Picking up holography again after many years.
Picking up holography again after many years.
Set the angle of the reference beam to 54 degrees off the normal. Also, put a piece of black electrical tape over the leading edge of the plate during exposure to keep light from entering into the edge of the plate and causing noise on that end of the hologram.
Picking up holography again after many years.
Just to be sure, since English is not my native language, with 54 degrees of the normal, would that, for instance, be 54 degrees measured up from the horizontal?JohnFP wrote:Set the angle of the reference beam to 54 degrees off the normal. Also, put a piece of black electrical tape over the leading edge of the plate during exposure to keep light from entering into the edge of the plate and causing noise on that end of the hologram.
(btw would like to applaud you for your website, nice photos and nice pieces about DCG holograms, allthough that is miles away from my level)
Picking up holography again after many years.
Thank you you for the compliments.
Whoops, it should be 56 not 54, sorry about that misprint.
Check this site out.
http://en.wikipedia.org/wiki/Brewster's_angle
Whoops, it should be 56 not 54, sorry about that misprint.
Check this site out.
http://en.wikipedia.org/wiki/Brewster's_angle
Picking up holography again after many years.
I knew there was a name to that angle (obviously), couldn't remember it though.JohnFP wrote:Thank you you for the compliments.
Whoops, it should be 56 not 54, sorry about that misprint.
Check this site out.
http://en.wikipedia.org/wiki/Brewster's_angle
Assuming by your remark that it should be 56 instead of 54, is really comes down to one or two degree(s). Mmm, I need to make my makeshift setup a little more accurate But that's half the fun....
Picking up holography again after many years.
A degree or two does not matter but the closer you are the better.
Picking up holography again after many years.
To find the Brewster angle empirically, rotate the glass in the spread beam until the reflection from the glass surface is gone or at least minimized.
Picking up holography again after many years.
It just so happens 56 degrees is a very nice number.
90 degrees in half is 45.
45 degrees in half is 22.5
22.5 degrees in half is 11.25
11.25 degrees + 45 degrees is 56.25 degrees....darn close.
Where am i going with this. See below.
How to make a home made Brewsters Protractor.
90 degrees in half is 45.
45 degrees in half is 22.5
22.5 degrees in half is 11.25
11.25 degrees + 45 degrees is 56.25 degrees....darn close.
Where am i going with this. See below.
How to make a home made Brewsters Protractor.
Picking up holography again after many years.
nice, nice... and I was thinking a had to get the toolbox out of the shed to get the, whatever it is named in English, tool out which measures up angles, but this is even better.JohnFP wrote:It just so happens 56 degrees is a very nice number.
90 degrees in half is 45.
45 degrees in half is 22.5
22.5 degrees in half is 11.25
11.25 degrees + 45 degrees is 56.25 degrees....darn close.
Where am i going with this. See below.
How to make a home made Brewsters Protractor.
Picking up holography again after many years.
LOL, I have used this, a table saw mitre, a plastic protractor, the reflection statement made by Ed....
But while we are on the subject, I would really play with Ed's statememt. This is all mute if your laser is not polarized in the correct direction.
But while we are on the subject, I would really play with Ed's statememt. This is all mute if your laser is not polarized in the correct direction.