Measure beam profiles?

[mccarrot]

Is a beam profiler useful if you use DPSS lasers only?

Now I only tune with a powermeter and I scan a frame to check the noise.

[mixedgas]

thanks! I never thought about graphite, I'll have a look at some suppliers to find what cost a graphite rod I could machine to get a pot

Arc welders using a H2 assist some times used big graphite rod and they are cheap. That's how I got mine as a kid. Good welding stores sell them by the piece, not the box. Of course having never been to a welding store in Europe, I have no idea how it goes there. 1/2" ones make great crucibles and you can drill them with a drill bit (outside of course, maybe keep wet) If you have never handled finely powdered graphite, well, your in for a shock. They are quite tough, but the dust from cutting/drilling is a learning experience.


here ya go: http://www.engineersedge.com/materia...uging_rods.htm
Steve

[shrad]

thanks Steve!

I think I'll have a look for real crucibles in my area and design my heater coil around the one I'll buy...

I've always wanted a small aluminium and copper crucible, so I think I'll go for something a little bigger

thanks for the tip anyway, you decided me by showing some more thing are possible with a little multifunction furnace, and that's definitely something I want to try

since my mother has a ceramist formation, she'll also be able to teach me how to easily mold some small aluminium and copper pieces with relative precision

[mccarrot]

If you guys need PAL b/w 1/3" CCD camera's, I have some I'm willing to trade for laser goodies

Does it make sense to use a beam profiler for DPSS tuning?

[mccarrot]

I just made a beginning of a DIY beamprofiler.

I have a Watec CCIR camera with 795 (H) x 596 (V) pixels connected to a usb frame grabber set at 640x480 capture mode.
On the PC I have VbeamAcedemic running.
The software looks nice.

But now I think I need a ND filter in front of the CCD to attenuate the beam.

Do you have any tips what to use for attenuator?

[mixedgas]

Do you have any tips what to use for attenuator?
[/QUOTE]

I have a ND wheel, but they are expensive. may I suggest crossed polarizers or picking the beam off with ar coated glass or a microscope slide (slides)

Steve

[shrad]

if you have a polarized beam, you might also use a polarization filter and rotate it until you have a decent attenuation

I have one of 2" of diameter and 1/6" of width, and when rotated in front of an evenly polarized beam, it gors from 98% to approx 1% or 2%

I don't know if it can affect the readings, though

[mccarrot]

Is it necessary to have a adjustable Digitial shutter on the camera?

I have 3 different B/W ccd camera's
one with no digital shutter
one with a automitical digital shutter
and one with manual digital shutter.

which camera can I use best?

[mixedgas]

Is it necessary to have a adjustable Digitial shutter on the camera?

I have 3 different B/W ccd camera's
one with no digital shutter
one with a automitical digital shutter
and one with manual digital shutter.

which camera can I use best?

MANUAL IS BEST, all will work with good beam attenuation.

Just watch out for cameras with auto Gamma, or ones that cannot be set to AGC off. You will have to try each camera. Hint, use a low power or dying hene for tests

Steve

[shrad]

some CCD sensors have a pin to be grounded to disable AGC, if info is found in the datasheet...