Browsing by Author "Huang, JYJ"

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Diode-pumped passively mode-locked multiwatt Nd : GdVO4 laser with a saturable Bragg reflector
(2003-09-20)
He, JL
;
Lee, CK
;
Huang, JYJ
;
Wang, SC
;
Pan, CL
We report a first demonstration, to our knowledge, of a cw passively mode-locked Nd:GdVO4 laser (lambda = 1063 nm). A relaxed saturable Bragg reflector was used. The laser generates pulses of 9.2 ps at a repetition rate of 119 MHz. As much as 5.4 W of average power was realized with a slope efficiency of 25.7%. (C) 2003 Optical Society of America.
Theoretical and experimental studies of tunable ultraviolet-blue femtosecond pulses in a 405-nm pumped type I beta-BaB2O4 noncollinear optical parametric amplifier and cascading sum-frequency generation
(2004-08-01)
Lee, CK
;
Zhang, JY
;
Huang, JYJ
;
Pan, CL
;
光電工程學系
Femtosecond laser pulses that are tunable from 380 to 460 nm were directly generated from a 405-nm-pumped type I beta-BaB2O4 noncollinear optical parametric amplifier (NOPA). A white-light supercontinuum from a CaF2 plate excited by 810-nm pulses was seeded into the NOPA. A theoretical analysis showed that the near-UV-to-blue radiation generated is attributable to cascaded sum-frequency generation (SFG) of the output of the NOPA and the residual fundamental beam at 810 nm. One can tune the blue-UV light by either changing the orientation of the NOPA crystal or adjusting the angle between the pump and the seeding pulse. The optical conversion efficiency from the 405-nm pump to the tunable SFG radiation is more than 5%. (C) 2004 Optical Society of America.