Rongyong Lin's research while affiliated with Shenzhen University and other places

... In contrast, the passive Q-switching employs a saturable absorber (SA), with low cost and ease of integration into fiber laser cavity, as an internal loss modulator. Since 1990's, SAs have been developed from semiconductor saturable absorber mirror (SESAM) [3,4] to nanomaterials with saturable absorption, such as carbon nanotubes (CNTs) [5][6][7][8], graphene [9][10][11][12][13][14][15][16][17], topological insulators (TIs) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], transition metal dichalcogenides (TMDs) [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][61][62][63]and black phosphorus (BP) [49][50][51]. Compared to SESAM, the nanomaterials mentioned above have broader absorption band from visible to mid-IR [9][10][11], faster electron relaxation time down to ~100 fs [52]. ...

... Different from active mode-locking techniques, passive mode-locking is simple, compact and low-cost without using active modulators in the laser cavity. Generally, passively mode-locked thulium-doped fiber lasers (TDFLs) can be implemented by nonlinear polarization rotation (NPR) [3], nonlinear amplifying loop mirror (NALM) [4] , nonlinear optical loop mirror (NOLM) [5], semiconductor saturable absorber mirror (SESAM) [6], graphene [7], topological insulator [8][9]. As carbon allotropes draw much attention recently, single-wall carbon nanotube (SWNT) has been demonstrated to possess ultrafast nonlinear optical responses [10] . ...

... Evanescent waves can be affected by magnetite ferrofluid solutions, which, in turn, would also affect the optical transmission response. Previous literature for a different application have used nanomaterials to affect optical light within the capillaries using the evanescent waves being focused around the PCF's core [15]. Thus, the evanescent wave theory for the dried magnetite affecting the optical transmission under magnetic field irradiation is plausible. ...

... Therefore, the femtosecond pulse is generated [21]. The GO, as a SA, can also be used to generate dissipative solitons in an ytterbium-doped fiber laser [22]. Through interaction between the evanescent field in a tapered fiber and GO, a mode-locked pulse with a 12-nm wide-broadband spectral bandwidth is obtained [23]. ...

... All fiber-format passively mode-locked (ML) laser systems have attracted considerable attention due to their wide range of applications in industry and scientific research [1]. Various material-based real SAs have been developed to actuate mode locking, such as semiconductor saturable absorption mirrors [2], single-walled carbon nanotubes [3], graphene [4], transition metal chalcogenides [5], topological insulators [6], black phosphorus [7], etc. However, these materials often have a fixed transmission and suffer from optical powerinduced thermal damage and oxidation, which restricts the damage threshold and longterm stability. ...

... Double cladding seven core photonic crystals [53] 2014 PCF based nano-displacement sensors [54] 2015 ...

... The complex fiber arrangement, low stability, and method of synthesis may influence the performance of SAs in Q-switching and mode-locking operations. Numerous experimental approaches such as depositing nanoparticles in the fiber cavity [28], thin film synthesis by solution method [29,30], and pulsed laser deposition technique (PLDT) [31,32] have been used for the insertion of SAs in the fiber cavity to achieve Q-switching and mode-locking operation. The thin film of Y 2 O 3 can be fabricated using several methods such as chemical vapor deposition [33], thermal decomposition [34], electron beam evaporation [35], pulsed laser deposition (PLD) [36], and ion beam sputtering [37]. ...

... Dual-wavelength mode-locked fiber lasers can be categorized into synchronous and asynchronous modes, depending on whether or not the output pulse sequences are synchronous. Due to the presence of dispersion in the cavity, fiber lasers exhibit slightly different repetition frequencies for different wavelength pulses, resulting in two pulse trains on the oscilloscope and two stable peaks on the spectrometer, which are known as asynchronous dual-wavelength mode-locked pulses [10][11][12]. Synchronous mode-locked fiber lasers are typically constructed using a shared cavity structure or a common saturable absorber in two separate fiber lasers, resulting in synchronous mode-locked pulse output. However, the synchronization produced by this method is closely linked to the cavity length of the fiber laser, causing poor stability of the output synchronized dual-wavelength pulses. ...