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  1. AntSLA

    Helium Cadmium Laser Help (Omnichrome series 74)

    I've found the problem with the sensors not detecting the beam. I got some UV laser glasses and opened the cover for the delivery optics and the beam was clipping one of the scanning head mirrors rather than shining directly on it meaning most of the power was not reaching the build chamber. I...
  2. AntSLA

    Helium Cadmium Laser Help (Omnichrome series 74)

    Thanks for the replies. I will check the voltages hopefully today if not later this week. I have noticed a sticker with various voltages on but have not checked any yet. The power supply is the 100B I think but I'll double check. The laser is controlled by the SLA machine so you switch it off...
  3. AntSLA

    Helium Cadmium Laser Help (Omnichrome series 74)

    Thanks for the replies. I have done the check with a piece of metal and the beam is invisible so it must have been the paper fluorescing, thanks for the suggestion. One problem I've got now (when using paper), although its probably the delivery optics rather than the laser, is that I'm getting...
  4. AntSLA

    Helium Cadmium Laser Help (Omnichrome series 74)

    Thanks for the reply. The laser is used in an old SLA 3D printer from 1999. The printer uses a UV laser to solidify UV photo-reactive resin and it is the original laser from when the machine was first manufactured so must be the UV model. On the side of the laser it just says series 74 and...
  5. AntSLA

    Helium Cadmium Laser Help (Omnichrome series 74)

    I have an Omnichrome series 74 He:Cd laser and I am having trouble getting it to produce UV light. I've found a manual and it says the following: "The Helium pressure in the plasma tube is a few Torr. Cadmium vapor is ionized in the discharge capillary by cataphoresis at the rate about 1...




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