Journal
LASER PHYSICS LETTERS
Volume 17, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1612-202X/ab8a4f
Keywords
Goos-Hanchen shift; total internal reflection; Gaussian beam; spatial shift; weak measurement
Categories
Funding
- Technical Research Centre of S N Bose National Centre for Basic Sciences [All1/64/SNB/2014(C)]
- University Grant Commission (India)
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We report a detailed experimental demonstration of the Goos-Hanchen (GH) shift of light in total internal reflection condition for a Gaussian mode laser beam of 633 nm passing through an air-glass interface. The quantum weak measurement (QWM) technique has been exploited as a weak value amplification scheme to observe the amplified optical GH shift. The amplification of the GH shift depends on the angular deviation from the exact orthogonal position required for weak measurement. We have subsequently investigated the profiles of the beam pattern and their horizontal and vertical shifts in detail. We also show that the beam shift values obtained experimentally agree well with the theoretical results for a specific choice of angle of deviation from the orthogonal condition of weak measurement. Our results clearly demonstrate the advantages of the QWM technique for amplifying and detecting tiny optical beam shift effects and may provide important applications in precision metrology.
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