Hello! I have an issue with the power density of a 488 nm continuous wave laser. I'm using this laser to excite my sample. The problem is that even at low power, the laser is causing the samples to form a burn deposit on the quartz sample holder. Between the laser source and the sample, there are a series of dialectric mirrors, pinholes, and a focussing lens. What are the ways in which power density can be decreased at the focal point?