Re: ferri sesquichlorati
...off to the library :-)
Sounds right FEPVA or fe doped pva is what I remember.
Think I saw this in one "processes in photoreactive polymers" but
explanation was a bit short and not too clear.
But yes, the most impressive part of ferric chloride is its low sensitivity
(don't think 488 nm would be the optimum for ferric really, have done some
spectral scanning of AFC and FO and don't think there was much absorbency at
least, in that area, but I am not too familiar with the needs of holography,
I assume they have a reason for using 488. Let me guess, the laser/light
source emits at 488 nm ?)
On 10/23/06 1:37 PM, "martinm" <email@example.com> wrote:
> ----- Original Message -----
> From: "Halvor Bjørngård" <firstname.lastname@example.org>
> To: <email@example.com>
> Sent: Sunday, October 22, 2006 4:06 PM
> Subject: Re: ferri sesquichlorati
>> Have seen a brief descriptions of ferric used as a crosslinker for
>> holography with PVA.. But have yet to chase down the references..
> Metal-ion-doped polymer systems for real-time holographic recording, Roger
> A. Lessard, Rupak Changkakoti, Gurusamy Manivannan Publication: Proc. SPIE
> Vol. 1559, p. 438-448, Photopolymer Device Physics, Chemistry, and
> Applications II; Roger A. Lessard; Ed. Publication
> Date: Dec 1991
> Cr(VI) and Fe(III) doped polymer systems as real-time holographic recording
> materials, Gurusamy Manivannan, Rupak Changkakoti, Roger A. Lessard
> Publication: Proc. SPIE Vol. 1622, p. 25-29, Emerging Optoelectronic
> Technologies; Krishna Shenai, Ananth Selvarajan, C. K. Patel, C. N. Rao, B.
> S. Sonde, Vijai K. Tripathi; Eds. Publication
> Date: Dec 1992
> At the recording wavelength - 488nm, I believe - speed of Fe(III) doped PVA
> was said to be approximately thirty times lower than for dichromated PVA.
> They did real-time recordings (no liquid processing) though...