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(From: Dave (dave-ali.net).) I work for a CO2 laser manufacturer (name withheld) and it depends on what you want to cut with itI might downgrade the power output to 700 W if it makes a large price differenceFor Sale 2: Two (2) flowing gas water-cooled CO2 laser heads with power suppliesSecond problem is that of heat exchangerGo to a Track Auto or Auto Zone store and browse the ignition coilsAnd, providing and preparing the physical space: The home-built CO2 laser is not likely to be in any way portable and the kitchen table does not make a good work areaI have cut my tube length from 1,000 mm to 800 mmAnd when they let the reservoir get empty and I fire 'em for not servicing it, they never bother to come get the pumpThis will provide 'steady' output for 80% of the time with 115 VAC input (or 91% at 240 VAC)After approximately 45 minutes of normal operation the cathode electrode (the one we're concerned with) was just warm to the touch (be sure to turn off power for that test!) and measured just a tad over 100 F according to my 'not very accurate at that low temperature' temperature sensorGet a Janos (optics supplier) catalog and some others, just look in a Laser Focus World or on the webYou'll need laser gas mix (on the cheap side), three flow meters (expensive), and then either nitrogen or oxygen to cut depending what you are cutting, polarizing mirrors, output mirrors, etc., etcBrand in Aachen, Germany, was RF excitedCoke charges no rental and only a $30 depositI would guess that experimentation with varying ratios would lead you to the best mix to use in your particular laserThe disadvantage of using a single transformer is the requirement of separate ballast resistors to divide the current to the anodes, but the problem of overheat is present and is very serious!!You can attach either a refrigeration service hose or simply a 1/4" flared copper tubeUntil one day, a family friend of whom I had known since I was a small child started talking to me about lasersCO2 gets vibrationally excited by a collision with electronically excited N2I used ordinary gases; didn't ask for any special purity, from the welding shopMaking your first laser work is going to be enough of a challengeI bought a flat, front silvered mirror with a SiO2 coating and a germanium window with one side flat and the other concave with a focal length of 1 meter, with the flat side AR coated and the concave side uncoated which gave a reflectivity of about 40% given Ge's index of refraction (I'm working from memory so I could be a little off here), for $40 and $350, respectively, from Janos Optical 171bf2437f