The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform
Lantian Hou - One of the best experts on this subject based on the ideXlab platform.
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anti Stokes Signal conversion of femtosecond pulses at near ultraviolet wavelength in photonic crystal fibre
Electronics Letters, 2013Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Hongzhan Liu, Changming Xia, Kuiru Wang, Binbin Yan, Ying Han, Gerald Farrell, Lantian HouAbstract:Anti-Stokes Signals at the near-ultraviolet wavelength are efficiently generated based on degenerate four-wave mixing by coupling the femtosecond pulses into the fundamental mode of a photonic crystal fibre. When the pump pulses with the central wavelength of 840 nm and the average power of 300 mW are used, the conversion efficiency η s of the anti-Stokes Signal at 432 nm can be up to 40℅, and the pulse width is measured to be 42 fs by the Talbot effect.
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highly efficient anti Stokes Signal conversion by pumping in the normal and anomalous dispersion regions in the fundamental mode of photonic crystal fiber
Journal of Lightwave Technology, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Ying Han, Lantian HouAbstract:By pumping near the zero dispersion wavelength, the highly efficient anti-Stokes Signal conversions of the femtosecond pulses in the fundamental mode of photonic crystal fiber (PCF) with the zero dispersion wavelength of 848 nm have been achieved within the wavelength range of 644 to 543 nm. When the pump works at 820 nm, 830 nm and 840 nm with the average power of 500 mW, the power ratios of the anti-Stokes Signals at 594 nm, 581 nm, and 543 nm and the residual pump components are 9.8:1, 17.6:1, and 22.6:1, and the corresponding conversion efficiency η can be up to 33%, 39%, and 46%. When the pump works at 860 nm with the same power, the power ratio of anti-Stokes Signals at 553 nm and the residual pump components is 19.4:1 with η of 43%. In the experiment, because of low output powers of the trivial and residual pump components and high depletion of Stokes components, the output anti-Stokes Signal spectra appear much clearer, and the optical beams of Signals are with good qualities. The influences of pump power and wavelength interval between the working wavelength and zero dispersion wavelength of PCF on the Signal conversion are also demonstrated.
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highly efficient wavelength tunable anti Stokes Signal conversion by phase matched four wave mixing in the second order mode of photonic crystal fiber
Applied Physics B, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Xiangjun Xin, G Y Zhou, Lantian HouAbstract:Using the photonic crystal fiber (PCF) with zero dispersion wavelengths of the fundamental mode and the second-order mode at 985 nm and 885 nm designed and fabricated in our lab, the anti-Stokes Signals from 586.5 to 558 nm are efficiently generated in the second-order mode. When the pump working wavelength λ 0 increases from 830 to 880 nm and the input average power P in reduces from 43 to 25 mW, the output power of anti-Stokes Signal increases 1.76 times, the power ratio of anti-Stokes Signal at 558 nm to the residual pump component at 880 nm is estimated as 5:1, and the maximal conversion efficiency P as/P p0 can be up to 36%. The possible reasons for the difference from theoretical results are discussed. The combined effects of the interval between the pump working wavelength and zero dispersion wavelength and the input power on the Signal conversion process are analyzed.
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highly efficient wavelength tunable anti Stokes Signal conversion of femtosecond pulses in the fundamental mode of photonic crystal fiber
IEEE Journal of Quantum Electronics, 2010Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Lantian HouAbstract:With the photonic crystal fiber (PCF) with the zero dispersion wavelength of fundamental mode around 830 nm designed and fabricated in our lab, the anti-Stokes Signals from 603 to 535 nm are efficiently generated in the fundamental mode by Ti:sapphire laser with central wavelength of 820 nm and pulse width of 150 fs. When the pump power increases from 80 to 320 mW in a separation of 40 mW, the output powers of anti-Stokes Signals increase 6 times, and the maximum power ratio of anti-Stokes Signal at 535 nm to the residual pump component is estimated as 12:1. The maximum output power ratio of the anti-Stokes Signal at 535 nm and the Stokes component at 865 nm is about 2:1. The maximum conversion efficiency of P a/P p0 in experiment can achieve up to 42%, and the possible reasons for discrepancy between experimental and theoretical results are analyzed. Moreover, the influences of other factors on experiment process are elementarily discussed.
Jinhui Yuan - One of the best experts on this subject based on the ideXlab platform.
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anti Stokes Signal conversion of femtosecond pulses at near ultraviolet wavelength in photonic crystal fibre
Electronics Letters, 2013Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Hongzhan Liu, Changming Xia, Kuiru Wang, Binbin Yan, Ying Han, Gerald Farrell, Lantian HouAbstract:Anti-Stokes Signals at the near-ultraviolet wavelength are efficiently generated based on degenerate four-wave mixing by coupling the femtosecond pulses into the fundamental mode of a photonic crystal fibre. When the pump pulses with the central wavelength of 840 nm and the average power of 300 mW are used, the conversion efficiency η s of the anti-Stokes Signal at 432 nm can be up to 40℅, and the pulse width is measured to be 42 fs by the Talbot effect.
