Ushio OPTO SEMICONDUCTORS, Inc. - https://www.ushio.eu//en/index.html
Panasonic Aspherical Lenses - http://industrial.panasonic.com
Osram Laser Diodes - https://www.osram.com/os/products/product-promotions/laser-diodes/index.jsp
Sam's Laser FAQ - http://www.repairfaq.org/sam/lasersam.htm - Sam's Laser FAQ has a truly immense amount of practical information on a variety of laser related topics.
Laser Diode Source - https://www.laserdiodesource.com/SELECTION-GUIDE-All-Laser-Diodes - Selection Guide for laser diodes from all manufacturers.
RF Cafe - RF Cafe is a unique portal of RF, microwave, wireless, and other engineering resources.
Vast collection of equations, references and conversions for electrical,
mechanical, physical, and mathematical fields. Links for vendors, app
notes, test notes, ham radio, magazines, books, active forums, patent
and communications standards, technical crossword puzzles, quizzes,
and much more.
Laser Diode Selection - http://ldselection.com/
Opli.net - http://www.opli.net/
Findlight - findlight.net, Engineering marketplace connecting buyers with leading suppliers worldwide
All about circuits - http://www.allaboutcircuits.com/