Coherent FieldMaxII-TOP Spécifications télécharger pdf (Page 79)

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The closer an actual laser beam is to diffraction-limited, the

more tightly it can be focused, the greater its depth of eld,

and the smaller the diameter of the beam optics can be

to transmit the beam. M

is the ratio of the divergence of

the actual beam to that of a theoretical diffraction-limited

beam of the same waist size in the TEM

mode. Thus, the

angular size of the beam in the far eld will be M

larger than

calculated for a perfect Gaussian beam.

Normalizing

Gaussian

Beam

Real

Beam

θ Θ

Θ = M

x 2λ / (πWo), for a beam waist diameter 2Wo.

Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

Laser Beam Quality

ModeMaster PC

108 mm

(4.25 in.)

86 mm

(3.4 in.)

310 mm (12.2 in.)

360 mm

(14.2 in.)

65 mm

235 mm

(2.56 in.

9.25 in.)

305 mm (12.0 in.) UV VIS NIR

358 mm (14.1 in.) IR High-Divergence

409 mm (16.1 in.) IR Low-Divergence

Scan Head and Precision Mount Control/Interface Console

Model ModeMaster PC

Accuracies

Waist Diameter (%) ±2

Waist Location ±8% of input beam Rayleigh Range

Beam Quality – M

(%) ±5

Divergence (%) ±5

Beam Translation ±5% of waist diameter +0.1 mm

Pointing Angle ±5% of divergence +0.04 mrad

Azimuth Angle Readout ±2°(10 to 200°)

Knife-Edge Clip Levels User-adjustable 0% to 100% in 1.5% steps

ModeMaster PC Control/Interface <8 Hz (M

, divergence, power density, waist diameter, proles)

Module Update Rate

Analog Outputs Detector signal output, 0 to 13V maximum

A/D control signal out, 0 to 5V pulse

Trigger (syncs to drum rotation), 0 to 5V pulse

Digital Outputs RS-232 interface. Front and back knife-edge widths and pinhole proles

available in digitized form via RS-232

Power 100 to 240 VAC, 47 to 63 Hz, 40W maximum

Device

Specications

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