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We present a novel technique to achieve both high efficiency and broad bandwidth in SFG process using adiabatic conversion scheme, adapted from NMR and light-matter interaction. The robustness and tunability of the scheme are discussed.
We have generated the backward terahertz pulses with record-high average powers of 2.3-11 muW and narrowest bandwidth of 6 GHz from multi-grating periodically-poled lithium niobate by optical rectification at room temperature.
We show that the retracing behavior based in slant-stripe-type periodically-poled RbTiOPO4 can be used to efficiently achieve second-harmonic generation within an ultra-wide spectral range of 1.7-4.0 mum.
Four-wave mixing between a coherent laser signal and incoherent pump in highly nonlinear fiber are investigated theoretically and experimentally, and the effect of incoherence pump on signal is studied.
We present a procedure for simultaneous optimization of efficiency-bandwidth product and superfluorescence noise suppression in ultrabroadband high-energy optical parametric chirped pulse amplification. Gain dependence of parameters makes stage-by-stage signal chirp optimization necessary in multi-stage amplification.
The spatial mode evolution of spectral Raman components generated in and propagated through a tapered hollow-core PCF reveals adiabatic transition from core modes to surface modes. Its effect on the Raman converter is discussed.
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 propose a novel technique for the generation of high power monocycle terahertz pulse beyond the excitation pulse width limitation. Optical pulse may get modulated by emitted intense THz electric field. This causes excitation pulse compression and consequently gives rise to the enhancement of generation efficiency and its bandwidth. We experimentally demonstrate this chi(2) cascaded processes using...
We experimentally demonstrate an optical system for multirate undersampling of several bandwidth limited signals with unknown carrier frequencies within a very broad frequency range. The amplitudes and the phases of the signals were accurately reconstructed.
Ultra-broad bandwidth (3.75 THz) RF spectrum analysis of femtosecond optical pulses is reported for the first time, enabled by the use of a short 6 cm length Chalcogenide waveguide designed for high nonlinearity and broadband low dispersion.
Spectral studies of the second harmonic (SH) of a Nd:YVO4 frequency-shifted feedback laser using a KTP crystal revealed that the SH signal also consists of a frequency comb but chirping twice faster than the fundamental.
The utility of quasiperiodic and random quasi-phase matching is demonstrated theoretically for shaping the spectral emission of high harmonic generation. Demonstrated are simultaneous enhancement of arbitrary spectral regions and enhancement of an extremely wide bandwidth.
We report on a high efficient kHz repetition rate ps OPG in LBO with total conversion efficiencies of >50% in the near infrared. Injection seeding reduced the spectral bandwidth from typically 40 nm to 0.4 nm.
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