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  • 1
    Electronic Resource
    Electronic Resource
    Angle tuning characteristics of second-harmonic generation in KTiOPO4 (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1943-1945 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The angle tuning characteristics of second-harmonic generation in KTP were experimentally demonstrated using stimulated Raman light in a single-mode fiber as a fundamental light source. The type II phase-matching condition for second-harmonic generation in the y-z plane can be satisfied over the range 1.06 –1.85 μm by varying the incident angle in the θ direction by 29°. The acceptance angles in the θ direction for type I and type II interactions were also measured. These experimental results agreed well with the theoretical values. It is also found that the effective nonlinear coefficient for type I interaction obtained experimentally is larger than the calculated value from nonlinear coefficients of the crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102333
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of walk-off and group velocity difference on the optical parametric generation in KTiOPO4 crystals (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4941-4947 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of walk-off and group velocity difference on the optical parametric generation in KTiOPO4 crystals are numerically revealed. These calculations treat the transverse-mode profile and the temporal pulse shape of the interaction pulses simultaneously. Combining calculations with experimental results, the values of a second-order nonlinear coefficient and two-photon absorption coefficient at 0.6 μm are obtained as d24=4.2 pm/V and 0.35 pm/W, respectively. Due to the back-conversion, the maximum conversion efficiency with a 5-mm-length crystal is limited to about 10%. This is because the beam diameter and the pulse duration of the signal and idler fields become small in the propagation and interaction with the pump field cannot take place at the entire portion of the pump field. The calculation results also indicate that 280 fs output pulses are obtained from a 1 ps pump pulse by the pulse narrowing effect. It is also clarified that the back-conversion causes depression and splitting of the transverse mode and walk-off plays an important role in the transformation of the transverse-mode profile. The depression and splitting can be suppressed by using a short-length crystal or decreasing pump intensity. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359300
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  • 3
    Electronic Resource
    Electronic Resource
    Transverse beam profiles on traveling-wave optical parametric generation in KTiOPO4 crystals (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6361-6366 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transverse beam profiles on traveling-wave optical parametric generation in KTiOPO4 crystals pumped by short optical pulses are investigated. The transverse beam profile deformation and splitting due to the back-conversion in the traveling-wave parametric propagation process is clarified for the first time from experimental observations and calculations. The transverse beam profile becomes ring shaped when there is no walk-off and deforms by expanding to the walk-off direction when walk-off exists. The deformation of the profile can be reduced by using a short crystal or decreasing the pump intensity due to the subsequent reduction in back-conversion. However, in these cases, the conversion efficiency becomes very low (3%–4%). We can improve the conversion efficiency while keeping good transverse beam profiles by using the two-crystal beam overlapping technique. The optimum conditions for this technique are clarified through calculations and it is shown that conversion efficiency of more than 18% can be achieved when they are used. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360517
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  • 4
    Electronic Resource
    Electronic Resource
    Enhanced K-shell x-ray line emissions from aluminum plasma created by a pair of femtosecond laser pulses (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 24-26 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of an ultrashort prepulse on K-shell x-ray line emissions from Al plasma produced by 100 fs Ti:sapphire laser pulses is studied. By introducing an independent 100 fs prepulse, a more than 20-fold enhancement in K-shell emission was achieved. We could experimentally optimize Kα and Heα line emissions. In case of oblique incidence, resonance absorption made it possible to maximize Kα emission while keeping pulse duration short. On the other hand, Heα line emission was maximized when a separation between two laser pulses was large, resulting in pulse broadening (∼30 ps). © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1383571
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  • 5
    Electronic Resource
    Electronic Resource
    Greatly enhanced soft x-ray generation from femtosecond-laser-produced plasma by using a nanohole-alumina target (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 4079-4081 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By making an array of nanoholes on an alumina target, x-ray emission from laser-produced plasma can be greatly enhanced even in soft x-ray energy regions (〈0.25 keV). X-ray fluence enhancement around 30 times was achieved in the 5–25 nm wavelength range. The enhancement increases as the ionization level of Al becomes higher and the x-ray wavelength becomes shorter. Over 50-fold enhancement was obtained at a soft x-ray wavelength around 6 nm, which corresponds to the emission from Al8+,9+ ions. X-ray pulse duration was 17 ps, which is much shorter than that obtained by using the prepulse technique. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125542
