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If you can get the laser to produce a reflective surface within the groove it should work. The ideal tool is something conical with a very tiny radius at the tip, something like 0.002" so that there's a nice concave and self-polished surface within there. There are two sample/example G-codes generated from Holocraft that you could try. They are identical in terms of the hologram they produce but one uses strictly G1 feed commands while the other utilizes arc-feeds instead (someone was curious about the difference so I created these to show them).

Here's the links to the G-code produced: 

Hologram Segments

Hologram Arcs


Let me know if an SVG of the groove optics would be better than G-code for you to test out. I'd love to see what kind of results you can manage w/ a laser :)

(+1)

Yes, I would prefer an SVG. My laser can import vector files directly. It supports G-code, but I've never used that so I don't know how.

Alright, here's a re-creation of the other hologram that I linked to the G-code for. There's two versions, one that is made up of line-segments, and one that is made up using SVG's native cubic bezier curves.

Hologram Segments SVG

Hologram Curves SVG

Keep me posted!

Any discoveries to share creating specular holograms using a laser?

I tried clear acrylic, it didn't work... I'm not sure if black acrylic would work better, or if it's the same. But I was using extruded acrylic as it wouldn't frost to white when engraved, and I don't have any extruded black handy.