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PostPosted: Sun Jul 14, 2019 11:42 am 
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Joined: Sat Mar 09, 2019 12:58 pm
Posts: 96
Hello everyone

Does anyone have experience with making DIY wave retarder plates for polarized light studies? I tried making one out of cellophane but it was not optically clear and deteriorates the image quality when placed between the specimen and analyzer; when placed between the polarizer and specimen it produces interesting interference effects but I don't think thats technically the same thing (effects of this device together with polarizer rotation attached below). Perhaps someone knows of a cheap and optically clear material that I can use (the cellophane I used was the kind that comes with microscopes slides).

Thanks
Wes


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PostPosted: Sun Jul 14, 2019 2:36 pm 
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Joined: Sat Jun 20, 2015 3:57 am
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Location: Houston, Texas
Wes,

I don't think optically clear "lamda plate" material that you can place above obejctives can be found cheaply. Unless you found a surplus eBay seller who knows nothing about his stuffs. I would jump on it before you, if there is one :twisted:

I used cheap cellophane "lamda plate" the cheap way, below sample and above polarizer, and like the esthetics. But that is only good for hobby use.


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PostPosted: Sun Jul 14, 2019 3:13 pm 
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Joined: Sat Mar 09, 2019 12:58 pm
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Yes I missed a new full lambda plate from Zeiss for $85.00, it was mislabeled in terms of its manufacturer (probably explaining the nice price) but I forgot the bidding deadline and I really regret it.


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PostPosted: Mon Jul 15, 2019 2:23 am 
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Joined: Thu Dec 15, 2016 6:32 am
Posts: 50
Try mica. It used to be the material of choice :-)

Cheers,
John


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PostPosted: Mon Jul 15, 2019 4:58 am 
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Joined: Sat Jul 22, 2017 10:13 pm
Posts: 5
Edmund optical has lambda plate plastic sheet available for about 15 bucks for a 2 inch square.


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PostPosted: Mon Jul 15, 2019 6:59 am 
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Joined: Sat Mar 09, 2019 12:58 pm
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abednego1995 wrote:
Try mica. It used to be the material of choice :-)

Cheers,
John

Microworldofgems wrote:
Edmund optical has lambda plate plastic sheet available for about 15 bucks for a 2 inch square.

Thank you John and Microworldofgems. These are great ideas!


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PostPosted: Mon Jul 15, 2019 2:50 pm 
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Joined: Sun Dec 25, 2016 9:11 am
Posts: 999
Hi Wes,
not tried for microscopy, but might be an idea: The plastic foil to wrap flowers in is optically very nice.
Another source may be screen protectors for cameras and smart phones and display windows of cameras and objective covers of smartphones.

It also is a big question whether you want a retarder of unspecified properties or something precise to use on a polarizing microscope = measuring device with added image option.
I'm sure that the original lambda plates have the right amount of retardation but I wouldn't bet on them supporting perfect image quality as this is not necessary for pol work.

Bob


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