Helium-Neon Laser

Principle: The difference between spontaneous and stimulated emission of light is demonstrated. The beam propagation within the resonator cavity of a He- Ne laser and its divergence are determined, its stability criterion is checked and the relative output power of the laser is measured as a function of the tube’s position inside the resonator and of the tube current. What you can learn about: * Spontaneous and stimulated light emission * Inversion * Collision of second type * Gas discharge tube * R