Semrock

Property

Value

Comment

Reflection

> 98% (s-polarization)
> 90% (p-polarization)
> 94% (average polarization)

Absolute reflectivity over the specified laser
wavelengths/bands

Transmission

> 93%

Averaged over the transmission passband

Passband Wavelength Range

See table in BrightLine Laser Dichroics Page

Angle of Incidence

45.0°

Range for above optical specifications
Based on a collimated beam of light

Dependence of Wavelength on Angle of Incidence (Edge Shift)

0.35% / degree

Linear relationship valid between about
40° and 50°

Cone Half Angle (for non-collimated light)

< 0.5°

Rays uniformly distributed and centered at 45°

Substrate Material

Fused silica

Ultra-low autofluorescence

Coating Type

"Hard" ion-beam sputtered

Clear Aperture

> 80%

Elliptical

Size

25.2 mm x 35.6 mm (± 0.1 mm)

Unmounted

Thickness

1.05 ± 0.05 mm

Transmitted Wavefront Error

< l / 4 RMS at l = 633 nm

Peak-to-valley error < 5 x RMS

Beam Deviation

£ 10 arc seconds

Edge Chipping

< 0.1 mm

Measured from substrate edge

Surface Quality

60-40 scratch-dig

As per MIL-C-48497A

Second Surface

Anti-reflection (AR) coated

Flatness

Reflection of a collimated, gaussian laser beam with waist diameter up to 2.5 mm causes
less than one Rayleigh Range of focal shift after the objective or a focusing lens.

Reliability and Durability

Ion-beam-sputtered, hard-coated technology with epoxy-free, single-substrate construction for
unrivaled filter life and no "burn-out" even when subjected to high optical intensities for a
prolonged period of time. BrightLine filters are rigorously tested and proven to MIL-STD-810F and MIL-C-48497A environmental standards.

Orientation

"Reflective coating side" should face toward light source and sample; see diagrams below.

Microscope Compatibility

BrightLine filters are available to fit Leica, Nikon, Olympus, and Zeiss microscopes.

Orientation of filters in a microscope: Because BrightLine filters are so durable, you can easily populate your own cubes, sliders, and filter wheels without having to worry about damaging the filters. To obtain the most optimal performance from the filters, they should be oriented properly. The diagrams below explain the proper orientation.

Proper orientation of all filters

The exciter and emitter should be oriented so that the arrow on the side of the aluminum ring points in the direction of propagation of the desired light – from the light source to dichroic for the exciter and from the dichroic to eye or camera for the emitter. The dichroic should be oriented such that the reflective coating side faces toward the exciter or light source and the sample.

Dichroic beamsplitter "reflective coating side"

Marked Dichroics

		If the dichroic has a small linear mark, the reflective coating side is facing you when the mark is vertical (parallel to the long side) and in the lower right corner.

Unmarked Dichroics

		When viewing the dichroic with the reflective coating side down, you can see a double-reflection of a bright object and the thickness of the filter at the far edge is apparent.

		When viewing the dichroic with the reflective coating side up, you can see a predominantly single reflection of a bright object and the thickness of the filter at the far edge is not visible.