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What is the wavelength of the emitted laser by a carbon dioxide?

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What is the wavelength of the emitted laser by a carbon dioxide?

(a) 9.4 μm

(b) 10.6 μm

(c) 11.4 μm

(d) 12.5 μm

I have been asked this question in homework.

Enquiry is from Carbon Dioxide Laser and Semiconductor Laser in portion Laser of Engineering Physics II

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Right choice is (b) 10.6 μm

For explanation I would say: The radiations emitted in a CO2 laser has a wavelength of 10.6 μm. It is a four-level laser. The transition takes place between the different vibrational states of the molecule.

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