Why can my dog see laser pointer?
The 20mW purple high powered laser pointer emits purple light and has a star-shaped head that projects a unique design onto the target surface. The device has a built-in clip to aid wearing, but the patterned tip limits its usefulness in most situations. This high-power laser designator delivers 20 milliwatts (mW) of power and limits its range of sale. In many areas, consumer laser intensity is limited to 5 milliwatts or less, mainly for safety reasons. The laser designator overcomes this limitation because it produces a much stronger beam than many consumer models. Purple beams can reach distances of more than 200 meters.
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However, Heisenberg's uncertainty principle forbids pulses that are too short for a single-mode laser. However, you need to generate pulses of less than 100 FS, or a millionth of a second. Therefore, laser designator crow materials that can emit light in a very wide band (spectral width of tens of nanometers) are selected and the cavity is constructed so that the laser effect can be achieved in the whole wavelength range, i.e., multi-mode. All of these patterns need to be synchronized. Only when they are all fired at the same time is the transmitted pulse shortened. However, each of them is randomly synchronized according to the spontaneous radiation that produced it. To solve this problem, a "saturation absorber" was added to the cavity. This is when the pattern is distributed over time and opaque at low light intensity, but through the strongest, i.e. when the pattern occurs. It happens at the same time.
2021-12-02 12:27:14
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