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Transverse displacements of the circularly polarized components of a light beam nonnormally incident on GaAs and Silicon are spatially resolved. The imaging relies on pump-probing of two-photon absorption and optically induced free carrier absorption.
Thermal dephasing due to two-photon absorption-induced linear absorption is reduced by minimizing second- and fourth-harmonic beam overlap through tight elliptical focusing perpendicular to the walk-off plane, leading to multi-watt, high-repetition rate ultraviolet generation in BBO.
We investigate the transmission of a cw laser interacting with rubidium vapor and a frequency comb. The results reveal various regimes of competition and the importance of optical pumping and power broadening of the lasers.
We have demonstrated that frequency upconversion in periodically-poled LiNbO3 is capable of reaching single-photon sensitivities for detections at 1.27 μm and 1.57 μm at room temperature.
We report the demonstration of over 30-J of uncompressed broadband energy, indicating the potential peak power in excess of 500-TW with high temporal-contrast around 1011 and a flat-toped spatial-profile with an ∼80 % filling factor.
ELI has been put on the European Roadmap for Research infrastructures by the European Strategy Forum on Research Infrastructures (ESFRI). It will be the first Paneuropean Infrastructure utilizing an ultra-intense laser with a peak-power of 200 PW for interaction experiments with electric field strength well above the PV/m (1015 V/m ). With the high focused intensity (above 4 × 1024W/cm2) it will be...
We experimentally investigate the effects of cascade third-order and fifth-order nonlinear optical processes in a four-level atomic system. The relative strengths of these high-order nonlinear optical processes can be manipulated by controlling the atomic coherence.
We observed quantum interference using two polarization-entangled photon pairs at 1550 nm, created in two periodically poled lithium niobate waveguides. Using four-fold coincidences, a visibility of 75% was observed without subtracting accidental coincidences.
We report the first operation of a Ti:sapphire laser pumped by fiber laser. Using a high-power, cw, frequency-doubled Yb-fiber source at 532nm, continuous-wave operation over 806–970nm with output power >1.1W in TEM00 spatial beam is demonstrated.
A complete model of two-wave mixing in pumped Nd3+ and Yb3+ laser materials in presence of athermal refractive index grating is presented and compared with experimental results obtained in Nd∶YAG. Application to beam-combining is investigated.
We demonstrate room temperature photonic crystal lasers based on high-Q nanobeam cavities. L-L curve shows the lasing threshold of ∼0.6mW and the spontaneous emission factor larger than 0.3.
Broadband laser mode-locking is demonstrated at greatly reduced modelocking strength with an output coupler that compensates for gain filtering. The concept is demonstrated with a >8 fs Ti:sapphire laser showing dramatically improved stability and beam quality.
We report a 13-W, single-frequency, cw green source at 532nm in a TEM00 spatial profile based on simple single-pass SHG of a fiber laser with conversion efficiency as high as 55% using a double-crystal scheme.
We have developed an 1-PW 30-fs Ti:sapphire laser with 0.1-Hz repetition rate. From its final booster amplifier pumped with 96-J energy, IR laser pulses with 47-J energy and flat-top spatial intensity profile have been obtained.
Stable sub-10fs pulses at 400nm were obtained using a beam pointing stabilizer before the hollow fiber compressor system. By using the obtained pulse, we observed the C-H vibration mode of C6H12 at 2955cm−1 in real-time.
We report efficient second harmonic generation of 20.5 W continuous wave laser radiation at 1342 nm using MgO:PPLN. A second harmonic power of 9.5 W in a diffraction limited beam was reached, giving an efficiency of 46%.
We report on a high gain amplification of broadband ultraviolet femtosecond pulses in an optical parametric chirped pulse amplifier. Amplification of 0.5·106 was achieved, with the pulse energy of 30µJ and duration of 24fs.
We present a broadband, high-power, fiber-laser-pumped, continuous-wave optical parametric oscillator for mid-infrared by exploiting extended phase-matching properties of MgO:PPLN. Total powers of 11.3W, with 5.3W broadband mid-infrared idler in excellent beam quality are generated.
By performing two-beam coupling experiments in a liquid crystal light-valve, we show that when slow-light occurs in anisotropic media a large difference of the group index result for orthogonal polarization states of the input pulse.
We present the results of a numerical model and proof-of-principle experiment for temporal phase control using phase-sensitive parametric amplification. Under certain conditions, temporal phase amplification can be achieved in this process.
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