wavelength selected blue laser diodes

[atomd]

I'm looking for 441nm and 444nm diodes (at full power). Preferably looking for PLTB450B and GH04C01A2G but I'm open for offers.

[kecked]

Just grab any 445nm diode and temp control it. Playing with Py. Doped fiber?

[atomd]

445nm diodes can be as much as +-10nm off and they tune by 0.2nm/K. I'll kill most diodes before I move them to peak absorption

[kecked]

445nm diodes can be as much as +-10nm off and they tune by 0.2nm/K. I'll kill most diodes before I move them to peak absorption

I think you can use a grating to tune them as external cavity in some cases. I usually have so much extra power I don’t care and just temp tune. My stuff doesn’t need power.

[buffo]

445nm diodes can be as much as +-10nm off and they tune by 0.2nm/K. I'll kill most diodes before I move them to peak absorption

I think you are underestimating just how robust modern blue diodes are. In comparison, Erick Meyers (Planters) was cooling red diodes (which are far more fragile) with liquid nitrogen back in the day to get orange out of them. That's a temperature drop of over 200 Kelvin compared to room temperature, and his diodes survived just fine.

Even if you needed to shift the wavelength of a blue diode by 10 nm, that would only require a 50 Kelvin drop, which is quite achievable with a large peltier with a proper heat sink and very good insulation of the cold side. (The insulation is important both to maintain the cold temperature and to prevent condensation on the diode connections.)

With some careful selection of the diode beforehand, I think you'll be able to find a 445 nm diode that is within a few nm of 445, which only reduces the cooling you'll need.

More importantly, if you slave the temperature controller to a spectrometer, you should be able to control the output wavelength with great precision.

Adam

[atomd]

Guys, I think you underestimate my requirements. I want 10 to 20x 2W diodes, running at near full power. Building even 10 ECDLs takes an absurd amount of space and costs a ton of money. I can individually pull every one with maybe +-15K, but that still requires diodes reasonably close. To hand select them I'd need to buy a ton of diodes and select a few (especially for 441).

[buffo]

Keep in mind that there are plenty of blue diodes that can exceed 2 watts of output. The Nichia NUBM44 is rated for 6 watts, for example, although it's baseline output wavelength is 450 nm, not 445.

I suggest you reach out to Zach Collins (laserman121 here on the forum). He seems to have a knack for locating hard-to-find diodes that lase at uncommon wavelengths. It's possible he might be able to suggest a source for the 441 nm diodes you're looking for.

Adam

[atomd]

Keep in mind that there are plenty of blue diodes that can exceed 2 watts of output. The Nichia NUBM44 is rated for 6 watts, for example, although it's baseline output wavelength is 450 nm, not 445.

I suggest you reach out to Zach Collins (laserman121 here on the forum). He seems to have a knack for locating hard-to-find diodes that lase at uncommon wavelengths. It's possible he might be able to suggest a source for the 441 nm diodes you're looking for.

Adam

The problem is beam quality. I want to knife edge multiple low power diodes to get higher quality beam than form single, higher power unit.

[Eu1eOne]

You could also reach out to Phritzler

[Laser57]

Lasertack in Germany was binning 2 W blue laser diodes at 444 nm, but expensive!!! I don't know if he has any left now though.