Brewster angle window

Also relying on light reflection to polarize light are Brewster angle windows based on the effect discussed in section 1.6. This type of window is also used in most laser cavities... 

Figure 9.9 Alignment of the polarization vector using a Brewster angle window.

FIGURE 9.6 Overview of the experimental apparatus for measuring laser-induced fluorescence and photodissociation action spectra of gas phase ions stored in a 3-D quadrupole ion trap. Optical component abbreviations Lenses (L1-L4) P-BaBj04 crystal (BBO) Mirrors (M1-M8) Shutter (Sh) Irises (Irl-lr2) Pinholes (PH1-PH2) Brewster-angle windows (BWl-BW2) Neutral density filter (ND) Long-pass filter (LP). L3 is inside the ring electrode (see Figure 9.7). 

Reflection losses. Whenever light is incident on an optical surface, such as a window, some small fraction is always reflected. Brewster angle windows and antireflection coatings (see Chapter 11) greatly reduce reflection losses but cannot eliminate them entirely. 

By placing these windows in a plane set at the Brewster angle with respect to the Ught beam, maximum transmission is assured (minimum reflection). The above considerations regarding polarization of refracted and reflected beams must be modified for nontransparent media such as metals, for which there is little polarization of a reflected beam. 

Brewing water, ozonation of, 17 807-808 Brewster angle, 14 670 Brewster s law, 14 857 Brewster windows, 14 682, 687 Brezinaite, 6 471t... 

The first concave mirror in Figure 20 is not essential, but in many experiments the energy density is increased by placing the experimental cell in a spherical concentric Fabry-Perot cavity. The windows of the experimental cell must be tilted at the Brewster angle to reduce the losses in the cavity. The length of this cavity is piezoelectrically locked on the Laser frequency, to maximize the signal transmitted throug it. 

Figure 4.2 Layout of a typical HeNe laser (and other gas laser) resonator. Normally, the laser tube is sealed by Brewster-angle-oriented windows in short-length HeNe alignment lasers, the resonator mirrors are directly attached tothelasertube...

A very high degree of linear polarization can be obtained for a laser with low losses in one direction of oscillation and high losses in the perpendicular direction. For a laser with a gas as the active medium this is accomplished by placing the windows of the gas container at the Brewster angle to the optical axis of the laser (Fig. 8.5). For other lasers some other type of polarizer can be placed inside the cavity. 

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