The TEA N2 Laser which was gifted to me by a friend several years ago has had my attention for the last couple of days.  I believe I have most of the components to make this work, right now I am just trying to understand how the circuit works and how it all wires together.  Most of the components seem to be in pretty good condition, but right now it’s just a wiring mess that I have to pull together.

TEA N2 Components w/o HV Supply

TEA N2 Components w/o HV Supply

Here’s a nice shot down the bore of the nitrogen laser, you can see the 4 screws which hold the front piece of acrylic to the bore, the screws protrude in fairly deep and then there is a piece of microscope cover glass or similar used as a window for the laser bore. I’m just guessing as to the material, but judging from the size, etc I would not be surprised if that is what they used.

TEA N2 Bore Shot 2

In order to better understand the design and operation of the TEA nitrogen laser I have been examining the circuit boards, driver circuits and laser design. I originally hand drew the schematic and then went over it, correcting it if needed. Once I did that work to reverse engineer the schematics I uploaded them into TinyCAD to produce digital versions of the schematics I could modify and relabel as needed.

This schematic may not be complete or 100% accurate, please do not assume it is a fully working circuit and always check your reference materials for the thyratrons and other equipment you are driving. This thyratron driver and TEA nitrogen laser schematic are provided for educational purposes only.

TEA N2 Partial Schematic v0.2

TEA N2 Partial Schematic v0.2

The pre-ionizers are a design I have not seen before in my web travels. The upper and lower electrodes are covered in some type of tape which is used as a dielectric. The pre-ionizer electrodes are etched from a copper board with some sort of dielectric material brushed on over the exposed section of the copper material. When the board is mounted to the electrode with the acrylic clip, it forms a capacitor for the pre-ionizer.

TEA N2 Pre-Ionizer Electrode/Capacitor Plate

TEA N2 Pre-Ionizer Electrode/Capacitor Plate

TEA N2 Pre-Ionizer Electrode/Capacitor Plate

I took some additional macro-mode photos of the laser bore and electrodes and I have included them in this post.  Larger and more detailed versions of all the images of these nitrogen laser in disassembled are available by clicking them in the gallery below. You can use the navigation arrows in the bottom right hand corner of the image viewer to switch through images.  Enjoy and please feel free to comment or ask questions or provide information at the bottom of this post. All comments are moderated to keep spam out so if it doesn’t show up immediately, it will soon. :)


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