Ultralow-Threshold Lithium Niobate Photonic Crystal Nanocavity Laser.
basic_science · Level V
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- Record sourced from PubMed, PMID 40213980.
- Also identified by DOI 10.1021/acs.nanolett.4c06696.
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Abstract
Thin film lithium niobate (TFLN) has emerged as a promising platform for modern complete photonic integrated circuits due to its exceptional optical properties. The development of rare-earth-ion-doped TFLN has led to significant advancements in on-chip microlasers. However, challenges persist in developing energy-efficient, low-threshold lasers on TFLN. In this letter, we report a heterostructure photonic crystal (PhC) nanobeam cavity with a Purcell factor (∼2.4 × 10<sup>4</sup> μm<sup>-3</sup>) and β factor (∼0.23) both enhanced by 2 orders of magnitude compared to whispering gallery mode (WGM) lasers. The first demonstration of the single-mode integrated LN PhC laser is presented, achieving a record-low lasing threshold (1.19 μW) on the erbium-doped TFLN platform, attributed to the enhanced Purcell factor and β factor. The effect of the Purcell and the β factor on ultralow-threshold lasing has been studied in LN PhC lasers, which contributes to the development of low-power TFLN integrated photonics.