Making a traditional glass lens requires a lot of experience, skill, and patience grinding a piece of glass to the required shape, and is not for the casual experimenter. Making a glass Fresnel ...

After the Fresnel lens, the light is fed through a second ... of 80 W from his 1,064-nm-wavelength solar-pumped laser — enough to cut a steel plate — he says. The aim is push this to 400 ...

You’ll also need a focusing lens (just a few dollars), some thermal glue, an LM317, a resistor, and a pair of protective goggles matching the laser diode’s wavelength. He fits the diode into ...