The PolySense team has just published on the Sensors and Actuators A: Physical a new article on the realization of a build-up cavity for applications in intracavity-QEPAS systems. The following link provide access to the article.
http://polysense.poliba.it/wp-content/uploads/2018/02/94_I-QEPAS-Sens-Act-A_2017.pdf