Study On The Sesquioxide Ceramics Of Tm:?Lu,Sc?₂O₃ Laser Pumped By Laser Diode

Transparent ceramic material is a new type of gain medium for lasers.It has excellent optical properties,can be compared with traditional single crystal materials,and has unique advantages in physical properties and preparation.Tm:?Lu,Sc?₂O₃ mixed cubic sesquioxide,as one of many ceramic materials,can produce a 2?m laser.This band of lasers has good safety and is widely used,which has great research prospects..In this paper,some experimental studies on the properties of Tm:?Lu,Sc?₂O₃ mixed cubic sesquioxide and lasers are mainly carried out.First,by analyzing and comparing the development status between the traditional single crystal and the new transparent ceramics,comparing the performance of lasers of different media,a brief analysis was made.Secondly,the theoretical knowledge of some solid-state lasers is analyzed theoretically,and the pump source of the experiment is selected,793 nm LD was used as the pump source,and the 10/90 knife edge method was used to measure the spot radius of the pump light,The resulting radius is 430 ?m..In addition,the energy splitting phenomenon in transparent ceramic materials is discussed,and the corresponding rate equation is established by analyzing the energy level structure of Tm³⁺ ions.Furthermore,the optical characteristics of Tm:?Lu,Sc?₂O₃ sesquioxide are analyzed in detail,and compared with the traditional single crystal.The advantages and disadvantages of transparent ceramic materials are explained from the aspect of ceramic preparation.On these foundations,theoretical analysis and experimental observations of the Tm:?Lu,Sc?₂O₃ solid-state laser were carried out.The temperature distribution of the crystal was analyzed,and the temperature inside the crystal showed a gradient distribution by calculation.When the input optical power was 30 W,the difference between the center temperature and the edge temperature was 20K;the thermal focal length was measured using the boundary stable cavity method.When the input optical power is 6W,the thermal focal length of the crystal is 49mm;the laser pump is theoretically calculated for quantum efficiency,the optimal crystal doping concentration is between 1.5at.% and 3at.%;The effect of four different experimental conditions on the output power of the laser is theoretically analyzed,Finally,the best experimental environment was determined: The best crystal length was 10mm?15mm;the best waist position was in the middle of the crystal;the best pump spot size was between 300?m-400?m;and the best output mirror transmittance was 5 Between 5% and 10%;A stable laser resonator is built,and the output of the 2091 nm laser is obtained.The theoretical slope efficiency of the Tm:?Lu,Sc?₂O₃ transparent ceramic laser with a doping concentration of 1.5at.% is 18.14%,The slope efficiency obtained in the experiment is 18.04%.When the input power is 6.5W,the output laser power is 489 m W;The theoretical slope efficiency of the Tm:?Lu,Sc?₂O₃ transparent ceramic laser with a doping concentration of 1.0at.% is 8.55%,The slope efficiency obtained in the experiment is 8.87%.When the input power is 41.1W,the output laser power is 2.92 W.The laser output parameters and theoretical calculations have been mutually confirmed.