Mitsubishi ML520G71...Red Holy Grail or Flashlight Fail ??

[planters]

As far as TECs, I have found that using two identical TECs and under driving the top works well and simplifies mounting. They act as simple resistors and so can be driven with simple voltage control unlike diodes. But, I do not think more than one stage is called for yet, as this surly will necessitate the Full Monty for deep cooling.
From the perspective of the diode, modulated use is only going to stretch out their time to failure, but the peak power won't change much because the junction reaches equilibrium (power in/heat out) so quickly.
I know. I've got a mountain like that too.

[steve-o]

Are the 500 mw P73s available again?

http://www.ebay.in/itm/ws/eBayISAPI....m=170690735344

[logsquared]

Are the 500 mw P73s available again?

http://www.ebay.in/itm/ws/eBayISAPI....m=170690735344

Is that the eBa y India site? Can't find it from the US site.

[DTR]

Are the 500 mw P73s available again?

http://www.ebay.in/itm/ws/eBayISAPI....m=170690735344

She told me January just a few days ago so I am not sure why she has them listed as available on eBay..

[logsquared]

Just got a different objective lens in the mail today. Results are good for those trying to match an o-like 445 with no correction. At aperature: ~4.5mm X 2.25mm and about 1.74 mRad. The pic compares the 100mm fl and 50mm fl spots at 35 feet. If a set of prisms are used after the tele the beam will completely fit on 3mm mirrors. Also, If a 2.75 - 3 mm Fl collimator is used the prism would not be necessary to get on 3mm mirrors.

[LaNeK779]

hey sir woody, nice results there!

there is also this thought that crosses my mind. we always measure the beam at apperture, like, after the last cyl lens. however, this beam has a spot, around 40-50cm away from the diode where the dot is actually round (where the fast axis and the slow axis have the same spot size, due to the one diverging much faster than the other etc etc etc).

It is not so difficult to arrange inside the projector so that this point of the beam (is it the beam waist?) is the point that hits the galvo mirrors. this should allow for a smaller apperture and no clipping from an otherwise fat beam

does this seem like a go?

[Doc]

hey sir woody, nice results there!

there is also this thought that crosses my mind. we always measure the beam at apperture, like, after the last cyl lens. however, this beam has a spot, around 40-50cm away from the diode where the dot is actually round (where the fast axis and the slow axis have the same spot size, due to the one diverging much faster than the other etc etc etc).

It is not so difficult to arrange inside the projector so that this point of the beam (is it the beam waist?) is the point that hits the galvo mirrors. this should allow for a smaller apperture and no clipping from an otherwise fat beam

does this seem like a go?

If you are getting a beam waist post correction then I think something is wrong somewhere (well, certainly *that* close)?

[LaNeK779]

If you are getting a beam waist post correction then I think something is wrong somewhere (well, certainly *that* close)?

that's the tricky part, i have only experimented with anamorphic prisms and even using three of them i never got the magnification i wanted (not blaming the prisms, they did their best!). so, maybe that's why i saw the waist thingy.

anyway, i have some cylinder lenses on the way, so i'll be able to check this more thoroughly. it makes sense as you say it doc, there should be no waist post correction, if correction has the proper magnification ratio

[steve-o]

Maybe not a waist, just where the FA=SA in terms of dimensions. Yeah I know the "spot" . It's usually 4-5 feet from the optics on my setups.
Oops I see you posted before I hit send on my post, Lanek. :]

[planters]

I found a property when looking at divergence with the 445 diodes. If you know the distance to your projection screen you can adjust the far field to a smaller size at that point than if you were to focus at a very distant target ie 100M with multiple retro reflections.
I don't know if identifying the point where x=y is of benefit because although the spot is round, both x and y are diverging and the area of the spot is increasing. If the plan is to use as much of the scanner as possible, to pack as much power on them or to maximize the near field beam and improve divergence, then placing the scanners as close to the lasers as practical should be the goal.