Old 11-12-2009, 03:12 AM #1
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Default Has anyone tried this

Has anyone tried modulating the laser at 120Hz, for example, so that when you burn something a humming sound is produced. This hum would be similar to powering a CO2 laser with AC from a neon transformer.


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Old 11-13-2009, 03:54 AM #2
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Default Re: Has anyone tried this

First off, I would like to point out that the hum of a regular transformer is a low C, @ 60 Hz, not 120. And second, this would only work if the object resonated to the laser... and they already sell kits that transfer sound just like this...
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Old 11-13-2009, 04:10 AM #3
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Default Re: Has anyone tried this

I feel stupid right now.
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Old 11-13-2009, 05:58 AM #4
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Default Re: Has anyone tried this

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Originally Posted by Mohrenberg View Post
I feel stupid right now.
why is that?
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Old 11-13-2009, 07:03 AM #5
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Default Re: Has anyone tried this

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Originally Posted by CHP View Post
Has anyone tried modulating the laser at 120Hz, for example, so that when you burn something a humming sound is produced. This hum would be similar to powering a CO2 laser with AC from a neon transformer.

Yes, many industrial lasers are Q-Switched, this is done to produce high energy pulses instead of a continuous output, it makes it easier to cut some materials. The rate it is pulsed at depends on the cavity, and there are ideal frequencies which will produce maximum power or maximum energy.

Some can be very low pulse rate while others can be very high. My Lightwave 210G runs best at 7khz for power and about 500hz for energy. The 500hz has to do with the upper state lifetime of the gain medium.



If you guys would like me to do a writeup on q-switching, I would be happy to do so, lemme know.
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Old 11-13-2009, 08:52 AM #6
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Default Re: Has anyone tried this

Quote:
If you guys would like me to do a writeup on q-switching, I would be happy to do so, lemme know

please do....
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Old 11-13-2009, 01:36 PM #7
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Default Re: Has anyone tried this

Quote:
Originally Posted by ossumguywill View Post
First off, I would like to point out that the hum of a regular transformer is a low C, @ 60 Hz, not 120. And second, this would only work if the object resonated to the laser... and they already sell kits that transfer sound just like this...
1) If I drive a CO2 laser with AC from 60Hz I get 120 pulses per second. You get 2 discharges per cycle.

2) I've done this exact thing with a focused CO2 laser. You do hear a noise from the burning target.

3) When material heats, it distorts and hence the sound. By hitting a target with pulses you are forcing it to distort - just like knocking on a door - the door isn't resonating to the frequency of your knock, but providing its impulse response to each impulse of your knock.
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Old 11-13-2009, 01:44 PM #8
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Default Re: Has anyone tried this

Quote:
Originally Posted by Laser_Ben View Post
Yes, many industrial lasers are Q-Switched, this is done to produce high energy pulses instead of a continuous output, it makes it easier to cut some materials. The rate it is pulsed at depends on the cavity, and there are ideal frequencies which will produce maximum power or maximum energy.

Some can be very low pulse rate while others can be very high. My Lightwave 210G runs best at 7khz for power and about 500hz for energy. The 500hz has to do with the upper state lifetime of the gain medium.



If you guys would like me to do a writeup on q-switching, I would be happy to do so, lemme know.
I wasn't think Q-switched, although I think this would be a good writeup. Some commercial laser drives have a TTL modulation input, and I was curious if someone tried modulating their laser. I didn't know if the modulated focused power density from a high power red LD would be enough to force a sound from the target. I wasn't thinking about super pulsing the LD either where instead of running at 400 mA DC you would run at 800mA peaks for a 50% duty cycle.

If power density is sufficient to produce sound, the laser's current can be analog modulated with sound, music, etc. to play music while you are burning something. Maybe we can hook it up to an ipod and called it the I-laser?????
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Old 11-13-2009, 03:16 PM #9
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Default Re: Has anyone tried this

Quote:
If power density is sufficient to produce sound, the laser's current can be analog modulated with sound, music, etc. to play music while you are burning something. Maybe we can hook it up to an ipod and called it the I-laser?????
That is the best fucking idea I have heard in a long time!
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Old 11-13-2009, 03:24 PM #10
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Default Re: Has anyone tried this

I have tried using ~200 mW red lasers in pulse modulation, duty cycles varying from a few percent to 99% or so, with frequencies in the audible range (few kHz).

It doesnt actually produce much of a sound from whatever you are burning. Mostly, you dont hear anything at all, sometimes a very slight bit of the operating frequency.

I suppose it has to do with the small peak power of the diode laser - you can't run it at 100x nominal power for a 1% duty cycle since the damage limit is optical, not (just) thermal.

Perhaps its possible to get a more audible result with higher powered diodes, maybe IR that can deliver a few watts peak power, or even the recent high powered bluray diodes. I think it works in principle, just not in practice due to power limitations.
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Old 11-13-2009, 03:27 PM #11
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Default Re: Has anyone tried this

Quote:
Originally Posted by CHP View Post
1) If I drive a CO2 laser with AC from 60Hz I get 120 pulses per second. You get 2 discharges per cycle.

2) I've done this exact thing with a focused CO2 laser. You do hear a noise from the burning target.

3) When material heats, it distorts and hence the sound. By hitting a target with pulses you are forcing it to distort - just like knocking on a door - the door isn't resonating to the frequency of your knock, but providing its impulse response to each impulse of your knock.
Interesting... I've modulated high-voltage electricity to make a 20-200 hz speaker with a spark , but I always assumed that the heat generated by a pulsed laser would not dissipate fast enough from the target to make significant growth/shrinking.
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Old 11-13-2009, 03:30 PM #12
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Default Re: Has anyone tried this

Put a row of slightly overinflated black balloons in the way....

It will make sounds, really it will.
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Old 11-13-2009, 03:43 PM #13
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Default Re: Has anyone tried this

Only once though

The effect with a laser is nothing like what you get from a modulated spark - that has actual application in plasma tweeters.
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Old 11-13-2009, 06:21 PM #14
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Default Re: Has anyone tried this

Yes, it works, but only under the right conditions. I've seen a video of a Ti:Sapphire burning stuff, and it would give a high pitched hum on contact with the material.
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Old 11-13-2009, 07:18 PM #15
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Default Re: Has anyone tried this

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Originally Posted by Cyparagon View Post
Yes, it works, but only under the right conditions. I've seen a video of a Ti:Sapphire burning stuff, and it would give a high pitched hum on contact with the material.
Why the hell would you use an ultrafast system to burn something?
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Old 11-21-2009, 12:40 AM #16
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Default Re: Has anyone tried this

Maybe precision etching??
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