Del Mar Photonics

Fiber-Bragg-grating writing in optical fibres

Fibre-Bragg-grating writing in single-mode optical fibres by the phase-mask method using 220-fs, 264-nm UV pulses of intensity 31-77 GW cm^ is reported for the first
time. The achieved degree of modulation of the photoinduced refractive index was 1.9 x 10^ in an H2-loaded SMF-28 telecommunication fibre and 1.1 x 10 in a H2-free Nufern GFl fibre. The dependence of the induced refractive index on the intensity for the same irradiation fluences in the case of the H2-loaded SMF-28 fibre shows that the refractive index is induced due to nonlinear absorption.


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Ti:Sapphire lasers
Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond Ti:Sapphire laser with integrated DPSS pump laser
Teahupoo Rider femtosecond amplified Ti:Sapphire laser

Cr:Forsterite lasers
Mavericks femtosecond Cr:Forsterite laser

Er-based lasers
Tamarack femtosecond fiber laser (Er-doped fiber)
Buccaneer femtosecond OA fiber laser (Er-doped fiber) and SHG
Cannon Ultra-broadband light source

Yb-based lasers
Tourmaline femtosecond Yt-doped fiber laser
Tourmaline Yb-SS400 Ytterbium-doped Femtosecond Solid-State Laser
Tourmaline Yb-ULRepRate-07 Yb-based high-energy fiber laser system kit

Cr:ZnSe lasers
Chata femtosecond Cr:ZnSe laser (2.5 micron) coming soon


Fabrication of fiber Bragg gratings with 267 nm femtosecond radiation

K.A. Zagorulko, P.G. Kryukov, Yu.V. Larionov, A.A. Rybaltovsky and E.M. Dianov
Fiber Optics Research Center at the A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences,
38 Vavilov Street, Moscow 119991, Russia

S.V. Chekalin, Yu.A. Matveets and V.O. Kompanets
Institute of Spectroscopy of the Russian Academy of Sciences, Troitsk, Moscow Region 142190, Russia

Abstract: Strong high-quality fiber Bragg gratings with photoinduced refractive-index modulation of more than 10-3 were written in a Corning SMF-28 fiber, a P2O5-doped-core fiber and a pure-silica-core fluorinedoped-cladding fiber by third-harmonic radiation (267 nm, 150 fs and 1.2-1.8×1011 W/cm2) of a femtosecond Ti:sapphire laser (Trestles) using a phase mask.
We compare the 267-nm photosensitivity responses with the results of irradiation by 193-nm ArF and 157-nm F2 excimer lasers. The dependence of the refractive-index change on the exposure dose and the annealing characteristics of the fabricated gratings are typical for Type-I UV-written fiber gratings.


Fibre Bragg Gratings Written in Pure Silica Photonic Crystal Fibres with Ultraviolet Femtosecond Laser Pulses

Libin Fu1, Graham D. Marshall2, Jeremy A. Bolger1, Paul E. Steinvurzel1, Eric C. Mägi1,
Michael J. Withford2, Benjamin J. Eggleton1,
1 CUDOS, School of Physics, University of Sydney, NSW 2006, Australia,
Phone: (612) 9036 5206, Fax: (612) 9351 7726
2 CUDOS, Department of Physics, Macquarie University, NSW 2109, Australia,
Phone: (612) 9850 7583, Fax: (612) 9850 8115

We report the fabrication of fibre Bragg gratings in pure silica photonic crystal fibres using UV
femtosecond laser radiation at 267 nm. Gratings have been fabricated with up to 10 dB transmission
loss and an average index change of Δn> 4×10-4.
Photonic crystal fibres (PCFs), optical fibres with a periodic array of air holes in the cladding,
comprise an exciting new class of waveguide with unique modal, dispersive and nonlinear properties.
Guidance in these fibres is mediated by the index contrast between the silica core and low effective
index holey cladding. They have been used as a platform for demonstrating new optical propagation
phenomena and for creating tunable fibre devices. The ability to write fibre Bragg gratings (FBGs) in
PCFs immediately suggests a broad range of new research to be conducted in these fibres. FBGs can
be used as a diagnostic tool to experimentally probe the modal properties of a fibre or to locally
modify the waveguide dispersion. They may also be used in the creation of novel fibre devices, where
the PCF geometry may provide enhanced functionality over conventional step index fibres.


TPA-induced long-period gratings in a photonic crystal fiber: inscription and temperature sensing properties

Fotiadi, Andrei A., Brambilla, Gilberto, Ernst, Thomas, Slattery, Stephen A. and Nikogosyan, David N. (2007) TPA-induced long-period gratings in a photonic crystal fiber: inscription and temperature sensing properties. Journal of the Optical Society of America B, 24, (7), 1475-1481.


We report on the photochemical recording of long-period fiber gratings (LPFGs) in a photonic crystal fiber made of pure fused silica. Such inscription is based on two-photon absorption (TPA) of high-intensity (~300GW/cm) 264 nm 220 fs pulses and brings about LPFGs of high strength and narrow peak width. The characteristic fluence value for the inscription is 1 order of magnitude less than that for a standard telecom fiber irradiated under similar conditions. The temperature sensitivity of TPA-induced LPFGs is ~300 pm/ °C and overcomes that of LPFGs inscribed by other nonphotochemical methods by 2 orders of magnitude.


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Del Mar Photonics featured customer: Dr Jeremy Bolger website

Bio: Jeremy Bolger received the BSc. Hons. (1st) degree from the University of Western Australia in 1982. He worked in applied mining research for Group Special Equipment, CRA, Melbourne for two years before moving to the UK to take up a British Council Commonwealth Scholarships and Fellowships Plan PhD scholarship at Heriot-Watt University, Edinburgh. He received his PhD in 1992 for a comprehensive investigation of ultrafast visible-wavelength nonlinearities in wide-gap II-VI semiconductors and in crystalline polymers.
Subsequent to his PhD studies, Dr. Bolger worked at the Iowa Advanced Technology Laboratories, University of Iowa, USA on ultrafast coherent dephasing nonlinearities in GaAs multiple-quantum wells (MQWs) at cryogenic temperatures. He devised and demonstrated a pioneering experiment in time- and polarization-resolved coherent four-wave mixing on 100 fs timescales, which demonstrated the influence of biexciton states in the optical properties of MQWs at much higher temperatures than previously thought. After working in industrial laboratories in defence and mining in Australia for four years Dr. Bolger moved into the fibre-optic component development industry in 2000, working for Nortel Networks (Photonic) and then JDS Uniphase, where he designed and prototyped components used in ultra-high speed long-haul transmission networks, including micro-optic circulators and dispersion-compensating gratings. He was responsible for the design and demonstration of the world’s smallest optical circulator, with length only 27 mm, which was subsequently commercialised to a mass-production stage.
He is currently the Laboratory Manager at the new Photonics and Optical Physics Laboratory at the University of Sydney (POPLUS), a new facility funded by CUDOS. Dr. Bolger is a member of the Optical Society of America.

Jeremy purchased Del Mar Photonics Pismo pulse picker with custom specifications.

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