Optical characterization of a neodymium-doped lithium-niobate-on-insulator (LNOI)
Publication date
2021
Document type
Research article
Author
Organisational unit
Scopus ID
Series or journal
Optical materials express
Periodical volume
11
Periodical issue
12
First page
4007
Last page
4014
Part of the university bibliography
✅
Abstract
A neodymium (Nd) doped lithium-niobate-on-insulator (LNOI) was fabricated from a lithium niobate (LN) substrate diffusion-doped with Nd prior to the LNOI fabrication process. Diffusion doping enables the fabrication of differently doped regions on a single LNOI substrate, a key advantage for future applications in highly integrated photonics. Fluorescence spectra, emission cross-section, fluorescence lifetime, and small-signal gain of Nd:LNOI were determined for the first time to our knowledge and compared with data published for diffusion-doped ridge or channel waveguides in LN substrates. For an 11 mm-long sample, we achieve a small-signal gain for p (s) polarization of about 14 (10) dB when pumping with a Ti:Sapphire laser, which is promising for future active components in Nd:LNOI like amplifiers and lasers.
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