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What is the wavelength of light produced by He-Ne laser in laser inspection?

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in Engineering Metrology by (829k points)
What is the wavelength of light produced by He-Ne laser in laser inspection?

(a) 6988 Å

(b) 5328 Å

(c) 5928 Å

(d) 6328 Å

The question was asked in an internship interview.

This intriguing question comes from Laser Inspection topic in division Machine Vision Systems of Engineering Metrology

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The correct choice is (d) 6328 Å

The best explanation: He-Ne lasers are used in laser inspection. Light produced by He-Ne lasers is at a wavelength of 6328 Å  or 0.6 μm and that is in phase and coherent. This source is a 1000 times more intense than other monochromatic sources.

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