VUV Sources

Vacuum ultraviolet light is the dominant continuous excitation for band structure analysis using PES and ARPES as well as for PEEM and Momentum Microscopy. The quality and performance of those measurements strongly depend on the photon density and spot size of the VUV illumination. The FOCUS VUV sources are strictly designed to deliver best performance in that respect. All FOCUS (V)UV sources are equipped with water cooling to guarantee time-stable and vibration- free measurements. Cooling is provided by a water cooling unit, mounted at the back of the source’s housing.

HIS 13
HIS 14 HD
HIS Mono
  • Long lifetime due to filament free design
  • Ease of operation
  • Robust design
  • Discharge regulation
  • Line of sight viewport
  • More than 300 units installed
  • Large range of options

  • Long lifetime due to filament free design
  • Down to 180 µm spot size
  • Large working distance
  • 50 x higher flux density (compared to the
    non-focused source)
  • Operating pressure down to 10-10 mbar range
  • Precise alignment with line of sight viewport
  • More than 30 units installed
  • Dispersive element with 20 % transmission for
    He I and II
  • Patented zone plate arrangement
  • Precise alignment with line of sight viewport using LED
  • Operating pressure down to 10-10 mbar range
  • Integrated pumping port
  • To be combined with
    HIS 13 & 14

The HIS 13 and HIS 14 HD (focused version) lamps are based on the principle of a cold cathode capillary discharge powered by up to 200 mA discharge current (200 W). The sources can be operated with various discharge gases, such as Helium, Neon, Argon, Krypton, Xenon or Hydrogen.

Two different focusing mirrors (with down to < 200 µm spot), a patented zone plate based monochromator for He I/II, a linear polarizer and an attenuator for highly sensitive samples, are modular extensions to the HIS 13 which allow for upgrading the cost effective base model step by step.

Those features make the FOCUS HIS 13/14 MONO the ideal excitation source for best ARPES and Momentum Microscopy performance of todays surface science research as for example on  2D-  or organic materials.

In particular for high performance PEEM/NanoESCA excitation, we have developed the focused Hg UV-source with optional polarization filter. It is perfectly suited in combination with the
HIS 14 HD/MONO to support effective real space navigation with ARPES.

Mercury Arc UV Source

The FOCUS Mercury Arc UV Source is a compact arc discharge excitation source for use in scientific applications. It is especially developed for the FOCUS PEEM and NanoESCA to be mounted to a DN35/40 CF flange. The parallel light beam output of the UV source is directed through a Heat Filter that cut-off the IR radiation and further on to the Vacuum Lens Assembly that focuses the UV light onto a sample via an in-vacuum lens.

Power Supplies

All our photon sources are available with dedicated power supplies for an optimal operation work flow.

  • Fully digital unit design
  • Discharge regulation
  • Integrated pressure measurement
  • More than 300 units installed
  • Automated plasma ignition
  • Ease of operation
  • Up to 1 kV anode voltage
  • Up to 300 mA discharge current