Laser
Other Lasers
Here, it explains the laser of a new type.
Free Electron Laser
Lorentz force is caused in a free electron that moves in the magnetic field.
Therefore, the course of a free electron turns.
When bending, a free electron shoots monochromatic light in case of extremely high speed.
This phenomenon is called a synchrotron radiation.
A free electron laser is a laser using this synchrotron radiation.
The structure to arrange the magnetic field that turned oppositely mutually at equal intervals is called Wigler (cycle magnetic field).
Because the beam of a free electron is bent by the magnetic field, it moves meandering between Wigra.
The synchrotron radiation at this time oscillates in an optical resonator, and it becomes laser light.
The free electron laser is composed of the following three modules.
| Module | Function |
| Accelerator | It generates a high-speed electron beam. |
| Wigler (cycle magnetic field) | This gives the magnetic field to bend the electron beam and to generate the synchrotron radiation. |
| Optical resonator | It resonates the synchrotron radiation. |
The wavelength of a free electron laser depends on a cycle of Wigler and a relativism coefficient.
A relativism coefficient can be controlled by operating an electronic accelerator though it is not revokable because the cycle of Wigra is a peculiar size to the device.
It is because a relativism coefficient changes, when the speed of the electron changes, too.
This shows that the wavelength of a free lectronic laser is changeable.
Though it understands from this, A free electron laser needs neither the population inversion nor the stimulated emission.
A free electron laser must not be a LASER if back to the definition of the word of "Laser".
But, a free electron laser is classified as a laser in the character of the ray and the custom.
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