On-chip tunable microdisk laser fabricated on Er³⁺-doped lithium niobate on insulator

Abstract

We demonstrate a C-band wavelength-tunable microlaser with an Er 3+ doped high quality (~1.02×10 6 ) lithium niobate microdisk resonator. With a 976 nm continuous-wave pump laser, lasing action can be observed at a pump power threshold as low as ~250 μW at room temperature. Furthermore, the microdisk laser wavelength can be tuned by varying the pump laser power, showing a tuning efficiency of ~-17.03 pm/mW at low pump power blow 13 mW, and 10.58 pm/mW at high pump power above 13 mW.

Integrated photonics on thin-film lithium niobate

“…On the classical end, very recently, on-chip waveguide amplifiers [443,444] and microdisk lasers [445][446][447] were demonstrated using Er 3+ -doped thin-film LN. In these works, Er 3+ -doped LN thin films were ion-sliced from uniformly doped bulk crystals.…”

“…In Refs. [445][446][447], high-Q microdisks were used as cavities and lasing at telecom wavelengths was observed. Strong photorefractive effect was observed in these microdisk lasers, especially in the presence of a short-wavelength pump.…”

“…Strong photorefractive effect was observed in these microdisk lasers, especially in the presence of a short-wavelength pump. This effect led to a pump power-dependent emission wavelength [445] and reduced pump efficiency [446]. Mitigation of the photorefractive effect, e.g.…”

Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

“…However, such centers could be created by selective doping of the LN host material. Doping of LNOI has been demonstrated with Tm, [118] Er, [119][120][121][122][123][124] and Yb ions, [125,126] which were used to demonstrate photoluminescence, amplification, and lasing. Semiconductor quantum dots can be added to the LNOI platform by hybridization, where a semiconductor structure containing a quantum dot is coupled to a waveguide in LNOI by specifically designed tapers.…”

On‐Chip Integrated Waveguide Amplifiers on Erbium‐Doped Thin‐Film Lithium Niobate on Insulator

“…[ 19 ] A growing impetus on integration of active components such as lasers and amplifiers based on the erbium‐doped TFLNOI platform emerges, though the microchip lasers on the erbium‐doped TFLNOI are only demonstrated very recently, showing great potentials for high‐performance scalable light sources on the TFLNOI platform. [ 20–23 ]…”