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  • Springer  (398)
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  • 2015-2019  (398)
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  • Physik  (398)
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  • 1
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    Erratum to: Atomic “bomb testing”: the Elitzur–Vaidman experiment violates the Leggett–Garg inequality (2017)
    Springer
    Details
    Publikationsdatum: 2017-03-18
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
    Publiziert von Springer
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  • 2
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    Making unpolarized light sensitive to polarization-sensitive devices (2017)
    Springer
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    Publikationsdatum: 2017-03-18
    Beschreibung: Here we propose a novel scheme in which depolarized or unpolarized light can respond to polarization-dependent optical elements such as an input-polarization-dependent wavelength-selective filter. An optical apparatus for realizing the proposed scheme consists of a polarization beam splitter, two Faraday rotators, and four waveplates. By harnessing the polarization decomposition/superposition property of a polarization-diversity loop and the irreciprocity of optical Faraday rotation, we could make unpolarized light selectively excite one of the two principal axes of a polarization-dependent element like polarized one while maintaining the unpolarized nature. The principle of operation of this apparatus was theoretically analyzed through the investigation of the polarization variation of light passing through the optical elements comprising it. Then, its polarization-selective feature was experimentally verified by employing a long-period fiber grating inscribed on polarization-maintaining fiber, which had polarization-dependent spectral dips with different resonance wavelengths, as a polarization-dependent element in the polarization-diversity loop. One of the two spectrally separated resonances of the grating could be freely chosen through the proper control of the waveplates in the apparatus.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
    Publiziert von Springer
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  • 3
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    Acousto-optic collinear filter with optoelectronic feedback (2017)
    Springer
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    Publikationsdatum: 2017-03-20
    Beschreibung: A spectral optoelectronic system combining a collinear acousto-optic cell fabricated of calcium molybdate single crystal and a positive electronic feedback is proposed first and examined theoretically and experimentally. The feedback signal is formed at the cell output due to the optical heterodyning effect with the use of an unconventional regime of cell operation. It is shown that the feedback enables controlling spectral characteristics of the acousto-optic cell, resulting in enhancing the spectral resolution and the accuracy of optical wavelength determination. In the experiment, maximal filter passband narrowing was as great as 37 times.
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    Thema: Physik
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  • 4
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    T 3 -Interferometer for atoms (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: The quantum mechanical propagator of a massive particle in a linear gravitational potential derived already in 1927 by Kennard [ 2 , 3 ] contains a phase that scales with the third power of the time T during which the particle experiences the corresponding force. Since in conventional atom interferometers the internal atomic states are all exposed to the same acceleration a , this \(T^3\) -phase cancels out and the interferometer phase scales as \(T^2\) . In contrast, by applying an external magnetic field we prepare two different accelerations \(a_1\) and \(a_2\) for two internal states of the atom, which translate themselves into two different cubic phases and the resulting interferometer phase scales as \(T^3\) . We present the theoretical background for, and summarize our progress towards experimentally realizing such a novel atom interferometer.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
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  • 5
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    Mode locking based on the temporal Talbot effect (2017)
    Springer
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    Publikationsdatum: 2017-03-19
    Beschreibung: We propose a new laser mode locking state in which the pulse disperses quickly and then revives after a certain time. This mechanism is based on the temporal Talbot effect and requires a large amount of intra-cavity group velocity dispersion. Similar to the usual mode locking it should be possible to employ the Kerr effect to force the laser into this mode, even when the cold cavity dispersion is not exactly matched. We show that the mode spectrum of such a laser is not equidistant but increases linearly with very high precision. This Talbot frequency comb can be self referenced. The beating with the adjacent modes uniquely defines the optical mode frequency, which means that the optical spectrum is directly mapped into the radio frequency domain. This is similar to the dual frequency comb technique, albeit without the limiting relative jitter between two combs.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
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  • 6
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    High-power linearly polarized diode-side-pumped a-cut Nd:GdVO 4 rod laser (2017)
    Springer
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    Publikationsdatum: 2017-02-23
    Beschreibung: An efficiently high-power diode-side-pumped Nd:GdVO 4 rod laser system was successfully demonstrated, operating in continuous wave (CW) and acousto-optically (AO) Q-switched regime. With a 65 mm-long a-cut Nd:GdVO 4 crystal, a maximum linearly polarized CW output power of 60 W at 1063.2 nm was obtained under an absorbed pump power of 180 W, corresponding to a slope efficiency of 50.6%. The output laser beam was linearly polarized with a degree of polarization of 98%. In AO Q-switched operation, the highest output power, minimum pulse width, and highest peak power were achieved to be 42 W, 36 ns, and 58 kW at the pulse repetition frequency of 20 kHz.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
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  • 7
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    Directional energy focusing on monolayer graphene coupling system (2017)
    Springer
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    Publikationsdatum: 2017-02-27
    Beschreibung: A directional energy focusing system based on parallel-monolayer graphene sheets is proposed and is analytically and numerically investigated in this paper. By properly designing the chemical potential distributions, we obtain a \(\sim\) 0.8-nm-size focusing point at desired positions with energy enhancement factor of over 2410. The flexible tunability of the transmission properties enables us to shut one parallel pair propagation down and guide the waves to the other branch. The light signal at the focal point is efficiently slowed down to over 10,000 times the speed in vacuum as well. The proposed structure may find potential applications in integrated circuits, on-chip systems or energy storage.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
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  • 8
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    Systematic design of highly birefringent photonic crystal fibers (2017)
    Springer
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    Publikationsdatum: 2017-03-01
    Beschreibung: This article systematically designs and theoretically investigates a highly birefringent photonic crystal fiber (HB-PCF) for reducing the effect of polarization mode dispersion in high-speed optical communication system. To achieve a high modal birefringence in the proposed HB-PCF, four types of HB-PCF were designed by adding some birefringence-enhancing factors step by step in sequence. Ultimately, as per the simulation results, in the condition of single-mode operation, the numeric values of modal birefringence and confinement loss of the proposed HB-PCF is about 21.85 × 10 − 3 and 0.47 dB/km at the habitual wavelength λ  = 1.55 µm of optical-fiber communications.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
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  • 9
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    Erratum to: Spatial–temporal gain distribution of a CuBr vapor brightness amplifier (2017)
    Springer
    Details
    Publikationsdatum: 2017-03-01
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
    Publiziert von Springer
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  • 10
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    Practical correction of a phase-aberrated laser beam using a triphenyldiamine-based photorefractive composite (2017)
    Springer
    Details
    Publikationsdatum: 2017-03-06
    Beschreibung: A photorefractive composite based on a triphenyldiamine (TPD) derivative was used to restore a severely phase-aberrated laser beam to a nearly aberration-free state. Here, a forward degenerate four-wave mixing geometry was employed for the elimination of phase distortions and its practical applicability in the transmission of optically encoded data is demonstrated. In addition, it is demonstrated that the experimental geometry is able to effectively restore dynamically updating images. Conventional two-beam coupling and degenerate four-wave mixing experiments were used to characterize the composite subject to the current experimental setup. The two-beam coupling net gain coefficient was 100 cm −1 with an applied external electric field of 70 V/µm. Internal and external diffraction efficiencies of 10 and 6%, respectively, were observed with a similar external electric field. Due to its superior charge-carrier mobility, the TPD-based composite exhibited a response time of 0.28 s, approximately five times faster than traditional PVK-based composites.
    Print ISSN: 0946-2171
    Digitale ISSN: 1432-0649
    Thema: Physik
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