100-800 mw of blue ray 405 nm single mode laser diode output is one nasty stinger, it is sharp, you have that, and although not high power compared to a NUBM44 seven watt 450 nm diode, will burn a very tight hole in things very quickly. The reason 405 nm burns so well is its absorption within many materials (to heat them up well at that wavelength), is how small it can be focused, tiny short wavelengths can be focused into a much smaller spot, just due to the size of the wavelength alone.
Also, the single mode laser diodes used at 405 nm can be focused into a much smaller tighter spot than multimode laser diodes (i.e. NUBM44) due to the simple tight beam geometry created from such a tiny emitter facet. Multimode diodes have a much broader larger emitter and correspondingly wide or broad beam shape on their output, and thus the output cannot have all of its energy as easily focused into as tight a spot to burn.
Of course, load up enough power at much longer wavelengths and they will blow through materials much faster than a 800 mw 405 nm single mode laser can due to what I will call brute force alone, the power density for a given area or spot size can be much higher with far more power too, even it it doesn't focus into as tiny a spot, but then you don't have the small high resolution burning capability of the shorter wavelengths which can be focused into such a tiny spot.
