As example, the film system of narrow\|band filter with center wavelength of 1.55 μm and bandwidth of 4 nm has been designed practically by genetic algorithms.
For a 100GHz filter, simulated result was that center wavelength and bandwidth decreased by 0.977nm and 0.19nm,respectively when the thickness of substrate is reduced from 10mm to 1.0mm.
Zirconium oxide (ZrO_2) coatings for 632.8nm center wavelength were deposited on the Ag layer by electron beam evaporation, optical thickness of which varied in the range of 80—480nm.
Above all, we carry out study of improving uniformity of period thickness spatial distribution, and develop correction mask for controlling period thickness. As a result, we improve uniformity from 4.5% to 2.0%, the error of period thickness on (130nm field is controlled within 0.18nm,and the reflectivity reach 35% at center wavelength 17.1nm.
The change of the transmittance curve of the all dielectric narrow band filter caused by the substrate position difference is analyzed. The conclusion is that the shape of the transmittance curve has been basically holding the line with the center wavelength deviation.
The absolute reflectance and frequency-tunable range at 355nm are R=99.45% andΔλ(R≥99.00%)=75nm, respectively, for the broadband resonator mirror. For the mirror with the dual-central wavelengths, R=99.69% andΔλ(R≥99.00%)=59nm for the first band at 355nm;
And anode current of the ion source affected the spectral shift . From 1.4A to 2.6A, the spectral shift of Ta2O5/SiO2 narrow band interference filters dropped from 10nm to 5nm.
The photoluminescence (PL) spectrum centered at 1.533 μm with the full width at half maximum of 36 nm is observed for the 0.01 Er 3+ doped γ Al 2O 3 film, which is attributed to the intra 4f transition between the first excited ( 4I 13/2 ) and the ground state ( 4I 15/2 ) of Er 3+ .
For a center wavelength of FBG of about 1550 nm and a 40 nm shift range of its reflection wavelength, the relative error of measurement is only ± 0.001.
The wavelength of the light source is modulated at a frequency of 10?kHz, and the center wavelength is stabilized at the center of the 2ν3 band R(3) line of methane (1.65372?μm).
Based on electromagnetics wave theory the optimum optical matching condition of single-layeranti-reflective coatings with true semiconductor solar cells having a large absorptive coefficient is defined strictly in this peper, Two physical parameters: the real refractive index Ns (λ) and the extinction coefficient τ(λ), are used here to describe theoretically the macroscopic optical properties of semiconductor. Results of computer optimization of a-Si and GaAs solar cells based on this theory show that for s...
The influence of oblique incidence on the optical properties of thin film is discussed in the paper.Authors propose that the uniform distribution of film layer on ellipsoid color cold light mirror differs from the uniform distribution of the parallel plane thin film.The film layer distribution at the same peripheral direction should be equal thick and the film layer at the axial direction from the mirror center to the mirror edge should be thickened gradually.The calculation results show that the gradual th...
Microstrcture and optical properties of Ge nanocrystallites embedded in SiO 2 thin films prepared by the ion beam sputtering technique have been studied. Effects of the quantum confinement and the dielectric confinement of the specimens on optical absoption spectra and the photoluminescence spectra have been discussed.
中心波长
center wavelength 
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