The narrowband tunable extreme ultraviolet laser setup
A laser-based extreme ultraviolet (XUV) radiation source provides narrowband and tunable radiation in the wavelength range between 90 en 115 nanometer as a collimated coherent beam. The beam of XUV-radiation may be crossed with a beam of atoms or molecules to perform high-resolution sub-Doppler spectrsocopy in this wavelength range. Two setups can be used: one with a bandwidth of 0.3 cm-1 (with course scanning) and one with a bandwidth of 0.01 cm-1 (or 300 MHz). Opportunities for accurate calibration are present (either Doppler-broadened or Doppler-free I2 spectroscopy). Spectroscopy can be performed at an absolute accuracy of 5 x 10-8.The beams are crossed in a setup under high vacuum in several differentially pumped chamber.
Some essential parts of the laser setup are displayed below:
On the left the Pulsed-Dye Amplifier; on the right the ring dyelaser.
The system has been used to perform highly accurate measurements on the XUV-spectrum of the hydrogen molecule. The system has been in employed in several LASERLAB-ACCESS projects focusing on predissociation properties of the CO molecule, the Nitrogen molecule and the HF molecule.
Several other dye laser systems are avaliable to perform XUV double resonance experiments.
Contact Person at LCVU: Wim Ubachs, email: wimu@nat.vu.nl