activity
20242026
collaborators

5 papers

physics.optics2026

Backward-Wave Difference-Frequency Generation in Thin-Film Lithium Niobate

Yesim Koyaz, Ozan Yakar, Furkan Ayhan +3

Second-order nonlinear processes involving counter-propagating light generation have been explored for quantum applications and optical parametric oscillators. However, realizing t…

astro-ph.IM2026

Test of a 34 GHz EOM laser frequency comb at ESPRESSO

Tobias M. Schmidt, Ewelina Obrzud, François Bouchy +18

Laser frequency combs (LFCs) are a promising technology for wavelength calibration of astronomical high-resolution spectrographs requiring utmost accuracy and stability, since they…

physics.optics2025

Mid-infrared continua via spectral broadening and difference frequency generation in a nanophotonic lithium niobate waveguide

Markus Ludwig, Furkan Ayhan, Thibault Voumard +5

Periodically poled thin film lithium niobate waveguides provide simultaneous access to efficient second and third order nonlinear processes, enabling broadband generation of cohere…

physics.optics2025

Spectral dynamics in broadband frequency combs with overlapping harmonics

Weichen Fan, Furkan Ayhan, Thibault Wildi +8

Optical frequency combs and their spectra of evenly spaced discrete laser lines are essential to modern time and frequency metrology. Recent advances in integrated photonic wavegui…

physics.optics2024

Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides

Markus Ludwig, Furkan Ayhan, Tobias M. Schmidt +21

Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical co…