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Benchtop Low Noise Laser Diode Driver; Advanced Multi-Level Laser Diode Protection; 14A / 24V Driver Range

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  • High Compliance Benchtop Laser Diode Driver
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  • 14A Benchtop Laser Diode Driver

$2595.00  
sku / item#: LDI-127
ships: Request a Quote for Current Ship Date

Key Features
  • Multiple Layers of Laser Diode Protection:
    - User Adjustable Current & Voltage Limits
    - User Adjustable Soft-Start Current Ramp
    - Protection Against Power Black-Outs & Surges
    - Laser Diode Over-Temperature Shut-Down / External Monitor & Shut-Down
  • CW and QCW Modes of Operation // USB and RS232 Interface, LabVIEW Drivers
Product Warranty
All products purchased from Laser Lab Source
are sold with a full one-year warranty.
See terms & conditions for full details.
The Laser Lab Source group websites include:
  • LaserDiodeSource.com
  • LaserLabSource.com
  • LaserDiodeControl.com

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).


This cable is also available terminated on the controller
end with a 2W2 d-sub connector (male) and a
2W2 d-sub connector (female) on the device end (kab-297).


This cable is also available terminated on the controller
end with a 2W2 d-sub connector (male) and unterminated
on the device-end (kab-286).

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Why do Scientists & Engineers Choose Laser Lab Source?

MODEL LDI-127
PRICE $2595.00
LASER DIODE CURRENT and voltage OUTPUT
  • Compliance Voltage Range: 0.00 - 24.00 Volts
  • Output Current Range: 0.00 - 14.00 Amps
  • Current Noise & Ripple: < 1% of Imax (rms)
  • Current Setpoint Resolution: 3.5 mA
  • Current Setpoint Accuracy: ± 0.5%
  • Current Stability (4 hours): ≤ 100 ppm
  • Current Limit Setpoint Accuracy: ± 2%
INTEGRATED LASER DIODE PROTECTION FEATURES
  • Programmable Soft-Start Current Ramp to Set Point (300ms Default)
  • Independent Pilot Laser Output (5V, 150mA max)
  • User-Programmable Current Limit
  • Open Circuit Detection
  • ESD and Power Surge Clamp, AC Line Filter
  • Reverse Voltage Transient Clamp
  • Rear Panel Keylock Switch and Safety Interlock
  • Short Circuit when Laser Diode Current Turned OFF
INTERNAL PULSE MODE
  • Pulse Width Range: (model specific) 10 µs - 71 minutes
  • Pulse Period Range: Pulse Width + 100 µs
  • Time Base Accuracy: ± 1%
  • Pulse-to-Pulse Accuracy: 30 µs
  • Pulse Rise Time: ~ 18 µs
  • Pulse Fall Time: 70% - 100% of Rise Time
MODULATION AND QCW MODE
  • QCW Mode Rise / Fall Time: 20μs to CW, 10%-90% (< 5μs on request)
  • QCW Trigger: Internal Pulse Generator or External
  • Modulation Input (BNC): Digital (TTL) or Analog
  • Modulation BNC Input Impedance: 10K
  • Modulation Input Voltage Range: 0 ~ 4 Volts (4V = Max Current)
  • Analog Modulation Bandwidth: 1 Hz – 20 kHz
Auxiliary Functions
  • Temperature Sensor Input: 10kΩ NTC Thermistor
  • External Fan Control Circuit, 1 - 24V, 300mA (max)
  • Laser-On External LED Indicator: 5mA Output
  • Pilot Laser Anode, vs. Ground
  • Photodiode Current Measurement Accuracy: ± 0.5%
  • Photodiode Current Measurement Range: 0.00 - 700 μA
USER INTERFACE
  • Front Panel: Alphanumeric LCD
  • RS232 Standard
  • USB Option Included
  • LabView Drivers Included
DIMENSIONS AND power INPUT
  • Universal 110V ~ 240 VAC Input
  • 95mm (H) x 119mm (W) x 280mm (L)
Recommended Accessories
  • kab-39 Unterminated Connecting Cable
  • kab-286 Unterminated Laser Diode Current Cable
  • acc-417 USB-RS232 Converter (included)

