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James,

If you can do it a stack for a silver mirror that is reported to be
highly stable is:


Glass - NiCrNx (8?) - silver (1200?) - NiCrNx(2-8?) - SiNx (100?)
[146a]. The NiCrNx seems to act as a nucleating layer for both the
silver and the SiNx protective layer.

146a. J.D. Wolfe, R.E. Laird, C.K. Carniglia and J.P Lehan, p. 115 in Technical
Digest OSA, Optical Interference Coatings Conference (1995); also
P.D. Fuqua and J.D. Barrie, "Optical Properties and Corrosion
Resistance of Durable Silver Coatings," p. 85 in Properties and
Processing of Vapor-Deposited Coatings, edited by R. Johnson, W. Lee,
M. Pickering, B. Sheldon, Material Research Society Proceedings, Vol.
555 (1998)

Regards,

Don Mattox

Hi Al,

Looks like you have some seriously nice 'Toys' there! :)

I have a few questions if I may,

Any pictures? Especially ones documenting the E-beam layout,
distance from source to target, number of sources, Chamber details,
etc..

Can you tell us some more about this optical thickness monitoring
method? (links are fine, just curious about the theory behind it..)

If you ever have some free time, might you consider evaporating some
of my 'secret sauce' (aka Reynolds Wrap, ~100nm thick) onto a
surface and measure its reflectivity for me? Since I'm pretty much
financially stuck with Tungsten thermal sources (there cheap!) I'm
left to play with only single layer coatings. So far my 'secret
source' (an alloy of Al, Fe, SI) physically appears superior to pure
Al in many ways (good adhesion, very few pinholes (often none), and
significantly more resistant to scratch/sleeks during intentionally
torturous cleanings), however I have often wondered about its
reflectivity... (it looks shiny :)

Protected Silver, WOW! That's a visible wavelength dream come true :)

Thanks,
James Lerch
<> (My telescope
construction,testing, and coating site)

----- Original Message -----
From: <mailto:amisiuk@...>sloanpk2000
To: <mailto:VacuumX@...>VacuumX@...
Sent: Monday, March 31, 2003 9:54 AM
Subject: [VacuumX] New Member - Al M Sirius Optics

Hi,
This is an imteresting group. I have been involved in thin films for
about 20 years.

We have 3 E-beam systems, utilizing cryo-pumps for deep vaccum. Other
equipment includes spectrometers, photometers, and
spectralradiometers. We use crystal monitoring for thickness
monitoring. We are now placing and optical monitoring system for
improved accuracy. The E-beam power supplies are 2 10KV an 1 14KV
system. We feed these power supplies with 3 phase 220V at 100Amp. Two
of them are air-cooled. The 14KV system is water cooled.

I usually design and make interference filters. This weekend, I
coated 12 mirrors from 6" to 10" in size and about 50 diagonals.

I found an interesting combo of layers that I really like. It starts
with about 20nm of Chromium, followed by 130nm of Aluminum and
finished with 4 layers of Tantalum Pentoxide(Ta2O50) and SiO2 for
enhancement and protection. I get about 94% reflectivity with this
combo. I find that very few people use Ta2O5.

I found that the thin Chromium layer all, but eliminates pinholing.
The Ta2O5 is an extremely adherent material and combines very well
with SiO2. I have silver mirrors that I coated the same way. I have
one mirror in my MN56 that is over 3 years old and is still like
brand new. The reflectivity of that mirror is about 97%.


Al M


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____________________________________
Donald M. Mattox
Technical Director
Society of Vacuum Coaters
71 Pinon Hill Place NE
Albuquerque, NM 87122-1914

Telephone 505/856-7188
FAX 505/856-6716
E-mail donmattox@...
WebSite

Hi,
I have also silver coated glass and used Zirconium Dioxide(ZrO2) and
SiO2 as enhancing layers. ZrO2 is wickedly tough and requires a great
deal of power to evaporate. The chamber become very hot after
evaporating ZrO2. I have done a few of these for friends and it seems
to have an indefinite life. I feel that its very important to have
multiple layers to fully protect silver.

I may try the Reynolds Wrap aluminum later this weeks. I'll need
about 200g to place in the crucible. I may just melt it in the kiln.


