In this paper, according to the temperature and strain distribution obtained by considering the Gaussian pump profile and dependence of physical properties on temperature, we derive an analytical model for refractive ...In this paper, according to the temperature and strain distribution obtained by considering the Gaussian pump profile and dependence of physical properties on temperature, we derive an analytical model for refractive index variations of the diode side-pumped Nd：YAG laser rod. Then we evaluate this model by numerical solution and our maximum relative errors are 5% and 10% for variations caused by thermo–optical and thermo–mechanical effects; respectively. Finally, we present an analytical model for calculating the focal length of the thermal lens and spherical aberration. This model is evaluated by experimental results.展开更多
High-power 808 nm vertical-cavity surface-emitting laser(VCSEL)chips have unique characteristics for neodymiumdoped yttrium aluminum garnet(Nd:YAG)laser pumping compared with conventional edge-emitting laser bars,incl...High-power 808 nm vertical-cavity surface-emitting laser(VCSEL)chips have unique characteristics for neodymiumdoped yttrium aluminum garnet(Nd:YAG)laser pumping compared with conventional edge-emitting laser bars,including a chip surface with high reflectivity,near flat top distribution in the near field,larger emitting width and smaller divergence.A novel symmetrical pump cavity with an inter-reflective chamber was invented by introducing even-numbered pumping geometry and removing the conventional internal reflector.Several optical tuning measures were taken to improve the uniformity of the pumping distribution,including power and spectrum balancing in the crosssection and the long axis of the laser rod,a diffuse mechanism in the pump chamber by a frosted flow tube and optional eccentric pumping geometry.A series of VCSEL pumping experiments were conducted and optical tuning measures were evaluated through distribution profiles and efficiencies.A new design philosophy for the VCSEL side-pumped Nd:YAG laser cavity was finally developed.展开更多
文摘In this paper, according to the temperature and strain distribution obtained by considering the Gaussian pump profile and dependence of physical properties on temperature, we derive an analytical model for refractive index variations of the diode side-pumped Nd：YAG laser rod. Then we evaluate this model by numerical solution and our maximum relative errors are 5% and 10% for variations caused by thermo–optical and thermo–mechanical effects; respectively. Finally, we present an analytical model for calculating the focal length of the thermal lens and spherical aberration. This model is evaluated by experimental results.
基金supported by the National Key Research and Development Program of China(Grant No.2024YFB2807702).
文摘High-power 808 nm vertical-cavity surface-emitting laser(VCSEL)chips have unique characteristics for neodymiumdoped yttrium aluminum garnet(Nd:YAG)laser pumping compared with conventional edge-emitting laser bars,including a chip surface with high reflectivity,near flat top distribution in the near field,larger emitting width and smaller divergence.A novel symmetrical pump cavity with an inter-reflective chamber was invented by introducing even-numbered pumping geometry and removing the conventional internal reflector.Several optical tuning measures were taken to improve the uniformity of the pumping distribution,including power and spectrum balancing in the crosssection and the long axis of the laser rod,a diffuse mechanism in the pump chamber by a frosted flow tube and optional eccentric pumping geometry.A series of VCSEL pumping experiments were conducted and optical tuning measures were evaluated through distribution profiles and efficiencies.A new design philosophy for the VCSEL side-pumped Nd:YAG laser cavity was finally developed.
