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We fabricate these from selected natural and synthetic crystalline quartz, and other crystals depending upon wavelength. All of our quartz Retarders are multilayer antireflection coated on both sides so that transmittance exceeds 99% at the design wavelength. Precision of retardation is guaranteed to be within ¼% of design value. Transmitted wavefront is better than 1/10-wave across the full aperture. We calibrate every Retarder which is shipped out. We will furnish upon request, and at no additional charge, the calibrated value of any plate. Aperture is 15 mm in 1" cell with scribed line indicating slow axis. Surface quality 10/5 or better, flatness better than 1/20 wave, parallel better than 2 seconds.


MULTIPLE-ORDER RETARDERS, Crystalline quartz
This is the single plate Retarder, and is no more nor less accurate than the zero order type under ordinary laboratory conditions. They will display more sensitivity to temperature change than the zero-order type. These Retardation Plates are precision polished to achieve the desired retardation at the desired wavelength. Aperture is 15 mm.

The high dispersion of refraction index at shorter wavelengths narrows both angular aperture and bandwidth. Thus, we limit our multiple-order Retarders to 400 nm and longer wavelengths. For UV excimer lasers, we recommend our more tolerant zero-order Retarders (see next page). Both sides are AR coated.

We manufacture Retarders from 3.6 µm to 7.0 µm on a custom basis in MgF2 crystal. Please inquire.

Change in phase retardation (Df) relates to bandwidth, field of view and temperature change, using a 1 mm thick plate. Temperature stability describes the change in phase retardation per °C of temperature change.

Specifications
Aperture: Clear aperture 15mm mounted in 1" OD cell
Substrate Material Crystal quartz
Transmitted Wavefront λ/10 at 633nm
Surface Quality 10-5 laser quality
Diameter Tolerance + 0.00mm, - 0.25mm
Parallelism 0.5 seconds
Retardation Tolerance 0.25% of design value at 20C

Quarter-wave Retarders

Catalog Number
&Wavelegth
Aperture
Bandwidth
Field
of View
Temp.
Stability (Df/C)
RM--488
15 mm
0.1 nm
1.0
0.02
RM--514
15 mm
0.1 nm
1.0
0.019
RM-¼-532
15 mm
± 0.1 nm
± 1.0°
0.019
RM--633
15 mm
0.1 nm
1.0
0.018
RM--780
15 mm
0.2 nm
1.2
0.018
RM--980
15 mm
0.3 nm
1.4
0.017
RM--1053
15 mm
0.4 nm
1.5
0.017
RM--1064
15 mm
0.4 nm
1.5
0.016
RM--1310
15 mm
0.5 nm
1.6
0.016
RM--1480
15 mm
0.7 nm
1.8
0.015
RM--1550
15 mm
0.7 nm
1.8
0.015
RM--1560
15 mm
0.7 nm
1.8
0.015
*Value assumes a tolerable phase retardation error of 1%
MANY MORE WAVELENGTHS IN STOCK.
IF NOT, WE’LL MAKE IT.

Half-wave Retarders

Catalog Number
&Wavelegth
Aperture
Bandwidth
Field
of View
Temp.
Stability (Df/C)
RM-½-488
15 mm
0.1 nm
1.3
0.019
RM-½-514
15 mm
0.2 nm
1.4
0.019
RM-½-532
15 mm
± 0.2 nm
± 1.4°
0.019
RM-½-633
15 mm
0.2 nm
1.6
0.018
RM-½-780
15 mm
0.4 nm
1.8
0.018
RM-½-980
15 mm
0.6 nm
2.0
0.017
RM-½-1053
15 mm
0.7 nm
2.1
0.017
RM-½-1064
15 mm
0.7 nm
2.1
0.016
RM-½-1310
15 mm
1.0 nm
2.3
0.016
RM-½-1480
15 mm
1.3 nm
2.4
0.015
RM-½-1550
15 mm
1.7 nm
2.7
0.015
RM-½-1560
15 mm
1.7 nm
2.7
0.014
*Value assumes a tolerable phase retardation error of 1%
MANY MORE WAVELENGTHS IN STOCK.
IF NOT, WE’LL MAKE IT.

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