Index of Refraction: Range of Values?

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When plugged in, spatial light modulators (SLMs) alter the index of refraction to accommodate phase changes in the input light. The range of possible values for the index of refraction is determined by the shape changes of the liquid crystal molecules when an electric field is applied. For detailed information on how the index changes, consulting an electro-optics textbook is recommended.
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as far as i know, when plugged in, SLM 's change index of refraction to accommodate the phase changes happening to the input (light). Is there a range for the possible values of the index of refraction?
 
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you'll have to look in an electro-optics textbook for how the index changes. The index of refraction depends on the shape of the liquid crystal molecules changes when the electric field is applied.
 

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