Semiconductor Laser Light Controller

- Sep 29, 2017 -

In recent years, with the rapid development of optoelectronic technology, lasers have been widely used in medical, defense, measurement and other fields. While the ambient temperature changes will directly affect the wavelength of the laser. The accuracy of the electronic system can be improved by limiting the temperature of the key components (such as high performance crystal, SAW filter, optical amplifier, laser diode) in a narrow range. Generally need to control the temperature within 0. 1 ℃, the laser's work accuracy can be well maintained within 0. 1nm.Laser Light

Semiconductor laser controller temperature detection, because the temperature of the laser quality has a great impact in the case of constant current, the temperature rise of 1 ℃, the laser wavelength will increase by about 0. 1nm, and the temperature is too high will lead to laser aging damage. Self-starting and overcurrent protection, thermoelectric cooler (thermoelectriccooler, TEC) voltage, current and temperature sensing. Abnormal working circuit is stopped to avoid damage to the laser components. It is worth noting that the effect of changes in ambient temperature on the laser requires the controller to have the capability of cooling and heating.Laser Light

Typically, the temperature of the element is kept constant by enclosing the element in a thermostatic bath at a fixed temperature. In order to provide some adjustment margin, the selected temperature should be higher than the ambient temperature under all conditions. This method has been widely used, especially in the design of ultra-stable clock (such as the thermostat control of the crystal).Laser Light

High temperature applications This method has the following drawbacks: performance (such as noise factor, speed and life) is reduced; ambient temperature in the middle range when the regulator consumes the power of heating, the ambient temperature at the low end needs twice the power; The time required to stabilize the temperature may be quite long.Laser Light

The temperature detection circuit is similar to the constant current source and uses a NTC (negative temperature coefficient) thermistor as a temperature detector. Which with the ceramic powder produced by the NTC components on the temperature of the small changes have the greatest resistance changes. In particular, some ceramic NTC has a stability of 0. 05 ° C in its lifetime (with proper aging). And the size of the ceramic NTC is particularly small compared to other temperature sensing. The thermistor is then connected in series to a constant current source, and the voltage across the thermistor is sampled to convert the temperature to an electrical signal.Laser Light


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