The Dichro comparisation thread

[mccarrot]

My measurement are done with a FieldmaxII with PM3 head.

For the green and the blue I used a extra good quality IR filter to filter out any left over IR.

The Red laser used is a dual setup of 1x 660nm LPC815 diode and 1x 655nm Sony SLD1239JL-54 combined with a laserwave combiner cube putting out 400mW with a 2,2mm beam 0,8mRad

The green laser used is a very stable 100mw 532nm green laser with only 300nW deviation.

The blue laser used is a 100mW 473nm CNI, this laser got a deviation of a few mW so these results are not that accurate.

Maurice

[tocket]

Interesting, it seems the laserwave dichros have not improved that much and those swisslas dichros are damn good. Were all tests at 45 degrees angle of incidence?

Btw, I think you got the signs mixed up for the blue dichro blue reflectance/transmittance. I'm guessing you meant to say >99% (more than).

[bridge]

Hi Tocket,
Maybe you had seen wrong, our dichroic is much improvement, especially transmission.
Of course, from Maccrrot test, our dichroic is not as well as Swisslas's dichroic, but you know prices is much different.
Best regards!
Bridge

[mccarrot]

Btw, I think you got the signs mixed up for the blue dichro blue reflectance/transmittance. I'm guessing you meant to say >99% (more than).

You are correct I have Updated the file.

The old laserwave dichro's got a transittance loss of arround 10%, so the new laserwave dichro's are a big improvement.

[greenalien]

McCarrot - thanks for a useful test.

Some idea on prices would be useful. As far as I can see from the Swisslas site, their 10mm x 20mm x 1mm dichroic filters (red and blue) are 63.48 Swiss Francs each, which is £38.50 (or 42.8 Euros, or $61.2) - this doesn't seem that expensive.

Also, there's no info on the wavelength ranges which these will pass or reflect - anyone have any more detailed info? (I know you tested them with 473 blue and 660/ 655 red, but how well do they perform with 445nm blue and 642 red?)

[tocket]

Hi Tocket,
Maybe you had seen wrong, our dichroic is much improvement, especially transmission.
Of course, from Maccrrot test, our dichroic is not as well as Swisslas's dichroic, but you know prices is much different.
Best regards!
Bridge

Oh, I see now... I was a little tired when I posted that. I was comparing the new dichros with Phil's without actually reading what it said as the name.

With laserwave's improved dichros the overall efficiency of an RGB system at these wavelengths is 95.5%. I guess you could calculate how much 4% higher output would cost you in lasers and perhaps that will justify the higher price of the swisslas dichro (with an overall efficiency of 98.4%).

[bridge]

Hi Tocket,
thanks for your reply.
yes, I doubt our reflect red test had some wrong, our dichroic should be better.
Thanks for Maccrrot had seen my threads and he will do retest our dichroic soon.
Hi Maccrrot,
The High reflection surface is much brightness than the AR face, also the high reflection surface had a obviouse coating circle mark, thanks!
Best regards!
Bridge

[tocket]

What I'm really waiting for are some reflection and transmission spectra. Ben? Alternatively , some values at 642 nm...

[vakuum]

thanks for your testing Maurice!

I think your results are very exactly because I measure the SwissLas Dichros with only about 0.3% differences then you.
So you can measure!! :-)


@greenalien

The price for the Swisslas Dichros is 59CHF (you have to take the Export price without VAT) this is higher then all other dichros, but if the efficience is 2times or 6times bether, I think the price is not the problem.

according the wavelengths: the dichros are made for: 405, 445, 473, 532, 642, 658nm
Highest efficiences are at: 445, 532, 642 because this are the most important wavelengths for us.
so and according this test you see that 473, and 658 (652)nm are very good too!

kind regards
SwissLas

[greenalien]

Vacuum - are the Swisslas dichros available in other sizes - the website only lists 10 x 20mm. At present, I'm using the laserwave 15mm diameter circular dichros from the original group buy in 2008, so already have mountings for these. If there were 15mm circular dichros available from Swisslas that would fit my mounts, I'd be very interested.

Highest efficiences are at: 445, 532, 642 because this are the most important wavelengths for us.

Me too!!