Abstract
Molecular gases like ammonia (NH 3 ) and deuterium oxide (D 2 O) can be used as active media for optically pumped terahertz lasers (OPTL). In this paper we present spectroscopic measurement of chosen NH 3 and D 2 O lasing lines near 1 THz. Rotational-vibrational transitions are pumped by mid infrared quantum cascade laser (MIR QCL) which offers more precise tunability in MIR spectral range than standard optical pumping methods (CO 2 , N 2 O lasers). This allows to access new lasing lines. Frequency domain measurements of NH 3 and D 2 O under different pressure, pumping frequency and pumping power are performed. The results show high gain obtained for NH 3 (3,3) line at 1.073 THz and very low gain for D 2 O (4,3,2) line at 533 GHz due to the low population.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
