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Gas lasers
Gas Lasers A gas laser is a device that emits and emits light through a gas at specific wavelengths. The gas atoms or molecules are excited to higher energy...
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Gas Lasers A gas laser is a device that emits and emits light through a gas at specific wavelengths. The gas atoms or molecules are excited to higher energy...
Gas Lasers
A gas laser is a device that emits and emits light through a gas at specific wavelengths. The gas atoms or molecules are excited to higher energy levels, and then spontaneously return to their ground state, emitting photons of light along the way. These stimulated transitions are driven by an external energy source, typically a flash lamp.
Key characteristics of gas lasers include:
Emission spectrum: Gas lasers emit light at specific wavelengths, depending on the gas used. The color of the light emitted is related to the energy difference between the excited and ground states of the gas atoms.
Gain medium: The gas is confined and excited in a discharge or by another means. This gain medium allows the excited atoms or molecules to interact with each other and emit light.
Threshold frequency: The threshold frequency is the minimum frequency of light that can be emitted by the gas. Any light with frequency higher than the threshold frequency can excite the atoms or molecules and cause them to emit light.
Applications of gas lasers include:
Communication: Gas lasers are used in communication systems to transmit data and voice signals over long distances.
Medical diagnostics: Gas lasers are used in medical diagnostics to detect diseases and monitor patient conditions.
Industrial manufacturing: Gas lasers are used in industrial applications for welding, cutting, and material processing.
Examples:
Helium-neon gas laser, which emits green light.
Helium-cadmium vapor laser, which emits red light.
Excited alkali atoms in a discharge tube, which emit light in the red and infrared regions