Spatial Filter
On: Mon, Jul 30, 01 11:58:43 AM
Colin Kaminski wrote:
| <![CDATA[John Klayer was nice enough to send me a plan to build a
spatial filter and I am starting to build it. I have a
couple
of questions before I start.
What size pinhole would I use with a D&S Laser? I am going
to use a 10x and a 40x objective to start with (Thank
you for the advice Vidar) but I don't know what dimension of
the beam I should use for the calculations. Since the
beam is 3 to 1 elliptical do I use the major axis or the
minor axis or an average?
Secondly, Is there an inexpensive source for pinholes? I
usually find things at Edmund are twice what I pay if I shop
around.
TIA]]> |
RESPONSES
Michael S - Tue, Jul 31, 01 02:33:12 AM
<![CDATA[If anyone is interested I think I can get spatial filters
for around $60.00 used. Do I need one of these or anything
else with a laser diode on a small 4'x4' table for white
light reflection holograms? I'm assuming it will brighten
up the hologram. Let me know if you need a filter. My email
is mstoothoff@hotmail.com]]> 12.18.158.25
Colin - Sat, Aug 25, 01 02:30:08 AM
<![CDATA[I decided I would like to circularize the beam before the
spatial filter so I am passing it through a 75 mm
cylindrical lens and a 25 mm cylindrical lens. I gets me
close to circular. Within 3% I think. Now I just need to
make a spatial filter ... ]]> 64.167.148.132
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