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Laser Diode Drivers

The 4500 series of laser diode drivers offers an unprecedented combination of safety,

performance, and value. Low noise, stable operation makes these flexible instruments ideal for

even the most demanding applications. Any combination of LFI modules (both laser diode

drivers and temperature controllers) can be interconnected to provide a complete laser diode

control solution.

Extensive protection features are incorporated into the 4500 series to protect your laser diode

from damage. The output control circuitry includes a shorting relay which protects the laser

diode when the output is off or the unit is powered down. The slow start circuit waits three

seconds and then safely ramps the output to the preset operating level. To prevent thermal

damage to your laser diode, the LFI-4500 series output can be disabled by the LFI-3500

temperature controller via the analog interface input. A unique AC power monitor circuit disables

the output if AC power is above or below the recommended input level.

Simple to use front panel controls make the 4500 series easy to operate. Highly visible LEDs

indicate errors that effect the output, on/off status, and current limit condition. Control the laser

diode forward current or monitor photodiode current using the linear ten-turn potentiometer. The

current limit setting is fully independent and is set using a twelve-turn trimpot on the front panel.

Interlock any combination of LFI-4500 series laser diode drivers or LFI-3500 series

temperature controllers without additional hardware. Two or more modules mount into a 19" rack

with optional rack mount kits

KEY FEATURES ...

• Low noise, stable current source (<20 ppm)

• Constant Current and Constant Power control modes

• Five models deliver from below 200mA to 6.5 Amps

• Works with all LD/PD configurations

• Easy to adjust, fully independent current limit

• Slow turn-on and comprehensive laser protection circuitry

• Operates on standard AC voltages

... the WAVELENGTH Advantage

Low cost, flexible instrument

Easy setup- Intuitive front and rear panels

Display laser diode current and voltage, limit current, photodiode current

Select photodiode range & modulation range for greatest sensitivity

Four Selectable output filters allow maximum performance in CW or modulated mode

Interface to the LFI 3500 Temperature Controller to protect laser diode from thermal runaway

conditions

Comprehensive Analog Interface includes:

Buffered monitors: LD current & voltage, PD current, and LIMIT current

Remote output ON/OFF control

External control of operating current

"Open Drain" ON/OFF and error status outputs

Laser safety interlock

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Wavelength Electronics LFI-3500 Series Guía de usuario Pagina 4