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  • 6
    Electronic Resource
    Electronic Resource
    Cross-correlation measurement of ultrashort soft x-ray pulse emitted from femtosecond laser-produced plasma using optical field-induced ionization (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 4506-4508 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We propose a cross-correlation technique for measuring ultrashort soft x-ray pulse shapes using the rapid increase in Kr+ ion density caused by optical field-induced ionization, which operates as an ultrafast x-ray absorption switch. Using this technique, we measured the shape of a soft x-ray pulse near 15.6 nm emitted from W plasma produced by a 100 fs laser pulse, and found the duration to be about 4 ps assuming a Gaussian pulse. This result was in good agreement with the duration measured with an x-ray streak camera thus confirming the feasibility of our technique. The temporal resolution of this technique has the potential to overcome the limitation of the ionizing pulse duration. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1430506
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  • 7
    Electronic Resource
    Electronic Resource
    Time-resolved soft x-ray absorption spectroscopy of silicon using femtosecond laser plasma x rays (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2350-2352 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We measured time-resolved soft x-ray absorption of photoexcited silicon by means of pump-probe spectroscopy, using a picosecond soft x-ray pulse from femtosecond laser-produced plasma as a probe. We observed a 5% increase in the absorption caused by 1010 W/cm2 intensity laser pulse irradiation near the LII,III edge at 100 eV. The change was observed only when the laser and the soft x-ray pulses overlapped on the sample both in time and space. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125011
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  • 8
    Electronic Resource
    Electronic Resource
    X-ray generation enhancement from a laser-produced plasma with a porous silicon target (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1653-1655 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray generation enhancement from a laser-produced plasma with a porous Si target is reported. For a porous surface formed on a Si wafer, the self-reflectivity of a femtosecond pulse becomes considerably small. The observed energy penetration depth is 25–30 μm, which is much larger than the skin depth of solid density matter. Using a porous Si target, the threshold of the pre-pulse intensity required for soft x-ray emission enhancement can be reduced. It also contributes to enhance the pre-pulse effect, and soft x-ray generation enhancement ranging from 1.6 to 6.5 times is observed depending on the pre-pulse intensity. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118660
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  • 9
    Electronic Resource
    Electronic Resource
    Pulse narrowing characteristics in traveling-wave optical parametric generation in KTiOPO4 crystals (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 2589-2594 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulse narrowing characteristics in traveling-wave optical parametric generation in KTiOPO4 crystals are investigated. By utilizing the pulse narrowing effect, output pulses with pulse duration of 250 fs can be obtained from 550 fs pump pulses in the experiment. It is also demonstrated that when the conversion efficiency becomes large by increasing the pump intensity or by changing the phase-matching angle, the pulse narrowing effect becomes small. These tendencies are confirmed by numerical calculations of the parametric propagation process, which include the effects of temporal pulse shape, group-velocity difference, transverse beam profile, walk-off, two-photon absorption, and depletion. The theoretical results indicate that when the conversion efficiency becomes greater than 1%, the back-conversion process becomes large at the high-intensity part of the signal and idler pulses. This causes the pulse width to increase and reduces the pulse narrowing effect. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363174
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  • 10
    Electronic Resource
    Electronic Resource
    Pulse propagation of accumulated photon echoes in Nd3+ ion-doped silicate glass fiber (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1613-1615 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulse-propagation phenomena of accumulated photon echo signals was investigated for the 4F3/2(1)–4I9/2 transition of the Nd3+ ion doped with 20 ppm concentration in silicate glass fiber (core diameter of 6 μm) at 4.2 K using an 82 MHz mode-locked dye laser. The intensity of the transmitted probe pulses from the Nd3+ fiber was measured as a function of the Nd3+ fiber length. The fiber length for the maximum probe-pulse intensity induced by the pump pulses was determined to be 4 m when the pump pulses of 0.50 mW average power and the probe pulses of 0.25 mW average power were used. We derived the pulse area equations which take into account the coherent interaction between the pulses and the Nd3+ fiber. The fiber-length dependence of the signal intensity was explained well by the pulse area equations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119994
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