Jem's old RGB becomes my new RGB

**Doc** · 07-22-2009, 23:44

Originally Posted by Carl B

(

Who was the guy selling First Contact.

)

Carl

Not sure, I'm sure I've heard rumors that somebody on this forum knows somebody that might be able to track some down

**buffo** · 07-23-2009, 02:21

Originally Posted by gottaluvlasers

can a PBS be used to combine at different wavelengths?

Absolutely. However, if the two wavelengths are far apart your efficiency will suffer. But since 640 and 660 are very close, the losses are minimal.

You'd probably be better off with a dichro even so, but if you have a spare PBS cube laying around, why not use it, eh?

Adam

**gottaluvlasers** · 07-23-2009, 04:49

thanks adam!

just out of curiosity why are people still looking for these 650/635 dichros then for >$100? just use a PBS. whats the loss? mabe .5% more??

and who ever asked...Rob (stanwax) sells the first contact stuff! it works PEHENOMINALLY!!!! (SP?)

-Marc

**Jem** · 07-23-2009, 05:02

Originally Posted by gottaluvlasers

thanks adam!

just out of curiosity why are people still looking for these 650/635 dichros then for >$100? just use a PBS. whats the loss? mabe .5% more??

and who ever asked...Rob (stanwax) sells the first contact stuff! it works PEHENOMINALLY!!!! (SP?)

-Marc

It's because they were originally intended to be used with a dual Maxyzmodule, which of course has already used a PBS to combine the two opposite (s & p) polarised beams. This means that you cannot use another PBS to add the 640, therefore the only option in this case is to use the Semrock custom dichro.

However, if you are just using a single 660nm laser with p polarisation, this can be combined with a single 640nm laser with s polarisation using a broadband coated PBS.

Cheers

Jem

**danielbriggs** · 07-23-2009, 07:55

That's Looking super duper Carl

When is StanLEM 2

**Doc** · 07-23-2009, 09:35

^^^^^ Secondeded ^^^^^

**Carl B** · 07-23-2009, 09:59

Originally Posted by gottaluvlasers

hey carl-

how are you using the PBS here? I'm confused. are you using it to combine the 671 with the 640? is that possible? can a PBS be used to combine at different wavelengths?

beautiful though! i liked it with just the 671 in it at robs house. looks AMAZING with the 640 in there too!! excellent job!!

-Marc

As Adam mentioned above you can combine two different wavelengths with a PBS cube but it is costing me a bit of power from both Reds but the combined Red beam I am getting is giving me an almost perfect balanced white, well to me anyway.

Below is a photo of the new PBS mount fitted last night.
Attachment 8537

Originally Posted by danielbriggs

That's Looking super duper Carl

When is StanLEM 2

I say StanLEM2 should be a two day event this weekend.

**stanwax** · 07-23-2009, 11:08

I would agree but Im working on Sat night - and you cant hame Stanlem without the Stan

Rob

**Carl B** · 07-23-2009, 13:15

Hey Rob. What line of work are you up to on Sat night? Laser show by any chance? Do you need another RGB?

Carl

**Doc** · 07-23-2009, 14:41

The first rule of Stanclub; you never talk about Stanclub......

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