A ring-cavity synchronously-pumped optical parametric oscillator (OPO) is investigated based on periodically poled KTi:OPO4 (PPKTP). The wavelength of the signal wave covers from 1 000 to 1 500 nm, the output power is 32.3 mW, and idler wave spectrum rang
A cost-effective and high-throughput material named perovskite has proven to be capable of converting 15.9% of the solar energy to electricity, compared to an efficiency of 3.8% that was obtained only four years ago. It has already outperformed most of th