Joined: Fri Jun 25, 2010 10:06 pm Posts: 2267 Location: Chapel Hill, NC / Toronto, ON
Hey folks! I have an interesting synthetic find that I'll be bringing to Tucson. It's a giant slab of blue-purple YAG, obviously not Nd:YAG, that was grown in Russia by the horizontal floating zone method. It also happens to be dichromatic. Thinner pieces are obviously violet, but thicker pieces are rich blue with a hint of green. And it's not a zoning issue either - I checked.
Post subject: Re: Dichromatic (not dichroic) blue YAG
Posted: Mon Jan 23, 2017 4:13 pm
Gold Member
Joined: Mon Apr 16, 2007 12:05 am Posts: 1499
Faceting 101 by Arya wrote:
Thinner pieces are obviously violet, but thicker pieces are rich blue with a hint of green.
Seems like the usambara effect, but at the other end of the color spectrum, with material that transmits more violet than blue, while the eye is more sensitive to blue than violet. Cool.
Post subject: Re: Dichromatic (not dichroic) blue YAG
Posted: Mon Jan 23, 2017 8:06 pm
Moderator
Joined: Fri Jun 25, 2010 10:06 pm Posts: 2267 Location: Chapel Hill, NC / Toronto, ON
Brian wrote:
Seems like the usambara effect, but at the other end of the color spectrum, with material that transmits more violet than blue, while the eye is more sensitive to blue than violet. Cool.
Yup it's basically the Usambara effect, but instead of green => red, it's violet => blue.
Post subject: Re: Dichromatic (not dichroic) blue YAG
Posted: Tue Jan 24, 2017 8:23 pm
Moderator
Joined: Fri Jun 25, 2010 10:06 pm Posts: 2267 Location: Chapel Hill, NC / Toronto, ON
A) So, on further testing, it also has a colour shift. Usambara effect, AND colour shift. Interesting.
B) Shoot sorry Barbra, I forgot I'll mail you a piece once I saw it up. Wasn't really planning on selling any - were you just interested to see and/or test it, or did you want a piece for yourself?
Post subject: Re: Dichromatic (not dichroic) blue YAG
Posted: Tue Jan 24, 2017 9:07 pm
Site Admin
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
All of the above. I'd love to have a piece for my collection. I've always been captivated by the Usambara effect. For anyone needing a bit more information: http://www.nordskip.com/usambara.html
Post subject: Re: Dichromatic (not dichroic) blue YAG
Posted: Wed Jan 25, 2017 7:33 pm
Gold Member
Joined: Tue Jul 02, 2013 9:00 am Posts: 1322 Location: Wylie Texas but in Alaska for a while
Faceting 101 by Arya wrote:
A) So, on further testing, it also has a colour shift. Usambara effect, AND colour shift. Interesting.
B) Shoot sorry Barbra, I forgot I'll mail you a piece once I saw it up. Wasn't really planning on selling any - were you just interested to see and/or test it, or did you want a piece for yourself?
any chance for pictures? It sounds like very interesting stuff. If you cut any can youtell us how it polishes?
Post subject: Re: Dichromatic (not dichroic) blue YAG
Posted: Wed Jan 25, 2017 8:03 pm
Moderator
Joined: Fri Jun 25, 2010 10:06 pm Posts: 2267 Location: Chapel Hill, NC / Toronto, ON
wilsonintexas wrote:
any chance for pictures? It sounds like very interesting stuff. If you cut any can youtell us how it polishes?
I'll upload the video after my exams on Saturday. I took some video of the original piece, before I did the preliminary sawing. Will also take some good pics demonstrating the effect and post them too.
Users browsing this forum: No registered users and 5 guests
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum