Title :
On the role of the coherence width and its evolution in a short-pulse fundamental beam in second harmonic generation from beta-barium borate
Author :
Prakash, Om ; Dixit, S.K. ; Bhatnagar, R.
Author_Institution :
Laser Syst. Eng. Div., Centre for Adv. Technol., Indore, India
fDate :
6/1/2002 12:00:00 AM
Abstract :
The paper discusses the influence of the evolution of the spatial coherence of the fundamental beam on second harmonic generation (SHG) of copper vapor laser beams in beta-barium borate (BBO) crystals. It is established that a coherence parameter, defined, as the ratio of the coherence width to the full beam cross-section, can uniquely be used to compare the performance of beams from different resonators for SHG. Fundamental beams with average coherence widths varying from a fraction of the beam cross-section to the full cross-section were used. It is established, from time-resolved and averaged studies, that in line-focusing geometry, SHG is primarily governed by this coherence parameter
Keywords :
barium compounds; copper; gas lasers; laser beams; laser cavity resonators; light coherence; optical harmonic generation; BBO; BaB2O4; Cu; averaged studies; beta-barium borate crystals; coherence parameter; conversion coefficient; copper vapor laser beams; generalized diffraction filtered resonator; line-focusing geometry; second harmonic generation; short-pulse fundamental beam; spatial coherence width evolution; time-resolved studies; unstable resonator; Copper; Diffraction; Frequency conversion; Gas lasers; Laser beams; Optical pulses; Polarization; Pulse measurements; Pulsed laser deposition; Resonator filters;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2002.1005410
