Wavelength dependence

The preparation of the reflecting silver layers for MBI deserves special attention, since it affects the optical properties of the mirrors. Another important issue is the optical phase change [ ] at the mica/silver interface, which is responsible for a wavelength-dependent shift of all FECOs. The phase change is a fimction of silver layer thickness, T, especially for T < 40 mn [54]. The roughness of the silver layers can also have an effect on the resolution of the distance measurement [59, 60]. 

Sun Y-P, Wang P and Hamilton N B 1993 Fluorescence spectra and quantum yields of Buckminsterfullerene (Cgg) in room-temperature solutions. No excitation wavelength dependence J. Am. Chem. Soc. 115 6378-81... 

The variation in absorbance with wavelength reflects the wavelength dependence of a. 

Transition Widths and Strengths. The widths and strengths of spectroscopic transitions determine the information that can be extracted from a spectmm, and are functions of the molecular parameters summarized in Table 2. Detectivity is deterrnined by spectral resolution and transition strength. Resolution, the abiUty to distinguish transitions of nearly equal wavelength, depends on both the widths of the spectral features and characteristics of the instmmentation. Unperturbed transitions have natural, Av widths owing to the intrinsic lifetimes of the states involved. The full width at... 

Nonblack or nongrey bodies are characterized by wavelength dependence of their spectral emissivity. Let be defined as the temperature of the body corresponding to the temperature of a black body. If the ratio of its radiant intensities at the wavelengths Xi, and Xo equals... 

Here, the wavelength of the laser light is A, and is a correction term due to the wavelength dependence of the refractive index of the etalon material ( = 0.034 at 514.5 nm when fused silica etalons are used to achieve the necessary delay, or = 0 when a lens combination is used). The optical correction term Av/v results from the change in refractive index of the window material with shock stress (Barker and Hollenbach, 1970). If the measure-... 

T he measurement principle, based on the ratio of the intensities, is insensitive to fluctuations in the source intensity. Changes associated with wavelength dependence can cause error in the measurement. 

Stimulated emission is quantified by the (wavelength dependent) excited state cross-section other processes are important, stimulated emission leads directly to amplification of light. In a material with a volume density fVcxc of excited 5 -states this amplification can be described by... 

Infrared (IR) thermography is one of the most advanced non-destructive (NDT) methods based on the fact that all bodies whose absolute temperature is above zero emit electromagnetic radiation over a wide spectrum of wavelengths depending on the temperature. Recently, several researchers have applied it to micro-scale temperature measurement. Hetsroni et al. (2001a) constructed a thermal micro-system... 

Grating spectroscopy makes use of the strong wavelength dependence (or dispersion) in the positions of the diffraction peaks. The width of the diffraction peak will give the resolution for a grating with N rulings, the closest minimum occurs at angle AO from a diffraction maximum. 

Figure 6. Chromatism is due to the wavelength dependence of the index of refraction and produces coloured, diffuse and/or elongated images. For simplicity reasons, the off-axis image in the figure above is shown with pure lateral chromatism in reality both axial and lateral chromatisms would combine.

Azuma, Y, Shibata, N, Horiguchi, T., Tateda,M., 1988, Wavelength dependence ofBrillouin-gain spectra for single-mode fibers, Electronics Letters, 24, 250 Beckers, J.M., 1993, Annu. Rev. Astron. Astrophys., 31, 13... 

If the core only corresponds to one speckle spot the fibre is monomode. Otherwise the waveguide is multimode. This back to the envelop calculation intuitively shows the origin of the mode number. Note that N is wavelength dependent the larger the wavelength, the lower the number of mode. 

Fig. 6-2 Comparison of infrared absorbance of a vertical column of atmospheric CO2 and H2O vapor. The nearly total absorbance by H2O between 5 and 7 /

Once the wavelength dependence of the molecular form factor F(nqo) is known from the reasonable model of layer organization, the ratios r /ti may be calculated. The value of these ratios (for example, T2/T1, T3/T1) give a good guide to the sharpness of the distribution function f(z) - for an ideal crystal f(z) would be an array of delta-functions and T2 = Ti = = = 1. From the... 

Values for degassed solutions. "With one atmosphere cyclohexane. N,N-dlmethyl-l-naphthylamlne. Trans-1,6-dlphenyl-l, 3,5-hexatrlene. Average of 13 literature values (see Ref. 50). Values from many authors agree for a single exponential, but there appear to be two exponentials that show wavelength dependence. 2,5-Dlphenyloxazole. "p-Bls(2-phenylozazolyl)benzene. Decay time dependent on Cl or I" concentration. 

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