IRIS

IRIS THz/Infrared Dipole Beamline

At synchrotron light sources of the second and third generation the emitted radiation in the infrared wavelength region is some orders of magnitude brighter than standard thermal broadband sources (e.g., globar). Infrared synchrotron radiation is an absolute source being polarized and pulsed in the picosecond timescale. As a particular specialty, BESSY II offers a new technique to generate high power, stable and low-noise Coherent Terahertz (THz) Radiation.

Comparison of the intensity (height of the center bursts in the interferogramm) and the noise (100 % lines) of the infrared synchrotron radiation at IRIS with a conventional source (globar) for different apertures in the microscope.

Comparison of the intensity (height of the center bursts in the interferogramm) and the noise (100 % lines) of the infrared synchrotron radiation at IRIS with a conventional source (globar) for different apertures in the microscope.


Station data
Temperature range 1.6K - 500K
Pressure range For details contact the scientist in charge.
More details IR-Spectroscopy and Microscopy
Beamline data
Segment L02
Location (Pillar) 4.1
Source D11 (Dipole)
Monochromator Fourier Transform Spectrometers
Energy range .0006-1 eV, 2-10000 1/cm, 0.1-300 THz
Energy resolution 0.125 1/cm
Flux --
Polarisation linearly horizontal/vertical
Divergence horizontal 60 mrad
Divergence vertical 40 mrad
Focus size (hor. x vert.) diffraction limited
User endstation not possible
Distance Focus/last valve variable mm
Height Focus/floor level variable mm
Beam availability 24h/d
Phone +49 30 8062 14716
Comparison of the coherent synchrotron radiation (CSR) in the 'low alpha' mode with the conventional synchrotron radiation and the radiation from a Globar in the THz spectral range.

Comparison of the coherent synchrotron radiation (CSR) in the 'low alpha' mode with the conventional synchrotron radiation and the radiation from a Globar in the THz spectral range.


The IRIS Beamline at BESSY was inaugurated in December 2001. The large acceptance beamline offering broadband infrared radiation from the THz to the NIR is equipped with several end-stations: e.g., a Fourier-transform infrared (FT-IR) spectrometer (Bruker 66/v), an infrared microscope (Thermo Nicolet Continuµm NexusTM) and a mid infrared mapping ellipsometer (developed at ISAS Berlin). In addition, a free beam port is applicable for breadboarding experiments.

IRIS Endstations


Beamline Performance