Session Index

The 2023 Nobel Prize in Physics was awarded jointly to Drs. Pierre Agostini, Ferenc Krausz, and Anne L’Huillier for their pioneering work in attosecond science. This talk will trace the history of attosecond science from its inception to the present day, highlighting key milestones and influential figures. We then delve into the contemporary applications of attosecond science, demonstrating how attosecond pulses have transformed the study of ultrafast processes. These applications encompass electron dynamics in atoms, molecules, and materials, enabling insights into chemical reactions and structural changes on timescales previously inaccessible. In addition, we highlight the notable contributions and developments in attosecond science within Taiwan, underscoring the global impact of this rapidly advancing field.

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Impulsive Stimulated Raman Scattering (ISRS) is a time-domain spectroscopic technique for studying molecular vibrations, which has superior sensitivity to traditional Raman spectroscopy. We achieve high-resolution observation of molecular vibration using the ultrashort pump and probe pulses. In our experiment, we kept the pump pulse duration fixed at 15 fs while varying its central wavelength. This approach confirms the enhancement of the Raman signal in the spectral region where the pump and probe overlap, consistent with the theoretical model and qualitative descriptions.

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In this study, we demonstrate bandgap engineering of InGaAs/GaAsSb multi-quantum well (MQW) structure grown on GaAs substrates for achieving emission wavelength above 1 μm. Three different structures were grown by molecular-beam epitaxy (MBE). Bandgap engineering simulations were carried out using COMSOL to identify the potential growth parameters for achieving wavelength of 1.3 μm.

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In this article, we demonstrate a self-stabilized all-fiber-based femtosecond laser light source for harmonic generation microscopy. By utilizing self-phase modulation in a photonic crystal fiber and feedback control, the 1220 nm femtosecond source accomplished week-long steady output power performance.

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We demonstrate a novel approach to energetic picosecond 10.2-µm pulse generation
based on nonlinear mixing of subnanosecond single-frequency 1338-nm pulses and broadband
1540-nm chirped pulses in a BGGSe crystal followed by a grating compressor for seeding high-
power CO2 amplifiers. 10.2-µm pulses with an energy exceeding 30-µJ, and their fluctuation is
∼3%-rms are produced routinely. On the basis of the measured pulse spectrum and a single-shot
pulse duration measurement, performed by Kerr polarization rotation time-resolved by a streak
camera, we conclude the measured pulse width is between 2.2-3 ps.

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We demonstrate a high-efficiency 1.55-μm buried heterostructure distributed feedback (BH-DFB) laser. Optimization of the LD structure demonstrated a threshold current of 12 mA and a differential slope efficiency of 0.433 W/A. Under high current and wide temperature conditions, its single-mode optical spectrum remains intact. From a single active region, the laser produces 6.27 W of optical power, which can be verified by pulsed signals. With attributes of high efficiency, singular modal spectra, eye-safety wavelengths, and watt-level optical power, this laser is a promising option for LiDAR systems.

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Cesium lead halide perovskite quantum dots (PQDs) in the all-inorganic form, CsPbX3 (where X = Cl, Br, I), exhibit remarkable optical characteristics suitable for diverse optoelectronic applications. Whispering-gallery-mode (WGM) resonators demand high symmetry, minimal loss, and a high-quality factor (Q). This research capitalizes on the strengths of both PQDs and WGM resonators by uniformly applying PQDs onto SiO2 microspheres. We studied resonant behavior across differently sized WGM cavities and explored resonance characteristics under varying polarizations in-depth. The simulations confirm the consistency of experimental WGM modes.

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