Combining 640nm and 660nm?

**Things** · 12-04-2009, 01:34

Hi, I am going to purchase a 200mW 640nm Laser-wave module.

This is a little low power for my green, but it's all my budget can stretch to.

I do however have a few LOC diodes in modules, and if needed, I can combine 1 with the laser-wave red? Will this work? What optic would I use?

Cheers,
Dan

**Jem** · 12-04-2009, 02:10

Originally Posted by Things

Hi, I am going to purchase a 200mW 640nm Laser-wave module.

This is a little low power for my green, but it's all my budget can stretch to.

I do however have a few LOC diodes in modules, and if needed, I can combine 1 with the laser-wave red? Will this work? What optic would I use?

Cheers,
Dan

Hi Dan

Provided the laser you are buying from Laserwave is a single diode module you can easily combine it with another red by using a PBS cube coated for red wavelengths.

You just need to find out what polarisation the laserwave has (s or p) and set your diode to the opposite polarisation.

Cheers

Jem

**MechEng3** · 12-04-2009, 02:47

Could he not employ one of the Semrock dichro's from the GB about a year ago? It was intended for combining 635 and 660. I have to locate the data sheet...... I would think that several LOC's and a opposed pair of 640's could be done nice. Maybe too much loss.....need to find the cut-off point on the data.

**andy_con** · 12-04-2009, 03:55

you could do with i did when i combined 660 with 635nm

i knifed edged the two 660 open can diodes and joined them in a standard laserwave cube with the 635nm beam.

check out my 1.8w RRGBV projector post

**Jem** · 12-04-2009, 04:54

The Semrock dichro could be used. However, it an expensive option.

I have a dual maxyz module combined with a Laserwave 642nm using the Semrock dichro.

I still think the cheapest way to combine two single lasers is with a PBS cube, providing the lasers are polarised of course

Jem

**Things** · 12-04-2009, 05:09

I'm not sure if the LW 200mW 640nm laser uses 1 or 2 diodes.

I'll buy it anyway, and see how it compares to my green. The 660 would just be a backup incase it wasn't standing up very well ...

Thanks

**Jem** · 12-04-2009, 07:03

The 660nm combined with the 642nm makes a beautiful red that packs punch.

You'll definately like it

Jem

**andy_con** · 12-04-2009, 07:51

**shrad** · 12-04-2009, 07:55

wow! aren't your beams a bit fat? according to the mirrors you use, you have a reducing setup right?

**andy_con** · 12-04-2009, 08:34

they are yes but theres nothing i can do about the size of the beam coming out of the 635

the two knife edged 660 beams fit easily inside the fat 635 beam

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