It is Here.!!!!! 300mW "635nm" Mitsubishi.....

DJNY said:

Beam correction optics.

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That for shure is obvious
I think i misinterpreted the smiley

^^the wings are realy awful..

Edit: But the often i look at the pictures the more i like it...looks kind of "strange"

Is it worth making a handheld anyway? Sooner or later the appropriate optics will be found, but it will be impossible to fit them in a module in order to fit a flashlight host. Fiddy, is it that bad is it looks?

Cyparagon found the optics already: PRECISION 12.7MM RIGHT ANGLE PRISM FACES AR COATED - Surplus Shed
I have also no idea how to fit it into a host

regalis said:

Cyparagon found the optics already: PRECISION 12.7MM RIGHT ANGLE PRISM FACES AR COATED - Surplus Shed
I have also no idea how to fit it into a host

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I thought he got them just yesterday. Did he already do a test?

as far as i know: yes, he used one prism of these.
Just searching for his post...mom
Edit: http://laserpointerforums.com/f52/rayfoss-mitsubishi-638nm-300mw-laser-diode-67381.html#post971475

regalis said:

as far as i know: yes, he used one prism of these.
Just searching for his post...mom
Edit: http://laserpointerforums.com/f52/rayfoss-mitsubishi-638nm-300mw-laser-diode-67381.html#post971475

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Oh, I missed that one.. :thanks:
Well we should wait for the final results if his test

Yeah i'm curious how nice the spot will look like with better optics.. :drool:

The prism works great, But it requires the diode to be on a different axis than the output beam. For handheld builds, you might want to go with cylinder lenses.

Silvershot said:

Is it worth making a handheld anyway? Sooner or later the appropriate optics will be found, but it will be impossible to fit them in a module in order to fit a flashlight host. Fiddy, is it that bad is it looks?

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it would be great if it was a nice round dot, the line or square isnt too bad tho and the 3 element glass lens cleans it up alot.

405-G-1


3 Element Glass


AR Coated Acrylic (not a good choice for 770mW )

Here are a few concept drawings I have done for possible beam correction. The host is a Guidesman 21. If Anamorphics will correct...I am not sure...I have a diode coming from DTR....and will experiment. Mechanically...it can be done....and have the beam on the center axis of the host to boot. Cost of the prisms is low. Thanx to DTR and Cy for their great work.

CDBEAM

CDBEAM777 said:

Here are a few concept drawings I have done for possible beam correction. The host is a Guidesman 21. If Anamorphics will correct...I am not sure...I have a diode coming from DTR....and will experiment. Mechanically...it can be done....and have the beam on the center axis of the host to boot. Cost of the prisms is low. Thanx to DTR and Cy for their great work.

CDBEAM

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The biggest problem in accomplishing a handheld build with these diodes would be to keep the prisms in place and somehow prevent them from moving, rather than the space required for them to fit. Very nice drawing. Would bare glue work to make them "sit" inside? Damn this seems very promising :bowdown: Did you use autocad?

SS...Yes...I used AutoCad. I am still a hacker at it compared to the full time user.....

There remain MANY questions to answer !! The most important of which being;
Do Anamorphic prisms correct the beam on this diode ??? Are they worth the trouble ??? At one time...I thought the 445LD needed them....( For scanner applications...it does )....but with a single O Like lens.....and in a pointer application....it looks perfect to me. No along comes this Photon Throwing Beast...which has very little heat managment issues !!! AND at the 635 line too boot !!! BUT....can the Anamorphics correct the slow axis and deliver a rectangle vs. a line ??? Dunno...I will find out !!! And what of transmission loss ??? Dunno....likely somewhere between 7 ~ 10 %

As far as construction of the prism holder....Acrylic + epoxy....then that module could be bolted to the heat sink ( See the two holes at .3" apart ). NO adjustment of the focus planned...although that MIGHT be possible ???

Could a smaller host be used ?? Sure...But I do not know if smaller APrisms are available ??? I have never seen them !!! They COULD be custom ordered...read $$$$...Possible only one prism could be needed....but I doubt it !!!

All this is speculation until we experiment and see what a set of APrisms will do.
My original post was just to illustrate that corrective optics could be done....and by offsetting the module....the optic could ALSO serve to bring the beam back in line with the host center axis.!!

Or maybe....as happened with the 445LD...a lens will be found that gives results that are acceptable in the pointer application. I will post with my results when I have info on the corrected beam geometry and associated losses.

CDBEAM:san: ( Christmas has come early )

Wolfman29 said:

This is getting intense! I'mma wait till I make my next laser sale (still waiting on the damn parts) but once I get that, I am going to dive into one of these diodes! Even know the perfect host for one of these things (C6 + DX stock driver = 900mA with an 18650!).

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I tested some DX drivers and a current of 831mA went throught the laser diode. The driver has no modification at all. Just connect the wires and it lase just fine. The driver must be connected to a powersource of 3.7V like a 18650 battery.

Yup! That's the one. But recently, a modified one of those (upped the current, changed out the SS) killed two 445s of mine

I always check the current with a dummy load before I hook any diodes. Just make sure that the current is within the range with no spikes. Final step is hooked the real laserdiode on to it. The driver in the photo is with SS14 printed on the component.

Another driver with SS34 gives me 700mA but this driver seems better build. 700mA is plenty enough. I am going to build this one in the C6 host.

***edit*** I also tested it with a 3-mode driver. It actually works.
Hi-mode delivers a 720mA current. Lo-mode delivers 94mA, the laser does lase at this low current. It seems odd.
And Strob-mode 400mA, the laser goes flashing on and off in high current. I like it
Bad news is that in Lo-mode the lab powersupply is still giving much current as it is in Hi-mode. Meaning all the power is lost into the driver.

I did check the dummy load - was giving me a constant 1.45A. But I think there may have been a 3.4A spike on start up, but I can't be sure - I don't have an oscope.