The Dichro comparisation thread

**mccarrot** · 01-07-2010, 18:10

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** · 01-07-2010, 19:26

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** · 01-07-2010, 23:50

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** · 01-08-2010, 03:57

Originally Posted by tocket

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** · 01-08-2010, 04:27

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** · 01-08-2010, 04:58

Originally Posted by 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

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** · 01-08-2010, 05:21

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** · 01-08-2010, 05:29

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

**vakuum** · 01-08-2010, 07:33

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** · 01-08-2010, 07:53

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!!

**vakuum** · 01-08-2010, 08:12

@greenalien

I have some with 1/2" diameter for standard mirrormounts, but no 15mm (I think only 1/2" and 1" is standard??)

but it is possible to glue the flat 20x10 mm dichro to each holder....

**greenalien** · 01-08-2010, 08:19

I'll have to do some measuring, to see how these might fit. I'll be dismantling my laser over the weekend to finally fit the scansafe board, so I'll do it then.

**mccarrot** · 01-08-2010, 08:36

Originally Posted by 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

Thank you for providing me those very nice dichroics!

Are you PBS also that good? I have now about 10% loss on my current pbs on passtrough.

**mccarrot** · 01-08-2010, 08:38

Originally Posted by 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.

Me too!!

I have used these mounts in one of the RGB's and I find these are much more stable compared to the lab style mounts.

**vakuum** · 01-08-2010, 08:49

Originally Posted by mccarrot

Are you PBS also that good? I have now about 10% loss on my current pbs on passtrough.

yes our SwissLas PBS are very good too! With our PBS you will have a total efficience of 98-99%

we have two kinds:
red: 640-660nm
blue: 445nm (not usable for 405nm)

we also have very good scanner-mirrors with 98-99.8% efficience from 400-670nm and a angle of 30-60° (this is for 60° scannangle)

**Roy G. Biv** · 01-08-2010, 12:18

Mccarrot:

Thanks for the test.

Vakuum:

I am also interested in your dichros if they are available in circular 1" sizes, that can fit my gimbal mounts. If you do, how much are they?

**greenalien** · 01-10-2010, 08:14

Vacuum - I have measured my existing dichros, and they are definitely 15mm, so 1/2 inch would be way too small. I like my existing, micro-adjust mounts and don't want to change them. Also gluing 10 x 20 mm dichros over the front wouldn't be satisfactory.

I would be interested in some 15mm circular ones, if you ever decide to make a batch I'm sure you'd find other takers!

**vakuum** · 01-11-2010, 03:22

@greenalien

sorry it makes no sense to make 100 pieces of 15mm filters for red AND blue dicros for perhaps 5 or 10 peoples who have this non standard 15mm holders

perhaps I will do 1" dicros because this is standard but no 15mm sorry.

If you don't want to glue them to your holder directly you can glue them on a 15mm diameter metal-ring...

**Doc** · 01-11-2010, 12:14

Originally Posted by vakuum

@greenalien

sorry it makes no sense to make 100 pieces of 15mm filters for red AND blue dicros for perhaps 5 or 10 peoples who have this non standard 15mm holders

perhaps I will do 1" dicros because this is standard but no 15mm sorry.

If you don't want to glue them to your holder directly you can glue them on a 15mm diameter metal-ring...

http://www.diy.com/diy/jsp/bq/nav.js...LAID=266879101

**mattydrac** · 01-13-2010, 01:47

I've just spotted something interesting whilst on the SwissLas website.

SwissLas address;
Pilgerstrasse 21
CH-5405 Baden-Dättwil
Switzerland

Laserworld address;
Laserworld AG
c/o SwissLas Braun & Güller
Pilgerstrasse 21
CH-5405 Baden-Dättwil

Can anyone shed any light on this strange commonality???

**vakuum** · 01-13-2010, 02:32

What strange commonality?

Laserworld is a customer of SwissLas. Nothing other!
SwissLas delivers the red and blue diode-lasermodule for they Purelight Laserseries and the OEM Modules.

**laseralex** · 01-23-2010, 23:53

Originally Posted by vakuum

yes our SwissLas PBS are very good too! With our PBS you will have a total efficience of 98-99%

we have two kinds:
red: 640-660nm
blue: 445nm (not usable for 405nm)

What size are these? I do not see them on your web site.

Thanks.

**vakuum** · 01-24-2010, 12:12

the PBS are 10x10x10mm

**MisterWilling** · 02-03-2010, 13:00

Are there any high efficiency dichros for blu-ray? I have one from laserwave but they are not very good at transmitting the other lasers through.

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