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Old 06-19-2007, 01:49 PM #17
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Default Re: Low divergence optics

Purchase a lens with a focal length of -6mm, that is generally the lowest and easyist to find off the shelf lens you can buy.


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Old 07-21-2007, 09:37 PM #18
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Default Re: Low divergence optics

The beam specs are now variable. *I can remove the beam expander for the original beam profile (approx 1.4 mRad divergence) *Or add the beam expander and have a variable beam. *
None of this requires modding the Aries * *

I am using a Melles-Griot 09 LBZ 001 *3x Beam expander (specs/link in next reply)



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Old 07-21-2007, 09:38 PM #19
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Default Re: Low divergence optics

http://shop.mellesgriot.com/products...m=GlobalSearch

General Characteristics
Expansion Ratio: 3×
Wavelength Range: 415–700 nm
Minimum Focus Distance: 1.5 m
Laser Type: Ion and YAG
Wavefront Distortion: <[ch955]/4 (p-p) at 632.8 nm
Input Aperture: 7.32 mm
Maximum Input Beam Dimension (1/e2): 4.83 mm
Exit Aperture: 22.0 mm
Coating: HEBBAR™ /078
Mounting: 1-inch–32 TPI female
1-inch–32 TPI male with included C-mount adaptor
Housing Material: Black-anodized aluminum
Damage Threshold (cw): 70 kW/cm2
Damage Threshold (pulsed): 3.8 J/cm2 in 13 ns

Extended Description Details at Melles Griot_09LBZ001.pdf
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Old 07-21-2007, 09:49 PM #20
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Default Re: Low divergence optics

According to Pseudo's divergence claculator, here is how the beam profile is affected:
http://www.pseudonomen.com/lasers/ca...alculator.html

Original stock Aries: 1mm at aperature, 90 mm at 215 Ft = 1.36 mRAD = 1.4 mRad
With beam expander: 4mm at aperature, 50 mm at 215 Ft = 0.70 mRAD

The tradeoff is larger initial beam diameter - this means less burning power. However, now the beam is still small enough to be entirely contained within a normal magnifying glass at 200 ft.

I'll try to get a 200 foot match light...
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Old 07-22-2007, 08:02 AM #21
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Default Re: Low divergence optics

That is VERY impressive!! I am very glad this worked out for you It looks very nice. Let's see that burn... I'm excited about it

GL;
DDL
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Old 07-22-2007, 08:23 AM #22
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Default Re: Low divergence optics

DDL - here you go... Burning at 215 feet 8-)

http://www.laserpointerforums.com/fo...num=1185079181
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