Investigation Of All Solid-state Single-frequency Continuous Wave Tunable 1080/540 Nm Laser

All solid-state high-power single frequency continuous wave lasers pumped by semiconductor laser diodes(LD)have been widely used in atomic physics,precision spectroscopy,quantum information,and other fields due to their simple structure,compact size,excellent output beam quality,and low noise,In particular,lasers with a wavelength of1080 nm and their frequency doubling light of 540 nm can be used to prepare multicomponent continuous variable entangled state light fields for quantum information and computing research.Currently,the most commonly used laser crystal for generating1080 nm laser light is yttrium neodymium aluminate(Nd: YAP)crystal.An intracavity frequency doubled all solid-state laser composed of Nd: YAP laser crystal and frequency doubled lithium triborate(LBO)crystal operating in a one-way traveling wave can achieve high power single frequency continuous wave 1080/540 nm dual wavelength laser output.However,in high-power Nd: YAP/LBO lasers,due to serious thermal effects of laser crystals,intense mode competition,and environmental disturbances(such as ambient temperature fluctuations and airflow disturbances),it is extremely easy for the laser to cause multimode oscillations and mode jumps during long-term operation,which affects the stability of subsequent experimental systems.In order to achieve long-term stable single longitudinal mode operation of 1080/540 nm dual wavelength laser output,this paper designs a high power all solid-state single frequency continuous wave tunable Nd:YAP/LBO laser based on the combination of nonlinear loss and intracavity locking etalon technology.The specific work is as follows:1.Starting from the mode selection principle of solid-state lasers,several modes selection and tuning techniques commonly used in the field of solid-state lasers are introduced.On this basis,the basic principles of combining intracavity locking etalon and introducing nonlinear loss to effectively expand the range of all solid-state single frequency continuous wave continuous tuning and achieve ultra-wide range continuously tunable single frequency laser output are analyzed in detail.2.An all-solid-state single frequency continuous wave tunable Nd: YAP/LBO laser based on the combination of nonlinear loss and intracavity locking etalon technology was designed and implemented.By optimizing the design of the etalon used,a dual wavelength laser output of 1080 nm and 540 nm with an output power of 2.39 W and 4.18 W was achieved.Based on the stable locking etalon,the cavity length of the laser resonator is continuously scanned,achieving a tunable laser output with a continuous tuning range of314.03 GHz(@ 540 nm).Due to the continuous mode hopping free tuning of the laser in the range of 314.03 GHz(@ 540 nm),it is difficult to experience multimode oscillation or mode hopping during long-term operation.In a laboratory environment,the laser can achieve stable single longitudinal mode operation within 24 hours.