[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] The presentation addresses what stagger tuning is and how it effectively suppresses BBU on the DRHT-I accelerator.

[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 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] 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

No abstract available

[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] 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] Nature is rife with networks that are functionally optimized to propagate inputs to perform specific tasks. Whether via genetic evolution or dynamic adaptation, many networks create functionality by locally tuning interactions between nodes. Here we explore this behavior in two contexts: strain propagation in mechanical networks and pressure redistribution in flow networks. By adding and removing links, we are able to optimize both types of networks to perform specific functions. We define a single function as a tuned response of a single “target” link when another, predetermined part of the network is activated. Using network structures generated via such optimization, we investigate how many simultaneous functions such networks can be programed to fulfill. We find that both flow and mechanical networks display qualitatively similar phase transitions in the number of targets that can be tuned, along with the same robust finite-size scaling behavior. We discuss how these properties can be understood in the context of constraint–satisfaction problems.

[en] Minimizing the CEP jitter of isolated attosecond pulses (IAP) will be important for future applications. This jitter is experimentally and theoretically investigated and can be minimized when the driving pulse is near its Fourier limit but with slightly negative chirp. Thus, understanding and characterization of the CEP jitter of IAPs is a first step towards exact control of the electric field of IAP pulses.