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A method for fabricating three-dimensional (3D) photonic crystals (PhCs) easily and simply, by using a visible light (- 532 nm) to pass one triangular pyramid to form non-coplanar multi-beam interference, named laser interference etching technique, is reported. In the experiment, we exposed a 9-μm-thick photoresist on the silicon substrate with exposure intensities of 150, 180, and 220 mJ/cm2, and produced the periodical nanostructures. Through varying a common angle in the triangular pyramid, other interference patterns can be obtained to fabricate various PhCs. 相似文献
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利用BBO晶体在400nm的抽运光与信号光夹角为37°时,可同时在可见光范围内很宽的光谱范围里实现相位匹配的特点,实现了在可见光范围内具有极宽输出光谱宽度的飞秒光学参量放大器(OPA)的稳定运转,其输出脉冲能量大于15μJ,转换效率超过15%.并且在仅采用啁啾镜作为脉冲压缩器的情况下,获得了输出脉冲宽度为135fs的极窄光脉冲,其脉冲宽度压缩比高达22倍
关键词:
非共线相位匹配
光学参量放大
啁啾镜 相似文献
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