We propose a fiber stretcher for stretching the high-energy ultrashort pulses which require high dispersion and large mode area to secure high stretching ratio and for ensuring distortionless pulses. In this line, we suggest a novel design of photonic quasi-crystal fiber (PQF) to achieve the desired high normal group velocity dispersion (GVD) of 1000 ps2/km at 1.06 μm and inner core effective mode area as 35 μm2. These unique properties have been exploited to achieve a high stretching ratio (&gt;105) as well as less nonlinearity, which, in turn, results in a distortionless fiber stretcher for an Yb-doped high-energy ultrafast fiber laser system based on chirped pulse amplification. © 2006 IEEE.

Sivabalan S

Department of Instrumentation

School of Electrical Engineering

Vellore Campus

Raina J.P.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

High Normal Dispersion and Large Mode Area Photonic Quasi-Crystal Fiber Stretcher

IEEE Photonics Technology Letters

We propose a sixfold photonic quasi-crystal fiber with a trapezoidal analyte channel based on surface plasmon resonance for the detection of high-refractive-index (RI) liquid analytes and numerically analyze its sensing performance for different liquid analyte refractive indices and heights using the finite-element method. In contrast to the common D-shaped structure photonic crystal fiber, we design a trapezoidal analyte channel to investigate the role of the sample liquid height within the channel and discussed the feasibility of the fabrication process. We find that with various liquid analyte heights ratios of 20%, 25%, 30%, and 50% of the maximum channel height, the proposed biosensor exhibits linear sensing performance with a maximum RI sensitivity of 4400, 6100, 8000, and 17000 nm/RIU, respectively, for analytes RI range of 1.44-1.57, 1.41-1.51, 1.40-1.49, and 1.40-1.44. This sensor is suitable to detect various high RI chemicals, biochemicals, and organic chemical samples. Owing to its simple structure of the proposed biosensor with promising linear sensing performance, we envisage that this biosensor could turn out to be a versatile and competitive instrument for the detection of high-RI liquid analytes. © 1995-2012 IEEE.

Fulltext

IEEE Journal of Selected Topics in Quantum Electronics

Design and Analysis of Surface-Plasmon-Resonance-Based Photonic Quasi-Crystal Fiber Biosensor for High-Refractive-Index Liquid Analytes

A silica quasi-periodic clad leakage channel fiber (LCF) is proposed to enhance the mode filtering characteristics with large effective mode area (Aeff). In this work, we explore the fiber characteristics, namely, bending loss (BL),&nbsp;Aeff&nbsp;and differential loss for different micro-structured cladding LCF designs. Of the various LCFs, an octagonal core&ndash;octagonal quasi-periodic clad LCF provides a large loss ratio (&gt;103) between fundamental mode (LP01&nbsp;mode) and most competitive higher order mode (LP11&nbsp;mode). Further, it exhibits a high BL of 66.48&nbsp;dB/m for LP11&nbsp;mode by resonance mode filtering along with a bend induced modal discrimination at 1.05&nbsp;&mu;m wavelength. The detailed numerical results reveal that the differential loss ratio goes high when the effective index of the second ring of eight sectional elements in a quasi-periodic cladding is scaled up and the&nbsp;Aeff&nbsp;increases when it is scaled down. Thus, the proposed octagonal core&ndash;octagonal quasi-periodic clad LCF exhibits a large mode area of 1161&nbsp;&mu;m2, a low BL of 0.04&nbsp;dB/m for the LP01&nbsp;mode and a high differential loss ratio of 1624 between LP11&nbsp;and LP01&nbsp;modes at a critical bending radius of 15&nbsp;cm with an air-filling ratio of 0.4. These interesting properties of the LCF could pave way for developing a compact high power&nbsp;<a href="https://www.sciencedirect.com/topics/physics-and-astronomy/fiber-lasers" title="Learn more about Fiber Lasers from ScienceDirect's AI-generated Topic Pages">fiber laser</a>&nbsp;system.

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Optics Communications

Influence of quasi-periodic cladding on single mode behavior in a leakage channel fiber: Towards the enhancement of modal discrimination and low bending loss of the LP 01 mode

We design various tapered photonic crystal fibers (PCFs) , namely, hexagonal tapered PCF (H-TPCF), octagonal tapered PCF (O-TPCF) and decagonal tapered PCF (D-TPCF) for generating self-similar ultrashort pulses (USPs) and stretched pulses . Here, we report on pulse compression as well as pulse stretching using the above mentioned PCFs wherein both dispersion and nonlinear profiles vary exponentially. Of these PCFs, we use dispersion decreasing PCFs for pulse compression process and dispersion increasing PCFs for pulse stretching process. From the detailed analysis, we find that H-TPCFs could generate high quality USPs with more compression percentage whereas D-TPCFs could produce high quality stretched pulses with more stretching percentage.

Springer Proceedings in Physics Recent Trends in Materials Science and Applications

A Comparative Study on Designing Efficient Pulse Compressors and Pulse Stretchers Using Tapered Photonic Crystal Fibers

Communications in Computer and Information Science Modeling, Design and Simulation of Systems

Designing a Biosensor Using a Photonic Quasi-Crystal Fiber with Fan-Shaped Analyte Channel

Using finite-element method, we propose a photonic quasi-crystal fiber-based refractive index biosensor (PQF-RIBS), which works based on the surface plasmon polariton. We determine the loss spectra for two different variations of the refractive index of analyte, na. From the detailed numerical analysis, we find that the PQF-RIBS exhibits a maximum refractive index sensitivity of 6000 nm/RIU and a resolution of 1.6 × 10-6 RIU when na is increased from 1.45 to 1.46. Besides, this sensor does exhibit the negative refractive index sensitivity of -4000 nm/RIU and a resolution of 2.5 × 10-6 RIU for a sensing range from 1.52 to 1.53. Furthermore, we carry out selective filling of liquid in the selective holes of the proposed biosensor for a sensing wavelength range from 900 to 1200 nm. Finally, we also study the influence of the structural parameters, namely, diameter of the core and diameter of the air holes in the cladding over the loss spectra of a fundamental mode for a particular na of 1.47. © 2016 IEEE.

IEEE Sensors Journal

Designing a Biosensor Using a Photonic Quasi-Crystal Fiber

Oxford Art Online

Corning Glass Works

Optics Express

Distortionless large-ratio stretcher for ultra-short pulses using photonic crystal fiber

Air Guiding With Photonic Quasi-Crystal Fiber

A stretcher fiber for use in fs chirped pulse Yb amplifiers

Dispersion properties of dual-core photonic-quasicrystal fiber

Journal	Data powered by TypesetIEEE Photonics Technology Letters
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers (IEEE)
ISSN	1041-1135
Open Access	No