Spectroscopy in the far infrared wavelength regime below 1 THz is an important tool for various applications such as thickness measurements or gas sensing.  The fast MPY-RS2 detector with HDPE window is ideally suited to measure the spectrum of CW- terahertz radiation from 100 GHz to 1.4 THz.

We demonstrate the measurement of the voltage noise density in professional quality with a low-cost setup using a Red Pitaya and a simple python script.

Attenuating laser beams in the mid infrared can be achieved with various approaches. We show you the advantages and disadvantages of the different techniques.

Interferometry is a central building block for many optics measurements and a versatile tool in the laser lab. Here we describe the general working principle and give a systematic and simple setup and alignment procedure.

During my experience in laser labs we encountered many different approaches of how to align a delay stage. Therefore we would like to explain how it is done easily and as accurate as possible with the stage you have.