Coherent FieldMaxII-TOP Spezifikationen PDF herunterladen (Seite 70)

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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

Beam Diagnostic Accessories

Features

• Laser-grade attenuation optics

• Compatible with all Coherent beam diagnostic cameras

• Virtually undistorted and interference-free attenuation

• Variable and xed attenuation for beams up to

2000W/cm

or 50J/cm

• C-Mount threads couple directly to cameras

Attenuation Optics & Accessories

Most cameras are too sensitive for direct viewing of

laser beams. For example, a typical diagnostics camera

saturates at only ~0.5 µW/cm

power density (at ~633 nm)

or at ~9 nJ/cm

(at 1064 nm) pulsed energy density. If the

camera has an electronic shutter, it can be used for some

CW beam attenuation, but there is more exibility in using

optical attenuation. Any attenuation optics introduced in the

beam path must be manufactured to exacting specications.

The optics must be laser-grade substrate, and use the proper

atness and wedge to avoid etaloning and fringing, so

that the beam is not distorted by the introduction of the

attenuation. We offer attenuation optics that are designed to

these specications and packaged for use with our cameras.

Typical attenuations are 1:1 to 400,000:1, but even larger

attenuations are possible. All Coherent diagnostic cameras

accept C-Mount optics and accessories, and are delivered

without a standard window in front of the sensor array. Such

windows are liable to distort the optical beam. However, a

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

camera purchased from Coherent. The LDFP is a laser-grade

optic specied and polished for diagnostics use. It is mounted

in a housing with C-Mount threads and provides attenuation

of room light so that the camera can be used with the lights

on. For operation below 400 nm, the LDFP must be removed.

The Continuously Variable Attenuator Modules (C-VARM

and UV C-VARM) contain two wedge attenuators that are

continuously variable and a step attenuator that allows

attenuation from 10

:1 down to 3000:1. The C-VARM and

UV C-VARM can be nely adjusted to achieve both precise

attenuation levels and maximum use of the camera’s optical

dynamic range.

The Variable Attenuator Module (VARM) is a triple-wheel

lter holder that contains three lters per wheel. The lters

are made to our exacting specications for transmission

value and material quality. The VARM is adjustable in

attenuation in 64 discrete steps of approximately 16%

reduction each time from 400,000:1 down to 1:1. The VARM

can be easily returned to exactly the same attenuation level

as previously used.

The BeamCUBE™ Fixed-Attenuator Modules (BCUBE and

UV-BCUBE) provide xed attenuation and beam pickoff for

performing diagnostics on high-power laser sources. The

BCUBE and UV-BCUBE utilize the front surface reection

from an uncoated laser mirror to achieve beam samples at

2% to 10% of the incident radiation, depending upon beam

polarization. Multiple BCUBEs can be coupled together for

even higher xed attenuation levels.

Laser-Grade Attenuation Optics for Cameras

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