FREQUENCY STABILIZATION

• CO2 Stabialized ER³⁺ - Doped fibre laser at 1578 NM
  A single-mode distributed feedback (DFB) fibre laser has been frequency locked to a CO2 absorption line at 1578.665 nm.

MILLIMETER WAVE GENERATION

• Generation of millimetre-wave signals by stimulated Brillouin scattering for radio over fibre systems
  A new simple method for an all-optical generation of a radio frequency carrier is presented, which is based on stimulated Brillouin scattering (SBS) in an optical fibre and the creation of harmonics by double sideband suppressed carrier modulation.

• Investigation of Brillouin Scattering in Optical Fibers for the Generation of Millimeter Waves
  Stimulated Brillouin scattering (BS) in optical fibers is investigated for the generation of millimeter waves (mm-waves) for radio over fiber systems.

OPTICAL FREQUENCY METROLOGY

• Circumvention of noise contributions in fiber laser based frequency combs
  We investigate the performance of an Er:fiber laser based femtosecond frequency comb for precision metrological applications.
• Long term comparison of two fiber based frequency comb systems
  Mode-locked erbium-doped fiber lasers are ideal comb generators for optical frequency metrology. We compare two fiber frequency combs by measuring an optical frequency independently with both combs and comparing their results.

SPECTROSCOPY AND TRAPPING

• Second-harmonic generation of light at 544 and 272 nm from an ytterbium-doped distributed-feedback fiber laser
  We report external cavity second-harmonic generation of light at 544 and 272 nm based on an ytterbiumdoped distributed-feedback fiber laser.
• Wavelength modulation of fibre lasers - a direct comparison with DFB lasers and extended cavity lasers
  A strain modulated fibre laser is compared with a DFB laser and an extended cavity laser by studying the same absorption line in CO2 at 1578.222 nm in second harmonic spectroscopy.
• Ytterbium fiber laser is efficiently frequency-quadrupled
  To aid in experiments involving optical trapping of ions, researchers at Max-Planck-Institut für Quantenoptik (Garching, Germany) investigated two-step frequency quadrupling of a ytterbium-doped fiber laser.  

TEST & MEASUREMENT

• Wavelength and line width measurement of optical sources with femtometre resolution
  A new and very simple method for the wavelength and line width measurement of optical sources with a resolution in the femtometre range is presented.