Category: Broadband Sources

1. OCT Companies in the News

   (5 articles) NKT Photonics

   (5 articles) Exalos

   (3 articles) Multiwave Photonics

   (2 articles) NP Photonics

   (1 articles) Praevium Research

   (1 articles) Femtolasers

   (1 articles) Carl Zeiss Meditec

   (1 articles) Superlum

   (1 articles) Santec

   (1 articles) NTT Electronics

2. Organizations in the News

   (10 articles) University of Sheffield

   (3 articles) Cardiff University

   (2 articles) City University of New York

   (2 articles) Medical University of Vienna

   (2 articles) University of Kent

   (2 articles) University of Waterloo

   (2 articles) Tampere University of Technology

   (1 articles) Ludwig Maximilians Universität München

   (1 articles) Indiana University

   (1 articles) Upper Austrian Research GmbH

3. People in the News

   (7 articles) Richard Hogg

   (5 articles) Ziyang Zhang

   (4 articles) Alfred Leitenstorfer

   (3 articles) Adrian G. Podoleanu

   (3 articles) Wolfgang Drexler

   (2 articles) Boris Povazay

   (2 articles) Boris Hermann

   (2 articles) Robert R. Alfano

   (2 articles) Adrian Bradu

   (2 articles) Kostadinka K. Bizheva

1. Ce^3+:YAG double-clad crystal-fiber-based optical coherence tomography on fish cornea

   Explore Article opticsinfobase.org (Mar 4 2010) Broadband Sources

   A Ce3+:YAG double-clad crystal fiber (DCF) visible emission was used as the light source for optical coherence tomography (OCT). The visible emission was produced from a 10 μm core DCF pumped by a diode laser. The broadband emission and short central wavelength of this light source enabled the realization of 1.5 μm axial resolution in air. The relatively clean spectrum reduced the side lobe of its point-spread function, and therefore facilitated the generation of a high-quality image with less crosstalk between adjacent image pixels. As a demonstration, an Aplocheilus lineatus goldfish was experimented on to map out the stroma of ...
   

   Comment on Article Mentions:   National Taiwan University

2. High power broadband superluminescent diode

   Explore Article PatFT » Page 1 of 1 (Mar 2 2010) Patents , Broadband Sources

   A superluminescent diode according the present invention employs a uniform AlGaInAs quantum well on an InP substrate, emitting in a range of 1100 to 1800 nm. The favorable conduction band: valence band offset ratio of this material system enables superluminescent diodes which simultaneously provide high power and large optical bandwidth. A recent reduction to practice of the present invention simultaneously demonstrates output power exceeding 100 mW and bandwidth exceeding 100 nm. A preferred embodiment of this invention uses multiple uniform AlGaInAs quantum wells with two confined quantum states and energetic separation in a range of 100-130 nm. An alternate preferred ...
   

   Comment on Article Mentions:   Praevium Research   Vijaysekhar Jayaraman

3. Direct femtosecond laser written waveguides in bulk Ti:Sapphire

   Explore Article SPIE Digital Library (Feb 25 2010) Broadband Sources

   We report on direct inscription of type-II waveguides in bulk titanium-doped sapphire with an ultrafast chirpedpulse oscillator. Ti3+:Sapphire is of particular interest due to its large emission bandwidth which enables a broadband tunability and generation of ultra-short pulses. However, its lasing threshold is high and powerful high brightness pump sources are required. The fabrication of a waveguide in Ti3+:Sapphire could thus enable the fabrication of low-threshold tunable lasers and broadband fluorescence sources. The latter are of interest for optical coherence tomography where the obtainable resolution scales with the bandwidth of the light source. The fabricated waveguides are formed in-between two ...
   

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4. Highly nonlinear photonic crystal fiber with high refractive index core for dental OCT applications

   Explore Article SPIE Digital Library (Feb 23 2010) Dentistry , Broadband Sources

   Optical coherence tomography is a technology which supplies the tomographic image using the optical interference. It uses the 1.31 µm wavelength for dental applications. Resolution problems of such a technology can be improved by using supercontinuum light sources as low coherent broadband light is achievable from optical supercontinuum. Photonic crystal fibers have the ability to generate the supercontinuum light even with moderate input power levels. Only thing to consider is to ensure zero or nearly zero dispersion of such fibers at the target 1.31µm wavelength. This paper presents design of a high nonlinear photonic crystal fiber with near-zero dispersion around ...
   

