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LaserShark Support / Re: TTL frequency
« Last post by f3nix on July 27, 2017, 04:32:03 PM »
I'm using this laser module:

The problem is that with lasershark_stdin_circlemaker the laser is very dim. It is visilbe from 5cm only.
I have checked with all three outputs.

With lasershark_jack and using playilda from openlase everything works as expected (full power and distance).

I do not know what is going on here.

I'm doing something wrong for sure since I've just started  :-[

Thanks for your patience.


LaserShark Support / Re: TTL frequency
« Last post by Macpod on July 23, 2017, 09:13:06 PM »
The LaserShark has two analog outputs and one TTL output. The outputs are updated once every time a sample is updated (which corresponds to the PPS rating you have choosen).

I have not heard of a laser requiring a particular frequency. Usually what you see is the maximum ttl frequency that they can be operated with. What laser are you working with?
LaserShark Support / TTL frequency
« Last post by f3nix on July 23, 2017, 12:04:44 PM »
Is it possible to make the TTL frequency higher?

My laser module needs about 1000khz.

LaserShark Support / Re: Lasershark board tuning
« Last post by f3nix on June 15, 2017, 01:43:29 AM »
Hello after a long break :)

I have almost finished soldering the board. Could you please share the calibration app?

Thanks! :)

LaserShark Support / Re: Adjusting output size with Openlase
« Last post by nicobux on March 25, 2017, 02:21:43 PM »
Great thank you!

edit: looks like I already had those connected. Is there a specific order I should be running the programs to get them to work? Maybe I'm just not using the output app correctly.

edit pt2: I just had to eliminate the jack connection from playidla to lasershark. Works now.
LaserShark Support / Re: Adjusting output size with Openlase
« Last post by Macpod on March 23, 2017, 09:48:43 PM »
libol and playilda app output plugs should be routed through the output app's input sockets in the patchbay of qjackctl. Doing this will cause all output from libol apps or playilda to be send to the output app. Once you do this you will be able to use the output app to control keystoning/size/power output/etc.
LaserShark Support / Adjusting output size with Openlase
« Last post by nicobux on March 23, 2017, 04:53:41 PM »

How do I go about using the output application to change the size of my playilda output? Not sure when to run it.

LaserShark Support / Re: Galvo distortion with Lasershark
« Last post by Macpod on March 23, 2017, 02:06:42 AM »
If you are just going to display a static image I would just tune to this and only after you determine the size of the image you want to display as well as the galvo speed (kpps setting). If you are using openlase, definitely tweak these params first. If they do not work, disable tweaks and then use the pots.

I cannot say I have a difinitive guide to tuning galvos and tuning will vary a little according to how many pots you have (higher quality galvos will have more adjustments). You might want to scan through the forums. In fact check that forum out regardless, there are some very knowledgeable folks over there :)

I would also reduce the complexity of this static image and ensure the paths are optimized. By this I mean I would reccomend drawing the shape in a manner that requires the galvos to perform the least drastic direction changes (i.e. if you are drawing a box, don't draw the left side, then the right side, then the top side and finally the bottom... draw the right side, bottom side, left side, top side).
LaserShark Support / Re: Galvo distortion with Lasershark
« Last post by nicobux on March 21, 2017, 12:49:01 PM »
Thanks for the informative reply.

The X and Y lines have three wires each.

Perhaps the issue is tuning. Do you have a link to any good tutorials? I have watched videos explaining the tuning process for the ILDA pattern, but I've been hesitant to touch the pots.

Do you recommend tuning exclusively to the ILDA pattern? Or would it be beneficial to tune to what I want to display (since I just need a static image).

LaserShark Support / Re: Galvo distortion with Lasershark
« Last post by Macpod on March 17, 2017, 09:05:42 PM »
It depends on where you buy them, I have seen sub 10kpps galvos  sold on ebay as 30kpps gavos.
You can spot these by their rectangular mirrors (mass limits quick changes in direction so generally faster galvos will have smaller mirrors and those with rounded/chopped corners).
You can also identify them by checking the wiring between the galvo amplifier and DAC (i.e. the lasershark). If the X and Y inputs only have two wires, the amplifiers aren't interpreting a bipolar differential signal which is important for position stability and to prevent distortion at higher frequencies.

Don't forget the ILDA test pattern is supposed to put a little stress on your system too.. otherwise it wouldn't be a very good test pattern :)

If your galvos aren't making terrible noises but you still see distortion it is possible your galvos are not tuned to be in harmony with OpenLase's default settings. Tuning can be performed in two spots...
1. The galvo amplifiers have a bunch of multi-turn pots which impact the galvo amplifier control loops.
2. If you look towards the top of some openlase executables you will see they have custom tuning attributes. playilda does not use custom settings, but the simple.c example does:

When you tune a system, remember that you are tuning it according to your current setup.. i.e. if you have adjusted the output size/keystoning/kpps rate in the output app, tune the ilda output, and then adjust the output size/keystone-ing again.. you will have to re-tune the system!
Also keep in mind that while you can get close, it is unlikely you will ever get a perfect ilda test pattern.
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