Research On Separated-type Dual-frequency Stabilized Laser Based On Integrated Water-cooling Method For Reducing Noises

The rapid development of the ultra-precision equipment manufacturing industry is calling for higher requirements on the spatial measurement axises and measurement accuracy of laser interferometry.As the core issue of laser heterodyne interferometry,the frequency accuracy,polarization extinction ratio,and optical power of interfering light from a frequency-stabilized laser source determine the limit relative measurement accuracy and limit measurement axis that interferometry systems could achieve.At present,the frequency-stabilized He-Ne laser cannot meet the requirements of high-power,high extinction ratio spatially-separated dual-frequency laser output and high-frequency stability at the same time,which has become one of the main obstracles that stick the further improvement of the measurement performance of the laser interferometric measurement technology.In order to meet the measurement requirements of high-precision and highstability of the next-generation interferometer,this dissertation studied the improving of frequency stabilization and output power of high-stabilized-frequency laser in terms of the hear dessipating method and optical configuration of spatially separated high-stabilized-frequency interferometric measurement by analyzing affecting factors influencing frequency-stablization and output power of interfere beams based on the non-power balanced frequency stabilization method.The main work of the subject is as follows:(1)Aiming at the problem that the output optical power of the power balance type dual longitudinal mode frequency stabilized laser is small,a method based on double longitudinal mode unbalanced power frequency stabilization is proposed.The frequency stabilization reference point of this method is at the unequal power of the two longitudinal modes.The larger the offset,the greater the power of the output interference laser is.In addition,the problems of mode competition and low frequency stability are analyzed.The factors affecting the frequency stability are pointed out,which lays a theoretical foundation for the design of unbalanced power high frequency stability lasers.(2)Aiming at the problems of natural radiation-type lasers,such as poor resistance to environmental disturbances,uneven heat dissipation and excessive heat dissipation of strongly-coupled water-cooled heat-dissipating lasers,a multi-layered,weakly-coupled,water-cooled heat dissipation structure model is proposed.Thermodynamic analysis finds the correlation between laser anti-jamming characteristics and thermal conductivity,establishes an integrated water-cooled heat-dissipation structure combining weak and strong coupling,provides a relatively stable temperature stabilization environment for laser tubes,and reduces external environmental interference,improves the anti-jamming ability of the frequency stabilized laser,inhibits the effect of water temperature fluctu ation on the frequency stability of the laser tube with the weak coupling method,and finally achieves the dual purpose of suppressing changes in the ambient temperature and water temperature stress.(3)For the problem that the dual-frequency spatially separated optical path is susceptible to temperature,vibration,and other environmental impacts,firstly,a high-stability spatially separated beam pointing adjusting method and mechanism is proposed.Based on analyzing advantages and disadvantages of tradi tional and new spatially separated structures,a duplex spatially separated optical path following compact-volume and high-stabilization designing rules with high-stabilization construction design to suppress the shift phenomenon of optical paths.Secondly,the long-term stability of optical components is met by optimizing the overall stability of the laser through simulation analysis.(4)Through the analysis of the heat dissipation structure and the analysis of the beam path adjustment structure,this project designed a water-cooled and frequency stabilized laser with integrated high power and high frequency stability.The laser has the characteristics of small size and high power,meeting the needs of multi-axis highprecision measurement.The experimental results of performance test of the laser demonstrate that the relative frequency stability of multi-layer weakly-coupled water-cooled heat dissipation structure lasers can be achieved91 10 / 1h-?,1.68 109 / 24h-?.Based on the non-equilibrium power frequency stabilization method,the laser can obtain an output power up to 67% of the total power,which is 34% more than the traditional double-longitudinal mode method.