A equipe da Science Island fez progressos na tecnologia Q-switching de niobato de lítio de alta eficiência a laser de infravermelho médio
Recentemente, o grupo de pesquisa de Jiang Haihe, pesquisador do Laboratório de Tecnologia de Laser Médico do Instituto de Saúde, Instituto de Pesquisa Hefei da Academia Chinesa de Ciências, cooperou com o Grupo de Tecnologia Eletrônica da China e fez importantes progressos na pesquisa de acústica tecnologia óptica Q-switching na banda do infravermelho médio: pela primeira vez, os cristais de niobato de lítio (LiNbO3) foram realizados. Interruptores acústico-ópticos e sua saída Q-switched de alta eficiência em lasers Er,Cr:YSGG de 2,79 μm. Resultados relevantes foram publicados na revista óptica internacional Optics Letters.
Lithium niobate crystal is a traditional multifunctional crystal. In recent years, lithium niobate thin-film photonic devices with extremely low optical loss and rich photoelectric functions have developed rapidly. Lithium niobate is expected to replace silicon materials in the field of integrated photonics. Problems provide solutions. Since the discovery of lithium niobate crystal in 1937, although it has good acousto-optic properties and has been used as a transducer material for a long time, it has not been able to realize the laser acousto-optic Q-switching switch of bulk crystals. This research has realized the homogeneity and integration of the acousto-optic medium and the transducer, which can simplify the manufacturing process, reduce the auxiliary cost, and also reduce the loss of ultrasonic energy, so that the diffraction efficiency of the lithium niobate Q-switch can reach 57%. And the lithium niobate crystal has a high damage resistance threshold (>200 MW/cm2).
