Efficient frequency tripling for high-average power UV lasers

高精度激光材料加工已成为制造业中不可缺少的工艺 电子设备，如集成电路、太阳能电池、平板显示器和传感器。这类激光器通常 需要紫外线或可见光范围内的皮秒脉冲辐射，但从固态直接发射 由于缺乏合适的材料，这些波长的介质是具有挑战性的。因此，为了加强这一点， 在这一过程中，红外激光的输出经常被转换成使用多个频率的紫外线范围 效率适中的转换技术。此接洽项目的目标是显著增加 利用一种新开发的方法来提高工业激光系统的转换效率。尤其是，它拥有 最近发现，利用自共振效应的绝热过程表现出很高的 有可能转向光学频率转换，从而提出了替代的有效方案。一个重要的 该技术的优点是与传统的非线性光学晶体兼容，可以 实施时只需对常规设置进行最小程度的更改。 在这个为期六个月的项目中，并与我们的行业合作伙伴(Passat Ltd.)合作我们的目标是 为高效混频(即二次谐波、三次谐波)提供创新的多功能解决方案 谐波和和频率)通过诱导沿非线性的绝热温度分布 晶体，从而控制位相匹配条件。该项目的结果将重新定义 最先进的激光频率转换，创造了一种新的范式，使加拿大处于 国际领导力。此外，该项目的成功实现将为以下工作铺平道路 帕萨特有限公司采用激光制造工艺，以满足其制定的严格标准 要求苛刻的客户，同时提高其产品在市场上的竞争力。新知识 与高素质人才的培训一起产生将有助于提高加拿大的全球 在最先进的高科技领域的竞争力。

High-precision laser material processing has become an indispensable process in the manufacturing of electronic devices such as integrated circuits, solar cells, flat panel displays, and sensors. Such lasers typically require picosecond pulsed radiation in the ultraviolet or visible range, however direct emission from solid-state media at these wavelengths is challenging due to the lack of suitable materials. Thus, in order to enhance this process, the output of infrared lasers is often converted into the ultraviolet range using a number of frequency conversion techniques with moderate efficiency. The aim of this Engage project is to significantly increase the conversion efficiency of industrial laser systems by employing a newly developed method. In particular, it has been recently discovered that adiabatic processes, taking advantage of the autoresonance effect, show high potential towards optical frequency conversion, thus suggesting alternative efficient schemes. An important advantage of this technology is that it is compatible with conventional nonlinear optical crystals and can be implemented with minimal changes to conventional setups. Within this six-month Engage project, and in collaboration with our industrial partner (Passat Ltd.) we aim to offer an innovative versatile solution to efficient frequency mixing generation (i.e. Second Harmonic, Third Harmonic and Sum Frequency Generation) by inducing an adiabatic temperature distribution along a nonlinear crystal, and thus control the phase-matching conditions. The results of this project will redefine the state-of-the-art in laser frequency conversion, creating a new paradigm and placing Canada in a position of international leadership. Furthermore, the successful realization of this Engage project will pave the way for Passat Ltd. to employ laser manufacturing processes in order to meet the stringent standards set by their demanding customers while increasing their products' competitiveness on the market. The new knowledge generated together with the training of highly qualified personnel will contribute to enhance Canada's global competitiveness in the most advanced high-technology sectors.