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We experimentally demonstrate a passively mode-locking thulium-doped fiber laser based on the combination of the nonlinear polarization rotation (NPR) and the semiconductor saturable absorber mirror (SESAM). In contrast to SESAM mode-locking merely, the fiber lasers based on NPR working together with SESAM have more advantages. By using two mode-locking mechanisms, the nonlinear effect can be enhanced...
CNC machining is an important process to solve problem of difficultly machining for single-crystal sapphire. In order to receive single-crystal conformal sapphire dome, this paper reviews a series of processing experiments, analysis and optimization of process parameters. It receives a set of complete conformal sapphire dome CNC machining technology and the optimal process parameters.
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