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highly efficient anti Stokes Signal conversion by pumping in the normal and anomalous dispersion regions in the fundamental mode of photonic crystal fiber
Journal of Lightwave Technology, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Ying Han, Lantian HouAbstract:By pumping near the zero dispersion wavelength, the highly efficient anti-Stokes Signal conversions of the femtosecond pulses in the fundamental mode of photonic crystal fiber (PCF) with the zero dispersion wavelength of 848 nm have been achieved within the wavelength range of 644 to 543 nm. When the pump works at 820 nm, 830 nm and 840 nm with the average power of 500 mW, the power ratios of the anti-Stokes Signals at 594 nm, 581 nm, and 543 nm and the residual pump components are 9.8:1, 17.6:1, and 22.6:1, and the corresponding conversion efficiency η can be up to 33%, 39%, and 46%. When the pump works at 860 nm with the same power, the power ratio of anti-Stokes Signals at 553 nm and the residual pump components is 19.4:1 with η of 43%. In the experiment, because of low output powers of the trivial and residual pump components and high depletion of Stokes components, the output anti-Stokes Signal spectra appear much clearer, and the optical beams of Signals are with good qualities. The influences of pump power and wavelength interval between the working wavelength and zero dispersion wavelength of PCF on the Signal conversion are also demonstrated.
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highly efficient wavelength tunable anti Stokes Signal conversion by phase matched four wave mixing in the second order mode of photonic crystal fiber
Applied Physics B, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Xiangjun Xin, G Y Zhou, Lantian HouAbstract:Using the photonic crystal fiber (PCF) with zero dispersion wavelengths of the fundamental mode and the second-order mode at 985 nm and 885 nm designed and fabricated in our lab, the anti-Stokes Signals from 586.5 to 558 nm are efficiently generated in the second-order mode. When the pump working wavelength λ 0 increases from 830 to 880 nm and the input average power P in reduces from 43 to 25 mW, the output power of anti-Stokes Signal increases 1.76 times, the power ratio of anti-Stokes Signal at 558 nm to the residual pump component at 880 nm is estimated as 5:1, and the maximal conversion efficiency P as/P p0 can be up to 36%. The possible reasons for the difference from theoretical results are discussed. The combined effects of the interval between the pump working wavelength and zero dispersion wavelength and the input power on the Signal conversion process are analyzed.
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highly efficient and widely wavelength tunable anti Stokes Signal conversion in the fundamental mode of photonic crystal fiber
Optical Fiber Communication Conference, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Cang Jin, Xiangjun XinAbstract:Anti-Stokes Signals from 645 to 543nm are generated in the fundamental mode. The power ratio of Signal at 543 nm to residual pump at 840 nm is 22.6∶1, the conversion efficiency P as /P p0 being above 45%.
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highly efficient wavelength tunable anti Stokes Signal conversion of femtosecond pulses in the fundamental mode of photonic crystal fiber
IEEE Journal of Quantum Electronics, 2010Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Lantian HouAbstract:With the photonic crystal fiber (PCF) with the zero dispersion wavelength of fundamental mode around 830 nm designed and fabricated in our lab, the anti-Stokes Signals from 603 to 535 nm are efficiently generated in the fundamental mode by Ti:sapphire laser with central wavelength of 820 nm and pulse width of 150 fs. When the pump power increases from 80 to 320 mW in a separation of 40 mW, the output powers of anti-Stokes Signals increase 6 times, and the maximum power ratio of anti-Stokes Signal at 535 nm to the residual pump component is estimated as 12:1. The maximum output power ratio of the anti-Stokes Signal at 535 nm and the Stokes component at 865 nm is about 2:1. The maximum conversion efficiency of P a/P p0 in experiment can achieve up to 42%, and the possible reasons for discrepancy between experimental and theoretical results are analyzed. Moreover, the influences of other factors on experiment process are elementarily discussed.
Xinzhu Sang - One of the best experts on this subject based on the ideXlab platform.
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anti Stokes Signal conversion of femtosecond pulses at near ultraviolet wavelength in photonic crystal fibre
Electronics Letters, 2013Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Hongzhan Liu, Changming Xia, Kuiru Wang, Binbin Yan, Ying Han, Gerald Farrell, Lantian HouAbstract:Anti-Stokes Signals at the near-ultraviolet wavelength are efficiently generated based on degenerate four-wave mixing by coupling the femtosecond pulses into the fundamental mode of a photonic crystal fibre. When the pump pulses with the central wavelength of 840 nm and the average power of 300 mW are used, the conversion efficiency η s of the anti-Stokes Signal at 432 nm can be up to 40℅, and the pulse width is measured to be 42 fs by the Talbot effect.
