Title :
Phase locking a 4.7 THz quantum cascade laser using a super-lattice diode as harmonic mixer
Author :
Khudchenko, A.V. ; Hayton, D.J. ; Pavelyev, D.G. ; Baryshev, A.M. ; Gao, J.R. ; Kao, T.-Y. ; Hu, Q. ; Reno, J.L. ; Vaks, V.L.
Author_Institution :
SRON The Netherlands Inst. for Space Res., Netherlands
Abstract :
We have phase locked a 4.7 THz Quantum Cascade Laser (QCL) to a stable microwave reference signal. The QCL is a 3rd order distributed feedback (DFB) laser with a low power consumption of 0.5 W and radiation power of about 0.25 mW. One of the key elements in our experimental setup is a superlattice diode operating as a harmonic mixer and providing the beat signal between the QCL and the 24th harmonic of a 198 GHz reference signal. A phase locked beat signal is about 20 dB above the noise level for a 30 KHz resolution bandwidth.
Keywords :
distributed feedback lasers; laser mode locking; laser noise; microwave photonics; optical harmonic generation; quantum cascade lasers; semiconductor diodes; semiconductor superlattices; bandwidth 30 kHz; frequency 4.7 THz; harmonic mixer; noise level; phase locked beat signal; power 0.25 mW; power 0.5 W; quantum cascade laser; stable microwave reference signal; super-lattice diode; third-order distributed feedback laser; Bandwidth; Harmonic analysis; Masers; Microwave oscillators; Mixers; Quantum cascade lasers; Signal resolution;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956455
