FreiLaser: Flexible pulse generator for laser control in optogenetic experiments.

Area of Science:

• Neuroscience
• Biotechnology
• Engineering

Background:

• Optogenetics requires precise control of laser stimulation for neuroscience research.
• Existing laser control systems can be expensive and complex.
• A need exists for cost-effective, versatile, and user-friendly laser control solutions.

Purpose of the Study:

• To design and validate FreiLaser, an affordable and adaptable laser control system for optogenetics.
• To enable precise control over multiple laser parameters using a Raspberry Pi Pico.
• To integrate a user-friendly interface and mask controller for enhanced experimental control.

Main Methods:

• Development of FreiLaser using Raspberry Pi Pico microcontroller and CircuitPython.
• Implementation of precise control for up to four lasers via analog and digital signals.
• Integration of a graphical user interface (GUI) for parameter configuration and real-time visualization.
• Inclusion of a mask controller synchronized with laser pulses.
• API development for seamless integration with experimental setups.

Main Results:

• FreiLaser provides cost-effective laser control (<40 €).
• The system offers precise control over stimulation parameters for multiple lasers.
• Validation confirmed stable and temporally precise control signals suitable for various stimulation patterns.
• The GUI and API facilitate ease of use and integration.
• The mask controller effectively synchronizes LEDs with laser pulses.

Conclusions:

• FreiLaser is a flexible, user-friendly, and low-cost solution for optogenetic laser control.
• The open-source design promotes accessibility and adaptability for diverse neuroscience research.
• The system is well-suited for optogenetic and behavioral studies, reducing potential bias.