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首页> 外文学位 >Dense spectral beam combining with volume Bragg gratings in photo-thermo-refractive glass.
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Dense spectral beam combining with volume Bragg gratings in photo-thermo-refractive glass.

机译：光致折射玻璃中的密集光谱光束与体积布拉格光栅相结合。

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摘要

Beam combining techniques have become an important tool in the design of high-power high-brightness laser systems. Spectral beam combining (SBC) is an incoherent combining technique that does not require phase control of sources, allowing for a stable and robust system. Using SBC, beams from an array of lasers with each element operated at a different wavelength are combined into a single near-diffraction-limited beam with the same aperture using dispersive optical elements. SBC by means of volume Bragg gratings (VBGs) utilizes unique spectral response of VBGs: diffraction efficiency is close to unity when the Bragg condition is satisfied and is close to zero at multiple points corresponding to particular wavelength offsets from Bragg condition. High-efficiency VBGs can be recorded in UV-sensitive photo-thermo-refractive (PTR) glass. Narrow-band reflecting VBGs allow multi-channel SBC with high spectral density of channels.;In this dissertation, experimental results of SBC with high spectral density of combined channels in two spectral regions of interest (1064 and 1550 nm) are reported. The behavior of narrow-band VBGs under high-power laser radiation is investigated. A laser system with kW-level output power and near-diffraction-limited divergence of spectrally-combined output beam is demonstrated. The system combines five randomly-polarized Yb-doped fiber lasers with 0.5 nm spectral separation in central wavelengths using narrow-band reflecting VBGs with absolute efficiency of combining >90%.
机译：光束组合技术已经成为设计高功率高亮度激光系统的重要工具。光谱光束合并（SBC）是一种非相干合并技术，不需要对光源进行相位控制，从而可以实现稳定可靠的系统。使用SBC，使用色散光学元件将来自激光器阵列的光束（每个元件在不同的波长下工作）合并为具有相同孔径的单个近衍射极限光束。通过体积布拉格光栅（VBG）进行的SBC利用了VBG的独特光谱响应：当满足布拉格条件时，衍射效率接近于1，在与布拉格条件特定的波长偏移相对应的多个点处，衍射效率接近于零。高效VBG可以记录在紫外线敏感的光热折射（PTR）玻璃中。窄带反射VBG允许多通道SBC具有较高的通道光谱密度。本论文报道了在两个感兴趣的光谱区域（1064和1550 nm）具有组合通道高光谱密度的SBC的实验结果。研究了窄带VBG在高功率激光辐射下的行为。演示了一种具有kW级输出功率和光谱组合输出光束的近衍射极限发散度的激光系统。该系统使用窄带反射VBG组合了五个在中心波长处具有0.5 nm光谱间隔的随机偏振Yb掺杂光纤激光器，其绝对效率超过90％。

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  • 作者

    Andrusyak, Oleksiy G.;

  • 作者单位

    University of Central Florida.;

  • 授予单位 University of Central Florida.;
  • 学科 Engineering Electronics and Electrical.;Physics Optics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;光学;
  • 关键词

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