Electro-Optic Modulators (Lot of 4) TEC Cooled

Description

This auction is for a Lot of 4 Electro-Optic Modulators.
Unsure of what these exactly are, so please take a look at the pictures.
The modulator portion is inside a TEC cooled cavity, and temperature monitored by a 10K thermister.
Very interesting.  The crystal portion has wires on each side, and is roughly 1" x 1.5" and 3mm thick.
One side of the cavity has some sort of lens, and the other has a polarizer.  2 of the polarizers have de-laminated however.
You can repurpose the aluminum tec cooled cavity if you don't need the crystal portion.
Please take a look at the pictures.
Buyer to pay shipping.
Thanks for looking!