Deep-ultraviolet to mid-infrared supercontinuum generated in solid-core ZBLAN photonic crystal fibre

Jiang, Xin; Joly, Nicolas Y.; Finger, Martin A.; Babic, Fehim; Wong, G. K. L.; Travers, John C.; Russell, P. St. J.

doi:10.1038/nphoton.2014.320

Cited by 253 publications

(114 citation statements)

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“…Recent alternatives such as fluoride fibers [4] partially resolve this problem, extending the usable wavelength range into the deep ultraviolet (DUV). Kagomé-style hollow-core photonic crystal fiber (kagomé-PCF) is excellent alternative, offering a very low light-glass overlap [5].…”

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Generation of a vacuum ultraviolet to visible Raman frequency comb in H_2-filled kagomé photonic crystal fiber

et al. 2016

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We report the generation of a purely vibrational Raman comb, extending from the vacuum ultraviolet (184 nm) to the visible (478 nm), in hydrogen-filled kagomé-style photonic crystal fiber pumped at 266 nm. Stimulated Raman scattering and molecular modulation processes are enhanced by higher Raman gain in the ultraviolet. Owing to the pressure-tunable normal dispersion landscape of the "fiber + gas" system in the ultraviolet, higher-order anti-Stokes bands are generated preferentially in higher-order fiber modes. The results pave the way towards tunable fiber-based sources of deep-and vacuum ultraviolet light for applications in, e.g., spectroscopy and biomedicine.Fiber delivery and frequency conversion in the ultraviolet are topics of much current interest [1,2].Step-index fibers with pure silica cores have proven unsuitable because their performance dramatically falls over time due to colorcenter-related optical damage, unless they are hydrogen loaded [3]. Recent alternatives such as fluoride fibers [4] partially resolve this problem, extending the usable wavelength range into the deep ultraviolet (DUV). Kagomé-style hollow-core photonic crystal fiber (kagomé-PCF) is excellent alternative, offering a very low light-glass overlap [5]. It has been used for stable long-term transmission of continuous-wave 280 nm DUV light [6]. Kagomé-PCFs also offer very broad spectral transmission windows, and when gas-filled provide an ideal system for nonlinear generation of light at many different wavelengths. For example, when pumped at near infrared wavelengths, broadband DUV and vacuum ultraviolet (VUV) light has been generated in gasfilled kagomé-PCF [7,8].In this Letter, we discuss the first frequency-conversion scheme involving a H2-filled kagomé-PCF pumped at 266 nm. Taking advantage of the high Raman gain of H2 in the ultraviolet (about 3 times larger than at 532 nm [9]), we generate a purely vibrational Raman comb extending from the VUV (184 nm) to the visible (478 nm) via stimulated Raman scattering (SRS) and molecular modulation [10][11][12][13]. The short-wavelength bands extend further into the VUV than in previous experiments using H2-filled kagomé-PCF with narrow-band pump lasers [14,15]. Moreover, the narrow Raman gain bandwidth, together with a narrow-band pump, results in Raman sidebands with high spectral power density-a distinct advantage over broadband sources, when it is necessary to use filters (not always available in the DUV and VUV) to select spectral bands. The system demonstrated here is very compact compared to free-space arrangements [16] and its potential tunability using different Raman-active gases makes it ideal for applications such as high-resolution spectroscopy, metrology and biology.In SRS a relatively strong pump pulse scatters off the molecules in the medium giving rise to a lower energy Stokes signal. The beat note of the pump and Stokes signals excites a Raman-active mode of the molecule (in our system, the fundamental vibrational mode of H2 with ΩR/2π ~ 125 THz). This process is acco...

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Generation of a vacuum ultraviolet to visible Raman frequency comb in H_2-filled kagomé photonic crystal fiber

et al. 2016

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“…4). A remarkable feature of this source is that, unlike silica-glass, the ZBLAN glass shows no sign of degradation in the UV, even when operating for many hours at high brightness [13].…”

Section: Emergence Of Holey (With An 'E') Fibresmentioning

confidence: 99%

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Russell

2015

Europhysics News

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“…Further improvements over other materials include the possibility of direct grating couplers which can greatly improve performance over high confinement fluoride glasses. Fluoride glasses (including ZBLAN), have demonstrated very high non-linear response (n 2 = 5.4e-16 m 2 /W ) producing 200 -2,500 nm with nJ pulses of 1042-nm light 41 . Unfortunately, these structures with high confinement typically have to balance the advantages fo confinement with high coupling and propagation losses.…”

Section: Novel Materials For Non-linear Generationmentioning

confidence: 99%

Tantalum pentoxide waveguides and microresonators for VECSEL based frequency combs

Sverre

Woods

Shaw

et al. 2018

Vertical External Cavity Surface Emitting Lasers (VECSELs) VIII

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Tantalum pentoxide (Ta 2 O 5 ) is a promising material for mass-producible, multi-functional, integrated photonics circuits on silicon, exhibiting robust electrical, mechanical and thermal properties, as well as good CMOS compatibility. In addition, Ta 2 O 5 has been reported to demonstrate a non-linear response comparable to that of chalcogenide glass, in the region of 3-6 times larger than that of materials such as silica (SiO 2 ) or silicon nitride (Si 3 N 4 ). In contrast to Si-based dielectrics, it will accept trivalent ytterbium and erbium dopant ions, opening the possibility of on-chip amplification. The high refractive index of Ta 2 O 5 is consistent with small guided mode cross-section area, and allows the construction of micro-ring resonators. Propagation losses as low as 0.2 dB/cm have been reported. In this paper we describe the design of a planar Ta 2 O 5 waveguides optimised for the generation of coherent continuum with near infrared pulse trains at kW peak powers. The Pulse Repetition Frequency (PRF) of the VECSEL can be tuned to a sub-harmonic of the planar micro-ring and the optical pump power applied to the VECSEL can be adjusted so that mode-matching of the VECSEL pulse train with the micro-ring resonator can be achieved. We shall describe the fabrication of Ta 2 O 5 guiding structures, and the characterisation of their nonlinear and other optical properties. Characterisation with conventional lasers will be used to assess the degree of coherent spectral broadening likely to be achievable using these devices when driven by mode-locked VECSELs operating near the current state-of-art for pulse energy and duration.

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Deep-ultraviolet to mid-infrared supercontinuum generated in solid-core ZBLAN photonic crystal fibre

Cited by 253 publications

References 35 publications

Generation of a vacuum ultraviolet to visible Raman frequency comb in H_2-filled kagomé photonic crystal fiber

Generation of a vacuum ultraviolet to visible Raman frequency comb in H_2-filled kagomé photonic crystal fiber

Guiding light

Tantalum pentoxide waveguides and microresonators for VECSEL based frequency combs

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