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We investigate t he ex treme nonlinear optical phenomena using mid-infrared pulses: 1) the laser filamentation in ambient air, pumped by a 2 μm kHz source, for atmospheric chemical detections and 2) the high-harmonic generation i n s olids, dr iven by sub-cycle 2.5–9.0 μm pulses, towards petahertz electronics.
Few-cycle carrier-envelope phase (CEP) stable laser pulses enable the precise control of strong-field electron dynamics, such as high-harmonic generation in gases and solids or electron emission in nano-structures [1]. The intrapulse difference-frequency generation (DFG) pumped by a broadband pulse is a reliable method of producing passively CEP-stable pulses. Mid-infrared (mid-IR) pulse generation...
In cavity-enhanced OPCPA, nonlinear phase shifts imparted on the intracavity pump pulse limit pump power loading and degrade system performance. We show that cavity-locking offsets these effects, maintaining dramatic bandwidth extension and high conversion efficiency.
Cavity-enhanced optical parametric chirped-pulse amplification (OPCPA) extends the capabilities of nonlinear crystals beyond material property limitations, namely nonlinear-coefficient and dispersion. Here we show a dramatic increase in conversion and a three-fold increase in gain bandwidth.
We demonstrate high optical-to-THz conversion efficiency of 3.8% by optical rectification in cryogenically-cooled lithium niobate using near-optimum 680 fs, 1.2 mJ pump pulses centered at 1 μm. Spatial and temporal characterization will be presented.
In a cavity-enhanced optical parametric chirped-pulse amplifier, natural instabilities arise due to the interplay of pump depletion and dispersion when pulse durations longer than the pump to signal/idler walk-off lengths are used.
We study supercontinuum generation using numerical simulations of the nonlinear propagation along hollow-core fibers at different pump wavelengths ranging from 400 nm to 2 μm. A general hollow fiber compressor design strategy is presented.
We demonstrate synchronized few-cycle 800-nm and 2-μm pulse trains seeded from a single Ti:sapphire oscillator, able to generate scalable, high-energy pulses lasting less than a single electric-field cycle. Such pulses are attractive for high-field physics.
An enhancement cavity can optimally reshape the small-signal gain across the interacting pulses of a chirped-pulse parametric amplifier, increasing the gain bandwidth dramatically while simultaneously boosting the conversion efficiency.
We demonstrate a high-peak-power, 1-kHz, 2.2-mum OPCPA for long-wavelength-driven high harmonic generation that produces 9-GW, 3-optical-cycle, CEP-stabilized pulses, allowing tunneling-ionization-threshold intensity with low Guoy phase shift.
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