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highly efficient anti Stokes Signal conversion by pumping in the normal and anomalous dispersion regions in the fundamental mode of photonic crystal fiber
Journal of Lightwave Technology, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Ying Han, Lantian HouAbstract:By pumping near the zero dispersion wavelength, the highly efficient anti-Stokes Signal conversions of the femtosecond pulses in the fundamental mode of photonic crystal fiber (PCF) with the zero dispersion wavelength of 848 nm have been achieved within the wavelength range of 644 to 543 nm. When the pump works at 820 nm, 830 nm and 840 nm with the average power of 500 mW, the power ratios of the anti-Stokes Signals at 594 nm, 581 nm, and 543 nm and the residual pump components are 9.8:1, 17.6:1, and 22.6:1, and the corresponding conversion efficiency η can be up to 33%, 39%, and 46%. When the pump works at 860 nm with the same power, the power ratio of anti-Stokes Signals at 553 nm and the residual pump components is 19.4:1 with η of 43%. In the experiment, because of low output powers of the trivial and residual pump components and high depletion of Stokes components, the output anti-Stokes Signal spectra appear much clearer, and the optical beams of Signals are with good qualities. The influences of pump power and wavelength interval between the working wavelength and zero dispersion wavelength of PCF on the Signal conversion are also demonstrated.
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highly efficient wavelength tunable anti Stokes Signal conversion by phase matched four wave mixing in the second order mode of photonic crystal fiber
Applied Physics B, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Xiangjun Xin, G Y Zhou, Lantian HouAbstract:Using the photonic crystal fiber (PCF) with zero dispersion wavelengths of the fundamental mode and the second-order mode at 985 nm and 885 nm designed and fabricated in our lab, the anti-Stokes Signals from 586.5 to 558 nm are efficiently generated in the second-order mode. When the pump working wavelength λ 0 increases from 830 to 880 nm and the input average power P in reduces from 43 to 25 mW, the output power of anti-Stokes Signal increases 1.76 times, the power ratio of anti-Stokes Signal at 558 nm to the residual pump component at 880 nm is estimated as 5:1, and the maximal conversion efficiency P as/P p0 can be up to 36%. The possible reasons for the difference from theoretical results are discussed. The combined effects of the interval between the pump working wavelength and zero dispersion wavelength and the input power on the Signal conversion process are analyzed.
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highly efficient and widely wavelength tunable anti Stokes Signal conversion in the fundamental mode of photonic crystal fiber
Optical Fiber Communication Conference, 2011Co-Authors: Jinhui Yuan, Xinzhu Sang, Cang Jin, Xiangjun XinAbstract:Anti-Stokes Signals from 645 to 543nm are generated in the fundamental mode. The power ratio of Signal at 543 nm to residual pump at 840 nm is 22.6∶1, the conversion efficiency P as /P p0 being above 45%.
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highly efficient wavelength tunable anti Stokes Signal conversion of femtosecond pulses in the fundamental mode of photonic crystal fiber
IEEE Journal of Quantum Electronics, 2010Co-Authors: Jinhui Yuan, Xinzhu Sang, Guiyao Zhou, Lantian HouAbstract:With the photonic crystal fiber (PCF) with the zero dispersion wavelength of fundamental mode around 830 nm designed and fabricated in our lab, the anti-Stokes Signals from 603 to 535 nm are efficiently generated in the fundamental mode by Ti:sapphire laser with central wavelength of 820 nm and pulse width of 150 fs. When the pump power increases from 80 to 320 mW in a separation of 40 mW, the output powers of anti-Stokes Signals increase 6 times, and the maximum power ratio of anti-Stokes Signal at 535 nm to the residual pump component is estimated as 12:1. The maximum output power ratio of the anti-Stokes Signal at 535 nm and the Stokes component at 865 nm is about 2:1. The maximum conversion efficiency of P a/P p0 in experiment can achieve up to 42%, and the possible reasons for discrepancy between experimental and theoretical results are analyzed. Moreover, the influences of other factors on experiment process are elementarily discussed.
W Ubachs - One of the best experts on this subject based on the ideXlab platform.
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statistical properties of the Stokes Signal in stimulated brillouin scattering pulse compressors
Physical Review A, 2005Co-Authors: I Velchev, W UbachsAbstract:Spontaneous scattering noise is incorporated as a build-up source in a fully transient stimulated Brillouin scattering (SBS) model. This powerful simulation tool is successfully applied for a quantitative investigation of the fluctuations in the output pulse duration of SBS pulse compressors. The predictions of this model are experimentally verified in a two-stage SBS compressor.
Michael S. Feld - One of the best experts on this subject based on the ideXlab platform.
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population pumping of excited vibrational states by spontaneous surface enhanced raman scattering
Physical Review Letters, 1996Co-Authors: Katrin Kneipp, Yang Wang, Harald Kneipp, Irving Itzkan, Ramachandra R Dasari, Michael S. FeldAbstract:We observed significant transfer of ground state population to the first excited vibrational state by spontaneous surface-enhanced Raman scattering (SERS) which can be explained by unexpectedly large SERS cross sections. Evidence for this pumping includes (i) anti-Stokes to Stokes ratios which exceed those expected from a Boltzmann distribution, (ii) a quadratic dependence of the anti-Stokes Signal on the excitation intensity, whereas the Stokes Signal remains linearly dependent, and (iii) a component of $\ensuremath{\nu}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ to $\ensuremath{\nu}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2$ Raman transitions in the SERS Stokes Signals.