Frequency-doubling of continuous laser light in Laguerre–Gaussian modes LG_0,0 and LG_3,3

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)