All-optical frequency multiplication/recovery based on the semiconductor optical amplifier ring cavity;

Er-doped optical fiber ring cavity laser;

Based on the discrete algorithm of rate equations,an analysis of the dynamic behavior of Tm~(3+)-doped double-clad fiber laser with a ring cavity was carried out.

To investigate the output stability of a high power fiber ring laser system containing a birefrigent fiber,a kind of vector modulation instability — sideband polarization instability(SPI) was proposed.

A novel fiber ring laser s configuration is proposed and experimental study on it has been done.

Glass ring laser.

A ring-cavity erbium - doped fiber laser is reported.

Based on the character of the Erbium-doped fiber gain at 1550 nm, the ring-cavityErbium-doped fiber laser in this paper, by using 980nm semiconductor laser asdiode-pumped, Erbium-doped fiber as gain medium, Bragg fiber grating as resonantcavity reflector, has gotten output with 1551.

Based on the character of the EDF gain at 1550 mm, a laser diode (LD) worked at 980 nm and acted as the pumping source, a EDF employed as gain medium, and a fiber grating used as reflector, an ring-cavity all-fiber laser worked at 1552.

A spherical reflector is used to realize mode coupling between laser cavity and ring resonator.

In order to improve the switch efficiency of the output parametric laser,a ring resonator was adopted.

The ring resonator was designed and a sequence of Q switch pulses using Cr 4+ ∶YAG crystals of different initial transparences were observed and analyzed.

A single-longitudinal-mode(SLM) Brillouin erbium-doped fiber laser(BEDFL) with multiple-ring cavities(MRC) and fiber Bragg grating tunable filter(FBG-TF) is proposed and demonstrated.