with high voltages. Nitrogen lasers which produce intense pulses of UV light.