Coherent FieldMaxII-TOP Dokumentacja Pobierz pdf (Strona 59)

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Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

Introduction to Camera-Based Beam Diagnostics

LaserCam-HR

Coherent BeamView Analyzer systems are the recognized leader in soft-

ware, hardware and optical components for laser beam analysis. Constant

product improvement based on customer feedback, and innovation from

beam analysis experts, have made BeamView Analyzer products the rst

choice for laboratory, factory and eld measurements.

The key elements of a typical camera-based beam proling system are the

camera itself, Coherent Beamview analysis software running on an appropri-

ate computer and, when necessary, beam attenuation optics. The key choice

to make is matching the appropriate camera technology to your application.

Coherent beam diagnostic cameras are specically designed or modied

for laser analysis. They provide low noise, maximum linearity, and uniformi-

ty of response—needed for maximum measurement accuracy. All of these

diagnostic cameras accept C-Mount optical accessories and are delivered

without a cover (glass/plastic window) over the sensor array. Instead, a

LDFP (Low-Distortion Face Plate) lter is supplied with each camera—a

laser-grade neutral density lter made of glass specied and polished

specically for laser diagnostic analysis. The LDFP lter is mounted in a

standard C-Mount ring and provides attenuation of ambient room light so

that the camera can be used with normal room lights.

Coherent offers three families of cameras. Lasercam II and LaserCam IIID

cameras use analog and digital interfacing respectively. The latest edition,

LaserCam HR, is based on USB technology.

USB 2.0 Beam Diagnostic Camera Family

Coherent pioneered the ease-of-use of digital USB 2.0 bus-powered, high-

resolution, large-area cameras requiring only a single cable for both video

transfer and camera power. The LaserCam-HR family of beam diagnostic

cameras now includes the LaserCam-HR-UV and the LaserCam-HR-InGaAs

models, extending the measurement spectrum from the deep ultraviolet

to the near-infrared wavelengths.

The same features, performance and convenience previously available only

for wavelengths covered by the LaserCam-HR are now available to users of

excimer lasers, telecommunication sources and military laser systems. With

a broad spectral range covering 190 nm to 1700 nm, there is a LaserCam-HR

camera proler system ideally suited for nearly any demanding laser mea-

surement application.

Important Considerations

• Ease-of-use connectivity

• High-speed USB 2.0 Interface

• USB bus-powered low voltage operation

• Broad spectral range

• LaserCam-HR 300 nm to 1100 nm

(400 to 1100 nm with LDFP)

• LaserCam-HR-UV DUV to 355 nm

• LaserCam-InGaAs 900 nm to 1700 nm

• Large dynamic range

• Coherent Adaptive Pixel Technology (CAPT)

• Digital output through USB 2.0 eliminates the need for

an interface card (frame-grabber)

• High-accuracy beam diameter calculations

• Excellent beam spatial uniformity

• BeamView 4.4 application software

• Variable camera exposure time

• Compact size

• High-speed image capture rates

(15 to 25 frames per second)

• Pass/Fail TTL level output

• RS-232 and TCP/IP communication protocols

• Comprehensive LabVIEW library suite for the

majority of BeamView-USB software functions

• All LaserCam-HR camera systems are RoHS

compliant

Coherent Adaptive Pixel Technology

Coherent tests each LaserCam-HR camera

through a process called CAPT (Coherent Adap-

tive Pixel Technology). This uses a calibrated

lightsource and a digital look-up table to give

pixel-to-pixel linearity correction. In addition, any

identied “hot” pixel is corrected by averaging

the value of the four directly surrounding pixel

intensities. Finally, the noise levels are carefully

monitored through both a background noise

subtraction and a user-selectable bias noise

offset level. The CAPT process optimizes the

performance of the camera array, directly

improving beam measurement accuracy,

especially with beam diameter calculations.

Multiple channel camera support of different

LaserCam-HR camera models is available for all

three LaserCam-HR camera types (UV, visible,

and InGaAs).

Variable camera exposure time available with

the entire LaserCam-HR camera family allows

imaging of higher repetition rate sources and

lets the user decrease/increase the signal inten-

sity levels using exposure time instead of exter-

nal attenuation. This feature is especially suited

for the LaserCam-HR-InGaAs, with its impressive

spatial uniformity characteristics.

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