Chalcogenide photonic crystal fiber for ultraflat mid-infrared supercontinuum generation
TL;DR: In this article, the authors numerically simulate the generation of a 1-15 μm mid-infrared supercontinuum (SC) from a highly nonlinear Ge11.5As24Se64.5-based photonic crystal fiber (PCF).
Abstract: In this Letter, we numerically simulate the generation of a 1–15 μm
mid-infrared supercontinuum (SC) from a highly nonlinear
Ge11.5As24Se64.5-based photonic
crystal fiber (PCF). This ultra-broadband SC is achieved in a 100 mm long
PCF pumped using 85 fs laser pulses operated at 3.1 μm and a peak pulse
power of 3 kW. The proposed design offers a flat dispersion profile with
two zero dispersion wavelengths. This broad and flat dispersion profile of
the Ge11.5As24Se64.5 PCF, combined with
the high nonlinearity (2474 W−1 km−1), generates an
ultra-broadband SC.
Citations
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TL;DR: In this article, the authors proposed an all-solid microstructured fiber composed only of hexagonal glass elements, which has an ultraflat all-normal dispersion profile, covering a wide wavelength interval of approximately 1.55μm.
Abstract: High flatness, wide bandwidth, and high-coherence properties of supercontinuum (SC) generation in fibers are crucial in many applications. It is challenging to achieve SC spectra in a combination of the properties, since special dispersion profiles are required, especially when pump pulses with duration over 100 fs are employed. We propose an all-solid microstructured fiber composed only of hexagonal glass elements. The optimized fiber possesses an ultraflat all-normal dispersion profile, covering a wide wavelength interval of approximately 1.55 μm. An SC spectrum spanning from approximately 1030 to 2030 nm (corresponding to nearly one octave) with flatness <3 dB is numerically generated in the fiber with 200 fs pump pulses at 1.55 μm. The results indicate that the broadband ultraflat SC sources can be all-fiber and miniaturized due to commercially achievable 200-fs fiber lasers. Moreover, the SC pulses feature high coherence and a single pulse in the time domain, which can be compressed to 13.9-fs pulses with high quality even for simple linear chirp compensation. The Fourier-limited pulse duration of the spectrum is 3.19 fs, corresponding to only 0.62 optical cycles.
52 citations
TL;DR: In this article, a Tm3+-doped fluoride glass with good thermal stability is prepared. And the results obtained indicate that the Tm 3+doped-fluoride glass can be a promising 2.0 μm laser glass material.
Abstract: In this work a Tm3+-doped fluoride glass with good thermal stability is prepared. Intensive 1.8 and 2.3 μm emissions are obtained when pumped by an 800 nm laser diode. And the 1.48 μm emission is limited because of the much strong radiation around 1.8 μm. On the basis of absorption spectrum, radiative properties are investigated and discussed according to Judd–Ofelt parameters (Ω2, Ω4, Ω6) calculated by Judd–Ofelt theory. Besides, absorption and emission cross-sections of 3
F
4 → 3
H
6 transition are figured out and analyzed by using McCumber and Beer–Lambert theories. The high gain around 1.8 μm was predicted by the large σemiτrad product (29.8 × 10–21 cm2 ms). The results obtained indicate that the Tm3+-doped fluoride glass can be a promising 2.0 μm laser glass material.
19 citations
TL;DR: In this paper, a Tm3+-doped silica-germanate was successfully prepared by high-temperature melting method in this work and compared with traditional silicate and germanate glasses comprehensively.
18 citations
TL;DR: In this article, tellurite glasses co-doped with Dy 3+ and Tm 3+ ions have been synthesized and their luminescence characteristics and energy transfer mechanism are investigated.
17 citations
TL;DR: In this article, a dual-cladding photonic crystal fiber (PCF) with elliptical As2S3 core has been proposed to obtain high birefringence and high nonlinearity in PCFs.
16 citations
References
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Dissertation•
30 Nov 2011
TL;DR: In this paper, the dispersion-engineered slow light photonic crystals in chalcogenide glasses have been used to enhance low power nonlinear operation, and a passive all-optical regenerator is proposed by integrating a slow-light photonic crystal waveguide with a band-pass filter based on coupled ring resonance.
Abstract: The growing speed and bandwidth requirements of telecommunication systems
demand all-optical on-chip solutions. Microphotonic devices can deliver
low power nonlinear signal processing solutions. This thesis looks at the slow
light photonic crystals in chalcogenide glasses to enhance low power nonlinear
operation.
I demonstrate the development of new fabrication techniques for this delicate
class of materials. Both, reactive ion etching and chemically assisted ion
beam etching are investigated for high quality photonic crystal fabrication.
A new resist-removal technique was developed for the chemical, mechanical
and light sensitive thin films.
I have developed a membraning method based on vapor phase etching
in combination with the development of a save and economical etching tool
that can be used for a variety of vapour phase processes.
Dispersion engineered slow light photonic crystals in Ge₃₃As₁₂Se₅₅ are designed
and fabricated. The demonstration of low losses down to 21±8dB/cm
is a prerequisite for the successful demonstration of dispersion engineered
slow light waveguides up to a group index of around n[subscript(g)] ≈ 40.
The slow light waveguides are used to demonstrate highly efficient third
harmonic generation and the first advantages of a pure chalcogenide system
over the commonly used silicon. Ge₁₁.₅As₂₄24Se₆₄.₅ is used for the fabrication
of photonic crystal cavities. Quality factors of up to 13000 are demonstrated.
The low nonlinear losses have enabled the demonstration of second and third
harmonic generation in those cavities with powers up to twice as high as
possible in silicon.
A computationally efficient model for designing coupled resonator bandpass
filters is used to design bandpass filters. Single ring resonators are
fabricated using a novel method to define the circular shape of the rings to
improve the fabrication quality. The spectral responses of the ring resonators
are used to determine the coupling coefficient needed for the design and fabrication
of the bandpass filters. A flat top bandpass filter is fabricated and
characterized as demonstration of this method.
A passive all-optical regenerator is proposed, by integrating a slow-light
photonic crystal waveguide with a band-pass filter based on coupled ring
resonators. A route of designing the regenerator is proposed by first using
the dispersion engineering results for nonlinear pulse propagation and then
using the filter responses to calculate the nonlinear transfer function.
3 citations