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5. 20 mW, 70 nm bandwidth ASE fibre optic source at 1060 nm wavelength region for optical coherence tomography

   Explore Article SPIE Digital Library (Feb 17 2010) Broadband Sources

   Optical coherence tomography (OCT) imaging at 1060 nm region proved to be a successful alternative in ophthalmology not only for resolving intraretinal layers, but also for enabling sufficient penetration to monitor the sub-retinal vasculature in the choroids when compared to most commonly used OCT imaging systems at 800 nm region. To encourage further clinical research at this particular wavelength, we have developed a compact fiber optic source based on amplified spontaneous emission (ASE) centered at ~1060 nm with ~70 nm spectral bandwidth at full-width half maximum (FWHM) and output power >20 mW. Our approach is based on a combination of ...
   

   Comment on Article Mentions:   Adrian G. Podoleanu   Multiwave Photonics   University of Kent

6. In vivo Ultrahigh-Resolution Ophthalmic Optical Coherence Tomography Using Gaussian-Shaped Supercontinuum

   Explore Article jjap.ipap.jp (Jan 19 2010) Ophthalmology , Broadband Sources

   We have demonstrated the in vivo ultrahigh-resolution optical coherence tomography (OCT) imaging of the human eye using a Gaussian-shaped supercontinuum source. Using an ultrashort-pulse Ti:sapphire laser and a polarization-maintaining single-mode fiber, a linearly polarized, high-power, low-noise, Gaussian-shaped supercontinuum is generated in the wavelength region from 700 to 950 nm. For ophthalmic imaging, a wideband Gaussian-shaped supercontinuum with a bandwidth of 140 nm is generated at a center wavelength of 830 nm. The observed axial resolutions are 2.9 µm in air and 2.1 µm in tissue. The generated supercontinuum is combined with a modified ophthalmic OCT system, and sidelobe-free ultrahigh-resolution OCT ...
   

   Comment on Article Mentions:   Nidek   Osaka University Medical School

7. The pulse quickens for ultrafast optics - German researchers are making waves in ultrafast physics

   Explore Article optics.org (Jan 18 2010) Broadband Sources

   Single-cycle pulses in the telecoms wavelength regime have been demonstrated for the first time, with scientists touting possible applications in ultrafast optical imaging and frequency metrology. A group at Konstanz University, Germany, has produced single cycles of light with a pulse duration of 4.3 fs, close to the shortest possible value for a data bit of information transmitted in the near-infrared (Nature Photonics DOI: 10.1038/NPHOTON.2009.258). "We have generated what we believe to be the shortest and most high frequency truly single-cycle pulse to date," Alfred Leitenstorfer, chair of modern optics and quantum electronics at Konstanz, told optics.org. "Our initial motivation ...
   

   Comment on Article Mentions:   Alfred Leitenstorfer

8. Highly nonlinear photonic crystal fibers for optical coherence tomography applications

   Explore Article SPIE Digital Library (Nov 25 2009) Broadband Sources

   We propose a simple highly nonlinear photonic crystal fiber in optical coherence tomography window. Based on the finite difference method, different properties of highly nonlinear photonic crystal fibers are calculated. It is demonstrated that the nonlinear coefficients more than 64 and 55 [Wkm]-1 at 1.06 µm and 1.31 µm, respectively, with flattened chromatic dispersion of 0 ± 3.7 ps/(nm.km) and low confinement losses less than 10-9 dB/m, simultaneously. It is also shown that small chromatic dispersion value and nearly zero dispersion slop provide the possibility of efficient supercontinuum generation in the optical coherence tomography window using a few ps pulses.
   

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9. All-fiber smooth supercontinuum generation in highly nonlinear dispersion-shifted fiber

   Explore Article SPIE Digital Library (Nov 24 2009) Broadband Sources

   Supercontinuum(SC) source has found numerous applications, such as DWDM, frequency metrology, optical coherence tomography, and optical measurement. We demonstrate an all-fiber supercontimuun source generated in highly nonlinear fiber (HNLF). The HNLF is pumped by our mode-locked fiber laser with pulse width and peak power, 21.1ps and kW, respectively. An ultra-broadband supercontinuum extends from 1000 nm to 1750 nm is obtained, and the spectrum is flat with the amplitude variation less than 4dB except around the fiber zero dispersion wavelength. The spectrum of our supercontinuum source can extend beyond 1750 nm, but due to the limitation of the measured range of ...
   

