Results 1 - 10 of 5684
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[en] We theoretically investigate how the generation of attosecond pulses from high-order harmonics can be controlled by using a specially designed sequence of gas jets. We demonstrate that quasi-phase-matching provided by such a multi-jet system can be limited to a sub-femtosecond time window, while adjusting the multi-jet structure allows tuning of the central frequency of the generated isolated attosecond pulse
[en] A method is discussed which provides, for the first time, broad band (hundreds of A) electronic tuning of the cw dye laser and data are given to verify the method. The method is electro-optical in nature. Various crystal orientations and their corresponding tuning rates (in A per kilovolt) are given. Basic filter characteristics (bandwidth, free spectral range) and resultant laser emission characteristics are also discussed
[en] We show how to improve the molecular dynamics step of Hybrid Monte Carlo, both by tuning the integrator using Poisson brackets measurements and by the use of force gradient integrators. We present results for moderate lattice sizes. We have presented a novel way of tuning an integrator, together with a practical example using a moderate lattice size. This tuning procedure can be used for all lattice gauge and fermionic actions. We are working towards a general implementation of the calculation of Poisson brackets and force gradient terms in Chroma. In the near future we will consider the tuning of HMC simulations on larger lattices and smaller quark masses, and we will also consider other widely used lattice actions.
[en] A laser in which one of the two reflectors at the ends of the laser assembly is in the form of a roof prism, the other or second reflector being conventional is described. A Fabry-Perot etalon is arranged between the second reflector and the laser cell, the etalon being tiltable about an axis which is at either 450 to or parallel to an axial plane containing the apex line of the roof prism. An optically active plane parallel plate is located between the etalon and the laser cell, in one embodiment, or between the laser cell and the roof prism, in another embodiment
[en] This paper presents details on a previously proposed method for mechanically tuning the accelerating gap capacity, offering a fairly wide tuning range. The paper presents two possible ways to capacitively tune the cavity by means of a mechanical tuning mechanism
[en] We propose how to realize a three-step controlled-phase gate of one qubit simultaneously controlling n qubits in a cavity or coupled to a resonator. The n two-qubit controlled-phase gates, forming this multiqubit phase gate, can be performed simultaneously. The operation time of this phase gate is independent of the number n of qubits. This phase gate controlling at once n qubits is insensitive to the initial state of the cavity mode and can be used to produce an analogous cnot gate simultaneously acting on n qubits. We present two alternative approaches to implement this gate. One approach is based on tuning the qubit frequency while in the other method the resonator frequency is tuned. Using superconducting qubits coupled to a resonator as an example, we show how to implement the proposed gate with one superconducting qubit simultaneously controlling n qubits selected from N qubits coupled to a resonator (1< n< N). We also give a discussion on realizing the proposed gate with atoms, by using one cavity initially in an arbitrary state.
[en] The disclosure is concerned with exciplex dye lasers, i.e., lasers in which the emitting species is a complex formed only from a constituent in an electronically excited state. Noting that an exciplex laser, favorable from the standpoint of broad tunability, results from a broad shift in the peak emission wavelength for the exciplex relative to the unreacted species, a desirable class resulting in such broad shift is described. Preferred classes of laser media utilizing specified resonant molecules are set forth. (auth)
[en] An electro-optic diffraction grating tuned laser comprising a laser medium, output mirror, retro-reflective grating and an electro-optic diffraction grating beam deflector positioned between the laser medium and the reflective diffraction grating is described. An optional angle multiplier may be used between the electro-optic diffraction grating and the reflective grating. (auth)
[en] We develop an efficient scheme for controllably generating electromagnetically induced transparency (EIT) with a superconducting qutrit driven by tunable drivings. At an optimal bias point, the first three level states of a charge-phase quantum circuit constitute our qutrit. Allowed by the level transition rule, V- and -type interactions between the qutrit and driving fields can be obtained individually. By the technique of density matrix, we analytically derive and numerically address two cases of EIT for an identical probe field only by tuning the frequency of control driving. Thanks to the tunable interactions within the qutrit having sufficient level anharmonicity, our strategy offers a promising approach to generate EIT in a controllable manner, which could be highly preferable to experimentally investigate EIT with superconducting artificial atoms. (letter)