Search found 86 matches

by jrburns47
Wed May 13, 2020 10:49 pm
Forum: Gallery
Topic: Classic Holograms by Rich Rallison
Replies: 14
Views: 143

Re: Classic Holograms by Rich Rallison

Boxes of Millimask film...?
by jrburns47
Wed May 13, 2020 3:59 pm
Forum: Gallery
Topic: Classic Holograms by Rich Rallison
Replies: 14
Views: 143

Re: Classic Holograms by Rich Rallison

Thanks Bob,
I particularly like the Fu Dogs and the apparent wood base coloration. Pretty unique, especially for that period.
I still have a couple of Rich’s jars from the 74/75 period that we used to sell at the early MoH location at 120 W. 20th St in NYC.
by jrburns47
Mon Mar 23, 2020 1:19 pm
Forum: For Sale / Trade
Topic: Wanted: Heatsink for sapphire 488-100.
Replies: 0
Views: 461

Wanted: Heatsink for sapphire 488-100.

Hello all,
Looking for a used heatsink in working condition for a Coherent Sapphire 488-100.
Thanks.
by jrburns47
Wed Mar 18, 2020 10:44 am
Forum: General Holography
Topic: Newport 481-A: how to use???
Replies: 12
Views: 469

Re: Newport 481-A: how to use???

Once I tighten, top stage doesn’t move.
by jrburns47
Tue Mar 17, 2020 1:07 pm
Forum: General Holography
Topic: Newport 481-A: how to use???
Replies: 12
Views: 469

Re: Newport 481-A: how to use???

Thanks Bob. I’m using a nylon tipped 10-32 set screw.
by jrburns47
Mon Mar 16, 2020 11:34 am
Forum: General Holography
Topic: Newport 481-A: how to use???
Replies: 12
Views: 469

Re: Newport 481-A: how to use???

Thanks Joy. Yes, it does seem counterintuitive! Just tried it with the knob tightened & nada. The fine adjustment must be broken as you speculated. I can push the whole lower micrometer & knob portion a few degrees with my fingers and it snaps back to the right - it’s feels like a very tight spring....
by jrburns47
Mon Mar 16, 2020 8:35 am
Forum: General Holography
Topic: Newport 481-A: how to use???
Replies: 12
Views: 469

Re: Newport 481-A: how to use???

What is PB blaster?!
by jrburns47
Sun Mar 15, 2020 7:52 am
Forum: General Holography
Topic: Newport 481-A: how to use???
Replies: 12
Views: 469

Re: Newport 481-A: how to use???

The micrometer itself is working fine. Already took it out and checked it. Seems to be the “tangentially driven high resolution outerstage” controlled by the micrometer, that’s not doing it’s job.
by jrburns47
Sat Mar 14, 2020 8:59 pm
Forum: General Holography
Topic: Newport 481-A: how to use???
Replies: 12
Views: 469

Re: Newport 481-A: how to use???

No argument there. I adjust using a light meter & calibrated polarizer & it’s pretty clear where the optimum points are. Interestingly though, at $30, this 481-A is cheaper than most used eBay Thorlabs RSP1 & Newport RM25a rotators. Just frustrated that the micrometer seems to do nothing on this uni...
by jrburns47
Sat Mar 14, 2020 10:49 am
Forum: For Sale / Trade
Topic: FS: Several Coherent Sapphire Lasers - 3x488-20, 2x488-200, 1x530-300
Replies: 1
Views: 6910

Re: FS: Several Coherent Sapphire Lasers - 3x488-20, 2x488-200, 1x530-300

Looking for reliable heat sink for coherent sapphire 488-100.
Thanks