Replacement Products for LBP2 Series Beam Profilers and Samplers

Part Number Description Replacement
LBP2-HR-VIS3 Beam Profiler, 190-1100 nm SP90608
LBP2-HR-IR3 Beam Profiler, 1440-1605 nm SP90563
LBP2-SAM-BB2 Beam Sampler, 190-1550 nm SP90467
LBP2-SAM-UV2 Beam Sampler, 266-355 nm SP90464
LBP2-SAM-VIS2 Beam Sampler, 400-700 nm SP90465
LBP2-SAM-NIR2 Beam Sampler, 1064 nm SP90466
LBP2-ND1 ND1 Attenuator SPZ08234
LBP2-ND2 ND2 Attenuator SPZ08235
LBP2-ND3 ND3 Attenuator SPZ08253
LBP2-UVBS UV Beam Splitter SPZ17015
LBP2-UVIMG 1X UV Image Converter SPZ17023

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.