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We convert higher order fiber modes into Gaussian beams using binary phase plates, and characterize the resulting M2 and coupling efficiency to single-mode fiber (∼64%). Reciprocally, the system is used to excite modes in multi-mode fiber with purity >13dB.
We present techniques for measuring the damage performance of a variety of optical components with ps laser pulses, introduce a novel beam diagnostic technique, and explore the sensitivity of damage resistance to laser spot size for the case of high-reflectivity, multilayer dielectric (MLD) mirrors.
The nonlinear absorption was studied for compounds linking tricycloquinazoline to a number of iridium groups. It was determined that the excited-state cross section was highest for the compound with a single iridium group.
We design, fabricate and experimentally demonstrate a novel generic method to detect flow rates velocity in microfluidic devices. The method is appealing for variety of applications where a simple and accurate speed measurement is needed.
A 1053-nm laser beam profile was controlled using the diffractive mode of a spatial light modulator in closed loop for the first time, producing high-contrast spatial intensity shaping, as well as independent wavefront control.
We demonstrate an ultra-low-NA (∼0.038) Yb-doped step-index-fiber fabricated using conventional MCVD and solution-doping process. The fiber ensures ∼700μm2 Aeff for effective-single-mode operation and 81% laser efficiency with M2 ∼1.1 at a bend diameter of 32cm.
Measuring the continuum polarization against pulse ellipticity of a laser filament is introduced as a new paradigm for quantifying nonlinearities in filamentation such as ionization paths, molecular alignment, nonlinear index and field intensity.
We present preliminary results on using photo-thermal effects for gas composition analysis. Proof-of-concept experiments will be discussed and several unique detection schemes will be presented.
We demonstrate that average orbital angular momentum (OAM) can be measured with a simplified twist parameter measurement technique. This technique uses a stationary apparatus composed of only a cylindrical lens and a CCD.
Pulse-front-tilt and negligible pulse-width spread across the laser beam are reported, both experimentally and numerically, for pulses from a Q-switched unstable resonator with a variable-reflectivity-mirror under different operation conditions.
We demonstrated that depositing HfO2 film on graphene nanoribbons greatly enhance the mobility through weakening the Coulombic interactions. As a result, the graphene nanoribbon photodetectors with HfO2 layer exhibits high responsivity of ∼2A/W at room temperature.
We report on a variety of Bell tests performed with a high-quality photonic entanglement source. These tests begin to quantify nonlocal resources available in quantum mechanics, as well as place bounds on beyond-quantum theories.
We demonstrate Hong-Ou-Mandel interference between different transverse spatial modes in a silicon nitride multimode waveguide. We show over 90% visibility between modes, providing a promising route for scalable on-chip quantum information processing.
We present the first semiconductor disk laser simultaneously emitting two gigahertz modelocked pulse trains. This simply allows to establish a link from the optical domain to a microwave frequency comb. The relative carrier-envelope-offset frequency can be accessed directly.
Optimum design of high-energy parametric down-conversion schemes mandate investigation of nanosecond laser-induced damage threshold in KTiOPO4 and Rb:KTiOPO4 at 1.064 μm and 2 μm. A surface damage threshold of 10 J/cm2 at 2 μm was determined for both materials.
We demonstrated CW SHG at 400 nm in a first-order QPM adhered slab waveguide with a periodically-poled Mg-doped stoichiometric lithium tantalate core. The measured SHG normalized conversion efficiency was 34.7%/W for a 20 mm length.
We design and experimentally demonstrate a free-space distance emulator for propagating OAM beams over long distances in a lab environment. The performance of the system is assessed by measuring spot radius and radius of curvature of propagated beams.
We demonstrate a versatile vortex linear light bullet as a vortex Airy-Bessel wave packet for the first time. Its non-varying three-dimensional (3D) vortex field in linear propagation is verified by 3D measurements.
We extended the seminal experiment of Banaszek et al. of quantum tomography by photon counting without Radon transform postprocessing to the more general case of photon fluxes with more than one photon per detection time.
To measure relativistic laser hole boring velocities up to 0.18c, an ultra-broadband diagnostic capable of retrieving the full time resolved pulse phase is required. The design of such a device based on GRENOUILLE is presented.
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