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Resonance-enhanced multi-octave supercontinuum generation in antiresonant hollow-core fibers 被引量:3
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作者 Rudrakant Sollapur Daniil Kartashov +10 位作者 Michael Zürch Andreas Hoffmann Teodora Grigorova Gregor Sauer Alexander Hartung anka schwuchow Joerg Bierlich Jens Kobelke Mario Chemnitz Markus A Schmidt Christian Spielmann 《Light(Science & Applications)》 SCIE EI CAS CSCD 2017年第1期286-292,共7页
Ultrafast supercontinuum generation in gas-filled waveguides is an enabling technology for many intriguing applications ranging from attosecond metrology towards biophotonics,with the amount of spectral broadening cru... Ultrafast supercontinuum generation in gas-filled waveguides is an enabling technology for many intriguing applications ranging from attosecond metrology towards biophotonics,with the amount of spectral broadening crucially depending on the pulse dispersion of the propagating mode.In this study,we show that structural resonances in a gas-filled antiresonant hollow core optical fiber provide an additional degree of freedom in dispersion engineering,which enables the generation of more than three octaves of broadband light that ranges from deep UV wavelengths to near infrared.Our observation relies on the introduction of a geometric-induced resonance in the spectral vicinity of the ultrafast pump laser,outperforming gas dispersion and yielding a unique dispersion profile independent of core size,which is highly relevant for scaling input powers.Using a krypton-filled fiber,we observe spectral broadening from 200 nm to 1.7μm at an output energy of B 23μJ within a single optical mode across the entire spectral bandwidth.Simulations show that the frequency generation results from an accelerated fission process of solitonlike waveforms in a non-adiabatic dispersion regime associated with the emission of multiple phase-matched Cherenkov radiations on both sides of the resonance.This effect,along with the dispersion tuning and scaling capabilities of the fiber geometry,enables coherent ultra-broadband and high-energy sources,which range from the UV to the mid‐infrared spectral range. 展开更多
关键词 antiresonant hollow core fiber dispersion design nonlinear optics soliton dynamics supercontinuum generation
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Multimodal nonlinear endomicroscopic imaging probe using a double-core double-clad fiber and focus-combining micro-optical concept 被引量:3
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作者 Ekaterina Pshenay-Severin Hyeonsoo Bae +9 位作者 Karl Reichwald Gregor Matz Jörg Bierlich Jens Kobelke Adrian Lorenz anka schwuchow Tobias Meyer-Zedler Michael Schmitt Bernhard Messerschmidt Juergen Popp 《Light(Science & Applications)》 SCIE EI CAS CSCD 2021年第11期2173-2183,共11页
Multimodal non-linear microscopy combining coherent anti-Stokes Raman scattering,second harmonic generation,and two-photon excited fluorescence has proved to be a versatile and powerful tool enabling the label-free in... Multimodal non-linear microscopy combining coherent anti-Stokes Raman scattering,second harmonic generation,and two-photon excited fluorescence has proved to be a versatile and powerful tool enabling the label-free investigation of tissue structure,molecular composition,and correlation with function and disease status.For a routine medical application,the implementation of this approach into an in vivo imaging endoscope is required.However,this is a difficult task due to the requirements of a multicolour ultrashort laser delivery from a compact and robust laser source through a fiber with low losses and temporal synchronization,the efficient signal collection in epi-direction,the need for small-diameter but highly corrected endomicroobjectives of high numerical aperture and compact scanners.Here,we introduce an ultra-compact fiber-scanning endoscope platform for multimodal non-linear endomicroscopy in combination with a compact four-wave mixing based fiber laser.The heart of this fiber-scanning endoscope is an in-house custom-designed,single mode,double clad,double core pure silica fiber in combination with a 2.4 mm diameter NIR-dual-waveband corrected endomicroscopic objective of 0.55 numerical aperture and 180µm field of view for non-linear imaging,allowing a background free,low-loss,high peak power laser delivery,and an efficient signal collection in backward direction.A linear diffractive optical grating overlays pump and Stokes laser foci across the full field of view,such that diffraction-limited performance is demonstrated for tissue imaging at one frame per second with sub-micron spatial resolution and at a high transmission of 65%from the laser to the specimen using a distal resonant fiber scanner. 展开更多
关键词 FIBER double SCANNER
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