Supercontinuum

About: Supercontinuum is a research topic. Over the lifetime, 7071 publications have been published within this topic receiving 127671 citations.

Supercontinuum generation in a highly biréfringent microstructured fiber

Abstract: We present experimental results on supercontinuum generation in a highly birefringent microstructured fiber We show that such a fiber offers clear advantages for continuum generation over weakly birefringent fibers In particular, the polarization is preserved along the fiber for all the spectral components Furthermore, the two eigenpolarizations exhibit different dispersion characteristics, which provide a convenient way of tuning the properties of the generated continuum We investigate the impact of the pump wavelength and pulse duration on the continuum and use the results to generate an ultrabroadband continuum extending from 400 to 1750 nm

Experimental studies of the coherence of microstructure-fiber supercontinuum.

Abstract: The phase coherence of supercontinuum generation in microstructure fiber is quantified by performing a Young’s type interference experiment between independently generated supercontinua from two separate fiber segments. Analysis of the resulting interferogram yields the wavelength dependence of the magnitude of the mutual degree of coherence, and a comparison of experimental results with numerical simulations suggests that the primary source of coherence degradation is the technical noise-induced fluctuations in the injected peak power.

High bandwidth absorption spectroscopy with a dispersed supercontinuum source

Abstract: An optical gas sensor is presented, making use of a dispersed supercontinuum source, capable of acquiring broad bandwidth spectra at ultrahigh wavelength sweep and repetition rates. Wavelength sweeps from 1100 nm to 1700 nm can be performed in 800 ns at a spectral resolution of 40 pm. This is comparable to line-widths of molecular spectra at atmospheric pressure. Quantitative measurements are presented of CH4 employing 80 nm wide sweeps over the P- Q- and R-branches of the 2ν3 transition near 1665 nm, at rates exceeding 100 kHz. The effective acquisition rate is determined by the amount of averaging required, and the effect of this averaging on observed precision is investigated.

Photonic crystal fibers : properties and applications

Abstract: Preface Acknowledgements Introduction 1 Basics of photonic crystal fibers 11 From conventional optical fibers to PCFs12 Guiding mechanism 121 Modified total internal reflection 122 Photonic bandgap guidance 13 Properties and applications 131 Solid-core fibers 132 Hollow-core fibers 14 Loss mechanisms 141 Intrinsic loss 142 Leakage loss 143 Bending loss 15 Fabrication process 151 Stack-and-draw technique 152 Extrusion fabrication process 153 Microstructured polymer optical fibers 154 OmniGuide fibers 16 Photonic crystal fibers in the market Bibliography 2 Guiding properties 21 Square-lattice PCFs 211 Guidance 212 Cut-off 22 Cut-off of large mode area triangular PCFs 23 Hollow-core modified honeycomb PCFs 231 Guidance and leakage 232 Birefringence Bibliography 3 Dispersion properties 31 PCFs for dispersion compensation 32 Dispersion of square-lattice PCFs 33 Dispersion-flattened triangular PCFs 331 PCFs with modified air-hole rings 332 Triangular-core PCFs Bibliography 4 Nonlinear properties 41 Supercontinuum generation 411 Physics of supercontinuum generation 412 Highly nonlinear PCFs 413 Dispersion properties and pump wavelength 414 Influence of the pump pulse regime 415 Applications 42 Optical parametric amplification 421 Triangular PCFs for OPA Dispersion and nonlinear properties 422 Phase-matching condition in triangular PCFs Optical parametric gain in triangular PCFs 43 Nonlinear coefficient in hollow-core PCFs Bibliography 5 Raman properties 51 Raman effective area and Raman gain coefficient 52 Raman properties of triangular PCFs 521 Silica triangular PCFs 522 Tellurite triangular PCFs 523 Enlarging air-hole triangular PCFs 53 Raman properties of honeycomb PCFs 54 PCF Raman amplifiers 541 Model for PCF Raman amplifiers 542 Triangular PCF Raman amplifiers 55 Impact of background losses on PCF Raman amplifiers 56 Multipump PCF Raman amplifiers Bibliography 6 Erbium-doped fiber amplifiers 61 Model for doped-fiber amplifiers 62 EDFAs based on honeycomb and cobweb PCFs 63 EDFAs based on triangular PCFs Bibliography A Finite Element Method A1 Formulation A2 PCF parameter evaluation Bibliography

4.35 kW peak power femtosecond pulse mode-locked VECSEL for supercontinuum generation

Abstract: We report a passively mode-locked vertical external cavity surface emitting laser (VECSEL) producing 400 fs pulses with 4.35 kW peak power. The average output power was 3.3 W and the VECSEL had a repetition rate of 1.67 GHz at a center wavelength of 1013 nm. A near-antiresonant, substrate-removed, 10 quantum well (QW) gain structure designed to enable femtosecond pulse operation is used. A SESAM which uses fast carrier recombination at the semiconductor surface and the optical Stark effect enables passive mode-locking. When 1 W of the VECSEL output is launched into a 2 m long photonic crystal fiber (PCF) with a 2.2 µm core, a supercontinuum spanning 175 nm, with average power 0.5 W is produced.