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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.
 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 |
Note:
special wavelengths within the range of 200-2300nm are also available upon
request.
Standard Specifications
| Material: |
Crystal quartz |
| Dimension Tolerance: |
+0.0, -0.2mm |
| Wavefront Distortion: |
<l/8@632.8 |
| Retardation Tolerance: |
<l/500 |
| Wavelength Range: |
240-2100 nm |
| Parallelism: |
<1 arc second |
| Surface Quality: |
20/10 scratches & dig |
| Coating: |
R<0.2% on both surfaces at central
wavelength |
Ordering
information for standard products
Part No, -
wavelength - Retardation
For Example, WPS110 - 1550 - l/2
Ordering
Information for None Standard Products
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