All on 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. You will then have the control system drive the current to the laser diode safely and as well at the required levels.
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. There are a number of uses that exist for the laser diode. These are such as where they are used for spectroscopy, medical diagnostics and analytical equipment, remote sensing, particle sizing and counting, welding and material processing to mention but some of the most common ones in a list of many others. This is often indicated in most application settings by the initials or short form, 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. It is at times the case that you will have your laser diode package coming integrated with the monitor photodiode. A monitor photodiode often produces a current that is in a way proportional 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. By and large, your laser diode drivers will only allow control based on the two current states which are the laser diode current state 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.