Helium-Neon Laser Kit 2

Here is nearly everything you need to have a high quality 1 mW helium-neon laser of your very own that can be built into your favorite science project or way-cool case.

Everything is similar to HENELSK1 except for the substitution of a 10" Uniphase or Siemens 0.8 to 1.5 mW HeNe laser tube with a divergence of 2.7 mR.

The standard version kit includes:

1 Uniphase or Siemens 1 to 1.5 mW, 243 mm (10 inch) HeNe laser tube.
1 Laser Drive model 103-23 HeNe laser power supply. This runs from a 21-31 VDC, 500 mA source (not included).
1 Ballast resistor.
1 Set of plastic HeNe laser tube mounting brackets (attached to output leads, can be removed). The output-end bracket can accept an adjustable attenuator (up to about 25 percent reduction in output power). The attenuator will be provided UPON REQUEST at no extra charge.

The laser power supply, ballast resistor, and brackets are wired together so that all you need to do is attach them to a baseplate (this is needed to support the brackets at the correct distance). You will need a source of 21 to 31 VDC at less than 350 mA (positive to red wire, negative to black wire). This can be a DC wall adapter (available from places like Jameco and MCM Electronics for under $10), a homeless laptop power pack, or a home-built power supply (schematics can be found at Adapters for DC HeNe Laser Power Supply Bricks. All parts are available from Radio Shack). Jameco lists several suitable DC wall adapters. I tested the laser with their DCR3405F12 which is rated 24 VDC at 500 mA max (the laser actually draws about 225 mA from the supply). This particular model is regulated but that isn't necessary. The SMPSPWR1 switchmode power supply will work but is just a wee bit of overkill if all you are powering is the laser! A power switch and indicator light are optional (not included).

I will provide a DC wall adapter from Jameco for an additional $25 if you insist, but you can get it cheaper directly.

The laser power supply has an enable input (yellow wire) which turns the laser on when grounded. For details, see: Assembly and Operating Instructions for HENELSK1 Helium-Neon Laser Kit. Theoretically, the current of the laser power supply is a bit low for optimum output power from the laser (3.5 instead of 3.7 mA) but it really works just fine. Order #HENELSK2 or #HENELSK2H.

Serving Suggestion: HENELSK2 with 10" Uniphase tube mounted on wooden base

This rig is being powered by the wall adapter from a defunct laptop computer. Fancy wooden base not included. :)

For an additional $5, this kit is available with the tube and power supply attached by Alden type connectors which make it easier to use the components for other projects (add an "A" to the other order numbers).

All of the components are from supermarket barcode scanners that were removed from service due to upgrade, are in excellent condition, and fully within manufactuer's specs.