1. Operating material: the center of the red laser module, as long as the material that can complete the energy level transition can be used as the operating material of the red laser module.
2. Encouraging power: its effect is to give energy to the working material, and excite atoms from low energy levels to high energy levels of external energy. Generally, there can be light power, thermal power, electric power, chemical power, etc.
3. Optical resonant cavity: The first effect is to make the stimulated radiation of the working substance go on continuously; the second is to continuously accelerate the photons; the third is to restrain the direction of laser output. The minimalist optical resonant cavity is composed of two parallel mirrors placed at both ends of the HeNe red laser module. When some neon atoms undergo a transition between the two energy levels that have completed the population inversion, and radiate photons parallel to the direction of the red laser module, these photons will be reflected back and forth between the two mirrors, thus continuously causing The stimulated radiation quickly produces a properly powerful laser.
Infrared laser module
The pure light quality and stable spectrum declared by the red laser module can be used in many ways
Ruby laser: The first red laser module is that ruby is inspired by a bright bright light bulb, and the generated laser is a "pulse laser" rather than a continuous and stable beam. The quality of the speed of light generated by this red laser module is essentially different from the laser generated by the laser diode we are currently using. This kind of intense light emission that lasts only a few nanoseconds is very suitable for capturing simple moving objects, such as photographic holographic portraits of people. The first laser portrait was born in 1967. The ruby red laser module needs precious ruby and can only generate pulsed light for a short time. Increasing popularity of uvc chips
Helium-neon red laser module: two benefits: 1. Continuous laser output is generated; 2. Bright light bulbs are not required for light invigoration, but electricity is used to invigorate gas.
Laser diode: Laser diode is one of the most commonly used red laser modules at that time. The phenomenon of spontaneous recombination of electrons and holes on both sides of the PN junction of the diode to emit light is called spontaneous radiation. When the photon generated by spontaneous radiation passes through the semiconductor, once it passes the vicinity of the emitted electron-hole pair, it can encourage the two to recombine and generate new photons. This photon induces the excited carrier to recombine and announces the new The photon phenomenon is called stimulated emission.
Assuming that the injected current is large enough, the carrier distribution opposite to the thermal equilibrium will be formed, that is, the population inversion. When the carriers in the active layer are in many inversion conditions, a small number of photons generated by spontaneous radiation generate induced radiation due to the reciprocating reflection of the two ends of the resonator, forming a frequency-selective resonant positive feedback, or it may be said that it has a gain to a certain frequency. When the gain is greater than the absorption loss, the PN junction can declare the coherent light with the chromatographic line—laser. The invention of the laser diode allows the use of lasers to be sensitive and extensive. Various types of information scanning, optical fiber communication, laser ranging, lidar, laser discs, laser pointers, supermarket collections, etc., are constantly being developed and widely used.
