Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Laser Development: Nonlinear Effects

Q 40.5: Talk

Wednesday, March 25, 2015, 12:00–12:15, K/HS2

Extra-narrow linewidth, stable and widely tunable extracted single laser line — •Hassanain Al-Taiy, Stefan Preußler, and Thomas Schneider — Technische Universität Braunschweig, Institut für Hochfrequenztechnik, Schleinitzstraße 22, 38106 Braunschweig, Germany

A high-quality laser source became indispensable for many different applications like high-resolution spectroscopy and coherent optical communications. Therefore, an extra-narrow linewidth, stable and widely tunable extracted source of coherent radiation is demonstrated and experimentally implemented. The extracted single line is achieved by utilizing the polarization pulling assisted stimulated Brillouin scattering as an optical filter and amplifier with a bandwidth of 10-30 MHz. Therefore, one spectral comb line out of a femtosecond-fiber laser with a repetition rate of 100 MHz is selected and amplified, whereas all other lines are suppressed. The fine tuning is performed by an additional modulation, while the course tuning is achieved via the selection of a different line out of the fiber laser. The relative stabilization is done via a measurement of the repetition rate and a corresponding adaptation of the modulation. First proof of concept results show possible linewidths below 1 Hz and an SNR of 47 dB with a tunability of more than 100 nm and a relative stability of ±160 mHz over 5 h.