Introduction; Description - DEI PCX-7420 B Operation Manual

Pulsed current source

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Introduction

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The PCX-7420 B is a pulsed current source designed to drive laser diodes, bars,

and arrays. It delivers current pulses from 3 A to 21.5 A with up to 250 W of total

output power. An internal trigger source provides pulse repetition frequencies from

40 Hz to 100 kHz. The external trigger function allows operation at frequencies

from single-shot to 1 MHz.

The bias current amplitude, main output current amplitude, bias pulse width, main

pulse width, trigger source, and trigger frequency are adjustable from the front

panel OLED screen or by computer control via RS-232 or USB interface.

The bias feature allows the PCX-7420 B to deliver a current pulse in two steps.

The first step—the bias pulse—starts before the intended trigger time. Current is

set just below the lasing point, minimizing the diode's response time to the main

pulse. The bias pulse current is adjustable from 0 A to 5.8 A and the pulse width

is adjustable from 0 ms to 25 ms.

The main pulse current adds to the bias current and energizes the diode at the

intended time. The main pulse current is adjustable from 3 A to 15.7 A and the

pulse width is adjustable from 50 ns to 5 ms.

Note: The total current output pulse is always the sum of the bias pulse current

and the main pulse current, even if the bias pulse width is set to zero. Consider

both the bias output current and the main output current when planning the total

output current.

The PCX-7420 B can be triggered internally or externally. The input termination

impedance for both the external gate and the external bias gate is selectable for

either 50 Ω or 10000 Ω. The Sync output signal on the front panel allows the PCX-

7420 B to be synchronized with other devices. The Sync signal logic levels are 0

V and +5 V, and its rising edge corresponds to the rising edge of the main output

current pulse. The delay between the Sync output signal and the main output

current pulse is 5 ns to 15 ns.

For more information: 970.493.1901 or

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