Power Scaling of a Q-switched laser designed for internal frequency conversion is demonstrated by combining two Nd:YVO4-gain-channels with a time-multiplexing scheme based on a single crystal photo elastic modulator (SCPEM). Both channels are coupled with a polarizer and share an output-coupler and acousto-optic modulator (AOM). In order to combine two channels by time multiplexing, the single ...

The bERLinPro project [1], under construction at HZB, is a 100 mA, 50 MeV superconducting RF (SRF) energy recovery linac (ERL) being built to study the accelerator technology and physics of operating a high current SRF ERL. For this high current operation, coaxial RF power couplers capable of handling 115 kW of power (per coupler, dual couplers per cavity), continuous wave (cw) at 1.3 GHz are r...

Abstract— This paper presented the design of four-port network directional coupler at X-band frequency (8.2-12.4 GHz) by using substrate integrated waveguide (SIW) technique. SIW appears few years back which provides an excellent platform in order to design millimeter-wave circuits such as filter, antenna, resonator, coupler and power divider. It offers great compensation for smaller size and c...

A combined system to support simultaneous two way mutual pulse injection-seeding and active mode-locking schemes for wavelength tunable optical short pulse generation is presented. The system consists of two gain-switched Fabry-Pérot laser diodes, a bidirectional erbium-doped fiber amplifier, and a tunable optical filter and a coupler. The optical pulses generated exhibits a good stability, a h...

Linear and nonlinear directional couplers are currently used in fiber optics communications. They may also play a role in multiphoton approaches to quantum information processing if accurate control is obtained over the phases and polarizations of the signals at the output of the coupler. With this motivation, the constants of motion of the coupler equation are used to obtain an explicit analyt...

We study spatial and temporal solitons in the PT symmetric coupler with gain in one waveguide and loss in the other. Stability properties of the highand low-frequency solitons are found to be completely determined by a single combination of the soliton’s amplitude and the gain-loss coefficient of the waveguides. The unstable perturbations of the high-frequency soliton break the symmetry between...

Erbium-doped aluminum oxide channel waveguides were fabricated on silicon substrates and their characteristics were investigated for Er concentrations ranging from 0.27 to 4.2 × 10 cm. Background losses below 0.3 dB/cm at 1320 nm were measured. For optimum Er concentrations in the range of 1 to 2 × 10 cm, internal net gain was obtained over a wavelength range of 80 nm (1500-1580 nm) and a peak ...

Planar directional coupler using Substrate Integrated Waveguide technology (SIW) is proposed in this paper. The SIW coupler with tapered microstrip-SIW transitions are integrated on the same substrate. Planar form makes this coupler structure easily integrable in microwave planar circuits. These proposed power dividers can be applied to the design of the beam-forming network for communication s...

The objective of this project was the development and performance optimisation of a coupling application. The coupler library is intended for interfacing massively-parallel algorithms for multi-physics simulations. The development of the coupler library adopted the same philosophy of the Message Passing Interface (MPI) library: The coupler was engineered as a set of libraries that are accessibl...

For high-power operation of charged particle rf accelerators, the input coupler windows must withstand enormous stresses due to charging induced by the highenergy charged particle beam passing by and high rf power passing through. Since most couplers use a single coupling aperture, harmful asymmetrical rf kick on the beam at the coupler-cavity interface exists. If this problem is solved by dual...