基于4F3/2→4I15/2跃迁的新型全固态人眼安全掺钕激光特性研究
The Study on All-Solid-State Eye-safe Nd3+ Lasers based on 4F3/2→4I15/2 transition
Abstract
波长在1.4μm以上波段的激光,由于较高的水吸收率,所以对人眼的损伤阈值较高,即具有人眼安全特性,人眼安全激光在雷达、医学和通信等领域具有重要的应用。目前,主要采用两种手段来获得人眼安全激光,第一种是直接泵浦掺杂稀土离子的激光增益介质获得,第二种是利用非线性频率变换技术将其他波段的激光转换为人眼安全波段激光;本文采用的是第一种方法来获得人眼安全激光。 长期以来,基于直接下转换方法获得的人眼安全钕离子激光的研究,主要集中在1.4μm波段,对应4F3/2→4I13/2能级跃迁,然而实际上1.4μm波段的水吸收仍然较弱。本文介绍了四能级系统的速率方程,并采用已广泛商业化的808nm半导体激光器作为... Laser operating in the wavelength region above 1.4μm have high water absorption coefficient and high eye damage threshold power, therefore we call it eye-safe laser. Eye-safe lasers have many important applications in the fields of radar, medicine and optical communications. Currently, scholars mainly using two methods to obtain eye-safe lasers. No.1: pumped laser gain mediums doped with rare eart...