LBS-300 Attenuator
LBS-300 Attenuator

LBS-300s Attenuator

Combination Neutral Density Filters and Dual Beam Sampling Optic System

The LBS-300s beam splitter attachment for C-mount, CS-mount, or Ophir mount cameras allow you to measure laser beams with diameters up to 15mm and powers ranging from 10mW to ~400W(1). The 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. Approximately 99% of the beam is transmitted through the beam sampler with 0.01% passed on to the camera. A set of adjustable ND filters are provided to make final intensity adjustments to the beam before it reaches the camera imager. If additional attenuation is needed, an external wedge may be mounted at the input port, however this 3rd wedge will cause polarization selectivity when the beam is significantly polarized different in the S and P planes. A 1.035-40 thread is provided behind each wedge along the axis of the output beam that can be used to directly mount accessories with 1” lens tubes such as beam dumps or even power and energy sensors to the LBS-300s.

(1)For Gaussian beam diameter <1/2 the clear aperture and depending on ND filter and camera saturation limits the maximum power may be as high as 1000W.


  • C-mount
  • LBS-300s-UV: 266 - 355nm, LBS-300s-VIS: 400-950nm, LBS-300s-NIR: 950-1800nm , LBS-300s-BB: 190 - 1550nm
  • LBS-300s-UV: A/R ≤1% , LBS-300s-VIS: A/R ≤1%, LBS-300s-NIR: A/R ≤1%, LBS-300s-BB: Uncoated
  • UVFS
  • 17.5mm
Need help finding the right beam profiler? Try our Beam Profiler Finder


The LBS-300 combination beam sampling and beam apsorption systems available with the following options.
  • LBS-300s-UV


    Compact laser beam sampling system; wavelength 266-355nm

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  • LBS-300s-VIS


    Compact laser beam sampling system; wavelength 400-700nm

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  • LBS-300s-NIR


    Compact laser beam sampling system; wavelength 1064nm

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  • LBS-300s-BB


    Compact laser beam sampling system; wavelength 190-1550nm

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Can I use LBS both for beam profiling and power measurement?

Yes, the main function of LBS-300s beam splitter is Beam profiling, however it performs a 3-way beam splitting:
Less than 0.01% (1/103) of the beam is reflected in one direction about 1% in another while remaining 99% of incident laser beam is transmitted.
This allows user to measure one of the 3 beams, depends on available power measurement equipment and setup convenience.

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Which equipment can be connected to LBS-300s threads?

LBS-300s is equipped with 2 C-Mount threads and 2 CS-Mount threads.

An Input C-Mounts thread is designated to connect optional Wedge Splitter (SP90273)  to reduce power density or beam extending negative Lenses (SP90187/88/90) to locate the focal spot in required position.

An Output C-Mounts thread mostly used to connect Ophir's Beam profiling camera. Extension tube between LBS-300s and camera, can also be used to reduce noise on the camera and power density on LBS-300s adjustable ND filters.

 A 1St and 2nd Beam Out, equipped with CS-Mount A 1.035-40 enables connecting Ophir Power meters such as PD300R family (7Z02436/7/8/9) or one of the Beam Deflectors


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What should be my Safety concerns while using LBS-300s

Regular laser safety precautions should apply. Please note, that the main incident beam will exit the LBS-300s refracted approximately 6°. Provision must be made to safely contain the transmitted beam by beam dump or power meter.

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How to deal with removable Beam Blocker?

The beam blocker is designated to keep one wedge surface protected during handling and shipping. It can be left attached for low power laser operations. However, in the case of high-power laser irradiation scattered light might interfere with beam profile measurement and cause offset. In case of such offset, we recommend removing the beam blocker.

After removal, an additional laser output, having less than 0.1% of incident beam power will be reflected. That beam could be used for simultaneous measurement of laser power via Ophir Power Meter in addition to beam profiler.

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Tutorials and Articles

Imaging UV light with CCD Cameras

Is it possible to image a UV laser with a Silicon Sensor CCD camera offered by Ophir-Spiricon? The answer is yes, but the direct UV light ablates Silicon CCD chips over time. The ablation is cumulative and depends on the intensity, the wavelength, and the duration of the light on the sensor. The best choice for imaging UV light without damage is to avoid directly imaging the beam on the CCD sensor by using an UV image converter... Read more...

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The Concept: Ophir customers often need to connect different optical components together to create an optimal setup to best meet their needs. In order to do this, Ophir provides mutual interconnections between different Ophir products via adapters with various threads, designed to exactly fit required optical path distances for each device. This is an integrated solution, prealigned and ready to use. Read more...


Customers that purchase the above items also consider the following items:
  • Large C-mount Wedge Splitter


    For additional attenuation add this to the front end of the LBS-300. Good for 350-2000nm

  • Beam Deflector Assembly


    for 350-1200 nm only

  • Beam Deflector Assembly


    For 266 nm, high damage threshold

  • Beam Deflector Assembly


    For 355 nm, high damage threshold

  • Beam Deflector Assembly


    For 532 nm, high damage threshold

  • Beam Deflector Assembly


    For 1064 nm, high damage threshold

  • FSA-50Y


    50 lens that lengthens the path of the focused beam and magnifies the spot

  • FSA-100Y


    100 lens that lengthens the path of the focused beam and magnifies the spot

  • FSA-200Y


    200 lens that lengthens the path of the focused beam and magnifies the spot