Compact and low-cost THz QTDS system.

Area of Science:

• Terahertz spectroscopy
• Spectroscopic instrumentation
• Optoelectronics

Background:

• Terahertz quasi time domain spectroscopy (QTDS) is a powerful technique for material characterization.
• Traditional QTDS systems can be expensive and bulky, limiting their accessibility.
• Integration of compact electronic components offers potential for miniaturization.

Purpose of the Study:

• To develop a more cost-effective and compact terahertz quasi time domain spectroscopy (QTDS) system.
• To demonstrate the feasibility of using a Raspberry Pi and sound card for system control and data acquisition.
• To evaluate the performance of a QTDS system utilizing repurposed DVD drive mechanics for the optical delay line.

Main Methods:

• Direct mounting of a diode laser onto an optical delay line for compactness.
• Utilizing a Raspberry Pi and a sound card to replace conventional laboratory equipment (computer, lock-in amplifier, stage controller, signal generator).
• Characterization of a system employing both a commercial stepper motor delay line and repurposed DVD drive mechanics.

Main Results:

• Achieved significant cost reduction and improved compactness in the QTDS system setup.
• Successfully operated the QTDS system using a Raspberry Pi and sound card, replacing multiple expensive instruments.
• Demonstrated the potential of repurposed DVD drive mechanics as a viable, low-cost optical delay line component.

Conclusions:

• The developed Raspberry Pi-based QTDS system offers a highly accessible and affordable alternative for spectroscopic analysis.
• The system's compact design and reduced component count make it suitable for various research and educational settings.
• Further investigation into repurposed mechanical components can lead to even more economical spectroscopic instrumentation.