Research on the damage characteristics of bandpass filters by narrow-pulse lasers outside the filter band

Research on the damage characteristics of bandpass filters by narrow-pulse lasers outside the filter band

Citation

郭志城 [Guo Zhicheng]. 窄脉冲激光对带通滤光片带外损伤特性研究 [Research on the damage characteristics of bandpass filters by narrow-pulse lasers outside the filter band]. 长春理工大学 [Changchun University of Science and Technology], 2023. 硕士学位(毕业)论文 [Master's Thesis (Graduation Thesis)].

Keywords

  • 带外损伤 / Out-of-band damage
  • 带通滤光片 / Bandpass filter
  • 激光损伤阈值 / Laser damage threshold
  • 窄脉冲激光 / Narrow-pulse laser
  • 纳秒脉冲激光 / Nanosecond pulse laser
  • 无人机 / UAV
  • 反无人机技术 / Anti-UAV technology
  • 麦克斯韦方程组 / Maxwell's equations
  • 热力学 / Thermodynamics
  • 驻波场 / Standing wave field
  • 温度场 / Temperature field
  • 应力场 / Stress field
  • 入射角 / Incident angle
  • 偏振态 / Polarization state
  • Ti3O5
  • SiO2
  • 1-on-1 method
  • 损伤形貌 / Damage morphology
  • 应力损伤 / Stress damage
  • 熔融损伤 / Melting damage

Brief

This master's thesis investigates the out-of-band damage characteristics of bandpass filters, specifically BP420 and BP905, used in UAV imaging systems when irradiated by a 1064 nm narrow-pulse laser, analyzing the influence of incident angle through theoretical modeling and experimental studies to support anti-UAV technology.

Summary

This master's thesis investigates the out-of-band laser damage characteristics of BP420 and BP905 bandpass filters, which are used in UAV imaging systems, when subjected to a 1064 nm nanosecond pulsed laser. The study combines theoretical modeling based on Maxwell's equations and thermodynamics with experimental testing using the 1-on-1 method to analyze how the incident angle of the laser affects the laser damage threshold and damage patterns of these filters. Key findings indicate that damage primarily originates in the Ti3O5 layer due to its higher absorption, and that stress-induced rupture precedes melting damage. Furthermore, the laser damage threshold varies with the incident angle, showing different trends for the BP420 and BP905 filters due to their distinct film structures and resulting standing wave field distributions. This research aims to provide theoretical and technical support for anti-UAV technology.

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