[Dsg-reflectivity] [EXTERNAL] Re: October 10, 2023 UV reflectivity test station meeting minutes

[Tyler Lemon]

Hi Anselm and Bill,

Yes, we have received the parts for the UV measurement tests.

We have a UV lamp, UV rated optical fibers, a collimator, and optics for the "re-collector" for getting light back in to a fiber. I also got a small integrating sphere and UV rated photodiode. The remaining thing to figure out for the tests is how to hold the optics in the correct orientation. I started looking into it and designed/3D-printed a prototype stand for the components, but haven't been able to test much beyond that.

Currently, I'm available from 8:30AM - 1:30PM on January 18 and January 19 for a meeting, so just let me know what time works for everyone.

Do you have any more information on the timeline for the tests? Particularly, is there a time frame that we're expecting mirrors at JLab that need to be tested?
If there is some time constraint, please let us know so we can work the task into our schedule.

Thanks!

-Tyler




________________________________
From: Wenliang Li <wenliang.b.li at gmail.com>
Sent: Saturday, January 6, 2024 9:12 AM
To: Anselm Vossen, Ph.D. <anselm.vossen at duke.edu>; Tyler Lemon <tlemon at jlab.org>
Cc: dsg-internal <dsg-internal at jlab.org>; Zhiwen Zhao <zwzhao at jlab.org>; Matthew McEneaney <matthew.mceneaney at duke.edu>
Subject: [EXTERNAL] Re: October 10, 2023 UV reflectivity test station meeting minutes


Hi Tyler and all,

I completely agree with Anselm's suggestion.

I will be at JLab from the 18th -21st, if possible, we could have the coated samples double-checked by Tyler's setup during this time.

>From the reflectivity measurement that was performed in December, the best of the coated samples at SBU was around 70-75% reflective at 300 nm.  We are currently compiling a report documenting our findings which will be circulated to everyone shortly. We are currently taking steps in upgrading our coating capability for further improvements.

Many thanks

Bill

On 1/6/24 09:05, Anselm Vossen, Ph.D. wrote:

As I said, I am very interested to get my student involved (btw: We'll
also have a PD stationed at JLab starting in February, but I am not sure
 if he will get involved, maybe it makes sense...)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-reflectivity/attachments/20240108/d26131bc/attachment.html>