15 minutes Splitbeam MBDCG Transmission Hologram

Kris Meerlo · Post by **Kris Meerlo** » Sun Feb 04, 2007 5:02 pm

- SP125 laser

- Exposure time 15 minutes

- Splitbeam

- Transmission

- MBDCG

- 25 degrees ( first bath )

There is a little movement.

Joe Farina · Post by **Joe Farina** » Sun Feb 04, 2007 6:22 pm

Interesting work, thanks for sharing it.

In my opinion, it should be possible to do such long exposures on MBDCG in the split-beam reflection format as well, if enough care is taken to stabilize the setup. What do you think, Kris?

My plans are to use stable objects and mounts, along with the shortest beam paths possible after the beamsplitter (using a highly diverging reference beam, and doing likewise for the object beam). Also using a table with minimal thermal expansion (granite), temperature and draft control, etc.

MarkCavin · Post by **MarkCavin** » Sun Feb 04, 2007 6:28 pm

It looks really nice; 15 minute split beam, thats impressive. Was this your first attempt?

glajciorz · Post by **glajciorz** » Mon Feb 05, 2007 12:13 pm

Congratulations Kris!

Will you make reflection copy of this holo ?

Will (or did) you try single-beam transmissions with MBDCG ?

What is the size of the hologram ?

greetings

Adam

Kris Meerlo · Post by **Kris Meerlo** » Mon Feb 05, 2007 6:13 pm

The sizes is 4 by 5 inch.

I made 4 exposures this one is the best the vibration was not a big problem the beamratio is very important I think 1:1 is the best for MBDCG.

I tried also a singlebeam transmission it looks also good but it is difficult to light the whole object.

Yes I think splitbeam reflection works also.