We alloyed Zn2+ into CsPbI3 perovskite nanocrystals by partial substitution of Pb2+ with Zn2+, which does not change their crystalline phase. The resulting CsPb0.64Zn0.36I3 exhibited an improved, close-to-unity photoluminescence quantum yield 98.5% due to the increased radiative decay rate and decreased non-radiative rate. They also showed enhanced stability, correlated improved effective Goldschmidt tolerance factors, incorporation ions a smaller radius than ions. Simultaneously, switched...

A 2D surface plasmon photonic crystal (SPPC) is achieved by implanting gold nanorods onto the periodic apertures of poly(methyl methacrylate) (PMMA) opal crystals. On SPPC, overall upconversion luminescence intensity NaYF4:Yb3+, Er3+ under 980 nm excitation improved more than 103 fold. The device easily shifted to a transparent flexible substrate, applied displays. As service our authors and readers, this journal provides supporting information supplied authors. Such materials are peer...

Ultrabroadband supercontinuum light expanding from ultraviolet to 6.28 μm is generated in a centimeter-long fluoride fiber pumped by 1450 nm femtosecond laser. The spectral broadening the caused self-phase modulation, Raman scattering and four-wave mixing. experimental simulated results show that promising candidate for generating midinfrared up 8 μm.

Unselectively enhanced multicolour upconversion (UC) emissions and low pumping threshold were achieved in Au@β-NaYF(4):Yb,Tm hybrid nanostructures. This demonstrates that the plasmon field enhancement effect is main reason for improved UC emission efficiency.

Cooperative luminescence (CL) occurs in spectral regions which single ions do not have energy levels. It was first observed more than 40 years ago, and all results reported so far are from a pair of ions. In this work, upconverted CL three Yb3+ the ultraviolet (UV) region under near-infrared (NIR) excitation. The UV intensity showed cubic dependence on NIR pump power, whereas lifetime nearly one-third triplet (TCL) has clear structure, most emission peaks consistent with self-convoluted...

Passive Q-switching was experimentally demonstrated in an erbium-doped fiber laser (EDFL) by using gold nanocrystals (GNCs). The GNCs were mixed with sodium carboxymethylcellulose (NaCMC) to form GNCs-NaCMC films. films exhibited a broad absorption band the range of 400–1750 nm. By placing film EDFL cavity pumped 980 nm diode, stable passive achieved for threshold pump power ∼30 mW, and 3.2 μs pulses at 1560 repetition rate 24.2 kHz obtained ∼125 mW.

We demonstrated a passively mode-locked erbium-doped fiber laser by using gold nanorods as saturable absorber. The (GNRs) were mixed with sodium carboxymethylcellulose (NaCMC) to form GNRs-NaCMC films. By inserting one of the films into an EDFL cavity pumped 980 nm diode, stable mode-locking was achieved threshold pump power ∼54 mW, and 12 ps pulses at 1561 repetition rate 34.7 MHz maximum average ∼2.05 mW obtained for ∼62 mW.

We report the coherent mid-infrared supercontinuum generation in an all-solid chalcogenide microstructured fiber with all-normal dispersion. The is a four-hole structure core material of AsSe2 and air holes that are replaced by As2S5 glass rods. Coherent light extended to 3.3 μm generated 2 cm long pumped 2.7 laser.

High power mid-infrared supercontinuum (SC) laser sources are important for a wide range of applications in sensing, spectroscopy, imaging, defense, and security. Despite recent advances on high SC using fluoride fibers, the lack fibers with good chemical thermal stability remains significant technological challenge. Here we show that all solid fluorotellurite developed can be used as nonlinear media constructing 10-W-level sources. All fabricated by rod-in-tube method. The core cladding...

A new type of saturable absorber (SA) based on gold nanorods (GNRs) for all-fiber passively Q-switched erbium-doped fiber laser (EDFL) is realized experimentally. The longitudinal surface plasmon resonance (SPR) absorption GNRs used to induce Q-switching. By inserting the SA in an EDFL cavity pumped by a 980 nm diode, stable passive Q-switching achieved with threshold pump power ~27 mW, and 4.8 μs pulses at 1560 repetition rate 39.9 kHz are obtained ~275 mW.

Y 2 O 3 : Eu nanotubes were fabricated by a surfactant assembly mechanism. The tubular structure was characterized transmission electron microscopy. Under an ultraviolet-light excitation, the show relatively intense emission peak at 618 nm besides 610 peak, different from that of single Y2O3:Eu nanocrystallites. results laser-selective excitation indicate centers near surface nanotube walls exhibit inhomogenously broadened spectra without spectral structures while two sites (sites B and C)...

Tellurite glass microstructure fibers with a 1 microm hexagonal core were fabricated successfully by accurately controlling the temperature field in fiber-drawing process. The diameter ratio of holey region to (DRHC) for fiber can be adjusted freely range 1-20 pumping positive pressure into holes when drawing fiber, which provides much freedom engineering chromatic dispersion. With increase DRHC from 3.5 20, zero dispersion wavelengths shifted several hundred nanometers, cutoff wavelength...

A highly nonlinear composite fiber, which has a 1.5 microm chalcogenide glass core surrounded by tellurite microstructure cladding, been fabricated the method of stack and draw. capillary containing As(2)S(3) rod was sealed with negative pressure inside. Then this other empty capillaries were stacked into tube, elongated cane. This cane then inserted another jacket tube drawn fiber. The fiber flattened chromatic dispersion together zero wavelength located in near infrared range. propagation...

