Helium-Neon Laser Tube: Uniphase 098-1, 1.3 mW

This is a Uniphase model 098-1 helium-neon laser tube removed from a supermarket barcode scanner. It is in excellent condition and has been tested, producing about 1.3 mW after a 10 minute warmup. The tube requires a ballast resistance of 75K ohms, and power supply capable of 1,300 V at 3.7 to 4 mA with an 8 kV start (not included). It is 243 mm (9.6 inches) long by 26 mm (1.05 inches) in diameter. Beam diameter: .75 mm, divergence: 2.6 mR (can be improved with a positive lens), random polarization, output from anode-end of tube. I'll also toss in a set of four (4) 27.4K resistors to use for the ballast resistance (3 should be sufficient but some power supplies may be happier with 4) and a pair of plastic HeNe tube mounting brackets.