Spectrally incoherent input beam Sample Clauses

Spectrally incoherent input beam. A LED, with a central wavelength λ = 525 nm and a spectral width of 36 nm (FWHM), is used for incoherent illumination of the Xxxxx-Xxxxx. The mirrors of the resonator are identical to those used in Section 2.2. The cavity length is approximately 10 cm and the cavity is operated far from (lower-order) frequency-degenerate points (see Chapter 5). To operate the resonator at the same wavelength as with a coherent light source (λ = 532.0 nm), a spectral filter (λ = 532.0 nm, ΔλFWHM = 3.5 nm) is placed in front of the LED. For a proper performance of the experiment, it is important to convert the highly-diverging light coming out of the LED into a more or less parallel beam. We want the light to remain paraxial inside the resonator even after multiple round-trips. This is done in two steps, where A A Ti T T
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