Dichro comparison Laserwave VS Phil's

[mccarrot]

(235 + 50) > 272, so there is something wrong with your measurement setup (or those scanners are **Stupid** lossy)....

Regards, Dan.

Yes it the galvo mirrors. But they are the best cheap mirrors I could find.

These are the dielectric coated form lasershowparts (the same you find on the scanpro's)

Before I used the laserworld and laserwave mirrors but they are really lossy.

[mccarrot]

I have received improved dichros from Bridge (laserwave).

Here are some first test results.

Here are some first test result I measured with a stable 400mW 655nm dual setup combined with a pbs so H+V polarized.

(Please note the old dichro's are 1 year old and can be a little bit dirty, but they look clean)

Red no dichro = 400mW
Old reflect dichro = 372mW = 93% eff ( 7% loss)
New reflect dichro = 390mw = 97,5% eff ( 2,5% loss)

(this measurement was measured trough the galvo mirrors)

No reflect blue dichro = 312mW red
Old reflect blue dichro = 264 mW red = 84,6% eff (15,4% loss)
New reflect blue dichro = 303 mW red = 97,1% eff (2,9% loss)

[Carl B]

How about transmition of the Red through the Blue? and Green through both?

Carl

[vakuum]

@ Carl

he told it:

New reflect blue dichro = 303 mW red = 97,1% eff (2,9% loss)

Green is very difficult to measure.... I don't know if somebody has a absolute stable green laser to measure 1, 2 or 3% differences

[Carl B]

I just thought he may have given the Green ago anyway dispite the issue of stabbilaty.

Carl

[mccarrot]

Green is very difficult to measure.... I don't know if somebody has a absolute stable green laser to measure 1, 2 or 3% differences

I just received a new 160mW green lasers with a stability deviation of less than 0,4% after 2 minutes of warm up, so now I will be able to do pretty accurate tests on green.

Now I only need a stable blue

[-bart-]

You could also measure the wastebeam simultaneously with a second power meter.
Assuming the reflectivity and absorption is a constant, you can compensate for instability of the laser.
That way you can eliminate variation of the source out of the equation.

[mccarrot]

If you loan me your meter I can

[-bart-]

sure !
Please lengthen your message.

[mccarrot]

Here are some results from measurements I did with a stable green laser with an extra (good) IR filter in front of the laser.

blue dichroic transmission 532nm
Eff Loss
Laserwave new 96,4% 3,6%
Swisslas 97,9% 2,1%
Phils 96,2% 3,8%


red dichroic transmission 532nm
Eff Loss
Laserwave new 96,3% 3,7%
Swisslas 99,3% 0,6%
Phils 96,2% 3,8%