Experiment Adjustment and study of a He-Ne laser cavity

Study of the operating principle of a He-Ne laser cavity and the properties of its radiation. Topics covered: - Adjustment and alignment of a laser cavity via an external mirror - Autocollimation method, resonant cavity, Laser effect - Study of the stability conditions of the cavity. Measurement of emission power as a function of cavity length - Study of geometric properties: spatial profile, Gaussian beam, waist, Rayleigh length (Zr), divergence - Study of the spectra of Helium-Neon gas and laser radiation, monochromaticity, luminescence - Study of polarization, measurement of the polarization rate. Observation of different transverse modes Principles and objectives: The Kit used consists of a tube filled with He-Ne gas. A fixed mirror, with a radius of curvature R1 = 60 cm and reflectivity ≈ 99.99%, is sealed inside this tube. Opposite to this mirror, a Brewster window allows the polarization of the ouExperimentut beam. To close the laser cavity, a second (external) mirror is used. Its radius of curvature is R2 = 45 cm (a 100 cm mirror is available as an option, ref.205115) and its reflectivity is close to 99%. The horizontality and verticality of this mirror can be adjusted using 2 micrometer screws. The experiments to be carried out are as follows: Experiment 1. Adjustment of the cavity to obtain the laser effect Experiment 2. Study of the stability conditions of the cavity Experiment 3. Study of transverse modes Experiment 4. Study of the laser beam divergence Experiment 5. Focusing by a lens and study of the geometric properties of the laser beam Experiment 6. Study of the polarization of the laser beam Experiment 7. Study of the spectra of helium-neon gas and laser radiation This product was developed in collaboration with CY TECH school in Cergy.

Composition:
▪ 1 prismatic bench of 2m with adjustable feet set (ref.202233)
▪ 4 standard prismatic riders (ref.202234)
▪ 1 prismatic rider with lateral adjustment (ref.202392)
▪ 2 prismatic riders with lateral and vertical adjustment (ref.202511)
▪ 1 He-Ne Plasma tube with support and laboratory power supply
▪ 1 cavity output mirror R2 = 45 with precision adjustable X-Y mount (ref.205101)
▪ 1 polarizer in graduated mount (ref.202374)
▪ 1 iris diaphragm (ref.202411)
▪ 1 40 mm diameter lens in mount
▪ 1 perforated screen (ref.202706)
▪ 1 laser power meter with suitable support (ref.295969+204612)
▪ 1 Ovisio analysis camera (ref.204269)
▪ 1 fiber spectrometer with suitable support (ref.204601)
▪ 1 Neon source with power supply (ref.213011)
▪ 1 experiment manual