by gezzer » Wed Sep 02, 2015 4:35 am
hello, i want to start on hobby holography, read many materials and i've choosen the DIY way. i first want to make my own normal dichromate plates and pose them with blue/violet laser diodes(i know green laser diodes are not applicable due to their low coherent length caused by their working principle), if i can't find any applicable blue/violet laser diode, i'll then try shooting MB/TMG sensitized DCG plates with red laser diodes. i've choosen the DCG because i want to make holograms on different types of surfaces, like on a wine glass, on whole window, etc.
i've ordered some cheap bleu/violet laser diodes from ebay and want to check them if they are sufficently coherent for a beginner hologram. i've made a simple Michelson Interferometer with not so good optics and i don't know what to look at the interference pattern.
i've built it with first surface mirrors made from regular mirrors by removing the back coating, they have many tiny scratches on them, laser i've used has and under-the-average lens that cannot properly collimate beam at a single point, but seems fine to the naked eye, i've used an half silvered mirror i've obtained from a CD driver, for the imaging sensor i've removed the lens of my DSLR and simply put perpendicular to the beam instead of a screen.
i did the first test with a low power RED laser diode which has a great chance to be sufficiently coherent, but i cannot interpret the interference pattern. what differs between the interference pattern of a coherent and a non-cohorent laser beam?
below i supplied the interference patterns i've recorded, i'm seeking for your help.
- Attachments
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- two beams interfering together
- 1st and 2nd.JPG (569.66 KiB) Viewed 4474 times
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- second mirror beam
- 2nd.JPG (458.55 KiB) Viewed 4474 times
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- first mirror beam
- 1st.JPG (362.07 KiB) Viewed 4474 times
hello, i want to start on hobby holography, read many materials and i've choosen the DIY way. i first want to make my own normal dichromate plates and pose them with blue/violet laser diodes(i know green laser diodes are not applicable due to their low coherent length caused by their working principle), if i can't find any applicable blue/violet laser diode, i'll then try shooting MB/TMG sensitized DCG plates with red laser diodes. i've choosen the DCG because i want to make holograms on different types of surfaces, like on a wine glass, on whole window, etc.
i've ordered some cheap bleu/violet laser diodes from ebay and want to check them if they are sufficently coherent for a beginner hologram. i've made a simple Michelson Interferometer with not so good optics and i don't know what to look at the interference pattern.
i've built it with first surface mirrors made from regular mirrors by removing the back coating, they have many tiny scratches on them, laser i've used has and under-the-average lens that cannot properly collimate beam at a single point, but seems fine to the naked eye, i've used an half silvered mirror i've obtained from a CD driver, for the imaging sensor i've removed the lens of my DSLR and simply put perpendicular to the beam instead of a screen.
i did the first test with a low power RED laser diode which has a great chance to be sufficiently coherent, but i cannot interpret the interference pattern. what differs between the interference pattern of a coherent and a non-cohorent laser beam?
below i supplied the interference patterns i've recorded, i'm seeking for your help.