Programmable microoptics for ultrashort pulses
Programmable microoptics for ultrashort pulses
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DOI：
10.1117/12.856370
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发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
R. Grunwald;M. Bock
中科院分区：
文献类型：
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作者：
R. Grunwald;M. Bock
用于超短脉冲激光束高分辨率空间整形的可编程液晶器件有望成为无源微光学结构的替代方法。在之前的实验中，我们证明了沉积制造的纳米层透镜和轴棱镜可以用作低色散、抗损伤的超宽带微光学元件。利用小角度层微轴棱镜，构建了鲁棒的波前传感器和二维自相关器，利用了稳定且与倾斜无关的非衍射传播。然而，薄膜设计的灵活性在动态范围方面受到限制。对于自适应应用，需要信息编码、图像传输和数据存储、可寻址和相变组件。最近，纯相位反射硅基液晶空间光调制器（LCoS-SLM）问世。通过分析谱域和时域中的脉冲传输行为，结果表明所选版本的 LCoS-SLM 能够塑造具有边际失真的 10-fs 脉冲。通过实验对类脉冲贝塞尔光束和非衍射复杂图案的可变阵列进行整形，并讨论了相关应用。演示了微观尺度上非衍射管状光束像差的自适应校正。良好控制传播的可编程光束模式的独特特性有望覆盖全新的光子应用领域。
Programmable liquid-crystal devices for high-resolution spatial shaping of ultrashort-pulsed laser beams promise to be an alternative approach to passive microoptical structures. In former experiments we demonstrated that depositionfabricated nanolayer lenses and axicons can serve as low-dispersion, damage resistant, ultrabroadband microoptical components. With small-angle layer microaxicons, robust wavefront sensors and 2D autocorrelators were built up with them which took advantage of stable and tilt-independent nondiffracting propagation. The flexibility of the thin-film design, however, was limited with respect to the dynamic range. For adaptive applications, information encoding, image transfer and data storage, addressable and phase variant components are required. Recently, phase-only reflective liquidcrystal- on-silicon spatial light modulators (LCoS-SLMs) became available. By analyzing the pulse transfer behavior in spectral and temporal domain it was shown that selected versions of LCoS-SLMs are capable to shape 10-fs pulses with marginal distortion. Variable arrays of pulsed Bessel-like beams and nondiffracting complex patterns were shaped experimentally and related applications are discussed. The adaptive correction of aberrations in nondiffracting tubular beams on microscale is demonstrated. The unique properties of programmable beam patterns of well controlled propagation promise the coverage of fields of entirely new photonic applications.