How to use high-intensity laser pointer correctly？
Laser power, i.e. laser energy density or laser power density. How laser power can be improved. There are two possibilities.Class I: Q-Switch technology.There are many methods to change the loss of laser pointer, such as rotating mirror Q, electrooptic Q, acoustic-optic Q, Saturated absorption Q and so on. As an example of the electrooptic Q circuit, the new devices in the laser pointer polarizer and electrooptic crystal are controlled periodically, to change the polarization direction regularly parallel or vertically to the original polarizer direction.polarization principle: If the polarizer is parallel, all light passes through; If the polarizer is orthogonal (i.e. vertical), the light is intercepted. If all light is intercepted, this means that the loss of the laser is very, very large. Q switching technology can usually increase the peak power by two sizes up to the size order of 10 ^6W (MW) (^ means power), and the pulse width is in the order of nanoseconds.
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The second clamping technique. If we have to improve the peak performance of the Laser pointer and shorten the pulse width, the Q switching technique cannot be realized. Then the closing technique appeared.Mode locking, also known as phase locking, as the name suggests, is Remember the principle of interference: if the electromagnetic wave (light) meets certain conditions: the phase difference (optical wavelength) remains unchanged and the direction of vibration is the same, Disturbances occur.When the phase difference between the length modes (i.e. frequency) of different lasers is locked, most of the energy focuses on the interference enhancement, This allows the pulse width to be compressed in the order of picosecond or even sub femtosecond, and the output can reach the order of 10^ 9W (GW).
2021-09-14 11:41:02
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