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Red Lasers

Definition: lasers emitting red light

More general term: visible lasers

German: rote Laser

Category: lasers

How to cite the article; suggest additional literature


This article deals with lasers emitting in the red spectral region, i.e. with a wavelength roughly around 625–700 nm. The following types of red lasers are the most common:

Light from lasers operating at somewhat longer wavelengths, such as 750 or even 800 nm, can still be perceived as red light, if it is sufficiently intense. (There is no sharp boundary between the visible and the infrared spectral regions.) It can, however, be hazardous to view such light, because such intensity levels required for good visibility can damage the retina.

Red lasers are applied e.g. as laser pointers, for optical data recording or retrieval (e.g. on DVDs), for laser projection displays, for interferometers, for pumping of certain solid-state lasers (e.g. Cr:LiSAF or Cr:LiCAF), and in medical therapies (e.g. photodynamic therapy).


The RP Photonics Buyer's Guide contains 75 suppliers for red lasers. Among them:

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[1]H. B. Seereze and C. M. Harding, “100 W 671 nm visible laser diode array”, Electron. Lett. 28 (23), 2115 (1992), doi:10.1049/el:19921357
[2]B. Lu et al., “400 mW continuous-wave diffraction limited flared unstable resonator laser diode at 635 nm”, Electron. Lett. 33, 1633 (1997), doi:10.1049/el:19971115
[3]W. R. Bosenberg et al., “2.5-W, continuous-wave, 629-nm solid-state laser source”, Opt. Lett. 23 (3), 207 (1998), doi:10.1364/OL.23.000207
[4]Sun et al., “Generation of 11.5 W coherent red-light by intra-cavity frequency-doubling of a side-pumped Nd:YAG laser in a 4-cm LBO”, Opt. Commun. 241, 167 (2004), doi:10.1016/j.optcom.2004.06.063
[5]J. E. Hastie et al., “High power CW red VECSEL with linearly polarized TEM00 output”, Opt. Express 13 (1), 77 (2004), doi:10.1364/OPEX.13.000077
[6]C. Du et al., “6-W diode-end-pumped Nd:GdVO4/LBO quasi-continuous-wave red laser at 671 nm”, Opt. Express 13 (6), 2013 (2005), doi:10.1364/OPEX.13.002013
[7]A. Härkönen et al., “High power frequency doubled GaInNAs semiconductor disk laser emitting at 615 nm”, Opt. Express 15 (6), 3224 (2007), doi:10.1364/OE.15.003224
[8]A. Richter et al., “Power scaling of semiconductor laser pumped praseodymium-lasers”, Opt. Express 15 (8), 5172 (2007), doi:10.1364/OE.15.005172
[9]P. Adamiec et al., “Tapered lasers emitting at 650 nm with 1 W output power with nearly diffraction-limited beam quality”, Opt. Lett. 34 (16), 2456 (2009), doi:10.1364/OL.34.002456

(Suggest additional literature!)

See also: lasers, helium–neon lasers, laser diodes, frequency doubling, blue lasers, green lasers, yellow and orange lasers, laser pointers
and other articles in the category lasers


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