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How are lasers made?

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A typical red laser would contain a long crystal made of ruby (the medium, shown in the artwork below as a red bar) with a flash tube (yellow zig-zag lines) wrapped around it. read more

In 1962, Robert N. Hall demonstrated the first laser diode device, made of gallium arsenide and emitting at 850 nm in the near-infrared band of the spectrum. read more

Laser goggles are in the complementary color of the beam: green for a red 650 nm laser, orange-red for a blue 405 nm laser. Do not substitute a welding mask, smoked glass, or sunglasses for laser goggles. read more

Most LASERs in CD drives, pointers are diode LASERs. Like the name suggests, they have a diode that, unlike normal LEDs, emits light at a very specific frequency. The light is passed through a lens called a collimating lens to make it coherent and viola, you have a simple, cheap and efficient LASER. read more

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