To realize effective co-phasing adjustment in large-aperture sparse-aperture telescopes,a multichannel stripe tracking approach is employed,allowing simultaneous interferometric measurements of multiple optical paths ...To realize effective co-phasing adjustment in large-aperture sparse-aperture telescopes,a multichannel stripe tracking approach is employed,allowing simultaneous interferometric measurements of multiple optical paths and circumventing the need for pairwise measurements along the mirror boundaries in traditional interferometric methods.This approach enhances detection efficiency and reduces system complexity.Here,the principles of the multibeam interference process and construction of a co-phasing detection module based on direct optical fiber connections were analyzed using wavefront optics theory.Error analysis was conducted on the system surface obtained through multipath interference.Potential applications of the interferometric method were explored.Finally,the principle was verified by experiment,an interferometric fringe contrast better than 0.4 is achieved through flat field calibration and incoherent digital synthesis.The dynamic range of the measurement exceeds 10 times of the center wavelength of the working band(1550 nm).Moreover,a resolution better than one-tenth of the working center wavelength(1550 nm)was achieved.Simultaneous three-beam interference can be achieved,leading to a 50%improvement in detection efficiency.This method can effectively enhance the efficiency of sparse aperture telescope co-phasing,meeting the requirements for observations of 8-10 m telescopes.This study provides a technological foundation for observing distant and faint celestial objects.展开更多
For segmented detectors,surface flatness is critical as it directly influences both energy resolution and image clarity.Additionally,the limited adjustment range of the segmented detectors necessitates precise benchma...For segmented detectors,surface flatness is critical as it directly influences both energy resolution and image clarity.Additionally,the limited adjustment range of the segmented detectors necessitates precise benchmark construction.This paper proposes an architecture for detecting detector flatness based on channel spectral dispersion.By measuring the dispersion fringes for coplanar adjustment,the final adjustment residual is improved to better than 300 nm.This result validates the feasibility of the proposed technology and provides significant technical support for the development of next-generation large-aperture sky survey equipment.展开更多
固体MOPA(Master oscillator power amplifier)激光器是一种通过将固体激光器的主振荡器与功率放大器组合,放大低功率信号以输出高功率激光的装置,在激光加工、精密测量、医疗治疗和科学研究等领域有着广泛应用。光束质量作为激光器输...固体MOPA(Master oscillator power amplifier)激光器是一种通过将固体激光器的主振荡器与功率放大器组合,放大低功率信号以输出高功率激光的装置,在激光加工、精密测量、医疗治疗和科学研究等领域有着广泛应用。光束质量作为激光器输出性能的关键指标,直接决定了激光器在这些应用中的效果和精度。但由于固体MOPA激光器中热效应的存在,激光输出过程中常伴随着光束质量的持续恶化,导致性能降低,因此优化光束质量便成为激光器性能提升的关键,在激光器的设计与应用中具有重要的研究与实践意义。本文综述了固体MOPA激光器光束质量优化技术的研究进展,重点介绍了热效应抑制技术、负透镜法、相位共轭法、可变形镜法、球差自补偿法、增益导引法和光束整形法等优化方法。通过分析这些技术的原理、实验进展及应用效果,讨论了它们在提高光束质量方面的挑战和创新成果。此外,文章还指出了固体MOPA激光器在高功率、高效率条件下光束质量优化的难点,并展望了未来可能的研究方向和技术突破。展开更多
文摘To realize effective co-phasing adjustment in large-aperture sparse-aperture telescopes,a multichannel stripe tracking approach is employed,allowing simultaneous interferometric measurements of multiple optical paths and circumventing the need for pairwise measurements along the mirror boundaries in traditional interferometric methods.This approach enhances detection efficiency and reduces system complexity.Here,the principles of the multibeam interference process and construction of a co-phasing detection module based on direct optical fiber connections were analyzed using wavefront optics theory.Error analysis was conducted on the system surface obtained through multipath interference.Potential applications of the interferometric method were explored.Finally,the principle was verified by experiment,an interferometric fringe contrast better than 0.4 is achieved through flat field calibration and incoherent digital synthesis.The dynamic range of the measurement exceeds 10 times of the center wavelength of the working band(1550 nm).Moreover,a resolution better than one-tenth of the working center wavelength(1550 nm)was achieved.Simultaneous three-beam interference can be achieved,leading to a 50%improvement in detection efficiency.This method can effectively enhance the efficiency of sparse aperture telescope co-phasing,meeting the requirements for observations of 8-10 m telescopes.This study provides a technological foundation for observing distant and faint celestial objects.
文摘For segmented detectors,surface flatness is critical as it directly influences both energy resolution and image clarity.Additionally,the limited adjustment range of the segmented detectors necessitates precise benchmark construction.This paper proposes an architecture for detecting detector flatness based on channel spectral dispersion.By measuring the dispersion fringes for coplanar adjustment,the final adjustment residual is improved to better than 300 nm.This result validates the feasibility of the proposed technology and provides significant technical support for the development of next-generation large-aperture sky survey equipment.
文摘固体MOPA(Master oscillator power amplifier)激光器是一种通过将固体激光器的主振荡器与功率放大器组合,放大低功率信号以输出高功率激光的装置,在激光加工、精密测量、医疗治疗和科学研究等领域有着广泛应用。光束质量作为激光器输出性能的关键指标,直接决定了激光器在这些应用中的效果和精度。但由于固体MOPA激光器中热效应的存在,激光输出过程中常伴随着光束质量的持续恶化,导致性能降低,因此优化光束质量便成为激光器性能提升的关键,在激光器的设计与应用中具有重要的研究与实践意义。本文综述了固体MOPA激光器光束质量优化技术的研究进展,重点介绍了热效应抑制技术、负透镜法、相位共轭法、可变形镜法、球差自补偿法、增益导引法和光束整形法等优化方法。通过分析这些技术的原理、实验进展及应用效果,讨论了它们在提高光束质量方面的挑战和创新成果。此外,文章还指出了固体MOPA激光器在高功率、高效率条件下光束质量优化的难点,并展望了未来可能的研究方向和技术突破。
