The birefringence optical feedback with a folded cavity in HeNe laser is investigated.A theory model based on the equivalent cavity of the Fabry–Perot interferometer is presented.The phase difference between the two ...The birefringence optical feedback with a folded cavity in HeNe laser is investigated.A theory model based on the equivalent cavity of the Fabry–Perot interferometer is presented.The phase difference between the two intensities in birefringence feedback is twice the retardation of the wave plate.The phase difference is invariable when the length of the feedback cavity changes.With the adoption of a cube corner prism(CCP)to form a folded cavity,the fringe frequency is doubled,and the resolution of the displacement sensor based on birefringence optical feedback with a folded cavity is improved.A resistance chain of 5-fold subdivision and 4-fold logic subdivision is used as further subdivision.The resolution ofλ/80 is obtained eventually;for 632.8 nm HeNe laser it is 7.91 nm.The displacement sensor based on birefringence optical feedback with a folded cavity is simple and of high resolution,large measurement range,low cost,and is of great application potential in industry.展开更多
The high-power and frequency-stabilized laser is urgently required in short-exposure interferometry.In this paper,a light source based on the semi-external-cavity HeNe laser is proposed for application.By optimizing t...The high-power and frequency-stabilized laser is urgently required in short-exposure interferometry.In this paper,a light source based on the semi-external-cavity HeNe laser is proposed for application.By optimizing the parameters of the resonant cavity,a high-finesse valley corresponding to monomode operation is generated on the temperature-tuned power curve of the laser.A frequency stabilization device by locating the power valley is constructed,achieving the frequency-stabilized output of about 2.5 mW.The monomode-power conversion efficiency,which is the ratio of the frequency-stabilized output and the resonator output,can reach up to 97.6%,due to the avoidance of the polarized mode selection in the internal-cavity resonator.Compared with the commercial frequency-stabilized HeNe laser,the proposed laser can improve the interferogram contrast from 0.26 to 0.70 in the vibration environment by shortening the camera exposure time.The proposed laser exhibits the high conversion efficiency of monomode power,which is very suitable for short-exposure interferometry.展开更多
基金Supported by the National Natural Science Foundation of Beijing under Grant No 3091002.
文摘The birefringence optical feedback with a folded cavity in HeNe laser is investigated.A theory model based on the equivalent cavity of the Fabry–Perot interferometer is presented.The phase difference between the two intensities in birefringence feedback is twice the retardation of the wave plate.The phase difference is invariable when the length of the feedback cavity changes.With the adoption of a cube corner prism(CCP)to form a folded cavity,the fringe frequency is doubled,and the resolution of the displacement sensor based on birefringence optical feedback with a folded cavity is improved.A resistance chain of 5-fold subdivision and 4-fold logic subdivision is used as further subdivision.The resolution ofλ/80 is obtained eventually;for 632.8 nm HeNe laser it is 7.91 nm.The displacement sensor based on birefringence optical feedback with a folded cavity is simple and of high resolution,large measurement range,low cost,and is of great application potential in industry.
基金supported by the National Natural Science Foundation of China(No.61875087)。
文摘The high-power and frequency-stabilized laser is urgently required in short-exposure interferometry.In this paper,a light source based on the semi-external-cavity HeNe laser is proposed for application.By optimizing the parameters of the resonant cavity,a high-finesse valley corresponding to monomode operation is generated on the temperature-tuned power curve of the laser.A frequency stabilization device by locating the power valley is constructed,achieving the frequency-stabilized output of about 2.5 mW.The monomode-power conversion efficiency,which is the ratio of the frequency-stabilized output and the resonator output,can reach up to 97.6%,due to the avoidance of the polarized mode selection in the internal-cavity resonator.Compared with the commercial frequency-stabilized HeNe laser,the proposed laser can improve the interferogram contrast from 0.26 to 0.70 in the vibration environment by shortening the camera exposure time.The proposed laser exhibits the high conversion efficiency of monomode power,which is very suitable for short-exposure interferometry.
