Laser Physics

Today laser are of great importance in metrology, medicine, materials processing und science in general. At XLAB, there are different open laser systems that are assembled from individual components and need thoroughly adjustment. Doing this, the participants experience hands-on the fundamental principles of laser techniques.

At helium-neon gas laser systems the spectral lines of helium and neon can be observed using a diffraction grating; the laser wavelength is 633 nm.
The open set-up allows to directly see the Brewster windows and the participants can test the corresponding plane of polarization of the laser beam with an analyzer. With a micrometer screw, the beam profile can be measured very precisely and compared to the bell-shaped Gaussian function. Furthermore, the beam diameter can be measured at different positions inside the cavity allowing to determine the beam divergence of the laser.

At Nd:YAG solid-state laser systems the properties of the pumping diode can be investigated and the mean lifetime of the upper laser level can be measured by means of an oscilloscope. With an infrared converter screen, the IR-laser light can be viewed and the wavelength can be measured with a diffraction grating. When a nonlinear crystal is set inside the resonator, frequency doubling is produced as a nonlinear effect. In terms of photons this means that one “green” photon with 532 nm wavelength is created out of two IR-photons with 1064 nm wavelength! Using this visible light the transversal electromagnetic modes can be observed.

In addition, experiments concerning luminescence and polarization can be performed and as application, measurements using an optical Michelson interferometer are possible.

Duration: 1/2 day
Max. number of participants: 9
Suitable combinations: Öffnet internen Link im gleichen FensterX-ray Physics, Öffnet internen Link im gleichen FensterWave Physics

Öffnet internen Link im gleichen FensterApplication