Silicon photonics-based high-energy passively Q-switched laser

• DOI: 10.1038/s41566-024-01388-0
• Publication Date: 2024-02-09T11:02:39Z
• Authors: Neetesh Singh; Jan Lorenzen; Milan Sinobad; Kai Wang; Andreas C. Liapis; Henry C. Frankis; Stefanie Haugg; Henry Francis; Jose Carreira; Michael Geiselmann; Mahmoud A. Gaafar; Tobias Herr; Jonathan D. B. Br...; Zhipei Sun; Sonia M. Garcia-B...; Franz X. Kärtner
• Keywords: Biophotonics; Q-switching

Abstract Chip-scale, high-energy optical pulse generation is becoming increasingly important as integrated optics expands into space and medical applications where miniaturization needed. Q -switching of the laser cavity was historically first technique to generate pulses, typically such systems are in realm large bench-top solid-state lasers fibre lasers, especially long wavelength range >1.8 µm, thanks their energy storage capacity. However, photonics, very property tight mode confinement that enables a small form factor becomes an impediment owing cross-sections. Here we demonstrate silicon photonics-based passively -switched with compact footprint using rare-earth gain-based large-mode-area waveguide. We high on-chip output energies >150 nJ 250 ns duration single transverse fundamental retina-safe spectral region (1.9 µm), slope efficiency ~40% ~9 mm 2 . The demonstrated this work comparable or many cases exceeds lasers. This bodes well for field medicine space.