Some help identifying these?

[HD58PHD]

I have a few items here that came with some past Ebay auctions,hoping someone might know what they are,or at least some educated guesses.

No.1 is this lovely device from Coherent,it sports a BNC jack,a small knurled knob that appears to move something inside the housing,and was attached to a HeNe (possibly a GreNe) head when I got it.
Model 304 s/n 3153

And then this,
galvo looking thing with a mirror atop,2 wires,and doesn't appear to be made to rotate the mirror,any clues?
Mike

[Displaser]

The 304 should be an AOM (acousto-optic modulator). You'll still need a driver for this module - I've got the documentation on this archived somewhere...

[c4r0]

The 304 should be an AOM (acousto-optic modulator).

For me it looks rather like an EOM. I have a Coherent EOM that looks very similar, however it's bigger and has two BNCs.

[FourDee]

The second one looks like it could be a resonant scanner ...

[mixedgas]

B is a General Scanning inc. resonant scanner.

They have really sharp bandwidth, and very high q factors. Hook the coil to a audio amp at a few watts, bounce a hene or diode off the mirror, and freequency sweep it VERY SLOWLY with a sound card, but you can stop at around 4 khz. The coil can heat up fast, so keep the power down.

Or you could shock excite it and look at the coil with a sound card FFT (laptop microphone input) to get a clue where the first resonance is...
Steve

[Laserman532]

very cool paperweights

[HD58PHD]

All replies appreciated,and the winner is,,,Laserman! Paperweights,gotta love that one!
But anywho,what might a resonant scanner be used for? It's original intended use. It does look as if it had a purpose at some point,other than just to secure my bid! LOL!
Mike

[HD58PHD]

Oh,and as always Steve,you lost me after the first sentence. Pretty much.
And for my next item,also part of an Ebay treasure,(I had a bad habit of buying and hoarding Ebay stuff) is this,a collimator or expander,or paperweight maybe?

[Laser Ben]

Looks like something for a HeNe. The Red filter indicates that it is intended to block out the non lasing wavelengths.

[Laserman532]

Oh,and as always Steve,you lost me after the first sentence. Pretty much.
And for my next item,also part of an Ebay treasure,(I had a bad habit of buying and hoarding Ebay stuff) is this,a collimator or expander,or paperweight maybe?

that right there my friend it a VERY rare and hard to find thing-a-ma-jig