Whitelight RGB Diode Laser

A simple whitelight RGB laser diode based laser with TTL or analog modulation. Green DPSS laser 532nm @ 5mW from Ebay (taken out of a laser pointer pen). Red diode laser 650nm @ 80mW from DVD burner. Blue/Purple laser 405nm @ 15mW from PS3 BlueRay assembly purchased from Ebay. Dichroic mirrors sourced from a defunct LCD projector. Various other hardware like bolts and nuts are from Lowes/Home Depot/Ace Hardware. Diode drivers from Norm (of Norm's Laser Show ... google it). Nice kits. For more information contact me.

Category:

Science & Technology

Tags:

• Laser
• Diode
• DPSS
• Whitelight
• RGB
• Show
• DIY

[bestamerica]

why green laser light must have a cooling fan,,,

blue and red lasers are not need it cooling fan

[cfavreau]

The gree laser is a Diode Pumped Solid State laser. It cotains a couple of crystals and a infared laser diode to "pump" / excite the crystals. It is not really effiecient so it generates some extra heat. It does not get really hot by itself however the crystals are very temperature sensitive. The large block of aluminum and cooling fan are an attempt to stabalize the laser's output by keeping the temperature stable by using a large heat sinking mass. This did not work.

[cfavreau]

It did not work well. I repalced it with a better constructed green DPSS laser. The stability is also affected when modulating the laser too. The one shown in the video did not modulate (turn on/off) really well. That is another reason I replaced it.

I will post a follow up with the new RGB(V) laser build. It now sits in a laser projector. Really neat!

[c4r0hv]

Hi! Very good job! Could you write something more about the dichros? In what kind of projectors we can find them and how good are they for combining these wavelengths? I've made RGB laser like this but I used dichros from optical drives (DVD's and HD DVD's) and they're not so good - I have really big loss of green light in my system.

[cfavreau]

Thanks! I like your work too. Your laser experiments are top notch!

The projector I got the dichros form was an old SHARP LCD projector that used 3 monochrome LCD panels. The dichros were used to maybe split and then combine 3 primary colors modulated by the 3 monochrome LCD panels.  The projector is long long gone. It was a long time ago but I believe it was one of these:

Sharp LCD XG-E850

It worked then blew up because of a loose screw.

[cfavreau]

I do not know what my losses are. I have revamped the setup since then to include a ~100mW PHR-803T BlueRay diode and a 15mW green DPSS module in a big heat sink which modulates fairly well.  Losing alot of green light isn't so bad for color balance as that is usually what we have the most of.

[Thenerfman317]

actually thats a RGP setup to let you know so you might wanna change the title because people are looking for a RGB laser setup so you might get dislikes for that

[MNmiknik]

thumbs up if kipkay sent you

[c0ssu1]

very cool :DDD

[Zenodilodon]

A cheep hack, send power through the cell terminals on a 3.6 volt lithium ion smart cell PCB and then use a resister to calibrate the right voltage off the 3.6 volt output of the smart cell driver, because of the nature of lithium ion I found it to be a good way to control stable laser output as well.