Based on the high photoluminescence quantum yield, broad absorption spectrum, and narrow symmetrical emission spectrum, perovskite quantum dots (QDs) have been adopted in pulsed laser generation as a saturable absorber, either organic or inorganic perovskites. In the paper, we improved the nonlinear absorption of CsPbBr3 QDs by non-covalent doping of Au particles, and the nonlinear absorption properties of the prepared Au-doped CsPbBr3 saturable absorber(SA) were characterized using the Z-scan system. A Q-switched laser output characteristics were obtained by building a Nd:YLF laser. We obtained a stable output average power of 815 mW and the minimum pulse width was 304ns. It shows that quantum dots can be modified to obtain better nonlinear coefficients by doping, showing potential application in the field of laser modulation.
Due to the advantages of ultra-broad bandwidth absorption and easy fabrication, passively mode-locked ultrashort lasers using two-dimensional (2D) materials as saturable absorbers (SA) have attracted extensive attention in recent years. In this experiment, the structure and light absorption properties of 2D nickel-cobalt layered double metal hydroxide (NiCo-LDH) nanosheets are characterized. The nonlinear absorption coefficient of NiCo-LDH are measured by Z-scan method to be -1.1 cm/GW. Using the NiCo-LDH SA, passively mode-locking is realized in a Nd:YVO4 bulk laser near 1 μm, a Nd:Y0.15V0.85O4 bulk laser near 1.3 μm and a Tm:YAG ceramic bulk laser near 2 μm. In the 1 μm passively mode-locking experiment, a continuous wave mode-locking (CWML) laser is obtained at 1065.92 nm with a repetition rate of 69 MHz and a pulse width of 18.0 ps. To our knowledge, this is the first time a CWML laser has been obtained using a layered double hydroxides (LDHs) SA. In addition, Q-switched mode-locking (QML) lasers are obtained based on NiCo-LDH SA at 1.3 μm and 2 μm. The experiments demonstrate that NiCo-LDH mode locking is a very promising practical technique for directly generating ultrashort pulsed laser from a laser oscillator.
Two-dimensional (2D) materials tin disulfide (SnS2) has been extensively researched in electronic, optoelectronic, energy storage, and conversion applications for large electronegativity, suitable band gap, earth abundance, and nontoxicity. In our work, the structure and nonlinear optical characteristics of SnS2 was characterized, and the performance of generating 1.34 μm ultrafast laser was explored. A 1.34 μm passively mode-locked Nd: Lu0.15Y0.85VO4laser is demonstrated based on a SnS2 saturable absorber prepared by a liquid phase exfoliation method. Owing to shorter upper-level lifetimes of the Nd: Lu0.15Y0.85VO4 mixed crystal, a passively Q-switched mode-locked (QML) laser was successfully realized at 1.34 μm. Under an absorbed pump power of 7.12 W, the mode-locked pulse as short as 25 ps was obtained with a repetition rate of 134 MHz and a maximum average output power of 651 mW at the corresponding laser spectral center of 1343 nm.
The application of two-dimensional (2D) materials as saturable absorbers (SAs) in ultrafast solid-state lasers has become a research hotspot due to its broadband absorption properties and simple fabrication process. However, the development of ultrafast solid-state lasers based on 2D material SAs is not mature, especially for mid infrared wavelengths. In this paper, the morphology and optical properties of zirconium pentatelluride (ZrTe5) are characterized. Using ZrTe5 as SAs, the picosecond continuous wave mode-locked (CWML) pulses with repetition frequencies of tens of MHz are obtained at 1 nm, 1.3 nm and 2 nm, respectively. The corresponding spectral centers are 1065.6 nm, 1343.3 nm and 2014.3 nm, respectively. For the 3 nm ultrashort laser, a passively mode-locked solidstate laser based on two-dimensional materials is realized for the first time, and a passively Q-switched mode-locked pulse with a pulse width of 800 ps and a repetition frequency of 180 MHz is obtained. Our results demonstrate the excellent modulation effect and great application potential of ZrTe5 in solid-state ultrafast lasers, which also proves the broadband absorption characteristics of ZrTe5.
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