Part Number: DLPDLCR2000EVM
I have isolated the DMD and I am currently shining three wavelengths of light at it (red, green and blue). The RGB is aligned in the same light path, but the RGB are all reflected at different angles. Is there a way to change it such that all RGBs are reflected with the same angle?
Can you share what kind of optical setup you are using?
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In reply to Philippe Dollo:
Please see the link below.
In reply to Aaron Au:
How are you mounting the lasers? Do you have three different RGB lasers, or just one laser that is white?
The lasers are aligned via a laser combiner.
After hitting DMD the light scatters quite a bit... >
Note the scattering... and also that the green is centered, but the blue and red is in a diamond shape around it.
Apologies for late response.
You may be encountering the effects of the wavelengths of your lasers in this case. The wavelength of the incoming laser light can impact the reflection angle as per the diffraction grating equation:
You should note that D is the pitch of of the DMD mirrors, and m is the diffraction order.
I hope this helps.
Thanks for invesitgating this. Could you send the equation again?
I am unable to see the image.
Apologies for the broken image. See the equation on diffraction grating:
Thanks for that, it does look like a diffraction pattern.
My concern now is why I am only getting the "zero order" for the green. The violet, blue, and red lines seem to have no zero order in the reflection.
Apologies for the delay.
How have you aligned your lasers? Can you share any design information (such as drawings with exact measurements)?
Any updates on this issue? Feel free to reopen this thread if you have any more information to share.
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