演讲摘要：

The generation of nanolaser is a crucial step for on-chip optical communications, medical imaging and so on. Here, we report a thresholdless, tunable Raman nanolaser based on Selective Surface Plasmon Amplification by Stimulated Raman Scattering (SSPASRS). The surface Plasmon is formed between atomic-scale ZnO layer and grapheme layer, in which ZnO layer act as gain medium for Raman scattering. The special geometry, in which atomic-thick gain medium are in the interior of the conducting medium of surface Plasmon, is crucial for highly directional preferred selection rule of Raman active vibration modes for thresholdless Raman nanolaser. Unlike conventional nanolasers with fixed emission wavelength, Raman scattering process convert pump laser into new frequencies, so Raman nanolasers allows for tunable nanolasers by varied pump lasers to substantially expand the range of nanolasers. Passively Q-switching and mode-locking fiber lasers have been widely fulfilled by using single-walled carbon nanotubes (SWCNTs) as saturable absorber (SA). However, most of current devices can only operate with one determined operation state, which highly limits its application in photonic devices. Here, we report operation switchable fiber lasers by using well-aligned (2,2) single-walled carbon nanotubes (SWCNTs) as saturable absorber. These SWCNTs are fabricated in the elliptical nanochannels of ZnAPO4-11(AEL) zeolite single crystal, which features anisotropic optical absorption. Thus, these SWCNTs can act as an excellent polarization sensitive saturable absorber for the wide-band optical pulse generation andlaser operation states manipulation. By putting a SWCNTs@AEL single crystal into erbium-, andytterbium-doped fiber laser cavities, stable mode-locking and Q-switching pulses can be switched by simply adjusting a polarization controller under a fixed pump power, respectively.