Laser Diode Drivers
Fundamentally, a laser diode driver is that constant current source, linear, noiseless and accurate that will be used to deliver such precise quantities of current to a laser diode as is needed to perform a given function or for a specific application. Users will have the option of keeping the laser diode or the photodiode current constant or at wheel level. It is the control system that will drive the current to the laser safely and at the required degree.
By and large, the laser diode drivers happen to vary greatly in their set features and performance as well. Here are some of the basics to know of when it comes to the laser diode drivers.
We will first take a look at some of the facts and basics on laser diodes. Generally speaking, the laser diode drivers serve mainly to supply current to the laser diode. There are a number of uses that exist for the laser diode. Some of the most common applications to which the laser diodes are often seen being used are such as remote sensing, spectroscopy, medical diagnostic and analytical equipment, welding and material processing, particle sizing and counting and many other uses. In most applications, you will find it abbreviated as LD.
Talking of the laser diodes and drivers up there, we have already heard a thing on the photodiodes and these are the others that we will be taking a look at. There are some instances where a monitor photodiode may come as an integrated feature in the laser diode package. You will in most cases realize that the integrated monitor photodiode will produce current that is more or less same in amount to the output laser diode optical power. The one thing that needs to be as clear when it comes to the laser diode packages is that they really happen to differ a lot one from another and as well the photodiode transfer functions as well happen to differ as well in equal measure. They are indicated by the wavy arrows on the devices and are as well abbreviated PD.
The Feedback mode is the other essential feature of the laser diode drivers that needs to be known. Most of the laser drivers will always allow control based on either of the two currents, laser diode current or the photodiode current. Where you feed laser diode current as feedback, it is often the case that the control system will, as we had already hinted above, try to keep this unaltered. It is always the case at such times that the output of the Adjustable Current Source will not vary in the case where there is used the laser diode current as feedback.