Modulation in BEYOND

[planters]

There does not seem to be any selection for modulation frequency in Beyond.
If I am using a DPSS 532 with a specification for analog modulation UP TO 10kHz along with direct diodes that operate with a driver good to 100kHz, how does the program determine the modulation frequency or avoid running beyond the operational limits of the slowest laser?
Furthermore, if I wanted to add a galvo blanked laser to the mix would I have to run everything TTL?

[gottaluvlasers]

I havent messed in beyond too much, so my answer may be kind of a moot (sp?) point.

What you need to do is color correction. Dave (DZ) and i think rob stanley (stanwax) and/or Andrew Briggs has color correction boards. In essence these do exactly what you are asking. I dont think there is a setting on the sfotware side to compensate for the different modulation different modulation speeds.

-Marc

[taggalucci]

I'm going to have a crack at this (shoot down in flames as appropriate)...

The software should not (to a large extent) need to concern itself with individual laser modulation speeds. My reasoning for this is that ultimately the signals are analogue when they leave the DAC. The individual lasers' drivers ability to respond to high resolution changes in voltage is what is being talked about here.

Someone told me once that when you think about point count and frame rate, resolutions higher than 10kHz are unlikely perceivable. I haven't done the math (I'm on a tram right now trying to hold on so it ain't going to be me right now)!

[LaNeK779]

Andrew Briggs has color correction boards

Three cheers for the birth of a new laser superhero!!!
imagine what we could get if we blended dr lava with sir daniel briggs
a few other interesting combinations also come to mind

sorry for the spam / off topic, i coudln't help it, back to my cave now

[-bart-]

...avoid running beyond the operational limits...

I might be just stating the obvious

Opposed to galvos, lasers can't really be damaged by a too high point-count. They just don't keep up, and smear out.
No harm in that.

Furthermore, if I wanted to add a galvo blanked laser to the mix would I have to run everything TTL?

Nothing keeps you from running other modules analog if one is ttl. Galvo blanking can be semi-analog, when done carefully.
On the other hand, Just be a man and AOM it !

[LaNeK779]

On the other hand, Just be a man and AOM it !

any ballpark estimate of parts needed and cost on this one?
it has been running across my mind and i've actively been trying to push it back...

[danielbriggs]

Three cheers for the birth of a new laser superhero!!!
imagine what we could get if we blended dr lava with sir daniel briggs
a few other interesting combinations also come to mind

sorry for the spam / off topic, i coudln't help it, back to my cave now

Hahaha! Brilliant.

[norty303]

The blanking modulation is dictated by the scan speed selected. The faster the scanning, the faster the modulation required. The actual amount of modulation will depend on the frame being displayed, but the FB3 (and iirc the QM) have an 'off' period for housekeeping every cycle. So even with a constant beam (e.g. circle) there will still be modulation going on. This is what lead to a lot of discussion previously about FB3 having poor output compared to CW, and was felt to be a result of poor modulation behaviour on cheaper lasers, rather than FB3 specifically.
There were many, many pages written at the time, a search for some of the keywords 'fb3', 'modulation', 'poor' should turn them up.

[norty303]

Try this one...

http://www.photonlexicon.com/forums/...oor+modulation

[-bart-]

any ballpark estimate of parts needed and cost on this one?

I got two of these.

Going price for a used aom-driver pair seems to be ~€200. I got my mounts for surplusshed for little (soldout now).