High-Performance Shear Mode Ultrasonic Transducer Operating at Ultrahigh Temperature Fabricated with BiSiO Piezoelectric Crystal.

Shear mode ultrasonic waves are in high demand for structural health monitoring (SHM) applications owing to their nondispersive characteristics, singular mode, and minimal energy loss, especially in harsh environments. However, the generation and detection of a pure shear wave using conventional piezoelectric materials present substantial challenges because of their complex piezoelectric response, involving multiple modes. Herein, we introduce a high-quality piezoelectric crystal BiSiO (BSO), exhibiting a robust piezoelectric response ( = 45.

Continuous-wave and SESAM mode-locked operation of a Yb:YSr(PO) laser.

We report on the continuous-wave (CW) and, for what we believe to be the first time, passively mode-locked (ML) laser operation of an Yb-doped YSr(PO) crystal. Utilizing a 976-nm spatially single-mode, fiber-coupled laser diode as pump source, the Yb:YSr(PO) laser delivers a maximum CW output power of 333 mW at 1045.8 nm with an optical efficiency of 55.

Preparation and Optical Properties of Nd:BiTiO Laser Crystal with Disordered Structure and Attractive Multiwavelength Emission Characteristics.

Laser crystals with multiwavelength emission characteristics are potential light sources for terahertz radiation. Herein, the pure and Nd-doped BiTiO (BTO) laser crystals with sizes up to 16 × 13 × 5 mm were successfully grown using the flux method in the KF-BO-CaBiTiO growth system. The crystal structure, ideal morphology, chemical, mechanical, and thermal properties, optical transmission and Raman spectra, refractive index, absorption, and fluorescence spectra, as well as fluorescence lifetimes, were systematically studied.

Growth, Optical, and Spectroscopic Properties of Pure and Nd-Doped GdSr(PO) Crystals with Disordered Structure.

Disordered crystals have attracted immense attention for the generation of ultrashort laser pulses due to their good thermomechanical characteristics and wide emission bandwidths. In this work, a Gd-based orthophosphate crystal, GdSr(PO), (GSP), and a Nd-doped GdSr(PO) crystal, (Nd:GSP), were obtained by the Czochralski method. The crystal structure, optical properties, electronic band structure, laser damage threshold, and hardness of the GSP crystal were comprehensively investigated.

All-solid-state widely wavelength-tunable and high-efficiency Yb:YSr(PO) laser.

We demonstrate an all-solid-state widely wavelength-tunable :() (Yb:YSP) laser with high efficiency. The free-running Yb:YSP laser oscillating at multiple wavelengths in the range of 1024-1054 nm is realized with different crystal lengths and output coupler transmittances. The maximum output power of 2.