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Silicon nano-patterned membrane reflectors - Si-MR (2-dimensional photonic-crystal slabs) hold many promising applications in photonic integrated circuits and can be used as ultra-compact mirrors [1] with controlled spectral response [2]. Built entirely from dielectric materials, such membrane reflectors can have very low losses and therefore can deliver near-100% reflectivity both in narrow and wide-band...
We demonstrate the generation of low divergence, spatially coherent, high-order harmonics (orders ranging from 23rd to 95th) using commercial sub-TW laser system. The 6 mJ, 32 fs laser pulses were loosely focused with f/125 concave mirror in a semi-infinite gas cell. The beam divergence was measured to be 0.18-mrad at the 59th harmonics (13.5 nm) in 18kPa of helium. The 59th harmonics with novel high-throughput,...
We report on the fabrication of photopolymerizable polymer nanocomposites dispersed with semiconductor CdSe quantum dots as high as 0.91 vol.% (3.6 wt.%) and on their nonlinear optical responses measured by degenerate multi-wave mixing with a 532-nm picosecond laser. We show that multi-order self-diffracted beams are induced in a uniformly cured composite film, indicating that the composite film possesses...
We built a compact, common path, laser epi-illumination diffraction phase microscope (epi-DPM) for defect detection on a patterned semiconductor wafer. The wafer's underlying structure and buried defects with ∼ 100 nm size were measured.
Modeling results for lateral-longitudinal mode discrimination in longitudinally inhomogeneous finite-length waveguides of ridge lasers are presented, obtained by numerical solutions of the wave equation and calculations of the mode thresholds, predicting high-brightness single-mode output of wide stripes.
Peak Power above 1 PW was obtained from a femtosecond Ti:sapphire laser facility based on DCPA technique. With optical parametric amplification clean the seeding pulse, we measured contrast ratio up to 1010 in picosecond range.
The recent technical progress on the femtosecond petawatt Ti:sapphire laser are presented, which include the peak power (1.26PW) and temporal contrast (∼1011) enhancement. Further, the significant applications achieved from the petawatt laser facility are summarized.
The SG-II upgrade laser facility includes a Petawatt beamline for fundamental physics and advanced applications, which requires large pulse compression gratings. Since it is exhausted to fabricate large size diffraction grating which can meet the stringent requirements of the PW beamline, an elliptical beam is employed firstly for maximum energy while using pulse compression gratings with a size of...
We proposed a novel method to fabricate liquid-core photonic crystal fibers by utilizing a ring-core hollow optical fiber, which could overcome the previous structural limitation, enhance the light coupling efficiency, and prevent the liquid evaporation.
We review the technique of spectral beam combining and discuss detailed limitations in the laser systems used for combination of multiple cw and pulsed fiber amplifiers to kW average power and mJ's of pulse energy.
Adiabatically flared slab-coupled optical waveguide lasers (SCOWLs) at 1.06 µm wavelength have been studied, achieving a large fundamental mode and a 32% increase in COD power. Capabilities and limitations of the taper mechanism are discussed.
The laser light reflection intensity on human skin varies depending the ethnicity of each person, in this paper we present an analysis of reflection intensity and how affects the measurement of some optoelectronic devices.
We have demonstrated a novel optical-parametric chirped-pulse amplification scheme with diverged pump beam for ultraboradband phase-matching. Over 400nm ultrabroadband amplified pulses was successfully obtained at 1000 nm center wavelength with a gain of 1.2×105.
Femtosecond mid-IR pulses were coupled into a quantum cascade laser. The spectral broadening and far-field profile of the transmitted pulses showed an intensity dependence. n2 was experimentally estimated to be on the order of ∼10−9cm2/W.
A hybrid silicon laser with an on-chip optical phased array for 1D beam steering across a 12° field of view is demonstrated. The device achieved 7 dB background suppression and 1.8° × 0.6° beam width.
A single frequency, mode hoping free, narrow linewidth laser system has been developed to generate high repetition rate picosecond UV pulses with MW peak power. Preliminary measurements have shown the generation of 402.5MHz/80ps pulses at high extinction ratio and single frequency operation. The laser parameters are promising in the application of laser assisted H− beam stripping at the Spallation...
All-fiber Bessel-like beam generator achieved optical trapping and displacement control of micron particles. A pair of generators being compatible with lab on a chip system can be good tools for manipulation and analysis of bio-sample.
A technique for full spatio-temporal characterization of impulse responses of optical systems with an almost one-wave-cycle temporal resolution was developed. It was employed to characterize ultrashort Airy-Bessel light bullets generated by a circular diffraction grating.
We demonstrate a monolithic 10nm tunable integrated laser on a QW structure. Wavelength switching is achieved by steering an optical gain media laterally over two adjacent quantum well regions selectively intermixed to varying extents.
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