Toward Self-Similar Propagation of Optical Pulses in a Dispersion Tailored, Nonlinear, and Segmented Bragg-Fiber at 2.8 $\mu$m
01 Aug 2017-IEEE Photonics Journal (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 9, Iss: 4, pp 1-12
TL;DR: In this paper, the authors demonstrate self-similar stable propagation of parabolic optical pulses through a highly nonlinear specialty Bragg fiber at 2.8€$ m by a numerical approach.
Abstract: We demonstrate self-similar stable propagation of parabolic optical pulses through a highly nonlinear specialty Bragg fiber at 2.8 $\mu$ m by a numerical approach. To obtain such propagation characteristics over a longer length of a Bragg fiber, we propose and verify a fiber design scheme that underpins passive introduction of a rapidly varying group-velocity dispersion around its zero dispersion wavelength and modulated nonlinear profile through suitable variation in its diameter. To implement the proposed scheme, we design a segmented and tapered chalcogenide Bragg fiber in which a Gaussian pulse is fed. Transformation of such a launched pulse to a self-similar parabolic pulse with full-width-at-half-maxima of 4.12 ps and energy of $\sim$ 39 pJ is obtained at the output. Furthermore, a linear chirp spanning across the entire pulse duration and 3 dB spectral broadening of about 38 nm at the output are reported. In principle, the proposed scheme could be implemented in any chosen set of materials.
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01 Mar 2019
TL;DR: In this paper, the authors reviewed some application-specific fiber designs for parabolic pulse generation to overcome nonlinear detriments, and all-fiber light sources for mid-IR and THz photonics.
Abstract: Specialty optical fiber for specific applications have become a new paradigm in guided wave photonics. In this invited presentation, we would review some of our application-specific specialty fiber designs for parabolic pulse generation to overcome nonlinear detriments, and all-fiber light sources for mid-IR and THz photonics.
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...Details of our work in this direction can be found in [3]....
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References
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TL;DR: It is numerically and experimentally demonstrated that pulses with a parabolic intensity profile can be formed by passive reshaping of more conventional laser pulses using nonlinear propagation in a length of normally dispersive nonlinear fibre.
Abstract: We numerically and experimentally demonstrate that pulses with a parabolic intensity profile can be formed by passive reshaping of more conventional laser pulses using nonlinear propagation in a length of normally dispersive nonlinear fibre. Moreover, we show that the parabolic shape can be stabilised by launching these pulses into a second length of fiber with suitably different nonlinear and dispersive characteristics relative to the initial reshaping fiber.
116 citations
"Toward Self-Similar Propagation of ..." refers background in this paper
...On the basis of few reports in [24], [25], self-similar PPs are realizable in passive fibers with N ≤ 10 over longer distances whereas the same is difficult in fibers with N 10 as in the cases of chalcogenide glass made fibers....
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TL;DR: Recent progress on self-similar oscillators both in passive and active fiber, and extensions of self-Similar evolution for surpassing the limits of rare-earth gain media are reviewed.
Abstract: Self-similar fiber oscillators are a relatively new class of mode-locked lasers. In these lasers, the self-similar evolution of a chirped parabolic pulse in normally-dispersive passive, active, or dispersion-decreasing fiber (DDF) is critical. In active (gain) fiber and DDF, the novel role of local nonlinear attraction makes the oscillators fundamentally different from any mode-locked lasers considered previously. In order to reconcile the spectral and temporal expansion of a pulse in the self-similar segment with the self-consistency required by a laser cavity's periodic boundary condition, several techniques have been applied. The result is a diverse range of fiber oscillators which demonstrate the exciting new design possibilities based on the self-similar model. Here, we review recent progress on self-similar oscillators both in passive and active fiber, and extensions of self-similar evolution for surpassing the limits of rare-earth gain media. We discuss some key remaining research questions and important future directions. Self-similar oscillators are capable of exceptional performance among ultrashort pulsed fiber lasers, and may be of key interest in the development of future ultrashort pulsed fiber lasers for medical imaging applications, as well as for low-noise fiber-based frequency combs. Their uniqueness among mode-locked lasers motivates study into their properties and behaviors and raises questions about how to understand mode-locked lasers more generally.
