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We proposed a microring-based FBG-like filter using an ADM and a deeply etched Bragg grating. It helps select a wavelength for controlled reflection and sharp rejection. Filter bandwidth is determined by the resonator Q which is not affected by the reflector attachment. It can be readily applied to external cavity and microring lasers. Its structure is fully compatible with standard CMOS processes...
High intense, carrier envelope phase locked, few-cycle laser pulse train is an Ideal tool in number of studies such as generation of coherent super-continuum like spectrum in extreme ultra-violet region through high-harmonic generation [1] and electric field induced physical changes in dielectrics [2].
In the SG-II upgrade project, a petawatt-class beamline is included for fundamental physics and advanced applications. Recently, an elliptical beam was employed for maximum energy while using pulse compression gratings with a size of 380mm×430mm and far-field fluence measurements were achieved in the target chamber.
The SG-II-UP laser facility, which is being constructed in shanghai, China, contains eight identical beamlines. It is designed to deliver 40KJ at 1053 nm at 3ns and 24KJ at 351nm at 3ns with the output beam aperture 310mm×310mm.
We present a GaSb-VCSEL concept using SOI-based HCGs as highly reflective mirrors. The optical properties of two different grating designs are simulated using RCWA. These gratings show strong and broadband reflection around 2.3 µm.
We demonstrate the transverse-mode control of 980nm VCSELs using highly angular dependent HCG mirrors. The fabricated a-Si HCG clearly shows the large angular dependence of reflectivity, which enables single transverse-mode operations of large-area VCSELs.
Recently we demonstrated a novel type of hybrid silicon laser based on resonant grating cavity mirrors. The first optically-pumped proof-of-principle device measures 2µm by 55µm, requires milliWatt-level threshold power and has a side-mode suppression ratio of 39 dB. In this work we discuss the challenges and propose a scheme for porting the concept to an electrically pumped device. The novel implementation...
We demonstrate phase conjugate wave generation using divergent spherical wave, for the first time, in semiconductor gain medium. We find that the phase conjugate reflectivity increases with an increase in optical feedback power.
We propose a new design for buried heterostructure photonic crystal nanocavity lasers with in-line coupled output waveguides and coupling buffer regions. This design enables us to realize single-mode lasing and a high output power for a current-injected nanolaser.
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