Coherent FieldMaxII-TOP Spécifications télécharger pdf (Page 71)

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VARM, LaserCam-HR-InGaAs, C-VARM, BCUBE, C-Mount

Flanges and Barrel

In general, a camera cannot sense less than ~λ/4 total

distortion in the beam, so if a series of lters is used, they

must be made to very exacting laser-grade specications.

Attenuating optics from Coherent are manufactured to

better than a λ/10 surface specication, so at least six optics

in series can be used. Calculate the Low-Distortion Face

Plate (LDFP) and each BCUBE as one optic, and the VARM or

C-VARM as three optics each.

BCUBE, UV-BCUBE, VARM, C-VARM, UV C-VARM and all other Coherent

cameras have female C-Mount threading, making them easy to connect

with the male C-Mount connection ange provided with each attenuator.

Also, all attenuators have 1/4-20 tapped holes for independent post or plate

mounting.

The C-Mount anges (threaded rings) also have a female RMS microscope

thread. This allows a microscope objective to be coupled to the attenuators

and extension barrels in order to create a exible close-up imaging system

for analysis of small/focused beams, ber optics, laser diodes or LEDs.

Avoiding Multi-Filter Beam Distortion

The wavefront distortion through a number of optical lters can be

calculated by taking the square root of the sum of the squares of the

wavefront distortion of the individual components. For example, if the

individual optics are made to λ/10 specications and six are used, a total

λ/4 RMS wavefront distortion will be introduced to the beam:

t = Transmission Value

t = 1.00

Laser Beamline

C-Mount Thread

50 mm

(1.97 in.)

70 mm

(2.76 in.)

86 mm

(3.39 in.)

40 mm

(1.57 in.)

FIXED ATTENUATION

VARIABLE ATTENUATION

MAX

MIN

MAX

MIN

OUT

79.4 mm (3.13 in.)

63.5 mm (2.5 in.)

58.7 mm (2.3 in.)

57.1 mm

(2.25 in.)

44.5 mm

(1.75 in.)

C-Mount

Thread

OUT

40.6 mm

(1.6 in.)

61 mm (2.4 in.)

45.7 mm

(1.8 in.)

46 mm

(1.8 in.)

C-Mount

Thread

VARMC-VARM and UV C-VARM BCUBE and UV-BCUBE

Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

Attenuation Optics for Cameras

Beam Diagnostic Accessories

0.1

+ 0.1

= 0.25

Model VARM C-VARM UV C-VARM BCUBE UV-BCUBE BARREL SET

(Barrels, 3 C-Mount

Flanges)

Wavelength

Min. (nm) 380 380 190 380 190 –

Max. (nm) 2200 2200 1100 2200 2200 –

Attenuation

From 4 x 10

:1 10

:1 50:1 50:1 –

To 1:1 3000:1 300:1 10:1 10:1 –

Aperture (mm) 19 17 17 19 19 –

Max. Power Density (W/cm

) 1* 1* 1* 2.0 x 10

2.0 x 10

–

Max. Energy Density (J/cm

) 0.1* 0.1* 0.008 50 50 –

Damage Limit

(W/cm

) 5 x 10

5 x 10

– 2.5 x 10

2.5 x 10

–

(J/cm

) 10 10 0.008 50 50 –

Beam Offset (mm) – – – 4.0 4.0 –

Part Number 33-3328-000 33-3336-000 33-6859-000 1098403 1098466 1098426

Device

Specications

The maximum power and energy density listed are the levels at which thermal lensing occurs.

Attenuator Selection

Attenuation is selected on the basis of power density in

W/cm

or energy density in J/cm

. The attenuation from

the camera’s Low-Distortion Face Plate (LDFP) will allow an

average power density of up to 1.2 mW/cm

. There are then

only two more steps to attenuation selection:

1) Choose either the VARM or the C-VARM for up to 1W/cm

2) In addition or alternatively, use a BCUBE beamsplitter

module to pick off between 2% and 10% of the beam

(depending on polarization and wavelength).

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