Ultraflat, broadband, and highly coherent supercontinuum generation in all-solid microstructured optical fibers with all-normal dispersion

Huang, Chunlei; Liao, Meisong; Bi, Wanjun; Xia, Li; Hu, Lili; Zhang, Long; Wang, Long; Qin, Guanshi; Xue, T.; Chen, Danping; Gao, Weiqing

doi:10.1364/prj.6.000601

Cited by 51 publications

(21 citation statements)

References 46 publications

(54 reference statements)

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“…Optimization of the fibre laser source. The pulse train instabilities measured with SC d-scan were identified as originating from nonlinear dynamics within the anomalous dispersion PCF, whereas the generation of stable pulses in fibres is usually achieved in all-normal dispersion (ANDi) schemes 10,[17][18][19]40 . The overall dispersion curve of an ANDi PCF is negative but relatively close to zero over the whole bandwidth (Fig.…”

Section: Resultsmentioning

confidence: 99%

Detection and elimination of pulse train instabilities in broadband fibre lasers using dispersion scan

Alonso

Torres-Peiró²,

Romero³

et al. 2020

Sci Rep

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We use self-calibrating dispersion scan to experimentally detect and quantify the presence of pulse train instabilities in ultrashort laser pulse trains. We numerically test our approach against two different types of pulse instability, namely second-order phase fluctuations and random phase instability, where the introduction of an adequate metric enables univocally quantifying the amount of instability. The approach is experimentally demonstrated with a supercontinuum fibre laser, where we observe and identify pulse train instabilities due to nonlinear propagation effects under anomalous dispersion conditions in the photonic crystal fibre used for spectral broadening. By replacing the latter with an allnormal dispersion fibre, we effectively correct the pulse train instability and increase the bandwidth of the generated coherent spectrum. This is further confirmed by temporal compression and measurement of the output pulses down to 15 fs using dispersion scan.

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Section: Resultsmentioning

confidence: 99%

Detection and elimination of pulse train instabilities in broadband fibre lasers using dispersion scan

Alonso

Torres-Peiró²,

Romero³

et al. 2020

Sci Rep

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“…For multi-mode fiber, the effect of higherorder modes for SC spectrum broadening was relatively insignificant if the pulse was extremely short (<10 ps), 28 thus only fundamental mode dispersion can be considered here. Given that pumping in the normal dispersion region of fibers can obtain high coherence light sources using ultrafast lasers, [29][30][31] we chose to pump the As-Se-Te glass fiber at the normal dispersion regime to generate the high coherence SC light. Figure 5A shows a comparison of the loss spectra of unclad As 40 Se 40 Te 20 fibers drawn with purified and unpurified glass.…”

Section: Resultsmentioning

confidence: 99%

1.8–13 μm supercontinuum generation by pumping at normal dispersion regime of As–Se–Te glass fiber

Yang

et al. 2019

J Am Ceram Soc

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Mid‐infrared (MIR) band supercontinuum (SC) light source has highly important application prospects in aerospace, biomedicine, MIR sensing, and pollutant monitoring. As–Se–Te glass has high nonlinear refractive index, wide MIR transmission range and weak crystallization ability. As40Se40Te20 glass fiber is suitable for producing wide MIR–SC spectrum. In this study, purified As40Se40Te20 glass was prepared and unclad and step‐index fibers were drawn. An unclad As40Se40Te20 glass fiber with minimum loss of 1.7 dB/m at 8.8 μm was obtained. By pumping the unclad fiber in the normal dispersion region at 5 μm, we recorded the broadest SC generation spectrum, which covered 1.8–13 μm with a 30 dB spectral flatness, from a fiber with 15 cm length. Besides, As40Se40Te20/As40Se42Te18 step‐index fiber with minimum loss of 5.6 dB/m at 5 μm was drawn from isolation extruded preform. The step‐index fiber was pumped in the normal dispersion region at 5 μm, and the SC spectrum, covering 2.1–11.2 μm with a 40 dB spectral flatness, was recorded from a fiber with 15 cm length. The SC spectrum, which was achieved by pumping the As40Se40Te20 fiber, covered almost all the transparent range of material.

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“…The SC in the ultraviolet-blue region is highly useful for fluorescence microscopy because many fluorescent molecules are excited in the wavelength range from ~600 to ~350 nm [7,8]. Compared to conventional fiber, the chromatic dispersion and nonlinear properties of photonic crystal fiber (PCF) could be profoundly altered by modifying the PCF cross structure [9][10][11]. Therefore, the emergence of PCF brings a dramatic revolution to SC generation.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet-Extended Supercontinuum Generation in Zero-Dispersion Wavelength Decreasing Photonic Crystal Fibers

Liao

et al. 2020

IEEE Photonics J.

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Supercontinuum covering the ultraviolet-blue region is highly useful for fluorescence microscopy. Four zero-dispersion wavelength decreasing photonic crystal fibers with different fiber cross structures and taper profiles are fabricated to extend the short wavelength edge of supercontinuum. Both nanosecond and picosecond pump pulses at 1 μm are used to generate supercontinuum. With a 3 ns pump pulse, the short wavelength edge of supercontinuum is extended to below 400 nm in a fiber with high air-hole ratio (named T3). The underlying mechanism of supercontinuum generation is explored. The short and long wavelength edges of supercontinuum are highly related with the phase-matching condition which decided by the group velocity curve of fiber small core end. With a 10 ps pump pulse, the spectral intensity around ~800 nm increases in all four fibers. However, the intensity in shorter wavelength band decreased in fibers with a high air-hole ratio (named T3, T4). The experimental results imply that a zero-dispersion wavelength decreasing photonic crystal fiber suitable for nanosecond pulse pumping is not necessarily suitable for picosecond pulse pumping, especially for fibers with high air-hole ratio.

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Ultraflat, broadband, and highly coherent supercontinuum generation in all-solid microstructured optical fibers with all-normal dispersion

Cited by 51 publications

References 46 publications

Detection and elimination of pulse train instabilities in broadband fibre lasers using dispersion scan

Detection and elimination of pulse train instabilities in broadband fibre lasers using dispersion scan

1.8–13 μm supercontinuum generation by pumping at normal dispersion regime of As–Se–Te glass fiber

Ultraviolet-Extended Supercontinuum Generation in Zero-Dispersion Wavelength Decreasing Photonic Crystal Fibers

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