Gentec-EO Accessories for Beam Diagnostics - Manual (Page 13)

Accessories for Beam Diagnostics Revision 1.2 13
3.2. BDA-S-1000-40W-VIS/IR – BEAM SAMPLER
The BDA-S-1000-40W-VIS/IR beam sampler uses Fresnel reflection to pick off a small fraction of the input beam
(0.09%). Within the 400 nm
– 2500 nm range, it provides a fixed 10 3
(30 db) attenuation that weakly depends on
wavelength. Its two orthogonal optical wedges preserve the incoming beam polarization state and eliminate
ghosting and multiple reflections interferences. Irradiance profile is preserved, wavefront distortion is negligible
and laser output power stability is not affected.
The BDA-S-1000-40W-VIS/IR beam sampler has four ports:
“Input”, “Sampled Beam”, “Residual Beam" and "Port
4".
More than 90% of incident light is transmitted through the beam sampler (residual beam). Therefore, an
appropriate beam-dumping device should be placed behind the residual beam port to ensure the beam sampler is
operated safely. This optical component can be easily combined with the BDA-A-VAR variable attenuator.
The BDA-S-1000-40W-VIS/IR can be connected to the Beamage-3.0 via a male to male C-mount connecting
tube.
Figure 8: BDA-S-1000-40W-VIS/IR Beam Sampler
Table 7: BDA-S-1000-40W-VIS/IR Beam Sampler Specifications
Spectral Range 400 nm – 2500 nm
Average Attenuation 10
3
(30 db)
Maximum Power Range 40 W
Aperture Diameter 17.5 mm
Max Beam Diameter 15 mm
Optical Wedges Material UV Fused Silica
Refractive Index ( λ = 532 nm) 1.4607
Refractive Index ( λ = 1064 nm) 1.4496
Sampled Beam Lateral Shift 15 mm
Sampled Beam Deviation 90°
Residual Beam Deviation 5°
Part Number 202345