Red and Blue diode options (RGB)

Hi All,

I'm looking at starting a simple RGB project.
Power ratio of 2.1.2 RGB i.e 400mw Red, 200mw green and 400mw blue approx.

Options are the Mitsubishi 300mW 635nm diode, a standard 200mw green module and a M140 running at low current (or A140).

My concern is matching the divergence, i think I can get away with the M140 divergence but the Mitsubishi will need some work to get all the beams to overlap satisfactorily.

Does anyone know of any orther options for the Red and blue theat will match the green laser beam diameter and divergence better in the 300 to 500mw range?

ATB
MM

You would get a much better blend of colours, and much better beam specs if you used a 110mW single mode 638nm diode, an Osram single mode for the blue, and 150mW for the green. The beams would be very close to the same size then, and it would be give much nicer white. You could even use 2x diodes for the red and blue with a PBS if you wanted, and still get great beams.

Alternatively you could use a 500mW mits diode, and crop the beam with piece of Al with a small hole drilled in it or use the 300mW mits diode and buy $$$ cylindrical correction optics or prisms.

Or you could use two LOC diodes with a PBS to get 500mW of 650nm.

Unfortunately there are not very many good (and cheap) options for higher powers of red for projectors or RGB lasers.

Hi Arg,

I seen the SM Osram 80mw group buy, but think 80mw won't be enough "umph". I did scan the thread to see what this diode will go up to without overstressing it - couldn't find a value though.

I like the idea of perhaps driving the red and the blue a bit higher and crop the beams.

I have an idea to reduce the fast axis of the red and if req' the blue, but that's just a bit of nuron noise in my head at the moment :thinking:...

Thanks for the help, plenty for me to chew on

Multimode said:

Hi Arg,

I seen the SM Osram 80mw group buy, but think 80mw won't be enough "umph". I did scan the thread to see what this diode will go up to without overstressing it - couldn't find a value though.

I like the idea of perhaps driving the red and the blue a bit higher and crop the beams.

I have an idea to reduce the fast axis of the red and if req' the blue, but that's just a bit of nuron noise in my head at the moment :thinking:...

Thanks for the help, plenty for me to chew on

Click to expand...

No problem Another option for the blue is to buy some cheap prisms made for correcting IR lasers. The losses will be high (35%ish) but you can drive the blue to 700mW and still get around 400mW out of it. It's less efficient, but if done right you can get a tiny beam with less than 1mrad divergence