TES arrays for the short wavelength band of the SAFARI instrument on SPICA

2012 ◽  
Author(s):  
P. Khosropanah ◽  
R. Hijmering ◽  
M. Ridder ◽  
J. R. Gao ◽  
D. Morozov ◽  
...  
Keyword(s):  
Short Wavelength ◽  
Wavelength Band ◽  
Short Wavelength Band

Characterization of Low Noise TES Detectors Fabricated by D-RIE Process for SAFARI Short-Wavelength Band

2014 ◽  
Vol 176 (3-4) ◽  
pp. 363-369 ◽  
Author(s):  
P. Khosropanah ◽  
T. Suzuki ◽  
R. A. Hijmering ◽  
M. L. Ridder ◽  
M. A. Lindeman ◽  
...  
Keyword(s):  
Short Wavelength ◽  
Low Noise ◽  
Wavelength Band ◽  
Short Wavelength Band ◽  
Tes Detectors

scholarly journals Effects of chromophore interaction in photophysics and photochemistry of cyanine dyes

2000 ◽  
Vol 2 (1) ◽  
pp. 23-30 ◽  
Author(s):  
A. S. Tatikolov ◽  
Zh. A. Krasnaya ◽  
L. A. Shvedova ◽  
V. A. Kuzmin
Keyword(s):  
Absorption Spectra ◽  
Short Wavelength ◽  
Ion Pairs ◽  
Polymethine Dyes ◽  
Wavelength Band ◽  
Fluorescent Properties ◽  
Anionic Dyes ◽  
Short Wavelength Band ◽  
Fluorescence Excitation ◽  
Chromophore Interaction

Spectral and fluorescent properties of ketocyanine dyes (polyenic bis-ω,ω′-aminoketones) and cation-anionic polymethine dyes of various structures were studied. The symmetric ketocyanines were shown to have a long-wavelength absorption band bathochromically shifted in comparison with that of the asymmetric ketocyanines with the same total length of the polyenic chain. The nonlinear ketocyanines exhibit the additional short-wavelength band in their absorption spectra, which can be more intense than the longwavelength band. The absorption spectra of ion pairs of cation-anionic dyes with overlapping cation and anion bands contain a new intense short-wavelength band inactive in fluorescence excitation. These spectral peculiarities are explained on the basis of chromophore interaction model. It has also been shown that theT1levels of ketocyanine chromophores do not essentially interact with each other in a ketocyanine molecule in nonpolar solvents; in polar solvents this interaction becomes appreciable due to lowering the potential barrier for conjugation.

S-BAND BRILLOUIN/ERBIUM FIBER LASER FOR DWDM APPLICATION

2006 ◽  
Vol 15 (03) ◽  
pp. 309-313 ◽  
Author(s):  
SULAIMAN WADI HARUN ◽  
CHENG XIAU SAN ◽  
HARITH AHMAD
Keyword(s):  
Fiber Laser ◽  
Wavelength Division Multiplexing ◽  
Wavelength Band ◽  
Short Wavelength Band ◽  
Wavelength Division ◽  
Optical Wavelength ◽  
Brillouin Pump ◽  
Erbium Doped ◽  
Multi Wavelength ◽  
Output Laser

A multi-wavelength Brillouin erbium fiber laser (BEFL) which operates in a short wavelength band (S-Band) is demonstrated using a depressed cladding erbium-doped fiber (EDF). Two 80/20 couplers were used in the system for internal feedback of generated stokes signal in order to produce cascaded Brillouin stokes for multi-wavelength operation. It generates an optical wavelength comb with spacing of approximately 0.084 m. A stable output laser of up to 7 lines was obtained with a Brillouin pump of 3.5 mW, a 980 nm pump laser of 200 mW and an EDF length of 20 m. The BEFL has the potential to be used in the future dense wavelength division multiplexing (DWDM) communication system.

