| Millimeter-wave and Asia-Pacific Hertzian wave sources have shown great applications in the fields of wireless communications,optical carrier radar,frequency measurement and spectrum analysis.By changing the temperature of neodymium-doped medium,the frequency difference tuning of dual-frequency laser signal is achieved,and then the dual-frequency laser signal above 100 GHz is obtained,which is of great research value for studying the millimeter wave source with higher frequency range and wider frequency range.In addition,under the premise of super large frequency difference laser signal output,by adjusting the LD pump current and the temperature of the heat sink,laser power balance output can be achieved,and the beat frequency efficiency of the heterodyne beat frequency dual frequency laser signal can be improved,Power ultra-large frequency difference laser signal.The dual frequency microchip laser combines the functions of frequency difference tuning and power balance.It is an innovation in the theory and technology of dual-frequency laser and has good application prospect.In order to study the generation of millimeter-wave double-frequency microdisks more concretely,this dissertation theoretically and experimentally analyzes the thermal-induced frequency difference tuning and power equalization of dual-frequency microchips.The specific contents are from the following four Aspects:(1)A brief overview of the development of millimeter wave technology prospects,the formation of light millimeter wave of the four technologies were described in detail.Through the domestic and foreign research team in the field of micro-chip laser work done to elaborate on their research results.(2)The physical basis and conditions of laser formation are introduced,and the pump source,optical resonator and gain medium which make up the dual-frequency micro-disc laser are analyzed in detail.The four-level rate equation,spectral broadening and mode competition are used to illustrate the operating characteristics of lasers.Finally,the threshold power,output power and slope efficiency of the output characteristics of the microchip laser are summarized.(3)The experimental study on the thermocouple frequency tuning of microchip lasers is carried out.The LD pump current is fixed at 14.0 A and 14.5 A,respectively,by adjusting the laser crystal temperature from 15 ? to 65 ?,and the output laser signal frequency difference can be in the range of 106.2 GHz-123.2 GHz.Tuning.The experimental results show that the output laser signal frequency difference and the laser crystal temperature linear growth relationship,the growth rate of about 0.34 GHz/?.Experiments show that the thermal effect can be tuned to the laser signal frequency difference,the output sub-THz(sub-THz)frequency difference.(4)The thermal effect caused by the laser crystal refractive index and cavity length to do further research.Then the microtitre laser experiment is carried out.When the LD pump current is increased from 13.5 A to 14.5 A under the super large frequency difference laser signal output,in order to ensure that the left and right peak of the laser signal output the same power,the temperature of the corresponding heat sink must be controlled from 71.8? down to 54.2?,at this time to achieve power balance,and then beat the maximum output laser signal power.The experimental results show that there is a negative correlation between LD pumping current and laser crystal temperature at large frequency difference and high power output of dual-frequency laser signal. |
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