Multimode lasing from the microcavity of an octagonal quasi-crystal based on holographic polymer-dispersed liquid crystals

Abstract

An eightfold photonic quasi-crystal (PQC) sample is fabricated holographically using two-beam interference with multi-exposure based on polymer-dispersed liquid crystals. The transmission spectra from the finite-difference time-domain (FDTD) simulation prove the photonic stop band of the rotational symmetry structure of the sample. The resonant mode of the circular microcavity formed in the PQC is calculated. Amplified spontaneous emission and multimode lasing action are demonstrated from the pumped laser-dye-doped PQC microcavity using a Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) pulse laser.

Efficient laser emission from organic semiconductor activated holographic polymer dispersed liquid crystal transmission gratings

“…33 It is in stark contrast with the situation in dye-doped lasers in which the very thick HPDLC layer works as the waveguide core layer and several lasing peaks can be found in the output emission. 20,34 The output emission of this new device also contains no parasitic light (e.g. ASE emission) which means spontaneous emission has been effectively suppressed by the supported lasing mode.…”

Lasers Based on Periodic and Quasiperiodic Planar Feedback Cavities: Designs, Principle, and Potential Applications

“…Recent research has explored lasing behavior in diverse QPs microcavities, incorporating complex geometries such as 2D Penrose tiling, 1D Fibonacci and Octonacci sequences, defect points, long-range rotational symmetries, and 3D icosahedral structures [208,209,[214][215][216][217][218][219][220][221][222]. These intricate designs have led to significant advancements in lasing performance, characterized by lower thresholds, efficient feedback in various directions, robust localization of optical modes, emission independence at different surface angles, and minimized beam divergence, resulting in distinctive and well-defined lasing patterns.…”

“…Researchers have employed multi-beam or holographic lithography to design various quasiperiodic (QPs) microcavities with long-rotational symmetries, demonstrating compelling lasing behaviors such as low thresholds, multiwavelength emission, and visually appealing patterns with minimal beam divergence [219,221,[225][226][227][228]. In 2021, Hayat et al used holographic lithography to achieve a 10-fold rotational symmetric QPs laser using a specially designed pentagonal prism coated with colloidal quantum dots (CQDs) nanomaterials (Fig.…”