Coherent FieldMaxII-TOP Specifikace stáhnout pdf (Strana 41)

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Coherent EnergyMax sensors enable laser pulse energy measurement

over a broad range of wavelengths, repetition rates, pulse energies and

beam diameters. With their unique combination of superior performance

and user-friendly convenience, EnergyMax sensors are your best choice

no matter what your particular laser energy measurement need.

EnergyMax sensors are highly linear in terms of repetition rate, laser

pulse width, and measured energy. They are also accurate across a broad

range of wavelengths due to onboard wavelength compensation. In

addition, automatic temperature compensation accounts for changes in

ambient temperature, as well as for heat generated by absorption of the

laser energy. Temperature compensation also enables the use of user-

installable heat sinks for even higher average power handling capabilities.

Coherent EnergyMax sensors are the most linear and accurate on the

market.

Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

Introduction and Selection Charts

EnergyMax - Laser Energy Sensors

Features

• Superior damage resistance

• High repetition rate operation

• Large dynamic range gives each sensor broad coverage

• Low noise and excellent linearity for greater accuracy

• Large active area

Unlike all other thermal detectors, pyroelectrics measure

the rate of change of the detector temperature, rather

than the temperature value itself. As a result, the response

speed of the pyroelectric is usually limited by its electrical

circuit design and the thermal resistance of the absorptive

coating. In contrast, other thermal detectors (such as

thermopiles and bolometers) are limited by slower

thermal response speeds, typically on the order of seconds.

Pyroelectrics respond only to changing radiation that is

chopped, pulsed, or otherwise modulated, so they ignore

steady background radiation that is not changing with

time. Their combination of wide uniform spectral response,

sensitivity, and high speed makes pyroelectrics ideal choices

for a vast number of electro-optic applications.

The EnergyMax sensor line uses a pyroelectric element to

measure the energy in a laser pulse. It does this by producing

a large electrical charge for a small change in temperature.

The active sensor circuit takes the current from the sensor

element and converts it to a voltage that the instrument can

measure. The gure below shows the relationship between

the current response of the pyroelectric element and the

output voltage of the sensor circuit. The relationship between

the current response and the output voltage response is

xed so that the calibrated peak voltage of the output is the

integrated energy of the laser pulse.

Fundamental Principles

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