We have fabricated a highly nonlinear complex microstructure tellurite fiber with 1.8 micron core surrounded by four rings of holes. The cane for the was prepared combining methods cast rod in tube and stacking. In process fiber-drawing positive pressure pumped into holes to overcome collapse reshape microstructure. correlations among pump pressure, hole size, surface tension temperature gradient were investigated. at bottom preform's neck region evaluated quantitatively an indirect method....

Monodisperse β-NaYF4:Yb,Tm nanocrystals (nanospheres and nanoplates) with a uniform size were successfully synthesized. By tuning the ratios of solvent, reaction temperature, time, we manipulated their phase, shape, in range 30–400 nm. As chelating agent shape modifier, oleic acid (OA) was introduced into mixtures played key role fine-tuning nanocrystals. Possible mechanisms proposed for forming products various architectures. Spectral analysis showed that excellent materials intense...

Gold nanorods (GNRs) were used as a saturable absorber (SA) for passive mode-locking at 1 μm wavelength. The GNR-SA film was fabricated by mixing GNRs with sodium carboxymethylcellulose. longitudinal surface plasmon resonance absorption of to induce mode-locking. By using the film, stable 1039 nm experimentally demonstrated in an ytterbium-doped fiber laser cavity pumped 980 diode. produced ~440 ps pulses repetition rate 36.6 MHz and average output power ~1.25 mW pump ~82 mW.

We demonstrated a passively mode-locked fiber laser operating at 1982 nm by using gold nanorods (GNRs) saturable absorber (SA). The GNRs SA was fabricated mixing with sodium carbonxymethyl cellulose. By inserting the into Tm-doped cavity pumped 1570 laser, stable mode-locking achieved threshold pump power of 224 mW, ~4.02 ps pulses repetition rate ~37.49 MHz, and maximum average ~6 mW obtained for ~265 mW.

The shortest ever recorded and enhanced 204.5 nm ultraviolet (UV) upconversion (UC) emission from 6G7/2 levels of Gd3+ ions was observed in NaLuF4:20%Yb3+,2%Ho3+,20%Gd3+ microcrystals (MCs) under 980 near infrared (NIR) excitation for the first time. 6GJ can be efficiently populated by energy transfer (ET) processes Yb → Ho Gd Gd. effect pH value on morphology MCs explored UC mechanisms tri-doped NaLuF4 samples were analyzed detail based spectra dependence luminescence intensity laser...

Broadband supercontinuum laser sources in the mid-infrared region have attracted enormous interest and found significant applications spectroscopy, imaging, sensing, defense, security. Despite recent advances using infrared fibers, average power of those is limited to 10-watt-level, further scaling over 50 W (or hundred-watt-level) remains a technological challenge. Here, we report an all-fiber source with spectral range from 1220 3740 nm, by low loss (<0.1 dB/m) fluorotellurite fibers...

Recent years have witnessed growing research interest in dual-wavelength mode-locked fiber lasers for their pivotal role diverse applications and the exploration of nonlinear dynamics. Despite notable progress development, achieving reliable operation typically necessitates intricate manual adjustments cavity’s polarization components. In this article, we present realization automatic mode-locking a soliton laser. To provide guidance algorithm design, systematically investigated impact...

Polymer waveguide devices have attracted increasing interest in several rapidly developing areas of broadband communications since they are easily adaptable to on-chip integration and promise low propagation losses. As a key member the gain medium, lanthanide doped nanoparticles been intensively studied improve downconversion luminescence. However, current research efforts almost confined erbium-doped amplifiers operating at C-band; boosting luminescence Tm3+ for S-band optical amplification...

We propose a strip loaded amplifier employing SU-8 as the waveguide and nanoparticles (NPs)-polymethyl methacrylate (PMMA) cladding layer. By leveraging undoped waveguide, polymer accomplished remarkably low transmission losses, reaching 1.8 dB/cm at 1530 nm. prepared NPs-PMMA nanocomposite by utilizing NaLu 0.1 Y 0.7 F 4 : Er 3+ , Yb @NaLuF core-shell nanoparticles, which exhibited significantly enhanced lifetime of 6.15 ms. An internal net gain up to 17.7 dB was achieved on with length...

Heavily erbium-doped low-hydroxyl fluorotellurite glasses with molar compositions of (85.7−x)TeO2 + xBaF2 4.8Na2CO3 9.5Er2O3 (x = 38.1, 28.6, 19) were fabricated. The maximum doping concentration erbium ions was up to 19 mol % by introducing BaF2 into the tellurite glass system. Under 980 nm excitation, intense emissions around 2.7 μm from 4I11/2 → 4I13/2 transition Er3+ observed in these glasses. efficient mid-infrared emission can be attributed existence cross relaxation (CR) 4I15/2...

Holmium (Ho3+)-doped fluorotellurite microstructured fibers based on TeO2–BaF2–Y2O3 glasses are fabricated by using a rod-in-tube method. By 1.992 μm fiber laser as the pump source, lasing at 2.077 is obtained from 27 cm long Ho3+-doped fiber. The maximum unsaturated power about 161 mW and corresponding slope efficiency up to 67.4%. influence of length 2.1 also investigated. Our results show that promising gain media for applications.

High flatness, wide bandwidth, and high-coherence properties of supercontinuum (SC) generation in fibers are crucial many applications. It is challenging to achieve SC spectra a combination the properties, since special dispersion profiles required, especially when pump pulses with duration over 100 fs employed. We propose an all-solid microstructured fiber composed only hexagonal glass elements. The optimized possesses ultraflat all-normal profile, covering wavelength interval approximately...