Physics2010.03.02 21:02

Quarter waveplate are used to turn plane-polarized light into circularly polarized light and vice versa. To do this, we must orient the wave plate so that equal amounts of fast and slow waves are excited. We may do this by orienting an incident plane-polarized wave at 45 to the fast (or slow) axis, as shown in Figure 2. When a l/4 plate is double passed, i.e., by mirror reflection, it acts as a l/2 plate and rotates the plane of polarization to a certain angle, i.e., 90.   This scheme is widely used in isolators, Q-switches, etc.
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The thickness of the quarter waveplate is such that the phase difference is 1/4 wavelength (l/4, Zero order) or certain multiple of 1/4-wavelength [(2n+1)l/4, multiple order].
Red Optronics provides standard waveplate with  wavelengths (nm) per following:

355
532
632.8
808
850
980
1064
1310
1480
1550
1590

출처 : Optical Components

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