In the earlier articles, I have explained the modes and construction of carbon dioxide laser. Today I will explain the working of the carbon dioxide laser.
Pumping of nitrogen molecules: As electric discharge is used as pumping source and when electric discharge is passed through the mixture of CO2, N2 and He, electrons are accelerated down the tube. These accelerated electrons collide with the N2 molecules and excite them to higher vibrational energy levels. Let us say the N2 excited from level F1 to F2.
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In the previous article, I have explained the various modes of carbon dioxide and about the significance of these modes in carbon dioxide laser. Today I will discuss the construction of carbon dioxide laser.
Carbon dioxide laser consists of a discharge tube having a diameter of 2.5cm and a length of about 5m. The discharge tube is filled with a mixture of carbon dioxide, nitrogen and helium gases in the ratio of 1:2:3 with water vapors. Pressures maintained are about P (for He)= 7 Torr, P (for N2)= 1.2 Torr and P (for CO2 = 0.33 Torr).
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