Blue laser wavelength small knowledge
A blue laser is a laser emitting electromagnetic radiation with a wavelength between 360 and 480 nanometers, which the human eye sees as blue or violet. The blue beam is produced by helium cadmium gas laser at 441.6 nm argon ion laser The blue beams of semiconductor lasers at 458 and 488 nm are usually based on gallium nitride (GaN; violet) or indium gallium nitride (usually true blue, but other colors can also be produced). Features of the blue laser pointer The wavelength of the light emitted by the blue laser pointer is 473nm, the laser type is Class IIIA, and it uses two AAA batteries. The brightness of the blue laser pointer is relatively objective, so it is more dangerous to the eyes. The higher the power, the more dangerous. Generally speaking, 5mw is commonly used, and the US market allows 5mw laser pointers, and more than 5mw requires special approval.
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The color of the blue laser pointer depends on the wavelength of the photon, which depends on the characteristics of the atoms or molecules that make up the gain medium. The most commonly used gain medium material for blue laser diodes is the crystalline semiconductor gallium nitride (GaN). Indium nitride (InN) and indium gallium nitride, an alloy of the two are also used. Like all laser pointers, the light of the blue laser pointer is generated by pumping energy into a semiconductor. In laser diodes, this is done by current, which distinguishes them from optically pumped semiconductor lasers that use light. This causes the energy level of electrons in the semiconductor material to rise briefly. When the electron returns to its original energy level again, the lost energy will be released in the form of photons, thereby producing light. Then, the light is collimated by the laser lens, and the generated photons are focused in one direction to produce a concentrated light beam.
2021-09-18 06:27:03
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