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10. Ultra-broadband light source for optical coherence tomography by fiber matching

    Explore Article SPIE Digital Library (Nov 24 2009) Broadband Sources

    In this paper, an ultra-broadband all fiber light source for optical coherence tomography was obtained. This light source was obtained by supercontinuum (SC) generated in matched fibers with different characteristics. It was showed that the spectrum quality was affected by dispersion and nonlinear characteristics of the fiber pumped firstly. SC spectrum flatness on the short wavelength side of pumping wavelength was affected by characteristic of the fiber pumped secondly. Dispersion shifted fiber (DSF) was connected after highly nonlinear fiber (HNLF) to optimize spectral shape. Widely broadened SC spectrum was generated in the combination of 120m HNLF+4.5km DSF+2km single mode fiber ...
    

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11. Effect of input spectrum on the spectral switch characteristics in a white-light Michelson interferometer

    Explore Article opticsinfobase.org (Nov 16 2009) Broadband Sources

    We report here a detailed experimental study to demonstrate the effect of source spectral characteristics such as spectral bandwidth (Δλ), peak wavelength (λ0), and shape of the spectrum on the spectral shifts and spectral switches measured due to temporal correlation in a white-light Michelson interferometer operated in the spectral domain. Behavior of the spectral switch characteristics such as the switch position, switch amplitude, and switch symmetry are discussed in detail as a function of optical path difference between the interfering beams. The experimental results are compared with numerical calculations carried out using interference law in the spectral domain with modified ...
    

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12. New Shine on Old Gems

    Explore Article Photonics.com (Jul 31 2009) Broadband Sources

    Trivalent chromium-doped LIGO/LISO offers the widest lasing bandwidth in the telecommunications windows. Newly developed Cr3+ laser crystals called LIGO and LISO, developed at the Institute for Ultrafast Spectroscopy and Lasers (IUSL) at City College of the City University of New York, extend the family of ruby and alexandrite lasers operating in the near-infrared from 1150 to 1620 nm for possible 6-fs-pulse-generation and telecommunications applications. Combined with Ti:sapphire crystals, pulses as short as approximately 2 fs could be produced. In addition, the broad spectral operation of these materials is suitable for generating 6-fs-pulse optical coherence tomography, condensed matter physics, and biological ...
    

    Comment on Article Mentions:   City University of New York   Robert R. Alfano

13. Coherence function control of Quantum Dot Superluminescent Light Emitting Diodes by frequency selective optical feedback

    Explore Article opticsinfobase.org (Jul 20 2009) Broadband Sources

    Low coherent light interferometry requires broad bandwidth light sources to achieve high axial resolution. Here, Superluminescent Light Emitting Diodes (SLDs) utilizing Quantum Dot (QD) gain materials are promising devices as they unify large spectral bandwidths with sufficient power at desired emission wavelengths. However, frequently a dip occurs in the optical spectrum that translates into high side lobes in the coherence function thereby reducing axial resolution and image quality. We apply the experimental technique of frequency selective feedback to shape the optical spectrum of the QD-SLD, hence optimizing the coherence properties. For well-selected feedback parameters, a strong reduction of the parasitic ...
    

    Comment on Article Mentions:   University of Sheffield

14. The Supercontinuum Laser Source: Fundamentals with Updated References (Book)

    Explore Article Springer US (Jun 27 2009) Broadband Sources , Textbooks

    Photonics and nonlinear optics are important areas of science, engineering and technology. One of the most important ultrafast nonlinear optical processes is the supercontinuum (SC) – the production of intense white light pulses covering: uv, visible, NIR, MIR, and IR. It is produced using ultrashort laser pulses (ps/fs) to produce the ultrabroad band of frequencies. This book covers the fundamental principles and surveys research of current thinkers and experts in the field with updated references of the key breakthroughs over the past decade and a half. The application of SC are time-resolved pump-SC probe absorption and excitation spectroscopy for chemistry, ...
    

    Comment on Article Mentions:   City University of New York   Robert R. Alfano

15. Tuning Superluminescent Diode Characteristics for Optical Coherence Tomography Systems by Utilizing a Multicontact Device Incorporating Wavelength-Modulated Quantum Dots

    Explore Article IEEE Xplore (Jun 4 2009) Broadband Sources

    This paper details the development of broadband sources at 1050 nm for optical coherence tomography applications. A method for obtaining a broad and smooth emission and gain spectrum for 1050 nm quantum dot (QD) layers is presented. The design, fabrication, and operating characteristics of multicontact superluminescent diodes are then set out, and the operating characteristics of this device, incorporating the broadband QD material, are described. It is shown that this device allows the tuning of the emission spectrum peak position, peak shape, emission bandwidth, and power, which are advantageous for imaging applications. A simplified device, utilizing a single current source, ...
    

    Comment on Article Mentions:   University of Sheffield   Richard Hogg

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