Search found 5 matches
- Fri Jan 01, 2016 10:25 pm
- Forum: Optics
- Topic: Rotating Polarization with Mirrors
- Replies: 37
- Views: 73619
Re: Rotating Polarization with Mirrors
Kate is right. It is the exact equivalent of the image John was referring to. Attached is better diagram. Wish I had SketchUp in the old days. ;-) For your info, the original diagram (pre personal computers) was programmed in Fortran, submitted to microfilm (35mm BW film), then printed on photo pap...
- Fri Jan 01, 2016 9:23 pm
- Forum: General Holography
- Topic: why there are some Black stripes on the hologram
- Replies: 6
- Views: 3449
Re: why there are some Black stripes on the hologram
Most laser diodes are prone to mode-hopping (or slight changes in wavelength) during a holographic exposure, but the effect is unpredictable. I always recommend helium-neon lasers for this reason. They are available at reasonable cost, on eBay for example. The way to be certain that those stripes a...
- Fri Jan 01, 2016 11:50 am
- Forum: General Holography
- Topic: why there are some Black stripes on the hologram
- Replies: 6
- Views: 3449
Re: why there are some Black stripes on the hologram
Black stripes in a hologram are often caused by a mode-hopping laser diode. These are also called "contour fringes" and cover the image of the object in regularly-spaced bright and dark contour stripes, making the object look like a zebra. Besides the parameter of the laser is MRL-III-671...
- Fri Jan 01, 2016 11:25 am
- Forum: General Holography
- Topic: why there are some Black stripes on the hologram
- Replies: 6
- Views: 3449
Re: why there are some Black stripes on the hologram
Black stripes in a hologram are often caused by a mode-hopping laser diode. These are also called "contour fringes" and cover the image of the object in regularly-spaced bright and dark contour stripes, making the object look like a zebra. Thanks for your answering! I know little about th...
- Fri Jan 01, 2016 10:25 am
- Forum: General Holography
- Topic: why there are some Black stripes on the hologram
- Replies: 6
- Views: 3449
why there are some Black stripes on the hologram
I am really interested in hologram and I did some experiences in laboratory. However, I don't know why there are some Black stripes which seems somewhat regular on my hologram. I tried many times but the black stripes still exist and i really hope anyone could help me figure it out. Thank you very m...