A5019159091- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Plasmonic and Surface Plasmon Research
- Spectroscopy and Chemometric Analyses
- Laser Design and Applications
- Advanced Fiber Optic Sensors
- Optical Coherence Tomography Applications
- Optical Network Technologies
- Optical Coatings and Gratings
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Near-Field Optical Microscopy
- Mechanical and Optical Resonators
- Integrated Circuits and Semiconductor Failure Analysis
Optical Sciences (United States)
2017-2022
University of Michigan
2017-2022
Michigan United
2017-2018
Cornell University
2015
Harbin Institute of Technology
2013
Nanojet effects excited by surface plasmon polariton at the shadow-side surfaces of dielectric microdisks positioned on gold films are reported. The nanojet can propagate over several optical wavelengths while still maintaining a subwavelength full-width half-maximum transverse. Due to nature wave, electric field highly confined metal-dielectric interface is enhanced about 30 times. By varying thickness microdisk, formation be flexibly controlled. shows great promise for Raman scattering and...
High field science relies on ultrashort pulse lasers with multi-joule energies for studying light–matter interactions under extreme conditions and driving particle accelerators secondary radiation sources of x rays, gamma neutrons, positrons, muons, protons. Next-generation laser drivers will require a 10 3 −10 4 times increase in repetition rates, producing at multi-kilowatt average powers to enable practical applications nuclear engineering, advanced materials, medicine, biology, homeland...
81ns effectively-long burst of chirped pulses is amplified to 10mJ with low nonlinearity in a Yb-doped 85µm core CCC-fiber based system, and coherently stacked multi-GTI arrangement, compressed into single <540fs pulse.
Coherent pulse stacking amplification extends ultrashort energies from a fiber amplifier by approximately two orders of magnitude compared to CPA, and can lead compact coherently-combined laser systems with TW-peak kW-average powers.
A new technique of time-domain pulse combining - coherent stacking amplification is enabling nonlinearity-free energy extraction at the stored limit from rare-earth doped fiber based ultrashort systems.
Multi-mJ 81ns effectively-long burst of chirped pulses is amplified through fiber amplification system based on 85µm Yb-doped Chirally-Coupled-Core and coherently stacked into a single pulse. 5.4mJ energy extraction at 1kHz repetition rate demonstrated.
A compact, robust, and inexpensive fiber-based source for coherent Raman imaging would benefit both re-searchers the clinical application of these techniques. However, relative intensity noise fiber sources has precluded their use stimulated scattering microscopy without electronic cancellation. recently demonstrated optical parametric oscillator was used to achieve high-quality images using anti-Stokes microscopy, that self-consistent nature aided low-noise frequency conversion. Thus,...
We report multi-mJ energy (>5mJ) extraction from femtosecond-pulse Yb-doped fiber CPA using coherent pulse stacking amplification (CPSA) technique. This high has been enabled by amplifying 10's of nanosecond long sequence, and 85-µm core CCC based power stage. The CPSA system consists 1-GHz repetition rate mode-locked oscillator, followed a pair fast phase amplitude electro-optic modulators, diffraction-grating stretcher, amplifier chain, GTI-cavity stacker, diffraction grating compressor....
10mJ energy extraction from a single Yb-doped 85µm core CCC fiber has been achieved using coherent pulse stacking amplification (CPSA) technique. This by amplifying burst of 81 stretched pulses with modulated amplitudes and phases, in CPA system where it is amplified to low nonlinearity, coherently stacked into 4+4 cascading GTI cavities. The generated sending femtosecond 1GHz repetition rate mode-locked oscillator pair amplitude phase electro-optic modulators, the carved out pre-shaped...
Mode-locked oscillator pulse phase is stabilized and locked to an external cavity in a novel way by using phase-sensitive peak power response of the Gires-Tournois interferometer, which enables significant increase phase-measurement sensitivity.
We apply momentum stochastic parallel gradient descent (MSPGD) and policy algorithms to optimize coherent pulse stacking (CPS), demonstrate their increased effectiveness compared traditionally used (SPGD) algorithm.
We show equivalence of coherent pulse stacking system to a deep recurrent neural network, and experimentally demonstrate real-time learning on cavities input pulses, necessary for high fidelity temporal combining with ∼ 10 2 pulses.