Jul 29, 2015
liar
Jul 29, 2015
how could a laser be used for room lighting? by reflection?
Jul 29, 2015
how could a laser be used for room lighting? by reflection?

That is how conventional room lighting works. It would be no different with a laser.

This article should state that a white semi-conductor laser has not yet been developed. Argon and Krypton together in a laser will produce white light unless the laser is selectively tuned. Argon produces green and blue, and krypton produces red. Combined argon and krypton lasers have been around for a long time.
Jul 29, 2015
I hate to be the guy who comments on the article about something barely relevant but what is with pictures in this website's articles frequently being cut off and incomplete? Why is it so tricky to publish a full picture?
Jul 29, 2015
I seem to remember learning that coherence is the property responsible for making laser light so useful. If that is true, it's not clear how a combination of three arbitrary phase, harmonically unrelated wavelengths of light can result in a 'white laser'.
Jul 29, 2015
@ereeves, it's called a white laser because the combined color of the lasers is perceived by the human eye as white. It's the same concept as used in monitors, TV's, projectors, etc. They combine the light from red, green and blue phosphors (cathode ray TV sets, plasma displays) or LED's (OLED displays) or from a backlight filtered into red, green and blue components (LCD displays) to produce white and a rainbow of other colors.

"White" light can be as simple as 3 narrow bands of red, green and blue combined from an LED or laser or it can be a complex mix of multispectral light from a hot incandescent tungsten filament (standard light bulb), ionized gas (like xeon in an HID lamp), fluorescence of different phosphors, or the nuclear fusion of a nearby star.
Jul 29, 2015
This article is outrageously ridiculous..
Jul 29, 2015
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Aug 01, 2015
swordsman claimed
It will be tricky trying to get three parallel laser diodes in the future
No.

swordsman stated
Series connection? Diodes do not like to be connected either in parallel or series mode
Current state of the art re semiconductor controls has left that paradigm behind at least a decade or more back...

These days you can put a 100MHz+ 32 bit processor with ram on a die of 2x2mm, therefore it is possible to fabricate a pwm circuit with suitable power transistor for each laser diode in about the same space as it takes just to wire them together or even better mount each one under the lasing element & thus include close contact on die temperature, accelerometer, spectra feedback etc All at the spatial expense of adding only about 200 microns !

Great stuff going on in labs all over the world is so far ahead of the bulk of populist articles & comments here it just goes to show people benefit so much from a disciplined education & value of travel...
Aug 02, 2015
I seem to remember learning that coherence is the property responsible for making laser light so useful. If that is true, it's not clear how a combination of three arbitrary phase, harmonically unrelated wavelengths of light can result in a 'white laser'.


If I understand it correctly, it really isnt being used "as a laser". Its a laser being used as a light source. That is, not in the historically thought of uses for a laser.

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