Wavelength cutoff critical

The optical response of an SC is critically controlled by its energy band gap Eg), which gives the threshold energy for an electronic transition from the VB to the CB [59], which in molecular terms can be consider as a transition from HOMO to LUMO [60]. The values of Eg and the corresponding wavelength cutoff limits for the SCs under consideration in this article are listed in Table 1. 

In and of itself, the UV cutoff is typically not a critical parameter on which to base solvent selection. Rather, the UV cutoff is a rapid way of assessing whether or not the gross characteristics of the solvents (1) make it an appropriate choice based on the system s operating wavelength, and (2) have changed from lot to lot. Most manufacturers provide this datum for each lot of solvent as part of the printed label afBxed to each solvent bottle, since it is an easy test to perform. 

Figure 3.3 shows the dependence of critical electric field in a mercury cadmium telluride detector (Ej it in expression (3.9)) versus cutoff wavelength for three different temperatures. 

Fig. 3.3 Critical electric field in nonequilibrium HgCdTe deteetor versus cutoff wavelength at different operating temperatures...

Step 6— Testing. Often the coated fiber is continuously proof-tested for strength on the draw tower or as it is rewound onto other spools. Optical testing is also critically important. For multimode fibers the tests include attenuation, bandwidth, numerical aperture, and core diameter for single mode they include such additional characteristics as chromatic dispersion, cutoff wavelength, and mode field diameter. 

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