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Visible Lasers

Definition: lasers (or other laser-based light sources) emitting visible light

German: sichtbar emittierende Laser

Categories: lasers, nonlinear optics

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The term visible lasers is used to denote lasers emitting visible light, or sometimes laser devices generating visible light via nonlinear frequency conversion.

Lasers with Direct Visible Emission

Laser which directly emit visible light constitute a minority – most lasers emit in the infrared spectral region. Some examples of solid-state lasers emitting visible light are:

  • Various laser diodes can emit visible light. Examples are GaInP and AlGaInP-based red laser diodes, and GaN-based blue-emitting diodes.
  • The first demonstrated laser was a ruby laser emitting at 694.3 nm.
  • Titanium–sapphire lasers emit mostly in the infrared spectral region, but can be tuned down to roughly 650 nm.
  • Gallium nitride laser diodes emit around 400–480 nm.
  • There are various upconversion lasers, including both bulk and fiber lasers, with visible light emission.

There are also various gas lasers emitting visible light:

  • Helium–neon lasers can emit on various visible wavelengths, including the well-known 632.8 nm red wavelength but also in the green (543.5 nm), yellow (594.1 nm) and orange (604.6, 611.9 nm) spectral region.
  • Helium–cadmium lasers (→ gas lasers) emit in the blue at 441.6 nm.
  • Argon ion lasers emit mostly at 514.5 and 488 nm, but also at 465.8, 472.7 and 528.7 nm.
  • Krypton ion lasers emit at various wavelengths throughout the visible spectrum, in particular at 647.1 nm and 530.9 nm.
  • Copper vapor lasers (→ gas lasers) emit at 510.6 or 578.2 nm.

Finally, various dye lasers have broad emission ranges throughout the visible spectral region.

See also the articles on red, green and blue lasers.

Visible Laser Systems Based on Nonlinear Frequency Conversion

Various methods allow the generation of visible light in laser diodes via nonlinear frequency conversion:

See also: red lasers, yellow and orange lasers, green lasers, blue lasers, nonlinear frequency conversion, intracavity frequency doubling, Raman lasers, supercontinuum generation, white light sources
and other articles in the categories lasers, nonlinear optics

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