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Standing on the potential for high-speed modulation and switching in the terahertz (THz) regime, all-optical approaches whose response speeds mainly depend on the lifetime of nonequilibrium free carriers have attracted a tremendous attention. Here, we establish a novel bi-direction THz modulation experiment controlled by femtosecond laser for new functional devices. Specifically, time-resolved transmission...
Coherent pulse stacking (CPS) is a new time-domain coherent addition technique that stacks several optical pulses into a single output pulse, enabling high pulse energy from fiber lasers. We develop a robust, scalable, and distributed digital control system with firmware and software integration for algorithms, to support the CPS application. We model CPS as a digital filter in the Z domain and implement...
We show stacking of multiple equal-amplitude pulses into a single pulse using properly configured sequences of Gires-Tournois interferometers, which in conjunction of chirped pulse amplification in fibers can enable large increase in extractable pulse energies.
We synthesize femtosecond pulses by coherently combining spectra from three fiber chirped pulse amplifiers. Multi-channel spectral synthesis offers a way to overcome gain narrowing limitations in a single fiber amplifier.
Active coherent combining of femtosecond pulses from parallel chirped-pulse fiber amplifiers is demonstrated. This opens a new path for simultaneously increasing both energy and average power of ultrashort pulses from fiber based systems.
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