What is a Laser Diode Driver
Generally speaking, the laser diode drivers are precisely constant current sources that are known for them being linear, noiseless and accurate as well and as such will be used to deliver just the required amount of current to the laser diode that it requires to perform a specific application. You can use the laser diode drivers either by choosing to use 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.
In actual sense, you will come to realize that laser diode drivers actually vary greatly in their feature sets and as well their 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. By and large, the laser diode drivers happen to serve the main purpose of supplying current to the laser diodes. As for the uses of the laser diodes, there are quite a number of the uses to which these can be put to. Talking of some of the most common applications that you will find the laser diodes put to include those such as remote sensing, medical diagnostic and analytical equipment, welding and material processing, particle sizing and counting and in spectroscopy in a whole list of other applications out there. 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. The photodiode will be indicated with wavy arrows shown entering the device and as well are abbreviated using the initials PD.
Talking of the other essential features that need to be known of when it comes to the laser diode drivers is that referred to as the Feedback Mode. In this regard, it should be noted that your laser diode drivers will in most cases allow control based on either laser diode current or 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.