Green laser pointer has the plug and play characteristics

The heat generated by the current will spread to the other side of the side of the TEC is "hot" side and "cold" side of the TEC, which is the heating and cooling principle of the TEC. Cooling or heating, and refrigeration, heating rate, to determine its current direction and size. In practical applications, the TEC is usually installed between the heat sink and component housings. Its cold side of the laser core contact, play a refrigeration role of the hot side heat sink contact, heat scattered to the outside, this is only one kind of the most common situation. Require a higher place on the stability of the laser operating temperature is generally a two-way thermostat at normal and high temperature of laser cooling. Here will present the performance introduction ofchina laser pointer
Heating at low temperatures; semiconductor cooling device in the direction of the current downturn, the location of the cold side and hot side interchangeable; is close to one of the laser core becomes hot end of the laser core heating. Specific temperature control circuit will be detailed later. Thermistor. Thermistor temperature components of the laser components, it is usually attached to the measure of the heat sink, direct detection of the temperature of the junction area. When the laser temperature rises, the thermistor resistance decreases when the laser temperature is lowered, the resistance of the thermistor increases. The thermistor play the role of the temperature sensor. Accuracy of its resistance changes as high as possible. Thermistor and semiconductor refrigeration with precise temperature control to complete the laser. The distance of remote control ofchina laser pointer is 15m.
Automatic temperature control circuit of the optical transmitter, the temperature of the laser can be controlled within the range of 25 ± 0.3 ° C, so the stability of the laser. The backlight detector. The light detectors are semiconductor devices of light signals into electrical signals, mounted above the heat sink, used to detect the back light of the laser to provide optical power monitoring, and for the laser automatic power control. Common photodetector PIN photodiode and avalanche diode, but is generally used in optical fiber CATV system PIN photodiode, the P-type and N type semiconductor, among them a slight mix of intrinsic semiconductor material, also known as depletion layer. china laser pointer has the switch to stop the batteries from leaking.
Major carrier in the N-type semiconductor, electronic, and P-type semiconductor, the main carrier is a hole, due to the movement of the charge, the depletion layer on both sides of the accumulation of charge in the internal formation of a N region points to a self-built electric field of the P region to prevent the hole continues to spread. When the incident light irradiation to the PN junction, depletion layer, it will cause the electrons absorb the photon energy, the transition to the conduction band, the formation can be conductive electron-hole pairs. Electrons and holes generated by light irradiation called photo-carrier; the role of self-built electric field, directed movement, in which holes along the field direction of the P region movement, electronic reverse electric field direction N district sports (they form the electric field self-built electric field weakened) to form a photocurrent. china laser pointer has the double energy-saving control.
Incident light, the stronger the greater the photocurrent, which the optical signals into electrical signals, precisely because the photocurrent is enhanced with the enhancement of the incident if the incident light is too strong, so that the photocurrent increases to exceed the limits of PIN it will burn out the PIN diode and optical receiver manual clearly defines the upper limit of the input optical power, if you can not determine the optical power of the input light must not PIN docking to prevent burn out the PIN diode. If both ends of the PN junction with reverse voltage, the applied electric field direction and self-built electric field within the depletion layer, the easier the movement of light generated carriers to improve the intensity of the light detector of weak exploration. green laser pointer has the plug and play characteristics.