The 81045 energy rejection mirror

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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TheSkyBurner
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The 81045 energy rejection mirror

Post by TheSkyBurner » Wed Jun 13, 2018 8:00 pm

Looks like a winner, specifically for calcium imaging with massive optics! So far i am getting a positive result, will report more as i get more info.
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TheSkyBurner
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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Wed Jun 13, 2018 8:11 pm

I have two of these now! one is already installed on the stage 4 xtruder. The mirror holder itself requires a slight modification to adapt 2” telescope components but is very simple. I will go over that later today since i have to adapt this second 81045 i was lucky enough to aquire for $170.
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TheSkyBurner
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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Wed Jun 13, 2018 8:17 pm

motion view of the pure blue reflecting ; infrared pass through rejection 81045 mirror..
pure blue reflective mirror IR rejection.GIF
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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Wed Jun 13, 2018 8:25 pm

This exact eyepiece holder fits perfectly flush with the male portion of the 66245 mirror mount, however you need to drill three or four holes to secure it permanently with small screws. ( i am sure other eyepeice holders will also work, but this is the one i know for a fact works well because i already have it installed and confirmed working)

https://www.ebay.com/itm/Astro-Optics-S ... 1063854906

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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Wed Jun 13, 2018 9:00 pm



The 81045 mirror is something close to 90% relective at 393nm so enjoy this valuable resource.


christian viladrich
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Re: The 81045 energy rejection mirror

Post by christian viladrich » Thu Jun 14, 2018 7:15 pm

Thanks for the information.
Any data on the transmission / reflection curve from 380 to 400 nm ?
Christian Viladrich
Co-author of "Astronomie Planétaire"
http://www.astroplanetes.com/

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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Thu Jun 14, 2018 9:01 pm

christian viladrich wrote:
Thu Jun 14, 2018 7:15 pm
Thanks for the information.
Any data on the transmission / reflection curve from 380 to 400 nm ?
I do not think oriel / newport has one. I have asked several times by email for the spectral plot but the person just keeps changing the subject. All they have provided me with so far was the above document.

You may get a better response out of them if you go on this link https://www.newport.com/p/81045 and waiit for the "live chat" window to pop up. I think newport is getting these mirror supplied from a third party and are not the actual company putting on the coating because they said they cannot change the specifications. (I asked if 20/10 polish was possible, and if other substrates were usable)

I will try locating another place to replicate the same mirror with much higher quality more suited to solar imagers and update the coating to also reject the 280-385 at right angles perpendicular to the output. So it will only produce a 380-400 image.

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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Thu Jun 14, 2018 9:06 pm

This would be quite an interesting modification to the secondary mirror on a newtonian reflector telescope,

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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Thu Jun 14, 2018 9:14 pm

I just contacted a 3rd party coating company, ill have an answer by monday about having this customized onto uv silica/quartz substrate, 20/10 scratch and dig with lambda 20. with reflective output at 375-430 so it may be used for G-band.

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Re: The 81045 energy rejection mirror

Post by TheSkyBurner » Fri Jun 15, 2018 10:41 pm

Now that I am actively learning about these beam splitters and how valuable they are for professional solar optical systems, I have been looking for different solutions.

Although the price is much greater, This one is very high quality and is specifically made for increased imaging performance. It will reflect K-line , h-line and g-band at 95%, and anything else below 500nm while passing everything beyond 525nm into the heat sink.

https://www.semrock.com/filterdetails.a ... 2-t3-25x36

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