Maximizing energy deposition by shaping few-cycle laser pulses

Shaping convex edges in borosilicate glass by single pass perforation with an Airy beam

We demonstrate curved modifications with lengths of up to 2 mm within borosilicate glass produced by single 1030 nm picosecond laser shots with an Airy beam profile. Plasma ignition in the side lobes of the beam as well as surface damage prove to be the crucial limitations for confined bulk energy deposition on a curved trajectory. A combined experimental and numerical analysis reveals optimum laser parameters for confined bulk energy deposition. This way we achieved single pass cutting of a 525 $μ$m thick glass sheet with a well defined convex edge down to a bending radius of 774 $μ$m.

Non-invasive chemically selective energy delivery and focusing inside a scattering medium guided by Raman scattering

Raman scattering is a chemically selective probing mechanism with diverse applications in industry and clinical settings. Yet, most samples are optically opaque limiting the applicability of Raman probing at depth. Here, we demonstrate chemically selective energy deposition behind a scattering medium by combining prior information on the chemical's spectrum with the measurement of a spectrally resolved Raman speckle as a feedback mechanism for wavefront shaping. We demonstrate unprecedented six-fold signal enhancement in an epi-geometry, realizing targeted energy deposition and focusing on sel…

脉冲激光在液体中烧蚀的束形技术：解锁液体中纳米粒子合成的可调控制

Beam shaping techniques for pulsed laser ablation in liquids: Unlocking tunable control of nanoparticle synthesis in liquids

本文探讨了通过引入束形技术改进脉冲激光在液体中烧蚀，以实现对液体中纳米粒子合成的可调控制。

Wave propagation dynamics inside a complex scattering medium by the temporal control of backscattered waves

Shaping the wavefront of an incident wave to a complex scattering medium has demonstrated interesting possibilities, such as sub-diffraction wave focusing and enhancing light energy delivery. However, wavefront shaping has mainly been based on the control of transmitted waves that are inaccessible in most realistic applications. Here, we investigate the effect of maximizing the backscattered waves at a specific flight time on wave propagation dynamics and energy transport. We find both experimentally and numerically that the maximization at a short flight time focuses waves on the particles co…

超快激光能量沉积在半导体中因纤维化引起的普遍挑战

The universality of filamentation-caused challenges of ultrafast laser energy deposition in semiconductors

本研究证明纤维化普遍决定了各种半导体中超快激光脉冲的传播，通过提取关键非线性参数的时间尺度定律，提出时间-频谱成型优化能量沉积，为半导体内部选择性定制奠定基础。

基于数值孔径（NA）、自旋/轨道角动量（OAM）及原位超连续谱（SC）诊断的聚甲基戊烯（PMP）非线性特性飞秒工程

Femtosecond Engineering of PolyMethylPentene(PMP) Nonlinearity via NA, Spin/orbital angular momentum (OAM), and In-Situ SC Diagnostics

本研究明确OAM对PMP非线性特性的影响，揭示χ(3)张量分量的作用机制，实现OAM控制的亚微米手性结构制造，为光子器件确定性制造提供工程框架。