Al M



--- In VacuumX@..., SVC <donmattox@s...> wrote:

James,

If you can do it a stack for a silver mirror that is reported to be
highly stable is:


Glass - NiCrNx (8?) - silver (1200?) - NiCrNx(2-8?) - SiNx (100?)
[146a]. The NiCrNx seems to act as a nucleating layer for both the
silver and the SiNx protective layer.

146a. J.D. Wolfe, R.E. Laird, C.K. Carniglia and J.P Lehan, p. 115

in Technical

Digest OSA, Optical Interference Coatings Conference (1995); also
P.D. Fuqua and J.D. Barrie, "Optical Properties and Corrosion
Resistance of Durable Silver Coatings," p. 85 in Properties and
Processing of Vapor-Deposited Coatings, edited by R. Johnson, W.

Lee,

M. Pickering, B. Sheldon, Material Research Society Proceedings,

Vol.

555 (1998)

Regards,

Don Mattox

Hi Al,

Looks like you have some seriously nice 'Toys' there! :)

I have a few questions if I may,

Any pictures? Especially ones documenting the E-beam layout,
distance from source to target, number of sources, Chamber

details,

etc..

Can you tell us some more about this optical thickness monitoring
method? (links are fine, just curious about the theory behind

it..)

If you ever have some free time, might you consider evaporating

some

of my 'secret sauce' (aka Reynolds Wrap, ~100nm thick) onto a
surface and measure its reflectivity for me? Since I'm pretty

much

financially stuck with Tungsten thermal sources (there cheap!) I'm
left to play with only single layer coatings. So far my 'secret
source' (an alloy of Al, Fe, SI) physically appears superior to

pure

Al in many ways (good adhesion, very few pinholes (often none),

and

significantly more resistant to scratch/sleeks during

intentionally

torturous cleanings), however I have often wondered about its
reflectivity... (it looks shiny :)

Protected Silver, WOW! That's a visible wavelength dream come

true :)

Thanks,
James Lerch
<> (My

telescope

construction,testing, and coating site)

----- Original Message -----
From: <mailto:amisiuk@w...>sloanpk2000
To: <mailto:VacuumX@...>VacuumX@...
Sent: Monday, March 31, 2003 9:54 AM
Subject: [VacuumX] New Member - Al M Sirius Optics

Hi,
This is an imteresting group. I have been involved in thin films

for

about 20 years.

We have 3 E-beam systems, utilizing cryo-pumps for deep vaccum.

Other

equipment includes spectrometers, photometers, and
spectralradiometers. We use crystal monitoring for thickness
monitoring. We are now placing and optical monitoring system for
improved accuracy. The E-beam power supplies are 2 10KV an 1 14KV
system. We feed these power supplies with 3 phase 220V at 100Amp.

Two

of them are air-cooled. The 14KV system is water cooled.

I usually design and make interference filters. This weekend, I
coated 12 mirrors from 6" to 10" in size and about 50 diagonals.

I found an interesting combo of layers that I really like. It

starts

with about 20nm of Chromium, followed by 130nm of Aluminum and
finished with 4 layers of Tantalum Pentoxide(Ta2O50) and SiO2 for
enhancement and protection. I get about 94% reflectivity with this
combo. I find that very few people use Ta2O5.

I found that the thin Chromium layer all, but eliminates pinholing.
The Ta2O5 is an extremely adherent material and combines very well
with SiO2. I have silver mirrors that I coated the same way. I have
one mirror in my MN56 that is over 3 years old and is still like
brand new. The reflectivity of that mirror is about 97%.


Al M


Yahoo! Groups Sponsor ADVERTISEMENT

<

705063107:HM/A=1513703/R=0/*

0

0_06F/g22lp?Target=mm/g22lp.tmpl>
To unsubscribe from this group, send an email to:
VacuumX-unsubscribe@...



Your use of Yahoo! Groups is subject to the
<>Yahoo! Terms of Service.

____________________________________
Donald M. Mattox
Technical Director
Society of Vacuum Coaters
71 Pinon Hill Place NE
Albuquerque, NM 87122-1914

Telephone 505/856-7188
FAX 505/856-6716
E-mail donmattox@s...
WebSite