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Scaling down semiconductor lasers in all three dimensions hold the key to the developments of compact, low-threshold, and ultrafast coherent light sources, as well as photonic integrated circuits. However, the minimum size of conventional semiconductor lasers utilizing dielectric cavity resonators (photonic cavities) is limited by the diffraction limit. Recently, it has been proposed and experimentally...
Ultrashort pulse (USP) fiber lasers have become one of the most important instruments in various fields of science and industry during two past decades [1]. A number of applications requires stability of pulse duration, repetition rate and low intensity noise of an USP source. For example, stabilization of this parameters is in great demand in frequency metrology field, dual comb spectroscopy, THz...
Miniature light sources are desirable for integrated photonic devices. Dielectric crystals with diverse structures and functions are important media for various photonic and optical applications. Laser crystals serve as gain media for solid state laser systems, which have been applied for generation of wavelength bands from visible till mid-infrared. Direct processing of dielectric crystals by “physical”...
The interaction between the excitonic J-band of J-aggregate molecules and localized plasmonic resonances supported by metallic structures can be large enough to reach the regime of strong coupling, giving rise to two hybridized modes [1, 2]. The new hybrid system is often characterized in extinction measurements, where the strong coupling results in an avoided crossing of the two modes as the detuning...
We achieved four types of laser emissions with quantum dots (QDs) using the same high-Q-factor optofluidic ring resonator (OFRR) platform. In the first type, 2 µM QDs dissolved in toluene that filled the entire OFRR cavity volume were employed as the gain medium. The lasing threshold was 15–22 µJ/mm2. In the second type, 2 µM aqueous QDs were in bulk buffer solution that filled the entire OFRR cavity...
Manipulating large numbers of a variety of particles/wires is essential for many lab-on-a-chip technologies. Here we generate a planar array of optofluidic vortices with photothermal gradients from an easy-fabricated graphene oxide (GO) heater to achieve high-throughput and multiform manipulation at low excitation power and low loss. As a tweezer, each vortex can rapidly capture and confine particles...
Development of high power laser systems is limited by the problem of optical materials overheating by laser radiation. For optical absorptance testing laser calorimetry [1] is widely used. Its main part is temperature kinetics measurement of the sample exposed to laser radiation. Temperature is measured mostly by indirect methods with sensors adjusted to sample surface. However, absorption of scattered...
Ultra-short pulse (USP) fiber lasers have a great potential for their applications in various fields of science, industry and technology [1]. We have implemented MOPA (Master Oscillator Power Amplifier) configuration. Master oscillator (MO) is ring all-fiber laser with 92.6 fs parabolic spectra dechirped pulses at a central wavelength of 1560nm with 11.2mW average output power and 38.2MHz repetition...
Time-reversal symmetry is ubiquitous in physics; it allows a physical process to reverse in a backward direction of time. The study of time symmetry in optics has been attracting increasing attention, since they provide alternative and substantial ways to manipulate light. Recently, it has been theoretically and experimentally demonstrated that a time-reversed process of laser emission, or coherent...
Research in the field of laser atmospheric propagation has been continued for many years. Due to the atmospheric turbulence, the actual systems are facing a lot of technical problems. It leads to the difficulty of large-scale civilian use of laser communication. In this paper, the parameters of a laser transmission experiment are analyzed. The study of laser atmospheric propagation is usually based...
Hybrid plasmonic lasers in nanowires of small size have been intensively studied in the past few years. However, there is a condition, which is that the size of the nanowire should be small enough (diameter ∼ 100 nm) to suppress the lasing of the photonic modes. Because the photonic modes suffer less loss, leading to lower threshold. Thus for large-size nanowires, it is hard to achieve the lasing...
Intense ultrashort pulse laser has been widely used for the ultrafast phenomena in solid states and the non-thermal laser processing. In such highly nonlinear and fast processes, new theoretical approach, real-time description including nonlinear and/or non-perturbative, is indispensable.
Stimulated by the non-Hermitian nature of micro- and nanophotonic systems, modal interaction has been proposed to play a more essential role in controlling lasing actions. Here we demonstrate its impact on mode management in microcavity lasers. Single-mode laser emission with extinction ratio above 10 dB has been obtained in twin-microdisks with a radius about 40 µm. Unlike conventional single-mode...
Since the first realization of ruby laser in 1960s, the rapidly developed laser technology plays significant roles in modern research, industry as well as military. The cavity, which is the main component of a laser, attracts enormous research interests due to the variety of configurations and abundant applications in bio/chemical sensing, optical filters/switches, quantum information processing and...
Chirality is a kind of important phenomenon around the exceptional point. The chirality of long-lived resonance has been theoretical studied and has shown promising potentials in nanoparticle sensing and rotation sensing. However, the researches on chirality are mostly limited in theoretical studies. The experimental demonstrations are quire challenging, especially in low refractive index microcavities...
Among a variety of techniques for broadband access, the infrastructure based on Passive Optical Network (PON) is one of the most viable solutions. In 10- and 40-Gigabit capable PON, the downstream wavelength in optical line terminals (OLTs) has been set in L-band. The electroabsorption modulated laser (EML) is a popular lasing source in such PONs due to its low chirp and high modulation speed. However,...
Black phosphorus (BP) as a novel class of two-dimension (2D) materials has recently attracted large amount of attention as a result of its unique physical and chemical features. The remarkably strong light-matter interaction and tunable direct band-gap at a wide range make it an ideal candidate especially in the mid-infrared wavelength region as the saturable absorber (SA). Here the simple and effective...
Pulsed fiber lasers with wideband operation in the mid-infrared (mid-IR) wavelength regime (2 ∼ 5 µm) have aroused considerable attentions for their potential applications in defense, laser microsurgery, mid-infrared spectroscopy, and nonlinear applications. Among the generation methods, high concentration Er3+-doped ZBLAN fiber lasers have become one of the most promising candidates to generate mid-IR...
We introduce composite two-dimensional optical lattices representing a superposition of two mutually rotated square patterns and allowing observation of continuous transformation between aperiodic and completely periodic optical lattices upon variation of the rotation angle θ. A remarkable property of this lattice is that it acquires periodicity only for specific rotation angles cos θ = b/c, sin θ...
Laser absorption spectroscopy is a powerful and versatile chemical analysis tool for the identification and quantification of molecular constituents, which offers the advantages that include fast response, high sensitivity, realtime, in situ and non contact measurements of species without any sample preparation. Therefore, it was widely used in siening of atmosphere or environment monitoring. In this...
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