Question

Why electrical pumping is used for gas lasers?

Answer 1

the electrical pumping is used for gas lasers because the gas lasers are so dangerous in pumping

Answer 2

Hey.
Here is your answer.

Laser pumping or Electric glow discharge is common in gas lasers. For example, in the helium–neon laserthe electrons from the discharge collide with the helium atoms, exciting them. The excited helium atoms then collide with neon atoms, transferring energy. This allows an inverse population of neon atoms to build up.

Electric current is typically used to pump laser diodes and semiconductor crystal lasers (for example germanium).

Laser pumping is the act of energy transfer from an external source into the gain mediumof a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier. The pump power must be higher than the lasing threshold of the laser.

The pump energy is usually provided in the form of light or electric current, but more exotic sources have been used, such as chemical or nuclear reactions.

So, as Conventional light sources used for optical pumping have broad emission spectrum, so only a small part of the light is used in the excitation process. Because gas atoms absorb only a small portion of the spectrum, optical pumping is not generally an efficient method for gas lasers, so only electrical pumping is used here .

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