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What is the wavelength value of Ruby laser used in Laser beam machining?

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in Advanced Machining by (962k points)
What is the wavelength value of Ruby laser used in Laser beam machining?

(a) 633 nm

(b) 694 nm

(c) 856 nm

(d) 1064 nm

This question was addressed to me during an online interview.

This interesting question is from Laser Beam Machining-Introduction in portion Thermal Processes of Advanced Machining

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Correct answer is (b) 694 nm

To explain I would say: The value of wave length of Ruby laser used in Laser Beam machining is 694 nm.

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