543nm Green Helium-Neon Gas laser tube - YouTube
Gas laser - Wikipedia
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Laser types (Part 1, gas lasers) - Electrical e-Library.com
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PPT - Gas Lasers PowerPoint Presentation, free download - ID:4927615
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Gas Detection: The Laser Approach - AWE Magazine
Researchers generate terahertz laser with laughing gas | MIT News | Massachusetts Institute of Technology
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Gas lasers, explained by RP Photonics Encyclopedia; neutral atom, ion, helium-neon, He-Ne, ion lasers, krypton, nitrogen, metal vapor
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