Features

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

Non-Gaussian Beam Profiles

Examples of experimentally measured beam profiles showing a near-Gaussian beam shape (left), a flat-top beam (middle), and a highly-modulated multi-mode beam (right).

While many laser systems operate with near-Gaussian beams, other laser systems possess non-Gaussian beams that propagate differently and exhibit significantly different spatial distributions (see above figure for examples). In some cases, a laser resonator emits a beam with a higher-order TEMmn mode. Depending on the resonator geometry, these modes can be cylindrical in nature and are called Laguerre-Gaussian beams or rectangular and are called Hermite-Gaussian beams. In other cases, a laser beam is modified by an optical system to such an extent that its profile and propagation can no longer be approximated using the Gaussian beam analysis. Flat-top beams are one such example where a beam exhibits a nearly constant irradiance over its beam width. Given the steep edges of the beam profile, the diameters of these beams are often characterized by their full-width at half-maximum (FWHM) values as opposed to the HW1/e2 radius values used for Gaussian beams. Such flat-top beams are important for laser-based material processing where a constant irradiance provides more uniform material modification. The propagation of these beams can be quite complicated and is often encountered when a laser beam overfills a focusing objective in order to generate a very small spot size in high-resolution microscopy.

Right High Quality Camera for Various Applications

The new LBP2 series laser beam profilers are available with a visible (190 - 1100 nm) CCD or a phosphor coated (1440 - 1605 nm) CCD camera. Both the cameras feature high resolution 1624 x 1224 array.  In order to minimize interference and provide the most accurate laser beam profile, the protective window is removed and the cameras are shipped with an ND filter and a protective cap premounted on them.

3D beam profile for an intuitive understanding of the intensity distribution

Stackable Attenuators for High Power Input

Each laser beam profiler comes with stackable neutral density filters (one ND1 and two ND2 filters) with a 19 mm clear aperture, 1 inch-32UN (C-Mount).  They are used to protect the camera by attenuating the beam and to help the camera measure the beam size accurately by keeping the intensity level below saturation.  The damage threshold for these ND filters is 50 W/cm2, however, distortion due to thermal lensing can happen at as low as 5 W/cm2.  These filters are also separately available for purchase as LBP2-ND1 (red metal housing), LBP2-ND2 (black), and LBP2-ND3 (green). 

LBP2 series comes with one ND1 and two ND2 stackable attenuators.

Easy Software and Camera Installation

The LBP2 software and camera installation is simple and easy. See the video for step-by-step instructions.

Extensive Software Features

The LBP2 software interface offers a broad range of functions and ISO approved quantitative results with an ease-of-use software user interface. The patented UltraCal algorithm, guarantees the data baseline or "zero-reference point" is accurate to 1/10 of a digital count on a pixel-by-pixel basis. ISO 11146 requires that a baseline correction algorithm be used to improve the accuracy of beam width measurements.

UV Beam Imager

The new LBP2-UVIMG is ideal for users who need to look at the profiles of 193 to 360 nm beams. There is a fluorescent plate that converts UV radiation that is poorly imaged by silicon camera into visible light. Then it is imaged onto the CCD. This converter has a high light output, wide linear dynamic range and high damage threshold. Resolution is 35 X 35 um, and the dimensions are Ø31 X 120 mm.

UV Beam Splitter

The new LBP2-UVBS is the UV beam splitter that can be mounted onto the input aperture of the LBP2-UVIMG, to allow imaging higher power/energy beams onto the CCD camera. While the saturation intensity of LBP2-UVIMG is ~ 15 mJ/cm2 and ~20 mJ/cm2 at 248 nm with the filters included in the LBP2 beam profilers, 20 times stronger beam can be imaged once the LBP2-UVBS is mounted on the imager.

Phosphor Coating Optimized for 1440 - 1605 nm

The Phosphor coating technology allows you to view NIR (1440 - 1605 nm) lasers and light sources to measure with LBP2-IR and LBP2-HR-IR . The anti-Stokes phosphor coating produces visible photons at a rate roughly the square of the input signal. This non-linearity or Gamma is corrected in the software's Gamma Correction function. Thus an accurate, linear image of the beam profile is obtained permitting standard, cost effective analysis of NIR beams. Note that the measured laser spot size will be slightly larger than the actual size, due to the use of phosphorescence.

Recertification

Unlike an optical power meter or a detector, a laser beam profiler does not have any recalibration process, as there is no traceable standard.  However, to help you maintain camera performance, we recommend that customers return their camera on a regular basis (every 12 months is recommended under normal use) for a verification and recertification process. This process will correct bad pixels when possible, clean the imager, and certify that your camera is still performing to factory specifications. Or you will be advised of any changes that may be serious enough to require limiting use, repair or replacement.  Please contact Newport calibration facility for inquiry and service.

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