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DavidGuidos
Modified 10mW Greenie
Joined: 04 Dec 2005
Posts: 11
Location: Myrtle Beach, SC
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 Posted: 8/07/07, 11:27 AM Post subject: Modulation |
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I'd like to see a relatively inexpensive laser that could be modulated by a signal; something at audio or TTL/CMOS levels. That would open up a whole other world of experimentation.
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Take care,
David Guidos |
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krutsch16
Modified 10mW Greenie
Joined: 21 Aug 2006
Posts: 11
Location: Ohio
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| Posted: 8/14/07, 10:29 PM Post subject: |
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| What type of bandwidth does that intail and what kind of distance do you want it to travel. I work in fiber optics and there are inexpensive tranceivers available that use a RCLED, not technically a laser, but visible none the less and they output as much as 2dBm, which is roughly 1.6 miliwatts. You could transmit the light via fiber, or you can couple a collimating lens to the end of a fiber pigtail and transmit through the air. |
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likewhat
55mW Advanced Wicked Laser
Joined: 10 Jun 2007
Posts: 62
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| Posted: 8/15/07, 7:55 PM Post subject: Re: Modula |
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| DavidGuidos wrote: |
| I'd like to see a relatively inexpensive laser that could be modulated by a signal; something at audio or TTL/CMOS levels. That would open up a whole other world of experimentation. |
One way to do this is with an acousto optic modulator or AOM. You just shoot the laser through it and you get a diffracted beam and the through beam. You can very easily control the amplitude, and somewhat easily control the frequency of the diffracted beam. I have heard they use them in those giant copy machines. You can also just buy them but they are kinda expensive.
If you use just a diode you can just vary the current you are using to power it with. The supplies I used for diode lasers had an analog current modulation input that had like a 1 MHz bandwidth. You could probably build a driver for pretty cheap and use something like that. |
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yathern
Fusion Laser
Joined: 20 Aug 2006
Posts: 333
Location: Here, there.... Everywhere.
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| Posted: 9/26/07, 9:31 PM Post subject: |
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| im confused |
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MarioMaster
Fusion Laser
Joined: 05 Jun 2007
Posts: 307
Picture(s): 44
Movie(s): 7
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| Posted: 9/26/07, 10:52 PM Post subject: |
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| modulation is used in laser shows and data transfer systems, by changing the brightness of the laser at high speeds you are able to create patterns/transmit data where you couldn't if the laser was always on |
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yathern
Fusion Laser
Joined: 20 Aug 2006
Posts: 333
Location: Here, there.... Everywhere.
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| Posted: 9/27/07, 6:06 AM Post subject: |
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| ohhh... thats how they make all those cool vids with spyders? |
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MarioMaster
Fusion Laser
Joined: 05 Jun 2007
Posts: 307
Picture(s): 44
Movie(s): 7
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| Posted: 9/27/07, 4:06 PM Post subject: |
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| i don't think the spider can be modulated as easily with its tec cooling system and whatnot |
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