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120 Amp (CW) Laser Diode Driver; Enhanced Protection Features Designed Specifically for High Power Laser Bars & Arrays

  • high-power-laser-diode-driver-features-and-front-panel-6-6-5
  • Coherent DILAS laser diode driver rear panel
  • front-panel-close-up-laser-diode-controller-nov-2021-6
  • 500W Laser Diode Driver Pinout
  • 100A Laser Diode Bar Driver Connections
  • Coherent and DILAS laser diode bar driver current source

sku / item#: LDI-581
ships: Request a Quote for Current Ship Date

Key Features
  • 120 Amp Current Source Optimized
    for Laser Diode Bars and Arrays
  • CW Output, and Integrated QCW Pulse Generator
    and Remote Trigger Input
  • User Configurable Soft-Start Current Ramp
    and Enhanced High Power Bar Protection Features
  • RS232 Interface with LabVIEW Drivers; Optional USB Interface available

Price and Delivery Quote

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Select Cables and Accessories for this Controller

This cable is also available terminated on the
controller end with a 15-pin d-sub connector (male) and
15-pin d-sub connector (female) on the device-end (kab-231).

This cable is also available terminated on the
controller end with a 15-pin d-sub connector and
unterminated on the device-end (kab-39).

Technical Questions for this Product


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Why do Scientists & Engineers Choose Laser Lab Source?

PRICE $4450.00
  • Output Current Range: 0.00 - 120.00 Amps
  • Compliance Voltage Range: 0.00 - 5.00 Volts
  • Current Noise & Ripple (rms): < ± 0.5% of Full Scale Current
  • Current Setpoint Resolution: 30 mA
  • Current Setpoint Accuracy: ± 0.5%
  • Current Stability (4 hours): ≤ 300 ppm
  • Current Limit Setpoint Accuracy: ± 2%
  • Photodiode Current Measurement Accuracy: ± 0.5%
  • Photodiode Current Measurement Range: 0.00 - 700 μA
  • Soft-Start Current Ramp Factory Default Set to 300 Milliseconds; User Adjustable
  • User-Programmable Current Limit
  • Open Circuit Detection
  • Short Circuit when Laser Diode Current Turned OFF
  • ESD and Power Surge Clamp, AC Line Filter
  • Reverse Voltage Transient Clamp
  • Rear Panel Keylock Switch and Safety Interlock
  • Front Panel e-Stop Button Emergency Shut-Down
QCW (QUASI-CW) MODE and modulation
  • Pulse Width Range < 25 μs to CW, 10%-90% (< 20 μs on request)
  • Integrated Function Generator
  • Pulse Time Base Accuracy: ± 1.0%
  • QCW Mode Trigger: Internal (Integrated) Function Generator or External Trigger
  • Modulation Input: BNC, Digital (TTL) or Analog, 10kΩ Impedance
  • ---------------------------------------------------------------------------------------------
  • Modulation Input Voltage Range: 0 ~ 4 Volts (4V = Max Current)
  • Analog Modulation Bandwidth: 1 Hz – 20 kHz
auxiliary functions and connections
  • Laser On/Off Status Indication (TTL; On = High), vs. Gnd
  • Pilot Laser Output, vs. Gnd
  • Photodiode Cathode, vs. Gnd
  • External Cooling Fan Output (1 - 24 V, 800 mA), vs. Gnd
  • External Temperature Sensor Input (NTC 10kΩ, vs. GND)
User INTERFACE and Connectors
  • Front Panel: Alphanumeric LCD with Key Pad
  • RS232 Standard, SubD-9, Female
  • USB Optional: $95.00 (Option SVC-USB)
  • LabView Drivers Included
  • Laser Diode Connector: Threaded Lugs for Bolt-On Leads
  • Auxiliary Functions Connector: SubD-15 female
  • RS232 Connector: SubD-9, Female
  • Safety Interlock: Jack Connector, Stereo 3.5mm
  • Power Input: Universal 100V ~ 240 VAC, 50/60 Hz
  • Dimensions: 127 mm (H) x 200 mm (W) x 275mm (L)
Recommended Accessories
  • kab-39 Unterminated Connecting Cable -or-
    kab-231 Terminated Connecting Cable
  • acc-417 USB-RS232 Converter

Product Overview:

120 Amp Laser Driver Overview

The affordable LDC-581 laser diode drivers provide a maximum output of 120 Amps, 5 Volts, and can operate in high power CW (constant current) or QCW mode. They are designed specifically to safely drive fiber coupled bar modules and CCP style copper mount bars from companies such as DILAS and Coherent.

LDC-581 Laser Driver Features

The LDC-581 can drive full CW power up to 120 Amps, and the integrated function generator can be programmed to generate QCW pulses from 25 microseconds to CW. The QCW pulse mode feature is capable of delivering continuous pulses, single pulses, and pulse bursts which are internally or externally triggered.

Enhanced Protection for High Power Laser Diode Bars & Arrays

These current sources feature multiple levels of built-in laser diode protection which have been optimized for bars and arrays. One of the unique features is a user programmable soft-start ramp of the bias current to the device under test. The factory sets the ramp time to 300 milliseconds as a default, but the user can adjust this time period from 1 millisecond up to 10's of seconds. This current ramp up and down function is designed to protect the laser from thermal shock during power up and down sequences. The 581 also offers features such as current limit, a brown-out and black-out power surge clamp, AC line filters, and a fast response to shunt the current in the event of an open circuit. There is an interlock safety connection as well as a front panel Emergency-Stop kill switch to ensure the laser is operated only when the user has determined it is safe to do so.

Laser Driver Control User Interface

The LDC-581 front-panel controls provide fast and simple setup, and an RS232 interface with LabView drivers is included standard. The LabView GUI makes set-up and control of the system fast and simple. An optional USB digital interface is available; inquire for details on ordering the USB control option.

Controller Interface

The LDC-581 utilizes high current M4 style connectors on the rear panel. Additionally, a 15-pin D-sub connector is included for ancillary control functions, including external photodiode measurement, Laser-On Indicator LED, temperature sensor input, and an external cooling fan control.

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