looking for some quality dichro,s

[flecom]

ya im also loosing asstons of green through my LW dichros :\

[buffo]

I've had good luck with the Edmund's dichros in my projector...

Adam

[laseralex]

Wow, I must have got lucky with the batch I had! I measured an average 99.7% reflection and 96% transmission for random polarization on the set I tested. It's good to know that they can't be relied upon for consistency.

[bridge]

thanks for reply.
it is well to know different lasers had different transmission using our dichroic.
First, from our test result, be honest, our 15mm sizes dichroic is better than our 25mm sizes dichroic. although design is the same, but result is some different, so if you can using 15mm dichroic, that will be better, if you 'd like, please tell us your sizes? we will improve our 25mm dichroic soon, after our improvement, we will choose about 5 People here to do test, of course, the reputation and buyed our before dichroic and not satisfy will first choose, thanks.
Second, as you know, lasers had different polarization rate, especially the transmission is affect by polarization, although before we caoting, we consider both polarization, but S polarization and P polarization transmission still different after cotating, as their dichroic is 45 degreen using. when you laser had abnormal loss, maybe you'd better do some polarization test. thanks!
Best regards!
Bridge

[edison]

Thanks for all the replies. My laserwave dichro,s are the 15mm ones. In the next projector we have chosen for the small copper dichromounts because with these ones we can move the dichro,s and the scanhead more to the front of the baseplate. Now its mounted 40mm from the front of the basplate and so the aluminium bar in the is kind of in the way. Only with 40 degrees scanangle but of course you want to have the maximum even if you don,t use it so much.

[mccarrot]

I have done some measurements on the blue dichro.

This test is done with a 350mW 658nm red laser. this laser is a dual red with PBS so it will be H and V polarisation.

I measure a transmission on passtrough of 85%
14% is bounced off the dichro, thats why I think the AR coating is not that good.

[dar303]

That sounds bad. I'll measure mine too some day soon, maybe they have to be "angle tuned" to show their best?
Or maybe your is a bad one, I'm sure more people would have noticed this?

[Laser Ben]

I have done some measurements on the blue dichro.

This test is done with a 350mW 658nm red laser. this laser is a dual red with PBS so it will be H and V polarisation.

I measure a transmission on passtrough of 85%
14% is bounced off the dichro, thats why I think the AR coating is not that good.

Glad to see the meter getting put to good use

[bridge]

Hi Maurice,
Thanks for your detail test result.
1) our design is using 45 degree, but as you know, maybe it will had a few angle departure when coating, if you not had good result, please change a few angle to see what happen? also consider your laser was H and V polarization, which will make more loss than only H or V polarization lasers
2) I advise you try only dichroic, that will give your more exact result, as you know, light pass or reflect after mirror, it will had some angle change, when not using mirror, you projector to scanner is 45 degree, after you using dichroic, maybe your inject angle to scanner is not 45 degree, the same after one dichroic reflect then to another dichroic, the inject angle maybe not 45 degree too. it is more easily do test only with one dichroic mirror, would you like do test with only one mirrors.
3) thanks for good job and reply, Laserwave is always welcome your guys job, that will hurry Laserwave do better and better, thanks!
Best regards!
Bridge

[mccarrot]

Hi Bridge ,thanks for your reply.

1. As you can see angle tuning will be very difficult for me in my current design, and also the designs of many others.

2. I agree with you it would be better to do a test without the scanners, but it does give you a rough indication about the losses. Also the 50mW out of the 375mW which bounces of the blue dichro is not affected by the galvo mirrors.

3. Thank you, I just wanted to make a independent report of the result I'm getting. In a few weeks time I will make a new test without the scanners, and will also use more different lasers and I will test the red dichro also.
I also have some dichros from another manufacturer I will add to the test.

I allready have done test with the red dichro and my green laser. But my green DPSS laser is not 100% stable so it will give some misreadings. thats also the reason I didn't post the results, to prevent misinterpretation.

I would be happy to test the "improved" version of the dichro's when they are available.