With the development of science and technology, laser technology has been used in many fields, such as national economy, national defense construction and so on. And it has wide applications in long-distance communications, digital signal storage and recovery, laser ranging, robotics, holographic application, medical diagnosis, etc.(more)

The maximum temperature difference of a single-stage thermoelectric cooler with a standard can reach about 72℃. Some TEC can be stacked together by using mechanical method: the cold side surface of one TEC is installed on the hot side surface of another TEC, so the maximum temperature difference can reach 130℃. This stacking is called the cascade or multi-stage cooler layout. In general, multi-stage cooler has the shape of Pyramid, and a high level volume of TEC is smaller than the low level volume. However, regardless of the shape and the size, the low level TEC need to have a greater cooling capacity than the high level TEC do. Although currently, we have the ability to manufacture more than six or seven level multi-stage TEC, we generally use the two to fourlevel layouts.(more)

c) In order to avoid TECs losing effect due to obvious mechanical vibration, do not place any large mass device without support on the cold end of TECs. When involving lass mass device, it's better to use chucking to fix the TECs between heat sinks and the object. Or place the device on a cold plate that can be media at first. At this time, damping screws can effectively increase the shear strength of the whole mechanical system.(more)

Thermistor is a kind of sensitive element. There are two kinds of thermistors based on different the temperature, which are PTC and NTC. It has a typical characteristic that it is sensitive on temperature. It shows different resistance value when it is under different temperature.(more)

In the system of optical communication, laser driver is an important part of an optical transmitter and it provides enough current to drive laser diode with direct modulation or enough voltage to drive electoral absorption device with indirect modulation.(more)

Thermistor is a kind of sensitive element, and according to the different temperature coefficients, thermistor can be divided into positive temperature coefficient thermistor (PTC thermistor) and negative temperature coefficient thermistor (NTC thermistor). The typical characteristic of the thermistor is sensitive to temperature, and different temperatures show different resistance values. At the higher temperature, the resistance value of PTC thermistor is larger, and NTC thermistor is lower, which belongs to the same semiconductor device.(more)

In the installation process, it's necessary to avoid wrong installation, which makes influence to the TEC modules. There are the following points that may affect the reliability of the TEC modules during the installation:(more)

The NTC thermistor is a thermistor with negative temperature coefficient and it has high performance ceramics near theoretical density structure by using a single high purity material. Therefore, at the same time with realizing miniaturization, it also has the small fluctuation characteristics of resistance value and temperature and fast response characteristic, which can take the high sensitivity and high accuracy detection.(more)

There are a lot of people worried about heating element working in the airtight space, and the working heating element produces heat continuously, making temperature of the airtight space increase, and shortening the lifetime of the element itself even damaged completely. Today I will introduce a cooling device (ATECA105) to help you solve this problem.(more)

Thermoelectric cooler (TEC) is based on “Peltier effect”, which can both cool and heat. According to changing the polarity of direct current, the same TEC can realize cooling or heating. This effect is achieved by the principle of thermoelectric. In principle, TEC just plays a role of a heat transfer tool.(more)