I am very new to lasers, and I am working with a friend who owns a 130w Sinjoe laser that takes 20. We are attempting to use the laser to cut wheat straw, the straws are 5 - 7mm in diameter, and they are cylinders with thin walls mostly made up of air. The problem with cutting these straws is finding a lense that is powerful enough to cut through them quickly but also doesn't char the ends. If anyone knows of a lens that could work well for this I would love to learn more about it.