Praseodymium-ion-doped gain materials have the superiority of lasing at various visible wavelengths directly.Simple and compact visible lasers are booming with the development of blue laser diodes in recent years.In t...Praseodymium-ion-doped gain materials have the superiority of lasing at various visible wavelengths directly.Simple and compact visible lasers are booming with the development of blue laser diodes in recent years.In this Letter, we demonstrate the watt-level red laser with a single blue laser diode and Pr:YLiF4 crystal.On this basis,the passively Q-switched pulse lasers are obtained with monolayer graphene and Co:ZnO thin film as the Q-switchers in the visible range.展开更多
Residual infrared absorption is a key problem affecting the laser emission efficiency of Ti:sapphire crystal.In this paper,the origin of residual infrared absorption of Ti:sapphire crystal is systematically studied by...Residual infrared absorption is a key problem affecting the laser emission efficiency of Ti:sapphire crystal.In this paper,the origin of residual infrared absorption of Ti:sapphire crystal is systematically studied by using the first principles method.According to the contact conditions of O octahedron in the crystal structure of Al_(2)O_(3),four Ti^(3+)−Ti^(3+)ion pair models and three Ti^(4+)−Ti^(3+)ion pair models were defined and constructed.For what we believe is the first time,the near-infrared absorption spectra consistent with the experimental results were obtained in specific theoretical models.The electronic structures,absorption spectra,and charge distributions calculated show that the line-contact Ti^(3+)−Ti^(3+)ion pair with antiferromagnetic coupling and the facecontact Ti^(4+)−Ti^(3+)ion pair are two main contributors to the residual infrared absorption of Ti:sapphire,while some other ion pair models provide a basis to explain more complex residual infrared absorption.展开更多
基金supported by the National Key Research and Development Program of China(Nos.2016YFB0701002and 2016YFB1102301)the National Natural Science Foundation of China(NSFC)(Nos.51772173,51632004,51472257,and 51872307)
文摘Praseodymium-ion-doped gain materials have the superiority of lasing at various visible wavelengths directly.Simple and compact visible lasers are booming with the development of blue laser diodes in recent years.In this Letter, we demonstrate the watt-level red laser with a single blue laser diode and Pr:YLiF4 crystal.On this basis,the passively Q-switched pulse lasers are obtained with monolayer graphene and Co:ZnO thin film as the Q-switchers in the visible range.
基金Strategic Priority Research Program of Chinese Academy of Sciences(XDB1603)National Key Research and Development Program of China(2016YFB0402105)+1 种基金National Natural Science Foundation of China(51872307)Shanghai Technical Trade Measures Response Special Project(19TBT017).
文摘Residual infrared absorption is a key problem affecting the laser emission efficiency of Ti:sapphire crystal.In this paper,the origin of residual infrared absorption of Ti:sapphire crystal is systematically studied by using the first principles method.According to the contact conditions of O octahedron in the crystal structure of Al_(2)O_(3),four Ti^(3+)−Ti^(3+)ion pair models and three Ti^(4+)−Ti^(3+)ion pair models were defined and constructed.For what we believe is the first time,the near-infrared absorption spectra consistent with the experimental results were obtained in specific theoretical models.The electronic structures,absorption spectra,and charge distributions calculated show that the line-contact Ti^(3+)−Ti^(3+)ion pair with antiferromagnetic coupling and the facecontact Ti^(4+)−Ti^(3+)ion pair are two main contributors to the residual infrared absorption of Ti:sapphire,while some other ion pair models provide a basis to explain more complex residual infrared absorption.
