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Fackel
Elite Laser
Joined: 24 Dec 2005
Posts: 143
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 Posted: 1/18/06, 5:49 PM Post subject: |
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Damm, now it was the first time i looked at the dot at the white wall the first time, becaus i wanted to see the beam inside.
The beam is damn godlike! more amazing than outside! |
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buster
Fusion Laser
Joined: 07 Nov 2005
Posts: 387
Movie(s): 2
Location: Virginia
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| Posted: 1/20/06, 3:03 PM Post subject: |
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| Athoul wrote: |
| 650nm can't be colimated to as small a size as 532nm. Also you can't colimate a beam smaller then it's source size. Both these factors have to be taken into consideration when trying to get a smaller beam. |
i think he means focus
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Phoenix - 75mW
Home made Blu-Ray Laser - Unknown mW  |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7547
Location: Canada
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buster
Fusion Laser
Joined: 07 Nov 2005
Posts: 387
Movie(s): 2
Location: Virginia
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| Posted: 1/21/06, 12:32 PM Post subject: |
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| Athoul wrote: |
| If you can't focus it smaller then the source, you definatly can't collimate it smaller. |
what he meant was to focus the dot smaller to burn better. not colimate smaller to burn better.
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Phoenix - 75mW
Home made Blu-Ray Laser - Unknown mW |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7547
Location: Canada
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thecheat
Wicked Lasers God
Joined: 13 Jan 2006
Posts: 3306
Picture(s): 213
Movie(s): 12
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| Posted: 1/21/06, 1:19 PM Post subject: |
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actually, i was wondering if you could make the beam smaller via a conxex and concave lens
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twisted transistor
Wicked Lasers God
Joined: 07 Jan 2006
Posts: 1303
Picture(s): 272
Movie(s): 43
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| Posted: 1/21/06, 2:30 PM Post subject: |
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well if you make the beam smaller wont eventually get bigger?
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 nice, I highly recommend these. |
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thecheat
Wicked Lasers God
Joined: 13 Jan 2006
Posts: 3306
Picture(s): 213
Movie(s): 12
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| Posted: 1/23/06, 3:51 PM Post subject: |
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if done right, hopefully the only cause of beam dispersion would be reflections in the air.
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nero_design
Wicked Lasers God
Joined: 02 Sep 2005
Posts: 1463
Picture(s): 98
Movie(s): 1
Location: Australia
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| Posted: 1/23/06, 10:13 PM Post subject: |
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| Fackel wrote: |
| How dangerous is the pulsar for the eyes compared to a 100mW greenie? |
The Pulsar is exactly as dangerous as any other laser of the same output. Nexus has stated this at the time of release of the Pulsar last year. Yes, the Pulsar can damage the delicate tissue of your retina in as little as 1/1200 second.
Remember that the retina will magnify the light entering the pupil and that laser light is magnified 100,000 times in intensity (see chart:) http://www.pbase.com/image/52123863.jpg
Take a look at this to see what happens if you mess around without caution or forget to wear safety glasses when pointing the laser about in your room full of glassware and chrome toys: (caution: 4x medical pictures of laser injury to the retina)
http://www.pbase.com/image/52123862.jpg
Since the Pulsar will etch through plastic garbage bags (albeit, more slowly than a 100mW green), caution must be applied to this laser like all others.
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Marco Nero
* Laser Gallery: http://www.pbase.com/nero_design/pro1wickedlasers
* Always use appropriate laser-safe eyewear when using higher powered lasers. |
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Fullmetal CX
Nexus Laser
Joined: 14 Nov 2005
Posts: 120
Location: Southwest Missouri
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| Posted: 2/01/06, 5:17 PM Post subject: |
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Exactly.
In short, the laser has the same power as a green laser, it just isn't visible to your eyes.
The Pulsar doesn't burn objects as well as the Nexus, because the beam isn't as focused. However, if it is shined into your eyes, the lens in your eye will focus it to a point, so the beam width isn't a factor for your eye, as it is for a balloon, or a match.
I guess a similar situation would be comparing it to a C02 laser. The beam is invisible, but it can still easily cause a lot of damage. |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7547
Location: Canada
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Gadgeteer
Wicked Lasers God
Joined: 30 Jan 2006
Posts: 2304
Location: North Texas
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| Posted: 2/04/06, 1:15 AM Post subject: red, ish, |
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Hey there TheCheat,
You were wondering about using a concave and convex lens to collimate the beam.
This works perfectly and we use it on laser engraving systems. The input is fed into a concave lens which diverges the beam and the convex lens brings it to a focus to the mark site or adjusted to focus at infinity if you want the smallest possible spot size in the distance. This "up-collimator" is actually a Galileo telescope. You could do the same thing with two positive lens with the second lens positioned beyond the focal point of the first lens and the beam is diverging.
Special coatings are not required and the typical MgF AR coatings will suffice at this wavelength.
JD
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