CNI 445nm Laser Module - Modulation Analogue or TTL

[simonb]

Hi everyone,

I'm about to buy a CNI Blue diode laser module (PGL-V-H-447/1-1000mW), but I'm not sure how the modulation works & wonder if you can help?

I'm told that its analogue & TTL. And the data sheet definitely says 'option'.

So I was thinking that there is a dedicated pin on which I would put say +5v for 100% intensity, +2.5 for 50% & 0v for off, with every point I between. Or TTL levels of +5v for on & 0v for off.

But I've just read the CNI data sheet, which says: "TTL/Analog 1Hz -5kHz, 1Hz-10kHz, 1Hz-30kHz & TTL".

Do I need to supply an up to 30kHz pulsed waveform to achieve modulation?

Is anyone familiar with this, or am I being particularly daft? (I have been subjected to enduring 2.5 hours of 'The Voice' on television!).

But I'm looking forward to ordering my laser this week!

Thanks all,

Simon B.

[JJWMACHINECO]

It looks the same as the Aixiz 1000mw 445nm.

http://www.ebay.com/itm/445nm-455nm-...item58ad3a9870

I have purchased 3 of these for laser engraving and returned two of them for replacements. None of them, even the replacements worked with analog or TTL modulation even though that is what was claimed. You notice in your link is states CW as operating mode. When you plug it in, it comes on full power. The only way I could get them to turn off, is to short out the modulation input connections.

I would not recommend them if your looking for analog modulation. I did use one of these for TTL engraving by pulse shorting out the MOD wires with dithered images.

There is a few I did with in Post #51 in this thread.

http://www.photonlexicon.com/forums/...ey-445nm/page3

[simonb]

Wow,

Thanks for your reply. I'm talking to Winni at the vendor (Golden Star Laser) about this before I buy.

Please can you tell me how you connected the MOD wires to get on/off full power? Thanks.

I've never even thought about engraving pictures on wood etc. how is it done? Presume a lens is needed to focus the laser modules (near) parallel 5mm beam into a tiny spot & something to accurately move the workpiece in 2 dimensions? Or does the workpiece remain still & you scan the laser with XY galvos, just like a laser show?

Also do you take a digital picture like jpeg/tif/bmp & convert it to XY movements?

I'd love to know how!

Thanks for your reply about the CNI laser, & for giving me something to think about.

Best wishes,

Simon.

[JJWMACHINECO]

Look through the pictures in the eBay listing and one of them shows a red and a black wire and it says analog modulation input.

Yes, I replaced the single lens in the Aixiz unit with a 3 element glass lens to get a smaller focal spot.

If you read through my thread I posted a link to, it explains how I am able to engrave with my LD's and it even has videos of my machines engraving.

Jeff