Abstract
We report on the implementation of a current drive modulation circuitry that is effective in suppressing speckle noise for laser diodes. The drive circuit allows for operating the laser diode current at constant dc or modulating the current with square or triangular wave signals. We theoretically investigate the speckle reduction factors that correspond to the different modes of operation. The theory predicts that triangular wave modulation gives the highest speckle reduction ratio. This means that when used as a projector, the laser should be fed with triangular modulated current for the most effective speckle suppression. We then verified the theoretical results by experimental measurements. We demonstrated effective speckle noise suppression by implementing a drive current modulator.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.