Frequency-Agile source of remote optical (UV-THz) emission (market assessment)

本提案涉及与开发频率敏捷辐射源（从UV到THz）相关的市场评估，该频率敏捷辐射源通过在线设置中使用多色显示和通过光谱整形飞秒激光束获得。高功率频率捷变的光辐射源（从可见光到太赫兹）由于复杂性和成本而在技术上还不成熟。目前在非线性光学相互作用和产生辐射在一定的控制距离的方法是基于分裂成几个光束的激光束，改变这些光束中的一些光束的频率和重新组合的各种光束。多波束系统的精确对准、系统复杂性和高稳定性是关键和难以控制的，这限制了其在真实的环境中的实际应用。我们开发了一种新的方法，它绕过了电流的限制，提供了一种方法，空间和时间重叠的双色脉冲或多色脉冲在完全共线的几何形状，在长距离的可调谐UV，维斯，IR和/或THz源的产生通过非线性光学相互作用或光电流产生过程。该系统的开发和测试允许通过可编程控制的激光光谱振幅和相位容易产生频率捷变辐射。该光源可以在一个距离范围（100米-公里）上从调制成不同波长的共线多脉冲的单个激光束产生，脉冲之间具有受控的时间延迟，这些脉冲在多色灯丝中以受控的距离组合。该系统确保完全不敏感的路线，振动和干扰长距离传播，特别是在空气中。本装置中的光学元件的数量减少了，提供了一种鲁棒和紧凑的方式来产生远程辐射，具有用于远程传感或光谱学的完美控制的参数.在2µm和12µm之间的范围内稳定和可编程地产生可调谐的红光发射和2 THz到6 THz范围内的THz辐射已经在长距离上得到了证明。

The present proposal concerns a market assessment related to the development of a source of frequency agileradiation (from UV to THz) obtained by using multi-color filamentation in an in-line setup and by spectrallyshaping a femtosecond laser beam. High power frequency agile sources of optical radiation (from the visible tothe THz) are not technologically mature due to complexity and cost. The current approach in non-linear opticalinteraction and generation of radiation at some controlled distance is based on splitting a laser beam in severalbeams, changing the frequency of some of these beams and recombining the various beams. Precise alignment,system complexity and high stability of the multi-beam system are critical and difficult to control, which limitsthe practical use in a real environment. We developed a novel approach which circumvents the currentlimitations offering a way to spatially and temporally overlap two-color pulses or multi color pulses in acompletely collinear geometry for the generation at long distance of tunable UV, VIS, IR and/or THz sourcevia nonlinear optical interaction or photocurrent generation processes. The system developed and tested allowsan easy generation of frequency-agile radiation through programmable control of the laser spectral amplitudeand phase. The optical source can be generated on a range of distances (100m - km) from a single laser beammodulated into collinear multi-pulses of different wavelengths, with a controlled temporal delay between thepulses, which are combined at a controlled distance in a multiple-color filament. The system ensures acomplete insensibility to alignments, vibrations and turbulences on long distances propagation particularly inair. The number of optical components in the present device is reduced offering a robust and compact way togenerate remote radiation with perfectly controlled parameters for remote sensing or spectroscopy. The stableand programmable generation of tunable Infra-red emission in the range between 2µm and 12µm and THzradiation in the 2THz to 6THz range has been demonstrated at long distances.