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The dynamics of an ensemble of cold excitons created by two-photon resonant excitation is examined by mid-infrared pump-probe spectroscopy. Lyman transitions from the 1s to n-p states of ortho and para-excitons are probed in Cu2O.
We observed phase-matched frequency mixing of a THz wave with a near-infrared laser beam in a ZnGeP2 crystal. Such a process can be used to detect a THz wave in the range of 91-139 mum.
We have demonstrated that two-photon absorption in a 2-cm-thick bulk GaP crystal can be the mechanism for limiting the efficient generation of the ultrafast broadband THz pulses using short infrared laser pulses.
We show analytically and numerically that a stationary rescaled pulse (SRP) can exist in a dispersion decreasing fiber with a linearly decreasing dispersion profile. By using the SRP, we demonstrate extremely pedestal-free pulse compression.
A diode pumped Yb:YAG regenerative amplifier has been developed for short pulse generation. Average output power of 10 W was achieved at pulse repetition rate of 100 kHz with 6.2 ps pulse width.
Stimulated-Brillouin-Scattering (SBS) provides passive Q-switching of a Nd:YAG-laser. Mode-coupling was actively supported by an AOM. Numerical simulations based on spectrally resolved rate equations including SBS-Stokes-shift and mode-locking explain special spectral features of this laser.
We demonstrate rectangular optical pulse generation from short input pulses by using a highly reflective unchirped fiber Bragg grating (FBG) with a simple structure. ~18-ps rectangular pulses are generated successfully from ~3-ps input optical pulses.
We have generated squeezed vacuum in optical telecommunication band by a single-pass parametric amplification in periodically poled lithium niobate. The measured noise reduction was 3.1 dB below the shot-noise level.
Powerful ultrashort pulses are generated using a hybrid MOPA consisting of a passively mode-locked semiconductor laser and a Yb-doped fiber amplifier. Pulses 2 ps in duration are amplified to an average power of 0.8 W.
A compact multi-loop stretcher system with a pulse confining structure was demonstrated. This system generated chirped pulse with 32 ps/nm chirp rate. The energy loss in the stretcher was compensated by the OPCPA.
We propose a new sensing method based on two quantum entangled beams. The effects caused by inserting polarizer or DNA solution into one beam can be also detected in the other undisturbed entangled beam.
A balanced optical-RF phase detector for the extraction of low-jitter RF-signals from optical pulse trains, which is robust against drifts and photodetector nonlinearities, is presented. Sub-10 fs in-loop relative timing jitter is demonstrated.
We demonstrate efficient generation of narrow-bandwidth THz waveforms in optically-contacted multi-layer and orientation-patterned GaAs, using optical rectification of 2-4 mum, 100-fs pump pulses. THz waveforms were directly measured using two-color time-domain spectroscopy.
We report on the quality of ultrashort pulses that are generated by a chirped pulse fiber amplification system when different pulse shapes are amplified. We focus thereby on sech2, parabolic and experimental parabolic pulse shapes.
We study the characteristics of ground-state and excite-state mode-locked pulse trains generated from an external cavity quantum dot mode-locked laser.
Active mode-locking of a near degenerate (~1064 nm) doubly resonant periodically poled LiNbO3 OPO pumped at 532 nm is reported. Pulse durations as short as 700 ps are observed.
We demonstrate an extreme chirped pulse modelocked laser, simultaneously generating near-transform-limited 3.9 ps optical pulses and 510 ps linearly chirped output. The design overcomes fundamental limitations of energy extraction and nonlinearities induced by gain dynamics.
Widely wavelength-tunable ultrashort pulses are generated using passively modelocked Yb-doped fiber laser and photonic crystal fiber. Soliton and anti-stokes pulses are generated in wavelength region of 1.0-1.7 mum and 0.6-0.7 mum, respectively.
We demonstrate that using the nonlinear temporal filtering technique XPW on front end system we increase the pulse contrast by three orders of magnitude and decrease the pulse duration leading to an efficiency of 35%.
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