TU Berlin

Prof. Dr. A. HoffmannExcimerlaser - Lab

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Excimerlaser - Lab

The Excimer Lab is named after the primarily used lasers, the Excimer Lasers. It is used for the optical characterization of broad band semiconductors.

Currently a XeCl-Laser with a wavelength of 308 nm is available. With a repetition rate of 100 Hz and a pulse length of 20 ns it has a maximum output power of 16 W. For photoluminescence (PL) measurements the XeCl-Laser could either be used for the pumping of a dye laser or directly as n excitation source. Through to the use of different dyes a spectral range from 332 – 950 nm is available for excitation. Depending on the chosen dye e.g. GaN, ZnO or InGaN can be excited resonantly. For the photoluminescence excitation spectroscopy (PLE) the wavelength range of a dye laser can also be tuned continuously. Due to the pulsed excitation time resolved PL in the micro- and millisecond range can be carried out. Alternatively a HeCd-Laser with a wavelength of 325 nm or 441 nm can be used.

For the detection a 1m additive double monochromator as well as a 0.75 m single UV-monochromator can be used at which, depending on the spectral range, a GaAs-photodiode, a Bi-Alkali-photomultiplier or a multi-channel-plate (MCP) with different cathode materials can be mounted.

For low temperature measurement the samples can be cooled down to 1.8 K in a bath cryostat filled with superfluid helium. Temperature dependent measurements in the range of 4 – 300 K can be carried out with the help of a helium flow cryostat. For magnetic field dependent measurements a magnet cryostat is available.


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