The Red-Edge Effects in Laurdan Solutions

2003 ◽  
Vol 58 (2-3) ◽  
pp. 109-117 ◽  
Author(s):  
V. I. Tomin ◽  
J. Heldt
Keyword(s):  
Strong Dependence ◽  
Solvent Molecule ◽  
Time Range ◽  
Wavelength Band ◽  
Short Wavelength Band ◽  
Band Shape ◽  
Excitation Spectra ◽  
Additional Absorption ◽  
Small Shift ◽  
Red Edge

The luminescence spectrum of laurdan in glycerol consists of two bands with maxima at 425 and 500 nm. The strong dependence of this spectrum on the energy of the excitation quanta is demonstrated. When, excited on the red-edge slope of the absorption band, it is investigated at various temperatures. The biggest red shift (about 10 nm) of λmax is found for the long wavelength band at low temperature, where the solvent forms a rigid matrix. A small shift, about 3 - 4 nm, and a change of the luminescence band shape occurs on increasing the temperature to 370 K. Simultaneously, intensity changes occur in the excitation spectra when the maximum intensity of the two emission bands is recorded. From the received data, the differential excitation spectrum has been determined. The additional absorption contributes to the luminescence of the short wavelength band. The deconvolution of the luminescence decay data obtained separately for the luminescence bands results in common components in the sub- and nanosecond time range with different participation. The experimental data testify the presence of an additional mechanism, responsible for the heterogeneity of the solution, which differs from the well-known solvent molecule reorientation. Torsion oscillation of the N(CH3)2 functional group in the laurdan molecule is necessary to take into account as well as the statistical properties of the laurdan solvate shells. The observed luminescence properties are explained taking into account the simultaneous existence of local-excited and charge transfer states in the solute molecules.

scholarly journals Ultra-short wavelength operation of a thulium fibre laser in the 1660–1750 nm wavelength band

2015 ◽  
Vol 23 (14) ◽  
pp. 18269 ◽  
Author(s):  
J. M. O. Daniel ◽  
N. Simakov ◽  
M. Tokurakawa ◽  
M. Ibsen ◽  
W. A. Clarkson
Keyword(s):  
Short Wavelength ◽  
Fibre Laser ◽  
Wavelength Band

Photochemical Processes in a Copolymer of 2-(2'-Hydroxy-4'-methacryloyloxyphenyl)-2H-benzotriazole and Methyl Methacrylate

1994 ◽  
Vol 47 (8) ◽  
pp. 1461 ◽  
Author(s):  
R Dux ◽  
KP Ghiggino ◽  
O Vogl
Keyword(s):  
Excited State ◽  
Methyl Methacrylate ◽  
Arrhenius Plot ◽  
Emission Spectra ◽  
Intramolecular Proton Transfer ◽  
Wavelength Band ◽  
Temperature Dependent ◽  
Short Wavelength Band ◽  
Intramolecular Hydrogen ◽  
Hydrogen Bonded

The temperature-dependent (10-300 K) fluorescence behaviour of films of a copolymer of 2-(2′-hydroxy-4′-methacryloyloxyphenyl)-2H-benzotriazole and methyl methacrylate (HMPB-co-MMA) has been studied. The emission spectra consist of a short-wavelength band and a highly Stokes-shifted emission with maxima at 390 and 550 nm respectively. The temperature- insensitive 390 nm emission is assigned to a non- intramolecular hydrogen-bonded form of HMPB while the red-shifted emission is due to the species formed following excited-state intramolecular proton transfer. The temperature dependence of the 550 nm fluorescence is complex and does not allow a linear Arrhenius plot. Possible mechanisms for the temperature-dependent deactivation processes are proposed. Irradiation studies indicate that the non-planar HMPB entities are more photolabile than the intramolecularly hydrogen-bonded form. The relevance of the results to the application of HMPB as an ultraviolet absorber and photostabilizer in polymers is discussed.

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