Frequency-doubling of continuous laser light in Laguerre–Gaussian modes LG0,0 and LG3,3

verfasst von
Joscha Heinze, Henning Vahlbruch, Benno Willke
Abstract

For future generations of gravitational wave detectors, it is proposed to use the helical Laguerre–Gaussian LG33 mode to reduce thermal noise, which limits the detector sensitivity. At the same time, this requires the efficient generation of squeezed vacuum states in the LG33 mode for quantum noise reduction. Since this technique includes the process of second harmonic generation (SHG), we experimentally compare the conversion efficiency and harmonic output field of the LG00 and LG33 modes in a cavity-enhanced SHG using the same 7% doped MgO:LiNbO3 crystal. Conversion efficiencies of 96% and 45% are achieved, respectively. The influence of mode mismatches and astigmatism is analyzed to estimate the ratio of the pump mode-dependent effective nonlinearities to be d00/d33 ∼ 5. Furthermore, we show that absorption loss in the crystal is more relevant for the LG33 mode.

Organisationseinheit(en)
Institut für Gravitationsphysik
QuantumFrontiers
Externe Organisation(en)
Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut)
Typ
Artikel
Journal
Optics letters
Band
45
Seiten
5262-5265
Anzahl der Seiten
4
ISSN
0146-9592
Publikationsdatum
15.09.2020
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Atom- und Molekularphysik sowie Optik
Elektronische Version(en)
https://doi.org/10.1364/OL.402371 (Zugang: Offen)
https://doi.org/10.1364/OL.410805 (Zugang: Offen)