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[norty303]

Got in. I invariably use a final steering mirror to bring the beam onto the galvos, and this usually means it comes in from above, which is also beneficial for other reasons.

[absolom7691]

Got in. I invariably use a final steering mirror to bring the beam onto the galvos, and this usually means it comes in from above, which is also beneficial for other reasons.

Normally, I would too but I am using the DI diodes from DTR so, I don't want to lose any of that precious power. Thanks for letting me know though.

[Pangolin]

... this usually means it comes in from above, which is also beneficial for other reasons.

AHA, good idea Norty!

By the way, don't forget about my idea to re-orient the laser so that the widest part of the beam is aligned with the widest part of the X mirror. This could be done using several mirrors to rotate the beam, or perhaps using a Dove Prism (or variety of optics that Fresnel invented centuries ago) or simply by actually rotating the entire laser itself (i.e. angling it up on an aluminum wedge or something like that). Alternatively you could simply decide to live with a little bit of over-fill as you mentioned in another thread.

Bill

[norty303]

It's too much messing to sort the beam orientation Bill, and more to go wrong/keep clean. I just got another 500mW out of the module anyway as I was under-driving it quite a way, so the losses don't really matter and the farfield spot is a nice size and shape. Tighter knife edge will sort the rest