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What is the operating wavelength of He-Ne laser?(a) 610.8 nm(b) 622.6 nm(c) 632.8 nm(d) 650 nmThis question was addressed to me during a job interview.My question is taken from PACS (Picture Archiving and Communication System) topic in section Telemedicine Technology of Biomedical Instrumentation

Answer»

Correct answer is (C) 632.8 nm

To ELABORATE: The He–Ne LASER operating at 632.8 nm WAVELENGTH is used. The laser output is coupled into the fibre using a converging lens, which results in an increased power density at the skin surface and thus enables the detection of flow in the more deeply seated veins and arteries.



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