Multi Order Waveplates – Dual Wavelength
Half wave retardation at Wavelength 1
- Full wave retardation at Wavelength 2
These dual wavelength multiple order waveplates are made a piece of quartz which has been precisely polished. Its thickness is controlled to provide half wave retardation at one wavelength and full wave retardation at a second wavelength. They are offered for Nd:YAG harmonic wavelengths and can be used to separate the harmonic beams by means of a change in their state of polarization. A half wave plate has a net retardation of pi and rotates the plane of polarization by 90deg. A full wave plate has a net retardation of 2 pi and rotates the plane of polarization by 180deg. The two harmonics will therefore emerge with crossed linear polarizations. Optionally, these waveplates may be supplied mounted in a metal ring.
Material: |
Crystal Quartz |
Surface Quality |
<10 / 5 |
Transmitted Wavefront: |
< λ / 10 @ 633 nm |
Diameter: |
< 25.4=0.00 / – 0.20 mm |
Thickness: |
t = approximately 1.0 mm |
Polarization state purity: |
98% |
Retardation @ λ1: |
λ / 2 |
Retardation @ λ2: |
λ |
Parallelism: |
<1.0 arc sec |
Clear Aperture: |
20.0 mm |
Mount OD: |
38.1 mm |
AR Coating |
R < 0.25% per surface |
Multi Order Waveplates – Dual Wavelength