Coherent FieldMaxII-TOP Specifikace stáhnout pdf (Strana 76)

Superior Reliability & Performance • www.Coherent.com • LMC.sales@coherent.com

Features

• Measurement and display of CW laser divergence,

(or k) and astigmatism

• Beam sizes 0.2 mm to 25 mm

• Wavelengths from 220 nm to 15 μm

• Determination of waist location and diameters

(including D4σ diameter) and Rayleigh range

• Angular and translational beam-pointing stability

Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

Beam Propagation Analyzer

ModeMaster PC

The ModeMaster PC head is a dual-knife-edge beam proler

integrated with a diffraction-limited precision scanning lens,

which is translated along the beam propagation axis. The

lens focuses the beam to create an internal beam waist, and

the two orthogonal knife edges (X and Y), which are mounted

on a rotating drum, measure the beam diameter and beam

axis location at 256 planes along the beam waist as the

lens is translated. The powerful ModeMaster PC software

then derives the M

factor, the size and location of the beam

waist, the far-eld divergence angle, the pointing direction,

astigmatism and asymmetry, and the Rayleigh range.

Knife-

Edges

Pinholes

Sensor

Rotating

Drum

Servo-

Driven

Lens

• Beam Quality – M

• Beam Diameter

• Waist Diameter & Location

• Divergence Angle

• Rayleigh Range

• Pointing Stability

• Power Density

• Beam Proles

• Second-Moment Diameters

• Astigmatism

• Waist Asymmetry

• Divergence Asymmetry

Beam propagation is concerned with the energy distribution

in a beam and the change of that distribution along the

beam path. The ModeMaster Beam Propagation Analyzer

established a new laser beam quality parameter, M

, which

has now become an ISO measurement standard. M

describes

how close to “perfect-Gaussian” a laser beam is, and can be

used to predict the beam size, beam shape and the smallest

spot that can be created from the beam further downrange.

Measurements also include ISO D4σ, second moment,

knife-edge, slit and D86 beam diameters. The entire

measuring process occurs in less than 30 seconds.

The ModeMaster PC also provides special weighting

functions to help eliminate effects on measurement

accuracy due to intermittent beam noise, vignetting or other

transients during the focus scan. Real-time displays allow

laser peaking or adjustment for minimum M

, divergence,

maximum power density, far-eld pinhole proles and

pointing angle.

How Does the ModeMaster PC Work?

Complete Geometric Beam Characterization Along the Laser Beam Path

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