Coherent FieldMaxII-TOP Uživatelský manuál stáhnout pdf (Strana 69)

Special Topics

Pulsed

Thermopile

Joules Mode

(for long-pulsed lasers only) When a thermopile sensor

is attached, the meter has the capability of measuring

energy from a finite duration laser pulse, or from a series

of finite duration laser pulses. (Thermopile sensors are

typically used to measure laser power and have an

extremely slow response time relative to the pulse width

of the laser used to generate the power signal.)

The power curve (refer to Figure 17) is integrated from

the pulse start to infinity. The final energy value is algo-

rithmically calculated shortly after peak power is

attained.

There is no energy range in long-pulse Joules mode. The

level of precision is based upon the range set in Power

mode prior to entering Joules mode.

Figure 17. Measuring Energy - Pulsed Thermopile Joules Mode

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Coherent FieldMaxII-TOP Uživatelský manuál Strana 69