The principle and characteristics of point laser are introduced
Each laser has a basic structure in which an active medium (gas or semiconductor) is placed between two reflecting elements. This reflector causes light to travel back and forth through the same medium, causing resonance and storing energy. Since one of the two reflecting elements is a partial transmission mirror, laser light can be extracted from the mirror. This unique lamp can be used for a variety of purposes. Laser diode (LD) products are modular products that assemble optical systems such as collimating lens, line generator lens and drive circuit into laser emitting devices (diode devices). A product. For LD module products, the output is defined by the external output power, not the output of the diode component itself. That is, the maximum output through the optical system mounted on the LD module is standardized. Note that this maximum output is nominal and the actual value usually varies within ±10%. The intensity of the beam is gaussian, the maximum intensity is at the center of the beam, and the intensity decreases with the radial motion.
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Wavelength
Semiconductor laser is a kind of LED meeting the high power laser pointer oscillation condition, referred to as LD (Laser Diode). They have a lot in common, such as light due to current energy flowing through a semiconductor, and they can use almost the same circuit. However, because the light emitted by an LD is a laser, it does not change wavelength or amplitude in the same way that light emitted by an LED does. The light output direction is also different. Although the LED light has some diffusivity, the LD light is reciprocated many times in the resonator and is emitted as a thin beam. The protective laser has a wavelength range of 180nm to 1mm (1,000,000 nm) (CJIS C6802), but as shown in the image above, this range of light can cause eye damage. This part is different. In the cloaking region (up to 400 nanometers) and 1400 nanometers to 1 mm (1 million nanometers), most is absorbed by the corneal surface and some by the lens. It is said that use can damage tissue, the cornea can become inflamed (burned) in the short term, and long-term exposure to photochemistry may cause cataracts. Feeling dazzled and blinking as a defensive response. However, when the laser senses danger and begins a defensive response, there is a time limit of 0.25 seconds for the laser to enter the eye. In the meantime, an almost eye-safe laser will have an output of about lmW or less as a guide. At higher powers, the retina is said to suffer local damage due to heat and light collection, causing permanent damage.
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2021-10-27 11:56:04
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