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: First, second, third, fourth, and fifth harmonics of the output of a fiber-pumped passively Q-switched Nd:YAG microchip laser have been obtained and this compact, economical all-solid-state source provides coherent subnanosecond multikilowatt infrared, visible, and ultraviolet pulses at repetition rates in excess of 10 kHz.
Abstract: First, second, third, fourth, and fifth harmonics of the output of a fiber-pumped passively Q-switched Nd:YAG microchip laser have been obtained at pulse energies of 8.0, 3.5, 0.3, 0.7, and 0.01 μJ, respectively, in an optical head occupying a volume of less than 3 cm3. This compact, economical all-solid-state source provides coherent subnanosecond multikilowatt infrared, visible, and ultraviolet pulses at repetition rates in excess of 10 kHz.
67 citations
TL;DR: A significant extension of the high-order harmonic cutoff is demonstrated by using a fully-ionized capillary discharge plasma as the generation medium, which allows for significantly higher photon energies to be generated from xenon ions, compared with the 70 eV observed previously.
Abstract: We demonstrate a significant extension of the high-order harmonic cutoff by using a fully-ionized capillary discharge plasma as the generation medium. The preionized plasma dramatically reduces ionization-induced defocusing and energy loss of the driving laser due to ionization. This allows for significantly higher photon energies, up to 150 eV, to be generated from xenon ions, compared with the 70 eV observed previously. We also demonstrate enhancement of the harmonic flux of nearly 2 orders of magnitude at photon energies around 90 eV when the capillary discharge is used to ionize xenon, compared with harmonic generation in a hollow waveguide. The use of a plasma as a medium for high-order harmonic generation shows great promise for extending efficient harmonic generation to much shorter wavelengths using ions.
67 citations
06 May 2012
TL;DR: Experiments on resonant second-harmonic generation from planar gold split-ring-resonator arrays under normal incidence of light as a function of the lattice constant show that optimum nonlinear conversion occurs at intermediate lattice constants.
Abstract: We perform experiments on resonant second-harmonic generation from planar gold split-ring-resonator arrays under normal incidence of light as a function of the lattice constant. Optimum nonlinear conversion occurs at intermediate lattice constants.
67 citations
TL;DR: A novel quasi-phase-matched frequency converter is fabricated, using a zigzag optical beam path in a thin, polished parallel plate, which demonstrated angle-tuned output at 4.6 to 5.3mum in GaAs and 1.7 to 2.0mUM in ZnSe crystals when pulsed infrared laser sources were used.
Abstract: We fabricated a novel quasi-phase-matched frequency converter, using a zigzag optical beam path in a thin, polished parallel plate. Second-harmonic generation experiments demonstrated angle-tuned output at 4.6 to 5.3 µm in GaAs and 1.7 to 2.0 µm in ZnSe crystals when pulsed infrared laser sources were used.
67 citations
TL;DR: This first optical imaging of voltage-clamped cells by second-harmonic generation of membrane-staining styryl dye di-4-ANEPPS and the sensitivity is significantly better than the optimal 10%/100 mV under fluorescence establishes the importance of second- Harmonic generation for the functional imaging of membrane potential in living cells.
Abstract: We report what is to our knowledge the first optical imaging of voltage-clamped cells by second-harmonic generation. For the membrane-staining styryl dye di-4-ANEPPS, we determined the sensitivity of second-harmonic generation to be 18%/100 mV at an excitation wavelength of 850 nm. This sensitivity is significantly better than the optimal 10%/100 mV under fluorescence and further establishes the importance of second-harmonic generation for the functional imaging of membrane potential in living cells.
67 citations