High-stability continuous wave Nd:YVO4 laser

Type of infrastructure:

High-stability continuous wave Nd:YVO4 laser.

Technical description/model and performance:

  • Finesse Pure Nd:YVO4 laser from Laser Quantum. Max power 10 W
  • Wavelength: 532 nm
  • Spectral Bandwidth 50 GHz
  • Power Stability <0.05% RMS
  • Noise <0.02% RMS
  • Pointing Stability <2 µrad/°C
  • Spatial Mode TEM00 with M2 <1.1
  • Divergence <0.4 mrad
  • Beam Diameter 2.25 mm ± 0.25 mm
  • Polarisation Direction Horizontal, with polarization ration 100:1

High-stability continuous wave Nd:YVO4 laser.

Photo: Piotr Matyba

Field of application:

The laser is integrated into a Ti:sapphire oscillator and serves as the pump laser. The oscillator is used to generate fs pulses in the range from UV at 260 nm up to visible at 780 nm. These pulses are used then for time-resolved measurements of optical excitations on surfaces of materials (metals and semiconductors).

Basic Mode of Operation:

Femtosecond pulses of the laser are used to eject electrons from surfaces of materials. Then, the kinetic energy and momentum of electrons are measured as a function of delay time between consecutive pulses of the laser. The information about the electronic structure of the material and dominant interactions in the material are extracted from the measured data. More details of the technique can be found here: https://en.wikipedia.org/wiki/Two-photon_photoelectron_spectroscopy and here: https://en.wikipedia.org/wiki/Laser-based_angle-resolved_photoemission_spectroscopy.

Location:

NA building room 190.

Access to the Instrumentation:

The instrument can only be run by trained personnel only. For use, contact Dr. Piotr Matyba, email: piotr.matyba@umu.se.

Auxiliary Information:

The instrument is used as a pump laser for a Ti:Sapphire oscillator, which is part of surface science time-resolved two-photon photo emission spectroscopy instrument.

Name:

Piotr Matyba.

E-mail:

piotr.matyba@umu.se.

Ulf Sandqvist
3/14/2019