Abstract
Semiconductor Laser Diodes (LDs) are known for their sensitivity to variation in ambient temperature. With the rise in case temperature the threshold current of the LD increases, causing the output light power to deteriorate drastically. Therefore, it is necessary to stabilize the temperature of the diode. Various approaches could be adopted in this regard. In this paper, an active cooling approach using the temperature compensation technique has been followed and presented in the form of a full design of the circuit according to the various datasheet parameters of the LD and other components. As a result of temperature stabilization, a significant improvement in the output light power stabilization was observed and the results are presented.
Highlights
Laser Diodes (LDs) have been known for their sensitivity towards changes in the case temperature due to operation over long durations or to ambient temperature
With the change in temperature, their operating point keeps shifting, i.e. with the increase in the temperature it keeps shifting away from the original operating point which results in reduced levels of optical power output
A proposed remedy to these problems is a temperature compensating bias system, which is capable of keeping track of any changes in the ambient temperature and providing a higher safety to the LD
Summary
Abstract-Semiconductor Laser Diodes (LDs) are known for their sensitivity to variation in ambient temperature. With the rise in case temperature the threshold current of the LD increases, causing the output light power to deteriorate drastically. It is necessary to stabilize the temperature of the diode. Various approaches could be adopted in this regard. An active cooling approach using the temperature compensation technique has been followed and presented in the form of a full design of the circuit according to the various datasheet parameters of the LD and other components. As a result of temperature stabilization, a significant improvement in the output light power stabilization was observed and the results are presented
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