Topic
High harmonic generation
About: High harmonic generation is a research topic. Over the lifetime, 11694 publications have been published within this topic receiving 222650 citations. The topic is also known as: HHG.
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TL;DR: In this article, high-order harmonics in a-cut (11-20) ZnO at a high repetition rate of 50 kHz were generated using the tunable mid-infrared pulses from a high-power optical parametric amplifier.
Abstract: We generate high-order harmonics in a-cut (11–20) ZnO at a high repetition rate of 50 kHz, using the tunable mid-infrared pulses (3–4 μm wavelength) from a high-power optical parametric amplifier. For driving laser pulses with 3.8 μm central wavelength, we observe nonperturbative harmonic spectra that well exceed the material band gap. The harmonic spectra depend strongly on the orientation of the crystal with respect to the laser polarization, with odd harmonics exhibiting periodicities of π/2 for a polarization within the (11–20) crystal plane. Energy conversion efficiencies of ∼10−6 per harmonic are measured for the 9th–13th harmonics, yielding an average power of more than 0.2 μW for the 13th harmonic.
56 citations
TL;DR: The induced spectral broadening about a weak non-phase-matched 530-nm second-harmonic pulse is observed by propagating an intense primary 1060-nm picosecond laser pulse through ZnSe crystals.
Abstract: The induced spectral broadening about a weak non-phase-matched 530-nm second-harmonic pulse is observed by propagating an intense primary 1060-nm picosecond laser pulse through ZnSe crystals. This broadening is attributed to the induced phase modulation of excitation states.
56 citations
TL;DR: In this paper, the basic mechanisms, linear and non-linear, for light absorption are reviewed and the processes responsible for harmonic generation are investigated in connection with the ponderomotive force, soliton formation, wavebreaking, etc.
56 citations
Patent•
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22 Aug 1994
TL;DR: In this article, the authors proposed a blue microlaser, which is a composite cavity formed form a gain medium crystal and a nonlinear frequency doubling material which together have four spaced parallel dielectrically coated faces and which is positioned in close proximity to a diode laser pump source.
Abstract: A monolithic diode pumped solid-state laser (11) comprising as the laser host neodymium-doped yttrium orthovanadate (Nd:YVO4) (12, 52) or neodymium-doped gadolinium orthovanadate (Nd:GdVO4) (57, 67) operating on the 4F3/2 → 4I9/2 (∩914 nm or ∩912 nm respectively) transition, to which a suitable nonlinear optic material (16), such as potassium niobate (KNbO3) or beta barium borate (BBO), is bonded. The nonlinear crystal gives rise to intracavity frequency doubling to ∩457 or ∩456 nm. The microlaser is a composite cavity formed form a gain medium crystal and a nonlinear frequency doubling material which together have four spaced parallel dielectrically coated faces (14, 17, 18, 15) and which is positioned in close proximity to a diode laser pump source (13) for phase-matched harmonic generation of blue light along an axis of propagation which lies substantially perpendicular to the two faces of the composite cavity. By employing specific doping concentration-length products of lasant material and pumping the gain medium which has a specific crystalline orientation the desired efficient blue microlaser is achieved. Alternative embodiments combine the Nd:YVO4 and Nd:GdVO4 elements to enhance certain output characteristics of the laser.
56 citations
TL;DR: When an intense laser pulse interacts with homogeneous plasma embedded in a transverse magnetic field, transverse current density oscillating with frequency twice that of the laser field is set up.
Abstract: When an intense laser pulse interacts with homogeneous plasma embedded in a transverse magnetic field, transverse current density oscillating with frequency twice that of the laser field is set up. This leads to generation of second harmonic radiation with significant conversion efficiency.
56 citations