Definition: The pump power when the laser oscillation threshold is reached. The pumping threshold power of the laser refers to the pumping power when the laser threshold is satisfied. At this time, the loss in the laser resonator is equal to the small-signal gain. Similar threshold powers exist in other light sources, such as Raman lasers and optical parametric oscillators.
The main oscillator fiber amplifier (MOFA, MOPFA or fiber MOPA) is different from the main oscillator power amplifier (MOPA), which means that the power amplifier in the system is a fiber amplifier. The latter are usually high-power pumped cladding amplifiers, commonly produced using ytterbium-doped fibers.
The output power of the first fiber laser was only a few milliwatts. Recently, fiber lasers have developed rapidly, and high-power fiber amplifiers have been obtained. In particular, the output power of the amplifiers can reach tens of hundreds of watts, even in some single-mode fibers. on kilowatts. This is due to the large surface area to volume ratio of the fiber (to avoid excess heat) and the guided wave (waveguide) nature, which avoids the problem of thermo-optic effects at very high temperatures. Fiber laser technology is very competitive with other high-power solid-state lasers, thin-disk lasers, etc.
In most cases the emitted light from the laser is polarized. Usually linearly polarized, that is, the electric field oscillates in a specific direction perpendicular to the direction of propagation of the laser beam. Some lasers (eg, fiber lasers) do not produce linearly polarized light, but other stable polarization states, which can be converted to linearly polarized light using a suitable combination of waveplates. In the case of broadband radiation, and the polarization state is wavelength dependent, the above method cannot be used.
A superradiance light source (also known as an ASE light source) is a superradiance-based broadband light source (white light source). (It is often mistakenly called a superluminescent light source, which is based on a different phenomenon called superfluorescence.) Generally, a superluminescent light source contains a laser gain medium that is excited to radiate light and then amplified to emit light.
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