Browsing by Author "Liu, ZL"

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Efficient terahertz radiation generation from a bulk InAs mirror as an intracavity terahertz radiation emitter
(2000-04-15)
Liu, ZL
;
Ono, S
;
Ohtake, H
;
Sarukura, N
;
Liu, TA
Terahertz (THz) radiation is generated efficiently from a bulk InAs mirror with a shallow incidence angle inside the cavity of a femtosecond, mode-locked Ti:sapphire laser self-started by a strained saturable Bragg reflector A magnetic field is also applied to the InAs mirror to enhance THz radiation.
High average power mode locked Ti : Sapphire laser with intracavity continuous-wave amplifier and strained saturable Bragg reflector
(1999-10-01)
Liu, TA
;
Huang, KF
;
Pan, CL
;
Liu, ZL
;
Ohtake, H
We demonstrate a new scheme for the generation of high average power femtosecond pulses by incorporating an intracavity amplifier and a strained saturable Bragg reflector with low saturation fluence for self-starting mode locking. When the Ti:sapphire oscillator and intracavity amplifier are pumped at 10W and 15W, respectively, the average output power is as high as 1.62 W. The pulse duration is about 145 fs, and the peak power reaches 160 kW at a 68 MHz repetition rate: The pulse-formation time of 400 mu s is sufficiently short to sustain stable mode locking.
THz radiation from intracavity saturable Bragg reflector in magnetic field with self-started mode-locking by strained saturable Bragg reflector
(1999-11-15)
Liu, TA
;
Huang, KF
;
Pan, CL
;
Liu, ZL
;
Ono, S
We demonstrate a new configuration for intracavity generation of THz radiation. A magnetic-field-biased saturable Bragg reflector (SBR) located inside the femtosecond laser cavity is the emitter, while a strained saturable Bragg reflector (SSBR) achieves self-started mode-locking without focusing. The calibrated power of the emitted THz radiation is estimated to be approximately 45 nW with a peak frequency at 0.72 THz and width of approximately 0.7 THz under a 0.88 T magnetic field. The quadratic dependence of THz-radiation power by the SBR on the magnetic field is also observed for the first time.