The LBS-300HP-NIR is a patent pending technology beam splitter for High Power lasers that allows measuring NIR (~1064nm) focused or collimated laser beam profiles up to 5kW or 15MW/cm².
The LBS-300HP-NIR operates by reflecting a fraction of the incoming beam through the front surface of each of a pair of orthogonally oriented wedges. Less than 0.0001% (1/10 ⁶) of the beam is reflected towards the Ophir Beam Profiler Camera. This enables beam shape, focal spot, beam waist, M² of a high-power laser; up to 5kW or 15MW/cm².
Relative power can be measured by placing an Ophir power sensor after the first wedge, thereby measuring the laser beam after being reduced to 0.1% (1/10³).
99.9% of the laser beam passes through, ideal for absolute power measurement.
Each optical path through the LBS-300HP-NIR provides uniform attenuation of any beam shape (Gaussian, flat-top, doughnut, etc.) while preserving the polarization and overall profile of the incoming laser beam thus providing accurate sample of incident beam. A 1.035-40 thread is provided behind each wedge along the axis of the output beam. These can be used to directly mount accessories with 1” lens tubes such as beam dumps or power/energy sensors.
Compact laser beam sampling system; wavelength ~1064 nmRequest a Quote
Is LBS-300HP-NIR suitable for my laser?
What is the difference between LBS-300HP-NIR and other beam splitters?
The LBS-300HP-NIR uses specially treated material that provides extremely low reflection and high laser damage threshold, enabling beam attenuation by around a million times while keeping all beam parameters. This extreme attenuation enables measuring High Power laser beam profile focused on a beam profiler CCD.Close
What is the laser power attenuation of LBS-300HP-NIR?
A specification defines beam attenuation of a million, meaning less than 0.0001% (1/10⁶) of the beam is reflected towards beam profiler or power meter, however, this parameter can vary from unit to unit. In the majority of units the reflection even less than 0.0001%. The median reflection is 0.000075% and can vary by +/-20% (relative). The exact reflection from each surface is measured during the final production QC and documented in COC supplied with the unit. You can also verify the real reflection of your unit with Ophir support teamClose
Can I use LBS both for beam profiling and power measuring?
Yes, the main function of LBS-300HP-NIR beam splitter is Beam profiling, however it performs a 3-way beam splitting:
Less than 0.0001% (1/10⁶) of the beam is reflected in one direction and less than 0.1 % in another while remaining 99.9% 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.Close
What are environmental conditions for LBS-300HP-NIR operation and storage?
We recommend operating and storing the LBS-300HP in dust-free conditions, like a regular office or laboratory environment.
Dust and other volatile particles on the wedge surface might cause reflection change and influence the measured beam profile.
Harsh industrial environment operations will require a chamber for isolation.
How to prevent LBS-300HP wedge surface contamination?
Any contact with UVFS wedges installed in the LBS-300HP assembly can cause damage and reflection change resulting in beam profile distortion. Thus, it's recommended to avoid even the slightest contact with glass surface with neither hand , paper or cloth.
Operating and storing of LBS-300HP at conditions free of volatile particles, like a regular office or laboratory environment. Harsh industrial environment operations will require isolation.Close
How to clean the wedges?
In case of surface contamination, we recommend contactless cleaning of wedge surface by rinsing it with a chemically pure solvent such as Ethanol, Methanol or IPA (Isopropyl Alcohol), followed by prolonged gentle nitrogen or pure compressed air purging.
Please ensure solvent and gas purity and lack of moisture in order not to contaminate the wedge surface.
If contamination is not removed after cleaning, please consider whether it interferes your laser beam. The spot might be peripheral and not in CA of the laser.
In case the spot is in the laser CA, please contact Ophir support for replacement.Close
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.Close
How to direct laser exactly to the middle of LBS-300HP aperture?
How to use LBS-300HP with Beam Dump
Should I use C-mount extension tube between LBS and beam profiling camera?
Due to such significant attenuation, some light scattered from wedges might interfere correct beam profile measurement and cause offset. Thus, in case the setup allows it we recommend distancing the CCD from wedges by 50, 75 or 100mm C-mount extension tube between LBS-300HP and beam profiler.Close
For how long can I use LBS?
Generally, continues usage of LBS-300HP is limited only by temperature increase, thus in case the temperature is mild, there is no limitation.
According to tests, after 10 minutes at 2kW lasing the temperature is increased by 16 Cº and after 4kW lasing increased by 23.4 Cº.
It's not recommended to overheat the LBS-300HP assembly in order not to cause thermal lensing effect of ND filters.Close
What should be my Safety concerns while using LBS-300HP?
The LBS-300HP-NIR beam splitter allows camera-based beam profiling for high power lasers.
Learn more in the following video or see our recent article ‘Overcoming the Challenges of Measuring High Power NIR Lasers’.
Analyzing Small, High Power Beams at Focus in Manufacturing Applications
Imaging UV light with CCD Cameras
White Paper – Keeping Your Additive Manufacturing Laser in Spec
Laser Measurements in Materials Processing: How and When They Absolutely, Positively Must Be Made
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