Multi-GHz 'Smart' Burst-mode ultrafast-laser processing of microfluidic structures, biological/medical materials and difficult industrial materials

微流体结构、生物/医学材料和困难工业材料的多 GHz“智能”突发模式超快激光加工

• 批准号: 494025-2016
• 负责人: Marjoribanks, Robin
• 金额: $ 16.38万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=642027
• 关键词: Multi; GHz; Smart; Burst; mode

Four faculty members in Physics, Engineering and Medical Biophysics, together with their students and postdocs, two Canadian companies and a European collaborator, request funding to advance a new generation of intense ultrashort-pulse fibre-laser for manufacturing and high value-added materials treatment, built around two new paradigms: (1) the use of "programmable silicon" instead of custom-designed discrete electronics for shaping, control and stabilization of very fast (2 GHz) laser pulsetrains, according to the application; and (2) 'burst-mode' laser processing at ultra-high repetition rates, above 2 GHz.Ultrafast-pulse lasers, as a class, are now well-known to make remarkable cuts with very low collateral impact. More recently, burst-mode lasers, delivering such pulses in very rapid succession (1-100 MHz) have been shown as a new mode of delivery -- one which gives very precise control of intentional heat accumulation, material sublimation, plasma-mediated ablation, and material modification. In the last year has come the discovery that >2 GHz is even better still than 100 MHz.Our system will deliver trains of high peak power without requiring multi-kilowatt average power, and "programmable silicon" will make it a self-monitoring, self-regulating laser which compares its last output pulse to a template pattern, then corrects operations in ~30ns real time. We'll bypass the need to precisely predict the nonlinear gain dynamics of the ~20,000x amplifier. For this, this system is far more stable and precise, and offers a huge and flexible range of options for different modes of delivery: from ultra-gentle sublimation machining to very specific control of heat for direct-writing internal waveguide structures, from dicing glass in pieces to welding it together, and then changing to writing internal diagnostic optical waveguides -- all without any retooling. Foundational research is one part of the project, to establish optimal patterns, or 'pulse plans', for different needs of processing glasses, crystals, polycrystalline ceramics, biomedical implant materials, metals and others.

物理、工程和医学生物物理学领域的四名教员及其学生和博士后、两家加拿大公司和一家欧洲合作者请求资金来推进新一代强超短脉冲光纤激光器，用于制造和高附加值材料处理围绕两个新范例构建：(1) 根据应用，使用“可编程硅”代替定制设计的分立电子器件来成形、控制和稳定极快 (2 GHz) 激光脉冲串； (2) 超高重复率（高于 2 GHz）的“突发模式”激光加工。超快脉冲激光器作为一类激光器，现在众所周知能够实现显着的切割且附带影响极低。最近，突发模式激光器以非常快的连续速度（1-100 MHz）传输此类脉冲，已被证明是一种新的传输模式，它可以非常精确地控制有意的热量积累、材料升华、等离子体介导的烧蚀，以及材料改性。去年，我们发现 >2 GHz 甚至比 100 MHz 更好。我们的系统将提供高峰值功率系列，而不需要数千瓦的平均功率，并且“可编程硅”将使其成为自我监控、自调节激光器，将其最后的输出脉冲与模板模式进行比较，然后在约 30 纳秒内实时纠正操作。我们将无需精确预测约 20,000 倍放大器的非线性增益动态。为此，该系统更加稳定和精确，并为不同的交付模式提供了广泛而灵活的选择：从超温和的升华加工到直写内部波导结构的非常具体的热量控制，从切割玻璃将其拆散，焊接在一起，然后改为写入内部诊断光波导——所有这些都无需任何重组。基础研究是该项目的一部分，旨在针对加工玻璃、晶体、多晶陶瓷、生物医学植入材料、金属等的不同需求，建立最佳模式或“脉冲计划”。