Nonlinear optics in space

2000 ◽  
Vol 78 (5-6) ◽  
pp. 461-481 ◽  
Author(s):  
P P Sorokin ◽  
J H Glownia
Keyword(s):  
Nonlinear Optics ◽  
Infrared Emission ◽  
Absorption Bands ◽  
Detailed Model ◽  
Interstellar Absorption

A detailed model for nonlinear photoexcitation of H2 in space is proposed and considered at length. It is shown that, on the basis of this model, one is able to provide at least partial explanations for three famous astrophysical spectral mysteries pertaining to our galaxy. These concern the carrier identities of the Diffuse Interstellar (Absorption) Bands (DIBs), the Unidentified Infrared (Emission) Bands (UIBs), and the visible bands emitted by the Red Rectangle nebula.PACS Nos.: 95.30Gv, 33.70-w

Origin of the Diffuse Interstellar Absorption Bands

Nature ◽  
1968 ◽  
Vol 218 (5137) ◽  
pp. 153-153 ◽  
Author(s):  
W. W. DULEY
Keyword(s):  
Absorption Bands ◽  
Interstellar Absorption

scholarly journals Two-photon excited deep-red and near-infrared emissive organic co-crystals

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu Wang ◽  
Huang Wu ◽  
Penghao Li ◽  
Su Chen ◽  
Leighton O. Jones ◽  
...  
Keyword(s):  
Cross Sections ◽  
Optical Materials ◽  
Near Infrared ◽  
Infrared Emission ◽  
Photon Absorption ◽  
Electromagnetic Spectrum ◽  
Absorption Bands ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Near Infrared Emission

Abstract Two-photon excited near-infrared fluorescence materials have garnered considerable attention because of their superior optical penetration, higher spatial resolution, and lower optical scattering compared with other optical materials. Herein, a convenient and efficient supramolecular approach is used to synthesize a two-photon excited near-infrared emissive co-crystalline material. A naphthalenediimide-based triangular macrocycle and coronene form selectively two co-crystals. The triangle-shaped co-crystal emits deep-red fluorescence, while the quadrangle-shaped co-crystal displays deep-red and near-infrared emission centered on 668 nm, which represents a 162 nm red-shift compared with its precursors. Benefiting from intermolecular charge transfer interactions, the two co-crystals possess higher calculated two-photon absorption cross-sections than those of their individual constituents. Their two-photon absorption bands reach into the NIR-II region of the electromagnetic spectrum. The quadrangle-shaped co-crystal constitutes a unique material that exhibits two-photon absorption and near-infrared emission simultaneously. This co-crystallization strategy holds considerable promise for the future design and synthesis of more advanced optical materials.

scholarly journals Optical and Chemical Studies on Simulated Interstellar Grain Materials

1973 ◽  
Vol 52 ◽  
pp. 327-333
Author(s):  
J. D. McCullough ◽  
G. R. Floyd ◽  
R. H. Prince ◽  
W. W. Duley
Keyword(s):  
Wavelength Range ◽  
Absorption Bands ◽  
Interstellar Absorption ◽  
Interstellar Grains ◽  
Chemical Studies ◽  
Radiation Induced ◽  
Absorption Features ◽  
Important Constituent

The possibility that many different diffuse interstellar absorption features may be produced by the same type of absorbing atom in different hydrocarbon matrices on interstellar grains has been examined experimentally. The present study shows that absorption bands due to Na atoms in various hydrocarbon matrices can occur within the wavelength range 5400–5800 Å. A study of the molecules generated from the radiation-induced polymerization of C2H2 at 55 K is also reported. It is shown that C6H6 is an abundant product of this polymerization and may therefore be an important constituent of interstellar grains.

Origin of the diffuse interstellar absorption bands

1977 ◽  
Vol 47 (1) ◽  
pp. 185-193 ◽  
Author(s):  
W. W. Duley
Keyword(s):  
Absorption Bands ◽  
Interstellar Absorption

Detection of two interstellar absorption bands coincident with spectral features of C60+

Nature ◽  
1994 ◽  
Vol 369 (6478) ◽  
pp. 296-298 ◽  
Author(s):  
B. H. Foing ◽  
P. Ehrenfreund
Keyword(s):  
Spectral Features ◽  
Absorption Bands ◽  
Interstellar Absorption

Diffuse interstellar absorption bands

2009 ◽  
Vol 52 (4) ◽  
pp. 489-501 ◽  
Author(s):  
FuYuan Xiang ◽  
ShunLin Liang ◽  
AiGen Li
Keyword(s):  
Absorption Bands ◽  
Interstellar Absorption

scholarly journals Nonlinear Optics in Silicon Wire Waveguides: Towards Integrated Long Wavelength Light Sources

2012 ◽  
Vol 1437 ◽  
Author(s):  
Bart Kuyken ◽  
Xiaoping Liu ◽  
Richard M. Osgood ◽  
Roel Baets ◽  
Gunther Roelkens ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Silicon Nanowire ◽  
Wavelength Region ◽  
High Sensitivity ◽  
Silicon On Insulator ◽  
Light Sources ◽  
Absorption Bands ◽  
Central Wavelength ◽  
Mid Infrared ◽  
Long Wavelength

ABSTRACTMost of the research on silicon-on-insulator integrated circuits has been focused on applications for telecommunication. By using the large refractive index of silicon, compact complex photonic functions have been integrated on a silicon chip. However, the transparency of silicon up to 8.5 μm enables the use of the platform for the mid infrared wavelength region, albeit limited by the absorption in silicon oxide from 4 μm on. This could lead to a whole new set of integrated photonics circuits for sensing, given the distinct absorption bands of many molecules in this wavelength region. These long wavelength integrated photonic circuits would preferably need broadband or widely tunable sources to probe these absorption bands.We propose the use of nonlinear optics in silicon wire waveguides to generate light in this wavelength range. Nonlinear interactions in just a few cm of silicon wire waveguides can be very efficient as a result of both the high nonlinear index of silicon and the high optical confinement obtained in these waveguides. We demonstrate the generation of a supercontinuum spanning from 1.53 μm up to 2.55 μm in a 2 cm dispersion engineered silicon nanowire waveguide by pumping the waveguide with strong picoseconds pulses at 2.12 μm [1]. Furthermore we demonstrate broadband nonlinear optical amplification in the mid infrared up to 50 dB [2] in these silicon waveguides. By using this broadband parametric gain a silicon-based synchronously pumped optical parametric oscillator (OPO) is constructed [3]. This OPO is tunable over 70 nm around a central wavelength of 2080 nm.Finally, we also demonstrate the use of higher order dispersion terms to get phase matching between optical signals at very different optical frequencies in silicon wire waveguides. In this way we demonstrate conversion of signals at 2.44 μm to the telecommunication band with efficiencies up to +19.5 dB [4]. One particularly attractive application of such wide conversion is the possibility of converting weak signals in the mid-IR to the telecom window after which they can be detected by a high-sensitivity telecom-band optical receiver.

The 10- and 20-?m interstellar absorption bands: Comparison with the infrared spectrum of the Nogoya meteorite

1979 ◽  
Vol 60 (2) ◽  
pp. 297-304 ◽  
Author(s):  
C. Friedemann ◽  
J. G�rtler ◽  
J. Dorschner
Keyword(s):  
Infrared Spectrum ◽  
Absorption Bands ◽  
Interstellar Absorption
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