CO2 laser is a type of

• Solid Laser

• Liquid Laser

• Molecular Gas Laser

• Semiconductor Laser

Pumping technique employed in gas laser is

• Optical pumping

• Electrical Discharge Method

• Direct conversion

• Chemical reaction

In gas lasers the output power is directly proportional to

• Diameter of quartz tube

• Brewster window

• Concave mirrors

• Length of the discharge tube

CO2 laser is a

• four level laser

• three level laser

• two level laser

• none of these

CO2 laser produces a light of the range of wavelength

• 50 $\mu$ m -24.8 $\mu$ m
  

• 10.6 $\mu$ m and 9.6 $\mu$ m

• 50 $\mu$ m and 20 $\mu$ m

• 10 nm and 50 nm

Power output of CO2 laser is

• 10 kW

• 10 W

• 10 microwatt

• 1 W

In which laser transition takes place between the different vibrational states of the molecule?

• Ruby laser

• Carbon di oxide laser

• Nd-YAG laser

• Semiconductor laser

In CO₂ LASER which mode of vibration, the oxygen atoms and carbon atom vibrate perpendicular to molecular axis?

• Symmetric stretching mode

• Asymmetric stretching mode

• Bending mode

• NONE

What is the use of He gas in CO₂ laser?

• to increase the population of atoms in the upper

  level of CO2

• to depopulate the atoms in the lower level of CO₂

• to depopulate the atoms in the lower level of CO₂

  and also to cool the discharge tube

• to increase power output

Which acts as active center in CO₂ laser?

• N₂

• He

• CO₂

• Ne