(Provisional) Group Buy: Laser Diodes A150V

[danielbriggs]

Hi, I ordered a A150 which should hopefully arrive on monday, I will let you know about the wavelength if I am able to measure a difference between it, and my A130.

Thanks! Very kind of you Sir.
I think Krazer had plans to do something similar too. The more data the better.
I'm sure as a community we can find out one way or another.

Which will be determined when?

Maybe not today, maybe not tomorrow, but soon.

[neutrino]

I'll be in for 4 of these if they are 460nm ish.
Cheers
Rich

[taggalucci]

Please count me in for 2 if 460nm

Thanks Dan

[Banthai]

Hi Dan

I will take 2 at that price .... even if they are not exactly 460 ...

im happy to take the risk ... just like you are doing by buying the projector ..... so no problems mate ...

count me in for 2

all the best buddy ....


Karl

[JohnYayas]

I doubt they are 460nm but if they are I'll take one if the beam is as good or better than the 445nm diodes.

[RedlumX]

Count me in for one if around 460nm, thanks!

[Phatslug]

Got the A150 today, that was fast.

Too bad I did not received my spectrometer as well. From the naked eyes view, there is no change in wavelength. The A150 is just brigther, but the tint of color is all the same, I would imagine a noticable change in tint if there would be a massive change in the blue wavelength. But thats not the case.

If anyone can think of any other test *without* removing the diode block, I am willing to do any poor mens test. If I will receive the prism based spectrometer the next cople of days, which I think it will, I will know for sure which blue wavelength is used.

If there is no change I will send the A150 back in return of my money.

Left, a150, Right a130.

[LaNeK779]

i don't know if i see what i see just because i want to see it, but the 150 looks not so deep a blue... which of course is good news. but then again, i am judging from a photo and from my hidden hopes for solid state near 473 light :0

better wait for the spectrometer's verdict then

[Stoney3K]

Got the A150 today, that was fast.

Too bad I did not received my spectrometer as well. From the naked eyes view, there is no change in wavelength. The A150 is just brigther, but the tint of color is all the same, I would imagine a noticable change in tint if there would be a massive change in the blue wavelength. But thats not the case.

If anyone can think of any other test *without* removing the diode block, I am willing to do any poor mens test. If I will receive the prism based spectrometer the next cople of days, which I think it will, I will know for sure which blue wavelength is used.

If there is no change I will send the A150 back in return of my money.

Left, a150, Right a130.

If you don't have a spectrometer, here's a good guess-timate:

Take a photo with both projectors projecting a FULL BLUE image, nothing else. Preferably shoot the photo straight from the front with the camera on a tripod.

Afterwards, open up Photoshop and try if you can find the 'histogram' or, even better, the chromaticity diagram for the photo. If the wavelength is different, there should be a noticable difference between the left and right-hand images. 460nm should have a different phase in chroma than 445.

(If the projector is only more powerful, only the magnitude will differ.)

To my video-trained eye, the left-hand A150 *does* seem to be more to a cyan tone than the A140.

[dnar]

Excuse my ignorance, but seeing as the LD in these projectors is only used as an illumination source to light phosphors, how do you figure judging the blue balance of the video output is in any way an indication of the LD wavelength?