He-Ne Laser Cavity Experiment - Full Version

This educational kit was designed to help students understand the interaction of different components of a gas laser, laser resonators, mode properties, and the influence of different wavelength-selective optical components used in gas lasers. All optomechanical components have fine adjustments. Several mirrors with different reflectivity and curvature radius can be easily interchanged. The electronic controller of the He-Ne laser tube allows for variation of the current in the tube and includes an internal amplifier for the photodiode. Themes covered: - Properties of gas lasers, pumping by electrical discharge, emission lines and energy levels of helium and neon - Optimization of laser ouExperimentut power by aligning the resonant cavity, evolution of ouExperimentut optical power based on the current feeding the tube - Width and shape of the laser beam inside and outside the cavity, study of the stability criterion - Observation of transverse modes (TEM00 and higher), longitudinal mode selection by an etalon - Laser line selection by birefringent filter (Lyot) and Littrow prism - Determination of emitted beam polarization, creation and study of different types of polarization, verification of Malus' law Principles and objectives: This lab practical uses a He-Ne gas laser tube in an open configuration on both sides with Brewster windows. External mirrors allow closing the resonator, making it possible to study basic principles of gas lasers such as resonator stability, coherence, and mode behavior. The use of a birefringent filter (Lyot) or a prism (Littrow) allows selecting the ouExperimentut wavelength. With a diffraction grating, different laser lines can be spatially separated. Mode selection is also studied using a single-mode etalon. There is a basic version 204826 that can be complemented later.

Composition:
▪ 1 optical rail 1.5 m with graduated ruler
▪ 1 He-Ne laser with support and controller
▪ 2 mirror mounts with angular adjustment on rider
▪ 1 photodiode on rider
▪ 1 green laser with support and power supply (for cavity alignment)
▪ 3 mirrors for resonant cavity
▪ 1 birefringent filter (Lyot) with rotatable support on rider
▪ 1 Littrow prism with angular adjustment support on rider
▪ 1 single-mode etalon with angular adjustment support on rider
▪ 2 additional mirrors for resonant cavity
▪ 1 transmission grating on rider
▪ 2 polarizers in rotatable mount on rider
▪ 1 half-wave plate in rotatable mount on rider
▪ 1 quarter-wave plate in rotatable mount on rider
▪ 2 pairs of Laser safety glasses
▪ 1 optics cleaning kit
▪ 1 set of experiments instructions (in English)