Laser Diode Module

The Laser Diode Module is a compact, powerful module designed to emit coherent light. It combines a laser diode, lens, and circuitry to control its output, making it suitable for a variety of applications such as optical communications, barcode scanning, and laser pointers. Laser diodes in these modules are often mounted in a heat sink for better thermal management, ensuring stable performance over time.

Specifications

• Wavelength: Typically 650nm (Red) or 850nm (Infrared)
• Operating Voltage: 3V to 5V DC
• Output Power: 5mW to 50mW depending on module specifications
• Beam Divergence: Typically between 0.5° to 1° (depends on module design)
• Working Current: Around 20mA to 40mA
• Size: Small modules (typically 12mm x 30mm)

Pinout

Laser Diode Modules typically have the following pinout configuration:

• VCC (Pin 1): Connect to the positive terminal (3V-5V)
• GND (Pin 2): Connect to the ground (0V)
• Enable (Pin 3): Control pin to turn the laser on/off (optional in some modules)

Applications

Laser Diode Modules are used in a wide range of applications, such as:

• Laser Pointers: Used in presentations or as handheld tools.
• Optical Communications: Transmitting data through fiber optics or free-space optics.
• Barcode Scanning: Used in barcode scanners to read information.
• Laser Projectors: Used for projecting images or animations.
• Laser Engraving and Cutting: Used in industries for precision cutting and engraving.
• Medical Applications: Laser diodes are used in diagnostic tools and laser therapy.

Key Features

• Compact and Efficient: Small in size but highly efficient, ideal for portable projects.
• Low Power Consumption: Operates on low voltage (3V-5V) with minimal current draw.
• Monochromatic Light: Produces light at a single wavelength (color), essential for various precise applications.
• Stable Performance: Long-lasting and reliable with proper use and care.
• Easy to Use: Comes with a built-in driver circuit in many modules for straightforward operation.

Wiring Diagram

Here’s how to wire up a typical laser diode module:

        +--------------------+    +------------------+
        | Laser Diode Module |    | Power Supply     |
        |                    |    | (e.g., 5V)       |
        +--------------------+    +------------------+
        | VCC (Pin 1)        |-------------------> Positive (+)
        | GND (Pin 2)        |-------------------> Ground (-)
        | Enable (Pin 3)     |-------------------> Control (optional)
        +--------------------+    +------------------+
    

Sample Code (Arduino)

This Arduino code demonstrates how to control a laser diode module:

// Simple Arduino code to control a laser diode module

const int laserPin = 9; // Pin connected to the laser module's "Enable" pin

void setup() {
  pinMode(laserPin, OUTPUT); // Set laserPin as an output
}

void loop() {
  digitalWrite(laserPin, HIGH); // Turn on the laser diode
  delay(1000); // Laser stays on for 1 second
  digitalWrite(laserPin, LOW); // Turn off the laser diode
  delay(1000); // Wait for 1 second before turning on again
}
    

Installation Tips

• Ensure proper heat dissipation. Some laser diode modules may require a heat sink to avoid overheating.
• Use a current-limiting resistor or a driver circuit to avoid burning out the diode.
• Handle with care as the laser output can be harmful to the eyes. Always avoid direct exposure to the beam.
• Make sure the module is operated within the recommended voltage and current ranges for optimal performance and longevity.