Dual-wavelength switchable single-mode lasing from a lanthanide-doped resonator

Abstract

The development of multi-wavelength lasing, particularly with the wavelength tuning in a wide spectral range, is challenging but highly desirable for integrated photonic devices due to its dynamic switching functionality, high spectral purity and contrast. Here, we propose a general strategy, that relies on the simultaneous design on the electronic states and the optical states, to demonstrate dynamically switchable single-mode lasing spanning beyond the record range (300 nm). This is achieved through integrating the reversely designed nanocrystals with two size-mismatched coupled microcavities. We show an experimental validation of a crosstalk-free violet-to-red single-mode behavior through collective control of asymmetric excitation and excitation wavelength. The single-mode action persists for a wide power range, and presents significant enhancement when compared with that in the microdisk laser. These findings enlighten the reverse design of luminescent materials. Given the remarkable doping flexibility, our results may create new opportunities in a variety of frontier applications.

Magnetic-Field-Driven Reconfigurable Microsphere Arrays for Laser Display Pixels

“…In this case, both WGMs from the two spheres can be observed, which are slightly different and allow for the occurrence of Vernier effect based on the optical coupling of two spheres. 41 The evolution from multiple resonance modes to single resonance mode is obtained in the lasing spectra from the coupled state of spheres (∼15 Gs). The switching between single-mode lasing and multimode lasing in C153-doped microspheres also remains robust after 1000 consecutive cycles between the separated and coupled states, as the magnetic control method is free of any contact and thus its damage to the spheres is extremely low (Figure S17).…”

“…As shown in Figure b, the multiple modes of WGM lasing appear in the lasing spectra that are assigned to the one sphere on the micromagnet ( H on); in contrast, the number of lasing modes increases when the two spheres are attracted but stay separated on the micromagnet (∼7 Gs). In this case, both WGMs from the two spheres can be observed, which are slightly different and allow for the occurrence of Vernier effect based on the optical coupling of two spheres . The evolution from multiple resonance modes to single resonance mode is obtained in the lasing spectra from the coupled state of spheres (∼15 Gs).…”

Unravelling phase and morphology evolution of NaYbF4 upconversion nanoparticles via modulating reaction parameters

“…However, the brightness and quantum yield of UCNPs are substantially weak, partially owing to the relatively low doping concentrations of the sensitizer (<20 mol%) and activator (<2 mol%). [13][14][15] NaYbF 4 nanoparticles have been proposed as a promising alternative host to canonical NaYF 4 for enhancing the brightness and efficiency of UCNPs, as they possess the highest content of Yb 3+ , and are expected to amplify the absorption cross section for maximizing the use of incident light and accelerate energy transfer to the activator. [16][17][18] Thus, core-shell nanostructures with NaYbF 4 as an intermediate shell have been used to not only boost upconversion intensity, but also tailor the emission profile to enhance multiphoton emission.…”

Ultralow‐threshold wideband‐tunable single‐mode ultraviolet lasing from lanthanide‐doped upconversion nanomaterials

“…[1][2][3][4][5][6][7] Particularly, lasing emission with dynamic wavelength-tunability and high monochromaticity facilitates the realization of compact coherent photon sources with high versatility, thereby enhancing the capability for optical multiplexing. [8][9][10][11] Considerable efforts have been devoted to achieving such UV lasers in the form of widely tunable single-mode lasing. One of the most promising gain mediums is the Ce 3+ -doped optical crystal [12][13][14] that can be directly excited by UV irradiation.…”

“…Portable ultraviolet (UV) lasers have drawn widespread attention for their wide applications in science and technology (atmospheric spectroscopy and optical communications), healthcare (medical diagnostics and therapeutics), and environmental protection (sterilization and hazard detection) 1–7 . Particularly, lasing emission with dynamic wavelength‐tunability and high monochromaticity facilitates the realization of compact coherent photon sources with high versatility, thereby enhancing the capability for optical multiplexing 8–11 . Considerable efforts have been devoted to achieving such UV lasers in the form of widely tunable single‐mode lasing.…”