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Laser Diode Technologies

Tools of the trade - Vol 18 - 36188 4A Laser Diode Controller & Optional IEEE-488

Laser/TEC DriversBenchtop Laser/TEC DriversBenchtop Laser/TEC Drivers Laser/TEC Drivers

LDC340 Specifications LDC340 General Data

PlatformsLaser/TEC PlatformsLaser/TEC â–  Laser Diode Current Control:
â–  0 to ±1A and 0 to ±4A Protection Features: Soft Start, Interlock, Short Circuit when off,Laser Current Limit, Laser Power Limit, Over TemperatureProtection, Temperature Window Protection (with TED350), Open Circuit Detection
OEM Drivers OEM Drivers â–  Setting Resolution: 1mA-(70µA with IEEE-488)
Laser Mounts Laser Mounts 1mA (15µA with IEEE-488)
â–  Measurement Resolution:
â–  Displayed Laser Parameters : Laser Current, Monitor Current(internal and external), Laser Current Limit, Monitor Current Limit,Output Power, Laser Voltage, Photodiode Bias Voltage
Laser Diodes Laser Diodes â–  Laser Diode Current Accuracy: ±4mA
Pigtailed Lasers Pigtailed Lasers â–  â–  Noise (10Hz-10MHz, RMS), typ.: IEEE 488.2 Interface: 16 Bit Setting & 18 Bit Measurement Resolution <30µA
Laser Modules Laser Modules â–  Weight: <7kg
â–  Ripple (50/60Hz, RMS), typ.: <6µA
â–  Dimensions (W x H x D): 220 x 110 x 351mm
Accessories Accessories â–  Transients, typ.: <4mA
â–  Line Voltage: 100V, 115V, 230V +15%/–10%
â–  Drift(24 hrs,0-10Hz), typical: <300µA
â–  Line Frequency: 50 to 60Hz
â–  Temperature: <50ppm/°C
â–  Maximum Power Consumption: 125VA
â–  Compliance Voltage: >6V
â–  Operating Temperature: 0 to +40 °C

Laser Diode Power Control

â–  Storage Temperature: -40 to +70 °C
â–  Photo Current Control Range: 50µA to 2mA and 10mA (2 Ranges)
â–  Setting Resolution: 0.1µA and 1µA(0.03µA and 0.3µA with IEEE-488) External Analog Modulation The analog control input located on the front panel “MOD IN” enables the modulation of the laser diode in constant current as well as in constant power mode.For monitoring purposes an output voltage proportional to the laser currentis provided at the ANALOG OUT jack, also located on the front panel.
â–  Measurement Resolution: 0.1µA and1µA (0.01µA and 0.1µA with IEEE-488)
â–  Accuracy: ±2µA and ±20µA Monitor Photodiode Dual Input Feature
â–  Reverse Bias Voltage Photodiode: The LDC340 provides two independent monitor photodiode inputs. The two separate photodiode inputs are provided to allow the system to operate as acomplete laser diode test station by implementing a second external calibratedphotodiode to replace an optical power meter. The main photodiode is connected through the rear panel DB9 connector. The second photodiode can be connected to the auxiliary photodiode BNC input with the readings available through the LDC340.The main photodiode input is switchable to allow for different responsivitiesof the monitor photodiode. In switch position 1 the maximum photodiodecurrent is 2mA; in switch position 2 the maximum is 10mA. Additionally, the main photodiode input also allows for a photodiode bias voltage. Adding a bias voltage to the photodiode will improve the linearity of the diode. The auxiliaryphotodiode provides a fixed input current range of 50µA to 2mA. 0 to 10V Monitor Photodiode Calibration Feature

Laser Diode Current Limit

â–  The main photodiode can be calibrated via a front panel trim potentiometer. This feature allows a calibrated front panel display of the laser diode power directly in milliwatts.Additionally, the potentiometer labeled “CP GAIN” at the rear of the unitmay be used to adjust the gain of the constant power mode control loop.This allows the servo circuit that stabilizes the laser power to be adjusted for optimal performance.The photodiode signal is also used to limit the maximum output power of thelaser. When operating in either mode - constant current or constant power - thefront panel PMON trim-pot can be set to limit the photo-current of the monitordiode, thus ensuring that the output power of the laser stays within safe limits. Operating the controller with the interface improves the resolution of many of the measurement parameters; the affected parameters are indicated in the specification tables. Setting Range: 0 to ≥ 4A
â–  Resolution: 1mA
â–  Accuracy: ±10mA

Modulation, Analog Control

■ Input resistance: 10k Ω
â–  Modulation Coefficient, CC: 400mA/V ±5%
â–  Small Signal 3dB-bandwidth, CC: DCto 50kHz
â–  Modulation coefficient, CP: 0.2mA/V ±5% for 1A Operation2mA/V ±5% for 4A Operation

Control Output for Laser Current

■ Load Resistance: 10k Ω
â–  Transmission Coefficient: 2.5V/A ±5%

Laser Voltage Measurement

â–  Measurement Principle: 4-Wire
â–  Range: 0 to 10V
â–  Resolution: 1mV(100µV with IEEE-488)
â–  Accuracy: ±10mV

Photodiode Current Limit

■ Setting Range: 0 to ≥ 2mA and ≥ 10mA
â–  Resolution: 0.1µA and 1µA
â–  Accuracy: ± 20µA and ±200µA
All data valid at 23 ±5°C and 45 ±15% relative humidity ITEM$£ ¥DESCRIPTION LDC340$1,980.00 £1,100.00 1.650,00¥264,000 Bipolar Laser Diode Controller 1A/4 ALDC340-IEEE$2,340.00£1,300.00 1.950,00¥312,000Bipolar Laser Diode Controller 1A/4 A with IEEE 488.2 Sales: 973-579-7227
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