Search results for "laser modes"

showing 2 items of 2 documents

All-Fiber Laser With Intracavity Acousto-Optic Dynamic Mode Converter for Efficient Generation of Radially Polarized Cylindrical Vector Beams

2017

We report an all-fiber laser that emits a radially polarized cylindrical vector beam (CVB) at 1 μm based on an intracavity acousto-optic mode converter. We efficiently generate the CVB, taking advantage of the acousto-optic coupling from the HE11 mode to the TM01 mode in a two-mode fiber. The laser can be switched from emitting a Gaussian-like beam to a radially polarized CVB. Radially polarized CVBs with modal and polarization purities >98% and a maximum power of 65 mW were generated.

lcsh:Applied optics. PhotonicsMaximum power principlePhysics::Optics02 engineering and technologyLaser modes01 natural scienceslaw.invention010309 optics020210 optoelectronics & photonicsOpticslawradial polarization.Fiber laser0103 physical sciences0202 electrical engineering electronic engineering information engineeringlcsh:QC350-467Electrical and Electronic EngineeringFiber Laserscylindrical vector beams (CVBs)PhysicsCouplingLaser excitationbusiness.industryCylindrical vector beamFiber laserlcsh:TA1501-1820Polarization (waves)LaserUNESCO::FÍSICA::Óptica ::Fibras ópticasAtomic and Molecular Physics and OpticsAll fiber:FÍSICA::Óptica ::Fibras ópticas [UNESCO]CouplingsOptoelectronicsbusinessOptical fiber polarizationBeam (structure)lcsh:Optics. LightLaser beamsIEEE Photonics Journal
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Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning

2013

Selecting and tuning modes are useful in ultrasonic guided wave non-destructive testing (NDT) since certain modes at various center frequencies are sensitive to specific types of defects. Ideally one should be able to select both the mode and the center frequency of the launched waves. We demonstrated that an affordable laser diode array can selectively launch either the S0 or A0 ultrasonic wave mode at a chosen center frequency into a polymer plate. A fiber-coupled diode array (4 elements) illuminated a 2 mm thick acrylic plate. A predetermined time delay matching the selected mode and frequency was employed between the output of the elements. The generated ultrasound was detected by a 215…

nondestructive testingplates (structures)delayssemiconductor laser arraysacoustic receiversoptical fibre couplersacoustic waveguidesultrasonic wavespolymeeritlaser modeslaser tuning
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