High-quality integrated diamond photonic devices have previously been demonstrated in applications from non-linear photonics to on-chip quantum optics. However, the small sample sizes of single crystal material available, and the difficulty in tuning its
As a promising new way to generate a controllable strong magnetic field, laser-driven magnetic coils have attracted interest in many research fields. In 2013, a kilotesla level magnetic field was achieved at the Gekko XII laser facility with a capacitor–c
Phonon polariton resonances in the mid-infrared spectral range demonstrate properties superior to noble metal-based plasmonics, owing to smaller dissipative loss and better field confinement. However, a conventional way to excite the localized phonon reso
普通的TEM00模激光,其光束横截面的光强度呈高斯分布。使用这样的光束不能获得均匀一致的照明光。要获得均匀一致的照明,建议采用透过率为反高斯分布(中心透过率低)的滤光方法。C. S. Ih曾把Nd玻璃制作的平凸透镜用于准直仪镜头进行滤光试验,获得了强度变化在以内的均匀光束。可是采用这种方法,必须同时满足滤光和准直的要求,因此在设计上受到了玻璃材料特性的限制,而且Nd玻璃最佳浓度的调节和透镜的加工等也不易进行。