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Beam Sampling System, 190-1550 nm, LBP2
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Beam Sampling System, 1064 nm, LBP2
2 Weeks
2 Weeks
Beam Sampling System, 266-355 nm, LBP2
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Beam Sampling System, 400-700 nm, LBP2
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In Stock


Beam Samplers for Real Time Beam Monitoring for High Power Input

The LBP2-SAM Series beam sampler is designed so that the preferential polarization selection effect of a single wedge is cancelled out and the resulting beam image is polarization corrected to restore the polarization components of the original beam. The beam sampler operates by reflecting the incoming beam from the front surfaces of a pair of wedges through 90 degrees into the camera. The wedges for the UV, VIS, and IR are AR coated for the appropriate operating wavelength ranges.  The wedges for the broadband BB model are uncoated. For the UV, VIS, and IR models, approximately 99% of the beam is transmitted through the beam sampler with 0.01% passed on to the camera.  For the BB model, approximately 95% of the beam is transmitted through the beam sampler with 0.25% passed on to the camera.  Also, two samplers can be coupled in series providing up to a 10-8 attenuation (6 X 10-6 for BB).

LBP2-SAM mounted on an LBP2 laser beam profiler

Additional ND Filters Included

A set of adjustable ND filters, ranging from OD0.3 up to OD4, are provided in the -UV, -VIS, and -NIR versions to make final intensity adjustments to the beam before it reaches the camera imager, after beam passes through the wedges. In the -BB version, all the ND filters included in the -UV, -VIS, and -NIR versions are included.  There are two slots in series to insert the ND filters on the beam sampler.  Damage threshold of these ND filters are 50 W/cm2 ( 100 mW/cm2 for -UV version), however, distortion due to thermal lensing can happen at as low as 5 W/cm2.  It is advised to use this sampler for optical power ranging from 10 mW to ~400 Watts.

The Broadband Version

One can choose to use the broadband LBP2-SAM-BB2 to handle multiple lasers with a broad range of wavelengths.  The differences between the broadband version from the others are as follows:

  • The wedges are not coated with anti-reflection coating
  • All the ND filters included in the UV, VIS, and the NIR versions are included

Best Use Recommendation

The ultimate goal of using the beam sampler and the ND filters are to keep the laser intensity level maximum but below the sensor saturation level without damaging any optical element. Since the wedges are highly reflective, they are not of concern in most cases.  Keep the laser power so that the intensitive level at below 5 W/cm2 at the first surface of the ND filters to avoid a thermal lensing effect.  Also, try to avoid using too many ND filters.  The more filters are used in the beam path, the more distortion and interference can happen.