the cost and expense of Laser Pointer

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. The customer will consider the cost and expense of Laser Pointer .
Require a higher place on the stability of the laser operating temperature is generally a two-way thermostat at normal and high temperature laser cooling, heating at low temperatures; semiconductor cooling device in the direction of the current reversal, the original cold end and hot end position on the exchange; close to one of the laser core becomes hot end, a heating core on the laser. 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. The material inquisition sheet of Laser Pointer should be filled in the right way. More management work should be done in the production month of Laser Pointer
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. 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. The parameter in the drawing of Laser Pointer has to be renewed as per the real situation.
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.