ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Theoretical analysis of power generation in gasdynamic lasers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5231-5237 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The power generation in a gasdynamic laser (GDL) has been theoretically studied. Quasi-one-dimensional unsteady flow equations are numerically solved simultaneously with the rate equation for the laser intensity inside the laser cavity. Steady-state coupled solutions for the field variables and the laser intensity inside the GDL cavity are obtained by a time-dependent numerical technique. The laser intensity variations along the axis of the flow (across the laser cavity) are computed for different laser gas mixture compositions and reservoir conditions. The analysis predicts a sharp spike in the laser intensity at the leading edge of the laser cavity followed by a sharp fall from which it recovers to a uniform constant value for the lower H2O concentrations. It is shown that the H2O concentration above 2% in the CO2-N2-H2O gas mixture is detrimental to the power generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350232
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Power extraction studies in a gasdynamic laser (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3800-3806 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized two-dimensional flow-radiation coupled model to extract power from a gasdynamic laser is proposed. The model is used for the study of power extraction from a 9.4-μm CO2 downstream-mixing gasdynamic laser, where a cold CO2+H2 stream is mixed with a vibrationally excited N2 stream at the nozzle exits. This model is developed by coupling radiation with the two-dimensional, unsteady, laminar and viscous flow modeling needed for such systems. The analysis showed that the steady-state value of 9.4-μm intensity as high as 5×107 W/m2 can be obtained from the system studied. The role of H2 relaxant in the power extraction process has also been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348481
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Population inversions behind normal shock waves in CO2-N2-He mixtures seeded with solid particles: Further results (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1186-1187 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The analysis of propagation of a normal shock wave in CO2-N2-He or H2 or H2O system seeded with solid particles is presented. The variation of translational and vibrational temperatures of gas phase and the particle temperatures in the relaxation zone behind the shock front are given in graphical form. These results show that the peak value of population inversion and the width of the inversion zone are highest for He catalyst and lowest for H2O catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351801
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Analysis of light-induced processes in bacteriorhodopsin and its application for spatial light modulation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6108-6113 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simplified energy-level scheme is proposed for the photochemical cycle of the bacteriorhodopsin molecule. Rate equations are solved for the detailed light-induced processes based on this model and the intensity-induced population densities in various states of the molecule at steady state are computed which are used to obtain an analytic expression for the absorption coefficient of the modulation beam. Modulation of the probe laser-beam transmission by the modulation-laser-beam intensity-induced population changes is analyzed. It is predicted that for a probe beam at 412 nm up to 82% modulation can be achieved using a laser beam intensity of 3.2 W/cm2 at 570 nm. For temperatures ∼77 K, the transmission at 610 nm can be switched from zero to 81% for modulating laser intensity of 11 W/cm2. Construction of a spatial light modulator based on bacteriorhodopsin molecules is proposed and some of its features are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359136
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Analysis of a cascade-pumped 16 μm CO2-N2 downstream-mixing gasdynamic laser (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 852-854 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generation of a 16 μm laser beam through cascading in a downstream-mixing CO2 gasdynamic laser is studied. To simulate actual lasing action, a generalized, two-dimensional, flow-radiation-coupled power extraction model for a gasdynamic laser is used. Also, to model the cascade process a new four-mode CO2-N2 vibrational kinetic model has been proposed. The steady-state intensity obtained for an exclusive 9.4 μm transition is of the order of 5×107 W/m2. In the cascade mode of operation the steady-state intensities for 9.4 and 16 μm transitions of the order of 5×107 W/m2 and 1.0×106 W/m2, respectively, have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103386
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Dual wavelength CO2-N2-CS2 gasdynamic laser (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1379-1380 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method for producing simultaneous lasing at 10.6 μm and 38.3 μm in a CO2-N2-CS2 gasdynamic laser is presented. The theoretical analysis predicts small-signal gain values of the order 0.21 m−1 for 10.6 μm lasing in CO2 molecules and 0.085 m−1 for 38.3 μm lasing in CS2 molecules, indicating the possibility of dual wave lasing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99121
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Passive mode locking of lasers using bacteriorhodopsin molecules (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2776-2778 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Passive mode locking of lasers using the protein molecule bacteriorhodopsin which acts as a slow saturable absorber is proposed. Based on the self-consistent approach, expressions for the laser pulse energy and pulsewidth are derived. It is shown that mode-locked pulses of 64 fs duration and 7 nJ energy could be generated in the visible region by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111467
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Pulsewidth analysis in a mode locked internally frequency doubled Ti: sapphire laser (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5913-5915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theoretical analysis of internal frequency doubling in actively mode locked broadband solid state lasers is presented. The analysis is used to study the dependence of mode locked pulsewidth on the second harmonic conversion efficiency, the modulation depth, and the tuning element bandwidth in an AM mode locked Ti: sapphire laser. The results are presented in the form of graphs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354172
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Population inversions behind normal shock waves in CO2-N2-He mixtures seeded with solid particles (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3565-3571 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of a normal shock wave into the CO2-N2-He gas mixture seeded with solid particles is analyzed. The translation-vibration and vibration-vibration molecular energy exchange processes in the gas mixture are included in the analysis. The results indicate the creation of population inversions due to these processes in the relaxation region behind the shock wave for transitions at 50 and 22 μm in CO2 molecules. The presence of solid particles in the flow is found to be advantageous for observing the laser radiation behind the shock wave. Effects of the frozen shock Mach number, the particle size, the particle-to-gas mass loading ratio, and the laser gas mixture composition on the population inversions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345306
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    An analysis of pulse propagation through a saturable absorber having excited-state absorption (1987)
    Springer
    Optical and quantum electronics 19 (1987), S. 203-208 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The theoretical study of the propagation of a bell-shaped light pulse through a saturable absorber having excited-state absorption is presented. Assuming that the pulse-width is longer than the first excited-state lifetime of the absorber, a general expression for the steady-state transmission of the absorber is obtained. It is shown that when the excited-state absorption cross-section is larger than the ground-state absorption cross-section (reverse saturable absorber) the absorber acts as a power limiter. An explicit expression for the change of temporal pulse-width in a single transit through the absorber is obtained, which shows that the pulse-width increases due to the presence of excited-state absorption. An analytical expression is presented for the optimum pulse intensity at which the maximum pulse broadening occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02032514
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...