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Delay Plates
Halbo Optics is closed for business - see Homepage
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Delay plates, which are essentially thick retarders, can be used to produce two half power pulses, separated by a defined interval, from one input pulse. The input plane of polarization is at 45° to the optic axis. In the plate, the input pulse is resolved into collinear ordinary and extraordinary pulses. These propagate at different group velocities, resulting in a separation between them in air. Delay plates are supplied manufactured from both quartz and calcite. The orientation of the optic axis is indicated by a small flat.
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The time interval Δt is given by:
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Δt = Δn.d/c
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where:
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Δn = birefringence
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d = plate thickness
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c = velocity of light
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The spatial separation in air D is then:
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D = Δn.d
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Mounts
Delay plates can be supplied mounted (Type 3 or Type 2, depending on thickness). To specify mounted delay plates, simply add suffix:
M3 for Type 3 mount for component thicknesses up to 2mm
M2 for Type 2 mount for component thicknesses over 2mm
RM5 for Type 5 rotation mount for component thicknesses over 2mm
Specifications
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All Components
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Peak Transmission (%)
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92
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Flatness @NaD
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lambda/8
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Beam deviation (min)
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<3
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Max Peak Power (MW/cm2)
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200
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Max CW Power (W/cm2)
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100
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Model #
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Material
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Spectral Range (nm)
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Aperture (mm)
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Thickness (mm)
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Interval @550nm (ps)
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Separation @550nm (mm)
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Quartz Delay Plates
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DPQX-1
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Quartz
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190-2600
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X
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1
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30
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9
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DPQX-2
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Quartz
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190-2600
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X
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2
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60
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18
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DPQX-5
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Quartz
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190-2600
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X
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5
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150
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45
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DPQX-10
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Quartz
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190-2600
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X
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10
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300
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90
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Calcite Delay Plates
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DPCX-1
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Calcite
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220-2000
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X
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1
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570
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170
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DPCX-2
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Calcite
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220-2000
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X
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2
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1140
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340
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DPCX-5
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Calcite
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220-2000
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X
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5
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2850
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850
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DPCX-10
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Calcite
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220-2000
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X
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10
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5700
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1700
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Standard Delay Plates
The product codes below are examples manufactured from calcite, which can also be manufactured from quartz (replace C with Q in the product code). Standard delay plates are circular, with the optic axis indicated by a small flat. If required, they can be supplied square with the optic axis along a diagonal to special order.
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Model #
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Aperture (mm)
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Thickness (mm)
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Mount Dia. (mm)
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DPC10-1
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10
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1
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25.4
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DPC10-2
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10
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2
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25.4
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DPC10-5
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10
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5
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25.4
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DPC10-10
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10
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10
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25.4
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DPC12-1
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12
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1
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25.4
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DPC12-2
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12
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2
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25.4
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DPC12-5
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12
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5
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25.4
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DPC12-10
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12
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10
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25.4
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DPC15-1
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15
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1
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25.4
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DPC15-2
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15
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2
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25.4
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DPC15-5
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15
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5
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25.4
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DPC15-10
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15
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10
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25.4
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DPC20-1
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20
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1
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31.8
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DPC20-2
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20
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2
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31.8
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DPC20-5
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20
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5
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31.8
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DPC20-10
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20
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10
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31.8
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Custom Delay Plates
If the plate you require is not listed here, we can manufacture a custom special. Simply specify the aperture, time interval or separation and wavelength of operation.
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