Wavelength & Hologram Brightness
On: Mon, Aug 06, 01 02:45:05 PM
|I'm curious what people's opinions are on using the
laser diodes in the 650-658nm range are compared
with the shorter wavelength ones. It seems that all of
the 35mw diodes run at 650-658nm, but I'm wondering
if my holograms will look better with a 15mw laser at
640nm instead. Is the perceived brightness of a
reflection hologram made at 658nm really that much
brighter than one made with a 640nm one?
Colin - Mon, Aug 06, 01 08:13:00 PM You can shift the replay wavelength of a reflection
hologram to any desired frequency with your processing. 22.214.171.124
Ray R - Tue, Aug 07, 01 01:44:57 AM prensensitize with TEA.
Colin - Tue, Aug 07, 01 10:22:54 AM Or with pfg-01 the exposure time controls the playback
frequency. For transmision holograms you are stuck with the
lasers frequency. Since the usual use for a transmision
hologram is in h1 to h2 copies I have not found this to be
a problem since the h2 is often a rainbow hologram or a
reflection hologram. 126.96.36.199
Charles - Thu, Jan 24, 02 03:10:15 AM Colin, I have never heard of PFG-01 changing it's re-play
wavelength with different exposure times, please let me know
where you saw this.
Colin - Thu, Jan 24, 02 10:24:56 PM Charles,
It is a regular exercise in my studio, but, I believe it is
the bleach in the JD-2 developing sequence. It is the
method Dr. Jeong recomends for JD-2.
I think it removes all of the developed silver causing the
emultion to shrink. I would have to reread the chapter on
bleaching in Silver-Halide Recording Materials to know for
sure. If you really want me to email me at
firstname.lastname@example.org and I will research it further.
Thilo K. - Sat, Feb 16, 02 05:50:52 PM Colin, you´re right; the replay wavelengh is increased
indeed. I think that is a problem owing to the image´s
brightness: exposure time influences the brightness - so can
i ever make a green _and_ bright hologram ? 188.8.131.52
Ben - Mon, Feb 17, 03 12:48:48 AM I'm extremely interested in holography. Just wondering if
anyone would be willing to help a guy get started. What
kind of equipment would I need?(basics). Any help would be
greatly apprecited!? Thanks!
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