What is metastable state in laser system?
Metastable state is an excited state of an atom or other system with a longer lifetime than the other excited states. However, it has a shorter lifetime than the stable ground state. Atoms in the metastable state remain excited for a considerable time in the order of 10-6 to 10-3.
Can laser be obtained without metastable state?
Can you obtain the laser without metastable state? Answer from the author: Yes, there are laser gain media which do not have metastable states.
What is metastable state explain?
metastable state, in physics and chemistry, particular excited state of an atom, nucleus, or other system that has a longer lifetime than the ordinary excited states and that generally has a shorter lifetime than the lowest, often stable, energy state, called the ground state.
What is metastable state discuss about it?
What is metastable state in lasing?
During metastable state, all the parameters associated with state hold stationary values. A large number of excited atoms are accumulated in the metastable state. The population of metastable state can exceed the population at a lower level thereby establishing population inversion in a lasing medium.
Do metastable levels exist in the laser gain media?
In general, metastable levels do not exist in the laser gain media. However, it is possible to use a short-lived level as the upper laser level in the presence of large emission cross sections. Metastable levels with long lifetimes allow storage of significant amount of energy, and hence they are critical for Q-switched lasers.
What is metastable equilibrium?
Ans: Metastable equilibrium definition states that state in which a system remains for a long period of time, and any small disturbance causing the system to deviate from the metastable state does not result in the system passing into another state.
What happens to atoms after the laser transition?
It also occurs that after the laser transition atoms are trapped in a metastable state (metastable ions). That is the case in helium-neon lasers, for example. Here, it is a good solution to use a laser bore tube with a considerably small diameter, so that the metastable atoms can dissipate (release) their energy in collisions with the tube wall.