Speaker
Mr
Atif Shehzad
(University of Neuchatel)
Description
Sensitive spectroscopic methods for trace gas detection in the mid-infrared range often involve a modulated quantum cascade laser (QCL). Pure frequency modulation (FM) or amplitude modulation (AM) is preferable, while modulating the QCL current results in a combined AM-FM. Here, we demonstrate pure AM or FM realized with a QCL equipped with an integrated resistive heater (IH). By applying modulation signals with proper amplitude and phase to the QCL and IH currents, we show a reduction of the AM by more than 20 dB at two characteristic modulation frequencies of 1 kHz and 10 kHz, resulting in a pure FM, or vice-versa.
Author
Mr
Atif Shehzad
(University of Neuchatel)
Co-authors
Antoine Muller
(Alpes Lasers SA)
Mr
Pierre Brochard
(University of Neuchatel)
Mr
Renaud Matthey
(University of Neuchatel)
Mr
Richard Maulini
(Alpes Lasers SA)
Dr
Stephane Schilt
(University of Neuchatel)
Mr
Stéphane Blaser
(Alpes Lasers SA)
Prof.
Thomas Südmeyer
(University of Neuchatel)
Mr
Tobias Gresch
(Alpes Lasers SA)
