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Title: Gaussian laser beam diameter measurement using a quadrant photodiode
Authors: Ng, T.W. 
Foo, S.L.
Tan, H.Y.
Issue Date: 2005
Citation: Ng, T.W., Foo, S.L., Tan, H.Y. (2005). Gaussian laser beam diameter measurement using a quadrant photodiode. Review of Scientific Instruments 76 (6) : -. ScholarBank@NUS Repository.
Abstract: Gaussian laser beam diameters are typically measured using knife-edges or gratings. Both require precise alignment with the photodiode placed after them from the laser source. In addition, beam diameter measurement in two orthogonal axes is only possible via rotation of the knife-edge or grating. Here, we report a novel measurement method that uses a relatively inexpensive and robust quadrant photodiode to circumvent the alignment requirement as well as allow two axes laser beam diameter measurement without rotation of any component. The theoretical basis of this approach is described and experimental results using it are presented. This method portends possibilities in the design of instrumentation that integrates Gaussian laser beam diameter measurement with laser beam tracking in a compact manner using fewer components. © 2005 American Institute of Physics.
Source Title: Review of Scientific Instruments
ISSN: 00346748
DOI: 10.1063/1.1928189
Appears in Collections:Staff Publications

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