Measurement of depth using laser

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I have to measure the depth of the cavity in an object which is in the micrometer(10^-6 m) order. I'm given a laser, mirrors, neutral density filters, photodiode, and the object which is to be measured. Can anyone suggest scientific articles that are related to this problem provided with the materials aforementioned?
As I was browsing the internet, I also found a few related articles like the light section method and measuring the width of a hair using interference patterns. However they didn't make use of ND filters.
 

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