115 citations
"Toward Self-Similar Propagation of ..." refers background in this paper
...In this context, mid-IR laser sources delivering femtosecond pulses with energy in the order of nano-Joules [27], mid-IR supercontinuum sources spanning over wide ranges of wavelength with much higher peak power [44]–[46], etc....
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...Thus for our targeted applications in the mid-IR wavelength range such as high power delivery [2], [3], [26], and SC-generation at mid-IR [1] necessitate novel schemes for designing specialty fibers to address the specific difficulty of high power PP propagation over longer distances through nonlinear media [27]....
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TL;DR: It is shown that a hybrid configuration combining dispersion decrease and gain has several benefits on the parabolic generated pulses.
Abstract: We experimentally demonstrate the possibility to generate parabolic pulses via a single dispersion decreasing optical fiber with normal dispersion. We numerically and experimentally investigate the influence of the dispersion profile, and we show that a hybrid configuration combining dispersion decrease and gain has several benefits on the parabolic generated pulses.
112 citations
"Toward Self-Similar Propagation of ..." refers background in this paper
...Hence, the so formed PPs are merely intermediate transient state of propagation and eventually fail to retain its acquired self-similarity over longer propagation length [18], [22]....
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TL;DR: Experimental results on Microstructured Optical Fiber splicing with a simple method relying on conventional electric-arc splicers are presented in terms of fusion losses and tensile strength.
Abstract: We present experimental results on Microstructured Optical Fiber (MOF) splicing with a simple method relying on conventional electric-arc splicers. The results are presented in terms of fusion losses and tensile strength. An electric-arc splicing system is used to demonstrate its effectiveness in splicing MOFs together as well as splicing MOF with a single mode fiber.
111 citations
"Toward Self-Similar Propagation of ..." refers background in this paper
...08 dB loss for each identical Bragg fiber splicing) [49]....
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TL;DR: Numerical modeling of mid-infrared (MIR) supercontinuum generation (SCG) in dispersion-optimized chalcogenide (CHALC) step-index fibres (SIFs) with exceptionally high numerical aperture (NA) around one, pumped with mode-locked praseodymium-doped (Pr(3+)) chalCogenide fibre lasers.
Abstract: We present numerical modeling of mid-infrared (MIR) supercontinuum generation (SCG) in dispersion-optimized chalcogenide (CHALC) step-index fibres (SIFs) with exceptionally high numerical aperture (NA) around one, pumped with mode-locked praseodymium-doped (Pr3+) chalcogenide fibre lasers. The 4.5um laser is assumed to have a repetition rate of 4MHz with 50ps long pulses having a peak power of 4.7kW. A thorough fibre design optimisation was conducted using measured material dispersion (As-Se/Ge-As-Se) and measured fibre loss obtained in fabricated fibre of the same materials. The loss was below 2.5dB/m in the 3.3–9.4μm region. Fibres with 8 and 10μm core diameters generated an SC out to 12.5 and 10.7μm in less than 2m of fibre when pumped with 0.75 and 1kW, respectively. Larger core fibres with 20μm core diameters for potential higher power handling generated an SC out to 10.6μm for the highest NA considered but required pumping at 4.7kW as well as up to 3m of fibre to compensate for the lower nonlinearities. The amount of power converted into the 8–10μm band was 7.5 and 8.8mW for the 8 and 10μm fibres, respectively. For the 20μm core fibres up to 46mW was converted.
93 citations
"Toward Self-Similar Propagation of ..." refers background in this paper
...Moreover, other physical parameters of the two materials are in good agreement to have better thermo-mechanical compatibility [32]–[34]....
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