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Apparatus for Laser Beam

Profile Analysis

Model : HO-ED-LOE-01A

The Laser beam profiler is a high precision, CCD based (for VIS / NIR) device to be used with lasers having wavelengths between 340nm and 1100 nm. Coupled with software package, the device can be used for quick and accurate characterization of lasers.

A laser beam profile is produced to identify spatial characteristics that predict the propagation, quality, and utility of a laser beam. These spatial characteristics include beam width, divergence and direction. Laser beam profiling is important for manufacturers of products that utilize lasers as the core technology.

Applications in medical and industrial fields often require laser source as tools, and these lasers must be analyzed and well understood. Products designed for laser printing, welding, cutting and fiber optics require information about the efficiency, power, special distribution and uniformity of the beam, possible only through laser beam profiling systems.

Two major electronic techniques are used to image laser beams, mechanical scanning devices and camera based systems. Mechanical scanning devices employ moving pinholes to attenuate the beam as well as to sample it, while camera-based systems image the beam that reaches the array. Mechanical scanning system assemble a beam image after making multiple passes through the beam. This limits the number of images that can be displayed and generally not considered to work in real time. Further, they are not suitable for pulsed lasers.

Experiment Examples

    To study the polarization nature of laser beam and find the polarization extinction ratio of the laser beam

Study the intensity distribution of laser in X and Y direction using the corresponding micrometer of XYZ stage. The beam is scanned linearly using the micrometer noting down the output current of the detector at close intervals. Plot the detector current Vs distance graph and can study the gaussian nature of the laser beam.

    To measure the divergence of the laser beam

The 'Beam Diameter' is defined as "The distance across the center of the beam for which the irradiance (E) equals (  1  /  e²  =  0.135  )". The 'Spot Size' (ω ) of the beam is "The radial distance (radius) from the center point of maximum irradiance to the 1  /  e² point". These definitions provide standard measures of laser beam size.

    To measure the divergence of laser beam using a lens of known focal length

Divergence angle θ is given by,

θ   =   tan-1   (   |   ω2   -   ω1   |   )

Where ω1 and ω2 are the beam spot sizes at two different positions say Z1 and Z2 respectively.

    To study the Gaussian nature of laser beam

Plot a graph with polarizer angle and the output current from the detector and can study the polarization nature of the laser beam.

    To measure the diameter (beam spot size) of the laser beam

Plot a graph with polarizer angle and the output current from the detector and can study the polarization nature of the laser beam.


    Laser beam and wavefront profiling

    Beam propagation analysis

    Beam shaping and beam monitoring

Camera-based systems image the beam at the frame rate of the camera. The images produced enable the user to view short-term transient effects of the laser. This experiment setup concentrate on camera based systems as it is generally acknowledged that they can yield more detailed, real-time profile information.

Fig. Intensity measurement as function of pixel. The software developed for laser beam profiler (LBP) can generate line and average plot of ntensities from the image.

Holmarc Laser Beam Profiler (LBP) enables quick and accurate measurement of laser beams as well as other spot light sources. There are two models, one for educational application (Model : HO-ED-LOE-01A) which is based on CMOS sensor and the other is intended for scientific application based on CCD camera Model : HO-ED-LOE-01B. Both these laser beam profiler models include HOLMARC IMAGE Analysis Software.

Related Topics

    Polarization nature of laser beam

    Extinction ratio of the laser beam

    Gaussian nature of laser beam

    Beam spot size

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