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Laser Color Visibility

The human eye can see light in the visible spectrum ranging from Red to Violet, i.e. the colours of the rainbow. The eye's sensitivity is non linear, so different colours are perceived at different intensities to the eye. So for the same given power, a 100mW Red laser will appear much dimmer than a 100mw Green laser.The colour the human eye is most sensitive to is a shade of Green which has a wavelength of 555nm.
Wavelength	Response 	Color 	Typical Source/Application
 350 nm 	0.00001 	UV 	
 380 nm 	0.0002 	Near UV 	
 400 nm 	0.0028 	Border UV 	Nichia violet GaN laser diode
 410 nm 	0.0074 	Border UV 	Nichia violet GaN laser diode
 420 nm 	0.0175 	Violet 	
 442 nm 	0.0398 	Violet-blue 	Violet-blue line of HeCd laser
 450 nm 	0.0468 	Blue 	
 457.5 nm 	0.0556 	Blue 	Blue frequency doubled Nd:YVO
 457.9 nm 	0.0562 	Blue 	Blue line of argon ion lase
 473 nm 	0.104 	Blue 	Blue frequency doubled Nd:YAG
 488 nm 	0.191 	Green-blue 	Green-blue line of argon ion laser
 500 nm 	0.323 	Blue-green 	
 510 nm 	0.503 	Green 	Emerald green line of copper vapor laser
 514.5 nm 	0.588 	Green 	Green line of argon ion laser
 532 nm 	0.885 	Green 	Green frequency doubled Nd:YAG or Nd:YVO
 543.5 nm 	0.974 	Green 	Green HeNe lase
 550 nm 	0.995 	Yellow-green 	
 555 nm 	 1.000 	Yellow-green 	Reference (peak) wavelength
 567 nm 	0.969 	Yellow-green 	Green line of Helium-Mercury laser
 568 nm 	0.964 	Yellow-green 	Y-G line of some krypton ion lasers
 578 nm 	0.889 	Yellow 	Gold line of copper vapor laser
 580 nm 	0.870 	Yellow 	
 594.1 nm 	0.706 	Orange-yellow 	Yellow HeNe laser
 600 nm 	0.631 	Orange 	
 611.9 nm 	0.479 	Red-orange 	Orange HeNe laser
 615 nm 	0.441 	Red-orange 	Orange line of Helium-Mercury laser
 627 nm 	0.298 	Red-orange 	Orange line of Gold Vapor Laser
 632.8 nm 	0.237 	Orange-red 	Red HeNe laser
 635 nm 	0.217 	Orange-red 	Laser diode (DVD, newer laser pointers)
 640 nm 	0.175 	Orange-red 	Laser diode (DVD, newer laser pointers)
 645 nm 	0.138 	Orange-red 	Laser diode (DVD, newer laser pointers)
 647.1 nm 	0.125 	Red 	Red line of krypton or Ar/Kr ion laser
 650 nm 	0.107 	Red 	Laser diode (DVD, newer laser pointers)
 655 nm 	0.082 	Red 	Laser diode
 660 nm 	0.061 	Red 	Laser diode
 670 nm 	0.032 	Red 	Laser diode (UPC scanners, old pointers)
 680 nm 	0.017 	Red 	
 685 nm 	0.0119 	Deep red 	
 690 nm 	0.0082 	Deep red 	
 694.3 nm 	0.006 	Deep red 	Ruby laser
 700 nm 	0.0041 	Border IR 	
 750 nm 	0.00012 	Near IR 	
 780 nm 	0.000015 	Near IR 	CD player/CDROM/LaserDisc laser diode
 800 nm 	3.7*(10)-6	Near IR 	Laser diodes for pumping Nd:YAG, Nd:YVO
 850 nm 	1.1*(10)-7 	Near IR 	Laser diodes for pumping Nd:YAG, Nd:YVO
 900 nm 	3.2*(10)-9 	Near IR 	Laser diodes for pumping Nd:YAG, Nd:YVO
 1,064 nm 	3*(10)-14 	Near IR 	Nd lasers (including YAG)
 1,523 nm 	0.0000 	Near IR 	IR HeNe laser
 3,390 nm 	0.0000 	Mid-IR 	IR HeNe laser
 10,600 nm 	0.0000 	Far-IR 	CO2 laser
The DPSS Lasers of 532nm is very close to the peak of the eye's sensitivity. The human eye is most sensitive to the color green. Therefore, green laser pointers actually stand out in brightness compared to all other visible lasers including red, blue,violet and yellow laser pointers. The greens and blues produced by a typical argon are further away from the peak response of the eye, so they appear to be dimmer in comparison. This is why DPSS laser are said to be 3 to 4 times brighter than a typical argon laser. So a 100mW DPSS laser will look the equivalent to a 300mw argon laser in terms of apparent brightness. Taking this to an extreme, if you were to compare a 100mw 532nm Diode laser with a 2W Infrared Laser e.g. emitting 1064nm, the 100mW laser will look much brighter because the human eye can't see infrared wavelengths!