HANGZHOU TOP SPECTRUM OPTOELECTRONIC TECHNOLOGY CO LTD(http://www.tuozhilight.com)wasestablished in April 2020 and located by the Fuchun River in Fuyang District,Hangzhou.Our company is ahigh-tech enterprise incubated by the Hangzhou Institute of Optics and Fine Mechanics,with core foundingteam members hailing from the Shanghai Institute of Optics and Fine Mechanics,Chinese Academy ofSciences.Guided by the philosophy of "Pioneering Innovation,Pursuing Excellence,"we focus on the tech-nological development of upstream core optical functional components in the laser industry.We have nowachieved comprehensive mastery over the customized and batch-scale supply of transmission volumeBragg gratings,reflection volume Bragg gratings,and chirped volume Bragg gratings(CVBGs)tailored toour proprietary application requirements and user application scenarios.

To date, we have filed 19 national invention patents(9 granted)and 2 utility model patents(both granted),and registered 3 trademarks.Leveraging our proprietary technologies—including photo-thermo-refractive(PTR)glass preparation,grating design,high-precision stable exposure,thermal development,and perfor-mance testing—we deliver solutions that meet diverse application needs.Our facilities comprise over 1,000square meters of Class 100 and Class 1,000 cleanroom laboratories and production workshops,equippedwith a full range of high-precision inspection instruments.We have obtained GB/T 19001-2016/ISO9001:2015 quality management system certification.Upholding the principle of "Quality First,Custom-er-Centric,"we are committed to providing products of superior quality and reliable performance.