Dichro replacement - laser readings

[andy_con]

thanks for the info gary

im off to PM rob about cleaning stuff now..........

[thesk8nmidget]

Hey Josh

Could you post some pictures of the mounts somewhere

Troy

heres a quick pic.



and i have 8 left

[sbk]

what brand laser would that be?

A very reputable manufacturer, I'll shut up the name for now to protect them until I have a discussion with him.

Wow, these 3-axis mounts are gigantic, I have the 2-axis version for 15mm dichro and it was really a nightmare to place and align them into my projector, I can't imagine these
But maybe the 25mm dichro aperture are helping...

[chad]

25 mm giant. I have a bunch of new focus mounts that are good to 10 mm.

You only need a tiny aperture. Anything else is just wasted space and wasted money.

chad

[carmangary]

As I mentioned above, I found that I can gain quite a bit more efficiency by reducing the reflected angle to less than 45 degrees. It will be hard to do that with a 10mm dichro because as you rotate it the window size for pass through decreases.

[allthatwhichis]

I have discovered something similar with dichro angles.

I took my projector apart to make room for a single Maxyz en-route from across the pond, and one of the 635/660 dichros. I noticed my eBay red/green dichro lost a lot of 660 (130mW TTL Maxyz) at all angles and when I swapped it out with the 15mm red/green from Bridge, I found that it has a sweet spot for reflecting green. I do not know the angle, but you can see the green transmit a small beam through the filter, and at one angle, little to no green gets through. I re-routed my green beam and changed the angle of that dichro.

I decided to rotate the angle of my Edmunds yellow/blue and found a spot where little to no green gets reflected as it transmits through it. I have yet to see any transmission of the blue on this filter, but it does reflect some red and green back back while transmting. I have just finished repositioning my blue so the angle of the yellow/blue dischro is at the sweet spot for transmitting green as I cannot find... or see, a change in red reflection. The green is dramatic; I had to be loosing 30 to 40% at that spot. You could see the waste beam go from semi bright to almost nothing as I turned the dichro, and it was only green. I wish I had a meter to document some measurements.

Here are some pics to show the difference in laser positions. Actually, the pics are BIG, so here are the links...

Here is the first positioninng in the projector, no mirrors, just straight into the dichros with the lasers height changed by "shims and heatsinks"...

This is basically the same theory, but I am using mirros to change the beam height, but it is a 90 degree to dichro type alignment.

Here is everything before I found out the custom red dichro would be pass 660 and reflect 635 and I assumed it was the other way around...

This is how it looks now... there is a mount for the dichro and that is the TTL Maxyz. I plan on using the mirror that the 635 is bouncing off of to align the 660 and move the 635 beam down to the mount that will be holding the "red" dichro.

There was an order before the last one when I found the green was reflecting off the blue dichro, the blue was the same as picture two and everything else was like picture three.

I think everyone may benifit from a little rethink of how thir lasers are layed out and what angles their dichros are at.

[thesk8nmidget]

i may be looking into this luckily i havent drilled any holes et for my lasers so i may be doing this setup as well but i might not have enough room.. well see