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Sub-picosecond quasiparticle dynamics of the layered manganite La1.4Sr1.6Mn2O7 and the perovskite manganite La0.7Ca0.3MnO3 are investigated, indicating relaxation proceses corresponding to the redressing time of a photoexcited electron to its polaronic ground state.
Laser ablation is a well-established solid-state film growth technique that typically involves applying a nanosecond laser beam to ablate a target material, followed by depositing the precursor vapor onto a substrate. A main technical obstacle for growing thin films with conventional nanosecond laser ablation is the formation of micron-sized particulates or droplets, which would be unacceptable for...
We demonstrate a simple and efficient grism based stretcher/compression system for the first time. 40 fs, 300 muJ pulses are generated at 5 kHz using this unique amplifier design.
We present a terahertz radiation detector that measures both transverse components of a terahertz single cyclepsilas electric field, allowing the study of polarization dependent properties of materials. Measurements of birefringence in quartz are presented.
Ultrafast-laser pulsetrain-burst processing (microsecond bursts at 100 MHz) is an option for fluence-delivery which leads to exceptional characteristics of morphology and processing-rates; we describe the background science and application to mitigation of high-power laser-induced damage.
The feasibility of using femtosecond laser micro-machining to create Gallium Arsenide (GaAs) quasi-phasematched devices from single GaAs wafers is investigated. We describe machining of the structure and details of the machining quality achievable in GaAs.
It is observed that writing by femtosecond laser from left to right can be different from writing in the opposite direction. Structures with broken mirror symmetry in chalcogenide glass are discovered. Chiral patterns are demonstrated.
We report the fabrication of photonic crystals in lithium niobate crystal by using femtosecond laser-induced microexplosion method. Photonic stop gaps with ~30% suppression rate for a 16-layer FCC structure have been observed.
Two different routes were taken to develop materials for use in all-optical signal processing applications. Both systems exhibited large ultrafast nonlinearities, transparency in the near-infrared, and good processability for integration into photonic devices.
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