Old 12-27-2014, 06:54 PM #1
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Default WTB: Large Diameter Negative FL Lens; 40mm/1.5 inch and up.

Looking for a large diameter negative focal length expander lens. The diameter can be 1.6 inches/40mm or larger, but must have a short -FL of 30mm or smaller, shorter is better.

This is for a second stage beam expander coupled with a 6" diameter 40" +FL PCX lens.

I also have a 12" diameter PCX lens with a 24" FL I'd like to use for a beam expander but have not found the right negative lens for it yet.

Will consider any large negative focal length lens up to 3 inch diameter for use at 532nm. I intend on using a 10 to 20X expander first and need something with a large enough diameter to accept its 20-40mm diameter beam.


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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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