Saturable absorber mirrors (SAMs) are grown by low-temperature solid-source molecular beam epitaxy. The nonlinear absorber layer consists of one InGaAs quantum well. The devices have response times shorter than 10 ps and small non-saturable losses (less than 0.3%). SAMs with modulation depths between 0.6% and 2.0% were used to mode lock a Yb:KYW laser at around 1040 nm. The minimum achievable p...

The hybrid action of quantum-dot saturable absorber and Kerr-lens mode locking in a diode-pumped Yb:KGW laser was demonstrated. Using a quantum-dot saturable absorber with a 0.7% (0.5%) modulation depth, the mode-locked laser delivered 90 fs (93 fs) pulses with 3.2 W (2.9 W) of average power at the repetition rate of 77 MHz, corresponding to 462 kW (406 kW) of peak power and 41 nJ (38 nJ) of pu...

We report a naked eye refractive index sensor with a visible metamaterial absorber. The visible metamaterial absorber consisting of a silver dendritic/dielectric/metal structure shows multiple absorption peaks. By incorporating a gain material (rhodamine B) into the dielectric layer, the maximal magnitude of the absorption peak can be improved by about 30%. As the metamaterial absorber is sensi...

Wave energy resources are enormous and widely distributed worldwide evaluated as to replace fossil fuels. One of the methods collect wave is using a point absorber device, which device designed react sensitively movement water surface for harnessing energy. This paper about influence fixed breakwater on Wavestar-shaped pivoted converter (WEC) computational fluid dynamics (CFD). The may generate...

The microwave absorbers are extensively applied in many military and civilian applications for stealth, camouflage, radar cross section (RCS) reduction, and improvement purpose of the inroom EM wave environment in anechoic chambers and indoor wireless LAN area. Although the absorbers can be categorized to many types, it is well known that more useful device in those areas is the resonant type m...

Wave energy is nowadays one of the most promising renewable sources; however, wave technology has not reached fully-commercial stage, yet. One key aspect to achieve this goal identify an effective control strategy for each selected Energy Converter (WEC), in order extract maximum from waves, while respecting physical constraints device. Model Predictive Control (MPC) can inherently satisfy thes...

To offer point absorber wave energy converters (WECs) as a bankable product on the marine renewable market, multiple WECs will be installed together in an array configuration. The community (research and industrial) has identified urgent need for available realistic reliable data WEC tests order to perform better optimization approach validate recently developed (non-linear) numerical models. ‘...

In studies of wave energy, notably those made under contract to the U.K. Department of Energy, capital costs have generally been _found too high to compete with other sources It has been shown elsewhere (1) that the large structural element in these costs can be avoided by using point-absorbers reacting against an internal moving mass. This early proposal (2) suffers from the disadvantage that ...