Coherent FieldMaxII-TOP Specifikace stáhnout pdf (Strana 74)

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

Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

BeamMaster

Beam Proles and Widths

On each rotation of the drum, BeamMaster

captures and processes the data from the

passage of the seven knife edges across

the beam (three knife edges with BM-3) as

power, position and prole information. This

information can be displayed every rotation, be

strip-charted, and be sent to le or to the RS-232

port. Two orthogonal proles can be displayed

and the beam widths can be digitally displayed

for any three user-chosen clip levels. A Gaussian-

Knife-Edge Beam Proler

t prole can be overlaid on any chosen measured prole and the t and correlation

parameters can be displayed.

To obtain the maximum prole detail, the system automatically centers the prole and

zooms to display ~3 times the beam width, and the prole intensity data is autoscaled

(optional) to t the display height. Added detail can be obtained in a special high-

resolution mode. This mode is very useful for analyzing beams that are either far from

Gaussian in shape or smaller than 100 µm.

Beam Position and Ellipticity

The beam centroid position can be continuously monitored relative to the center of the

sensor area, along with the beam shape, ellipticity (major and minor axes) and angular

orientation. A zoom function is available and the user can choose the clip level and

strip-chart the position (X and Y) data to monitor short-term or long-term, time-

dependent stability or drift.

Power Measurement

The beam power can be displayed either as a digital readout or in combination with an

analog “needle.” Units can be chosen as µW, mW or dBm, and the user can offset the

zero and zoom in on any part of the power range. Attenuator (lter) les can be selected,

and a test range can be selected and displayed to monitor beam power within specic

limits, with optional audio alarms.

Data Collecting and QA Testing

Data regarding beam size, position and power can be continuously displayed in analog,

digital and strip chart forms on the computer screen. Data can also be logged to a data

le in real time for later processing or test report generation. Pass/Fail testing can be

performed on measured results for acceptance within specic tolerances. Files can be

transferred to another computer with an RS-232 link or data can be transferred in real

time. All screen images also can be captured and stored as BMP or JPG les or can be

printed to any Windows printer.

2D and 3D Intensity Plots

The projection function provides either a 2D or 3D view of

the beam intensity prole. The projection is created using

reconstructive tomography. The same method is used to

produce 3D images with X-ray systems. The more knife edges,

the greater the level of detail that can be obtained. For a beam

distribution that is signicantly non-Gaussian, such as that

from a diode laser, the standard seven-knife-edge system can

reconstruct a plot that closely matches the real beam. When

examining near-Gaussian beams, the three-knife-edge system

gives an accurate intensity distribution.

BeamMaster 2D Intensity Plot

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 91 92

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