Micro diamond tools are indispensable for the efficient machining of microstructured surfaces.The precision in tool manufacturing and cutting performance directly determines the processing quality of components.The ma...Micro diamond tools are indispensable for the efficient machining of microstructured surfaces.The precision in tool manufacturing and cutting performance directly determines the processing quality of components.The manufacturing of high-quality micro diamond tools relies on scientific design methods and appropriate processing techniques.However,there is currently a lack of systematic review on the design and manufacturing methods of micro diamond tools in academia.This study systematically summarizes and analyzes modern manufacturing methods for micro diamond tools,as well as the impact of tool waviness,sharpness,and durability on machining quality.Subsequently,a design method is proposed based on the theory of cutting edge strength distribution to enhance tool waviness,sharpness,and durability.Finally,this paper presents current technical challenges faced by micro diamond tools along with potential future solutions to guide scientists in this field.The aim of this review is to contribute to the further development of the current design and manufacturing processes for micro diamond cutting tools.展开更多
Whispering gallery mode resonators(WGMRs)are used as excellent optical feedback components of narrow-linewidth fiber lasers,applied from distributed fiber sensing to optical fiber communication.However,WGMRs lead to o...Whispering gallery mode resonators(WGMRs)are used as excellent optical feedback components of narrow-linewidth fiber lasers,applied from distributed fiber sensing to optical fiber communication.However,WGMRs lead to output of a few microwatts and serious multi-modes in lasers.In this Letter,we fabricated the specially designed WGMR with an overcoupling structure,and its quality(Q)factor was over 10^(9).It improved laser output power significantly.Based on that,dynamic population gratings were applied successfully in the laser.Finally,a single-frequency WGMR fiber laser was realized.Its linewidth was less than 1.07 kHz,its output power was over 0.107 mW,and its spectral signal-to-noise ratio(SNR)was nearly 50 dB.Our research offers a new scheme of a single-frequency narrow-linewidth WGMR fiber laser.展开更多
The spectral purity of fiber lasers has become a critical issue in both optical sensing and communication fields.As a result of ultra-narrow intrinsic linewidth, stimulated thermal Rayleigh scattering(STRS) has presen...The spectral purity of fiber lasers has become a critical issue in both optical sensing and communication fields.As a result of ultra-narrow intrinsic linewidth, stimulated thermal Rayleigh scattering(STRS) has presented special potential to compress the linewidth of fiber lasers. To suppress stimulated Brillouin scattering(SBS), the most dominant disturbance for STRS in optical fibers, a semi-quantitative estimation has been established to illuminate the mechanism of suppressing SBS in a periodic tapered fiber, and it agrees with experimental results. Finally, a linewidth compression device based on STRS is integrated into a single-longitudinal-mode ring-cavity fiber laser with secondary cavities, and its linewidth is verified to be 200 Hz through a self-heterodyne detecting and Voigt fitting method.展开更多
A whispering gallery mode resonator(WGMR)filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system.It is found that traditional laser output power model is i...A whispering gallery mode resonator(WGMR)filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system.It is found that traditional laser output power model is invalid.We report a correction model of a narrow linewidth fiber laser filtered with a WGMR to analyze its power.We believe that the loss of the laser system and the threshold gain increase caused by the WGMR filter lead to the predominate amplified spontaneous emission during the original laser period.According to that,we assume the correction coefficient is an exponential decay related to the Er-doped fiber length in the large loss situation,and we verify it experimentally.As a result,the correction model is valid for WGMR-filtered fiber laser.展开更多
基金the China Postdoctoral Science Foundation(No.2024M754169)Fundamentals of Equipment Technology(No.2212W22002)for the support of this work。
文摘Micro diamond tools are indispensable for the efficient machining of microstructured surfaces.The precision in tool manufacturing and cutting performance directly determines the processing quality of components.The manufacturing of high-quality micro diamond tools relies on scientific design methods and appropriate processing techniques.However,there is currently a lack of systematic review on the design and manufacturing methods of micro diamond tools in academia.This study systematically summarizes and analyzes modern manufacturing methods for micro diamond tools,as well as the impact of tool waviness,sharpness,and durability on machining quality.Subsequently,a design method is proposed based on the theory of cutting edge strength distribution to enhance tool waviness,sharpness,and durability.Finally,this paper presents current technical challenges faced by micro diamond tools along with potential future solutions to guide scientists in this field.The aim of this review is to contribute to the further development of the current design and manufacturing processes for micro diamond cutting tools.
基金supported by the National Natural Science Foundation of China(Nos.52075131 and 62305006)the Jiangsu Natural Science Foundation(Basic Research Program of Jiangsu Province)(No.BK20230286)。
文摘Whispering gallery mode resonators(WGMRs)are used as excellent optical feedback components of narrow-linewidth fiber lasers,applied from distributed fiber sensing to optical fiber communication.However,WGMRs lead to output of a few microwatts and serious multi-modes in lasers.In this Letter,we fabricated the specially designed WGMR with an overcoupling structure,and its quality(Q)factor was over 10^(9).It improved laser output power significantly.Based on that,dynamic population gratings were applied successfully in the laser.Finally,a single-frequency WGMR fiber laser was realized.Its linewidth was less than 1.07 kHz,its output power was over 0.107 mW,and its spectral signal-to-noise ratio(SNR)was nearly 50 dB.Our research offers a new scheme of a single-frequency narrow-linewidth WGMR fiber laser.
基金National Natural Science Foundation of China(NSFC)(51575140,61377084)Science Fund for Distinguished Young Scholars of Harbin(RC2016JQ006007)
文摘The spectral purity of fiber lasers has become a critical issue in both optical sensing and communication fields.As a result of ultra-narrow intrinsic linewidth, stimulated thermal Rayleigh scattering(STRS) has presented special potential to compress the linewidth of fiber lasers. To suppress stimulated Brillouin scattering(SBS), the most dominant disturbance for STRS in optical fibers, a semi-quantitative estimation has been established to illuminate the mechanism of suppressing SBS in a periodic tapered fiber, and it agrees with experimental results. Finally, a linewidth compression device based on STRS is integrated into a single-longitudinal-mode ring-cavity fiber laser with secondary cavities, and its linewidth is verified to be 200 Hz through a self-heterodyne detecting and Voigt fitting method.
基金supported by the National Natural Science Foundation of China(NSFC)(No.52075131)。
文摘A whispering gallery mode resonator(WGMR)filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system.It is found that traditional laser output power model is invalid.We report a correction model of a narrow linewidth fiber laser filtered with a WGMR to analyze its power.We believe that the loss of the laser system and the threshold gain increase caused by the WGMR filter lead to the predominate amplified spontaneous emission during the original laser period.According to that,we assume the correction coefficient is an exponential decay related to the Er-doped fiber length in the large loss situation,and we verify it experimentally.As a result,the correction model is valid for WGMR-filtered fiber laser.