Product Overview:

LDI Series Laser Diode Drivers

The LDI series laser diode diode drivers are precision-engineered to electrically bias high power laser diodes while protecting them from the common causes of damage which can potentially harm or destroy semiconductor lasers. Because high power lasers require relatively high levels of DC current and voltage, and generate high levels of waste heat, they have a unique set of electrical and thermal requirements which need to be addressed to protect them from being damaged. Additionally, the driver has been designed with features to assist the user to safely operate the laser diode under test.

Laser Diode Protection Features

These units offer the highest level of commercially available laser diode protection to ensure that your laser is protected from damage. Current and voltage limits, upper and lower temperature limits, and a fast shut-down sequence keep your device protected at all times. The following protection features combine to safeguard your laser diode:
  • Polarity Check: A dedicated circuit biases the laser with a very small power level to ensure that it is installed properly to prevent damage caused by incorrect wiring.
  • Soft-Start Current Ramp: Gradually increases current to prevent sudden surges that could damage the laser diode. The LDC series units offer the ability for the user to customize the ramp time if desired. The factory default is set to 300 milliseconds.
  • Over-current Protection: Prevents excessive current from flowing into the laser diode.
  • Over-voltage Protection: Limits the voltage applied to the laser diode.
  • Reverse Voltage Protection: Protects against accidental polarity reversal which can permanently damage the diode.
  • Thermal Shutdown: Monitors the laser temperature and automatically shuts down if over-heating occurs.
  • Current Limit: Allows users to define a maximum current threshold to safeguard the diode.
  • Compliance Voltage Limit: Ensures the voltage supplied to the diode remains within safe operating conditions.
  • Transient Suppression: Filters out power supply transients and electrical noise that could cause instability.
  • Short-Circuit Protection: Detects and prevents damage caused by accidental short circuits in the laser diode current circuit.
  • Interlock Safety Mechanism: Requires an external hardware switch or key to enable laser operation, adding an extra layer of safety.

Constant Current Source Laser Diode Driver

The LDI series drivers are based on high stability, low-noise current source topology to ensure optimal performance from your laser diode. They provide exceptionally low drift, allowing for consistent and repeatable results. The constant current source topology is based on a precision sense resistor which is placed in series with the laser diode. The voltage across this sense resistor is fed into a differential amplifier, which compares it to the reference voltage. If the measured current deviates from the setpoint, the feedback loop adjusts the control voltage applied to the pass transistor (MOSFET). The transistor acts as a variable resistor, dynamically adjusting to maintain the desired current. The current source automatically adjusts its output voltage to meet the laser's requirements while keeping the current constant.

Modulation, Internal Function Generator and QCW Modes

In addition to CW (continuous wave) mode of operation, the LDI series laser diode drivers offer flexible modulation capabilities and a built-in QCW function generator. The rear panel of the controller has a BNC input for analog or TTL digital modulation inputs with a 10k Ω input impedance. The controller has an internal function generator which can be used to set the quasi-CW (QCW) pulses. In QCW mode, the user can also set QCW pulses from a remote TTL signal source or by using the internal function generator.

User Interface: Front Panel LCD Display with Keypad (model dependent)| RS232 & USB Interfaces | Analog Signal Controls

These driver & tec controller units offer multiple user interface options. Depending on the model, the user has complete control of all laser diode parameters through an intuitive front panel menu. The front panel has an LCD display with a keypad. For remote control, all models come standard with a RS-232 interface and USB adapter. For all models, the LabView GUI (included) makes set-up and control of the system fast and simple. An open-source terminal software program is also available for download. The user can also control the unit using analog controls signal inputs available on the rear panel.

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