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SATURABLE ABSORBER FOR FIBER LASER MODE- LOCKING,FIBER BRAGG GRATING WITH A SATURABLE ABSORPTION PROPERTY AND MODE-LOCKED FIBER LASER.
SATURABLE ABSORBER FOR FIBER LASER MODE- LOCKING,FIBER BRAGG GRATING WITH A SATURABLE ABSORPTION PROPERTY AND MODE-LOCKED FIBER LASER.
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机译：光纤激光器锁模的可饱和吸收器，具有可吸收特性的光纤布拉格光栅和锁模光纤激光器。
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摘要
The present invention relates to lasers, more particularly, it relates to saturable absorbers, and is suitable for fiber laser mode-locking. This invention can be employed for generation of ultrashort light pulses which have applications in various areas such as scientific research, material processing, medicine and other. A saturable absorber for fiber laser mode-locking comprises a single-mode optical fiber having a fiber portion which is tapered or in which at least one longitudinal groove or at least one transverse hole is formed. Said tapered fiber portion is coated with a composite bleachable material, or said grooves or holes are filled with said composite material. In order to broaden a range of applications of the saturable and to extend its service life, said composite bleachable material comprises an inorganic matrix with an index of refraction similar to an index of refraction of the optical fiber and a nonlinear material embedded into said inorganic matrix, wherein said nonlinear material possesses a nonlinear absorption property and bleaches when exposed to laser radiation of intensity from 5MW/cm2 to 500MW/cm2, while a waist diameter and of said tapered fiber portion or a number of grooves or holes and their configuration are chosen to satisfy a condition that laser light while propagating in the saturable absorber experiences losses between 1% and 50%. The proposed saturable absorber can be used in a resonator of a mode-locked fiber laser or incorporated into a construction of a fiber Bragg grating.
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机译：本发明涉及激光器，更具体地说，涉及可饱和吸收体，适用于光纤激光器锁模。本发明可用于产生超短光脉冲，该超短光脉冲在诸如科学研究，材料加工，医学等各种领域中都有应用。一种用于光纤激光器锁模的可饱和吸收器，包括具有光纤部分的单模光纤，该光纤部分是锥形的或在其中形成至少一个纵向凹槽或至少一个横向孔。所述锥形纤维部分涂覆有复合可漂白材料，或者所述凹槽或孔填充有所述复合材料。为了拓宽可饱和材料的应用范围并延长其使用寿命，所述复合可漂白材料包括具有与光纤的折射率相似的折射率的无机基质和嵌入所述无机基质中的非线性材料。 ，其中当暴露于5MW / cm 2至500MW / cm 2的强度的激光辐射时，所述非线性材料具有非线性吸收性质和漂白，同时选择腰围直径和所述锥形纤维部分的直径或许多凹槽或孔及其构型为了满足使激光在可饱和吸收体中传播时损失1％至50％的条件。所提出的可饱和吸收器可以用在锁模光纤激光器的谐振器中或结合到光纤布拉格光栅的结构中。
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