Title :
Phase-matching in gases simultaneously pumped by Bessel and Gaussian beams
Author_Institution :
Laser Res. Center, Vilnius Univ., Lithuania
Abstract :
Summary form only given. The picosecond Nd:YAG laser with passive mode-locking and passive negative feedback has been used for the experiments.For the excitation of sodium we have used the second harmonic beam of this laser focused with an axicone (Bessel pump) together with the signal wave of the KH/sub 2/PO/sub 4/ (KDP) optical parametric generator (OPG). When the wavelength of the OPG output beam was about 962 nm, the two-photon resonance 3S-3D of sodium was excited and resulted in four-photon parametric superfluorescence.
Keywords :
laser beam effects; laser feedback; laser mode locking; multiphoton processes; optical frequency conversion; optical parametric devices; optical phase matching; optical pumping; resonant states; sodium; superradiance; two-photon processes; 962 nm; Bessel beams; Bessel pump; Gaussian beams; KDP OPG; KH/sub 2/PO/sub 4/; KH/sub 2/PO/sub 4/ optical parametric generator; Na; OPG output beam; axicone; four-photon parametric superfluorescence; gases; passive mode locking; passive negative feedback; phase-matching; picosecond Nd:YAG laser; second harmonic beam; signal wave; simultaneously pumped; sodium excitation; two-photon resonance; Frequency conversion; Gas lasers; Gases; Laser beams; Laser excitation; Laser feedback; Laser mode locking; Negative feedback; Optical frequency conversion; Pump lasers;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-663-X
DOI :
10.1109/QELS.2001.961954
