可见光通信（VLC）技术巧妙地融合了通信和照明或显示功能，为通信提供了高效便捷的方案。有机电致发光器件（OLED）作为最接近自然阳光的人造光源，在可见光通信系统的发射端展现出巨大的应用潜力。然而，受制于有机发光染料激子辐射复合速率较慢的限制，OLED在高频信号激励时响应速度较慢。为了克服这一限制，我们提出利用微腔结构，旨在通过微腔效应增强有机发光分子的自发辐射速率，从而改善器件的频率响应。研究结果表明，特定腔长的光学微腔引发的Purcell效应能够提升特定波长的光子态密度，从而加速其自发辐射速率。这种增强效应成功地将调制带宽从4 kHz提高到7 kHz，拓展了近75%的响应频率范围。

After reaching a world record of 10 PW, the peak power development of the titanium-sapphire (Ti:sapphire) PW ultraintense lasers has hit a bottleneck, and it seems to be difficult to continue increasing due to the difficulty of manufacturing larger Ti:sapphire crystals and the limitation of parasitic lasing that can consume stored pump energy. Unlike coherent beam combining, coherent Ti:sapphire tiling is a viable solution for expanding Ti:sapphire crystal sizes, truncating transverse amplified spontaneous emission, suppressing parasitic lasing, and, importantly, not requiring complex space-time tiling control. A theoretical analysis of the above features and an experimental demonstration of high-quality laser amplification are reported. The results show that the addition of a 2 × 2 tiled Ti:sapphire amplifier to today’s 10 PW ultraintense laser is a viable technique to break the 10 PW limit and directly increase the highest peak power recorded by a factor of 4, further approaching the exawatt class.

将波长调制技术与离轴积分腔技术相结合，建立了波长调制离轴积分腔输出光谱实验装置，增加吸收光程，避免低频的1/f噪声和与波长无关的背景功率的影响，将其应用于OH自由基探测研究。探测激光器选择2.8 μm中红外室温型连续波分布反馈式二极管激光器，OH自由基选择3 568.52 cm^-1处Q（1.5e）跃迁谱线开展光谱探测，在512 m有效吸收光程和100 s采样时间下，实现了OH自由基1.2×10⁸ molecule/cm³的探测极限。实验研究发现，在弱透过光强下，激光器放大的自发辐射对吸收系数测量影响大，本实验装置下造成了约70倍的吸收低估，需要有效避免。

We first study the effect of cavity modes propagating in the lateral dimension on high-power semiconductor lasers with a large stripe width. A sidewall microstructure was fabricated to prevent optical feedback of lateral resonant modes. Theoretically, we demonstrate the existence of lateral resonant modes in the Fabry–Perot cavity with a large stripe width. Experimentally, we design the corresponding devices and compare them with conventional broad-area diode lasers. About a 15% reduction in threshold current and a 27% increase in maximum electro-optical conversion efficiency are achieved. The amplified spontaneous emission spectrum is narrowed, which proves that lateral microstructures suppress optical feedback of lateral resonant modes. Under a large continuous-wave operation, the maximum output power of laser device is 43.03 W, about 1 W higher than that of the standard broad-area laser at 48 A.

微型激光器具有体型小、光束质量高、激光亮度强和响应速度快等优点，在**、医疗和通信等领域展现出极大的应用潜力。增益介质作为微型激光器的核心部分，是一类具有放大自发辐射特性的材料。其本身的放大自发辐射特性对激光器性能起着至关重要的作用，直接影响微型激光器的阈值、激光能量、稳定性和波长调谐性等性能。近年来，各种新型具有放大自发辐射性能的材料被相继开发，并在各类微型激光器中崭露头角。本文首先介绍激光器中增益介质的放大自发辐射工作原理；然后系统综述微型激光器用各类光学增益介质的特性及不同模式谐振腔产生激光的研究现状，指出目前这些材料所存在的问题，并提出解决策略；最后对其未来发展进行展望，以期对微型激光器的研发有所裨益。

全无机CsPbX₃（X = Cl、Br、I）钙钛矿量子点具有优异的发光性能，是一种极具应用潜力的新型显示材料及激光增益介质。本文制备了发光峰位于640 nm的CsPbBr_1.2I_1.8红光量子点，在该量子点薄膜表面分别涂覆聚甲基丙烯酸甲酯（PMMA）、聚甲基丙烯酸异丁酯（PIBMA）、聚苯乙烯（PS）3种带不同功能基团的聚合物，制备了CsPbBr_1.2I_1.8/PMMA、CsPbBr_1.2I_1.8/PIBMA、CsPbBr_1.2I_1.8/PS复合薄膜，研究它们的放大自发辐射性能。结果表明，聚合物钝化一方面提升了量子点的水稳定性，另一方面，PMMA和PIBMA中的C?O钝化了量子点表面未配位的Pb²⁺，增强了量子点薄膜的光致发光强度。进一步的，在532 nm的纳秒激光泵浦下，CsPbBr_1.2I_1.8/PIBMA薄膜放大自发辐射阈值可低至81???? ?μJ·cm^-2，稳定性也得到提升，展现了作为新型增益介质的潜力。

We demonstrate a simple method to obtain accurate optical waveforms with a gigahertz-level programmable modulation bandwidth and a watt-level output power for wideband optical control of free atoms and molecules. Arbitrary amplitude and phase modulations are transferred from microwave to light with a low-power fiber electro-optical modulator. The sub-milliwatt optical sideband is co-amplified with the optical carrier in a power-balanced fashion through a tapered semiconductor amplifier (TSA). By automatically keeping TSA near saturation in a quasi-continuous manner, typical noise channels associated with pulsed high-gain amplifications are efficiently suppressed. As an example application, we demonstrate interleaved cooling and trapping of two rubidium isotopes with coherent nanosecond pulses.