Dissipative Kerr soliton (DKS) frequency combs - also known as microcombs have arguably created a new field in cavity nonlinear photonics, with strong cross-fertilization between theoretical, experimental, and technological research. Spatiotemporal mode-locking (STML) not only add degrees of freedom to ultrafast laser technology, but provide insights for implementing analogue computers heuristic optimizers photonics. Here, we combine the principles DKS STML first time demonstrate by...

Optical frequency combs in microresonators (microcombs) have a wide range of applications science and technology, due to its compact size access considerably larger comb spacing. Despite recent successes, the problems self-starting, high mode efficiency as well output power not been fully addressed for conventional soliton microcombs. Recent demonstration laser cavity microcombs by nesting microresonator into fiber cavity, shows great potential solve problems. Here we study dissipative...

A grating coupler on 700-nm-thick Z-cut lithium-niobate-on-insulator platform with high coupling efficiency, large bandwidth, and fabrication tolerance is designed optimized by inverse design method. The fabricated a single set of e-beam lithography etching process, it experimentally characterized to possess peak efficiency −3.8 dB at 1574.93 nm, 1 bandwidth 71.7 3 over 120 respectively.

Abstract Dissipative Kerr soliton (DKS) microcomb has emerged as an enabling technology that revolutionizes a wide range of applications in both basic science and technological innovation. Reliable turnkey operation with sub-optical-cycle sub-femtosecond timing jitter is key to the success many intriguing at intersection ultrafast optics microwave electronics. Here we propose approach demonstrate first Brillouin-DKS frequency comb best our knowledge. Our microresonator-filtered laser design...

Purpose To investigate the feasibility of proton therapy planning using stopping power ratio (SPR) maps directly generated from spectral CT raw data, and to perform a comparative evaluation dose calculation uncertainties between SPR derived conventional Hounsfield Unit (HU) conversion direct generation. Materials methods A retrospective analysis was conducted on 30 patients with mid-thoracic esophageal squamous cell carcinoma (ESCC) who underwent pre-treatment imaging. Target volumes organs...

We first demonstrate the laser performance of a compact 2.06 μm Ho: YLF resonantly pumped by broadband fiber-coupled diode. In continuous-wave (CW) operation, maximum output power 1.63 W, corresponding to slope efficiency 89.2%, was obtained with near diffraction-limited beam quality. actively Q-switched pulse energy 1.1 mJ achieved at repetition frequency 100 Hz. The minimum duration 43 ns. in both CW and regimes indicates that current diode in-band has great potential certain conditions...

Magneto-optical (MO) polymer nanocomposites have emerged as alternatives to conventional MO crystals, particularly in nanophotonics applications, thanks their better processing flexibility and superior Verdet constants. However, a higher constant commonly comes with excessive optical loss due increased absorption scattering, resulting or reduced figure-of-merit (FOM) defined the over loss. By doping magnetite (Fe

In this paper, the theoretical quantitative energy-level character and experimental laser performance of resonantly fiber-coupled diode-pumped Ho <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> : YLiF <sub xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> (Ho: YLF) are first presented. More precise 2.7-level Ho: YLF can be acquired with our analysis. With study, a maximum slope efficiency 88.5%, corresponding to an output power 1.85 W,...

By identifying the similarities between coupled-wave equations and parametrically driven nonlinear Schr\"odinger equation, we show existence conditions of quadratic solitons in continuous-wave pumped singly resonant degenerate optical parametric oscillators (SRDOPOs). Compared to previously explored doubly DOPOs, SRDOPOs are advantageous their robustness against perturbations induced by dispersion effective third-order nonlinearity temporal walk-off signal pump. Terahertz comb bandwidth...

Abstract We theoretically study the nature of parametrically driven dissipative Kerr soliton (PD-DKS) in a doubly resonant degenerate micro-optical parametric oscillator (DR-DμOPO) with cooperation χ (2) and (3) nonlinearities. Lifting assumption close-to-zero group velocity mismatch (GVM) that requires extensive dispersion engineering, we show there is threshold GVM above which single PD-DKS DR-DμOPO can be generated deterministically. find exact generation dynamics divided into two...

We demonstrated the active shaping for a solid-state Nd:YVO4 amplifier with high average gain of 39.2 dB. The output power was 8.3 W respect to input 1 mW. A range common and useful pulse shapes generated at final output. In addition, very flat square produced root-mean-square less than 3% in amplitude. numerical method proposed realize without an experimental test amplifier, showing great potential design lasers both peak (>100 kW) desired shape.

The 30 at.% Ho: BaY2F8 crystals were grown by the Czochralski method, and their spectroscopic properties are analyzed systematically standard Judd–Ofelt theory. intensity parameters estimated to be Ω2 = 6.74 × 10−20 cm2, Ω4 1.20 Ω6 0.66 fluorescence branching ratios radiative lifetimes for a series of excited state manifolds also determined. emission cross sections with our measured infrared luminescence spectra, especially important 4.1 μm, calculated about 4.37 10−21 cm2. crystal quality...

In this paper, factors influencing the performance of high-gain Nd:YVO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> amplifiers are analyzed and a schematic map relationships between different is given. A model, including pump absorption saturation effect overlap efficiency along beam propagation direction, as well non-radiative decays due to high doping concentration, developed. The laser amplifier studied by changing quality, focal...

In this paper, we compare pulse parameters in two end-pumped passively Q-switched lasers by increasing the boundary temperature of laser crystal. For Nd:YAG/Cr:YAG laser, energy at 1 kHz increased from 12.4 to 21 μJ when 20°C 120°C, while width decreased 1.2 times. Nd:YVO4 using Cr:YAG as saturable absorber, 100 Hz 5.45 24.5 26°C 113°C, 2.4 An improved model based on rate equations was introduced analyze large variation heating

We examine the existence condition of quadratic soliton mode-locked degenerate optical parametric oscillator in previously unexplored parameter space. study nature solitons and divide their dynamics into two distinctive branches, depending on system parameters. Origin perturbation is identified, strategy to mitigate its detrimental effect developed. Frequency comb with terahertz bandwidth femtosecond pulse duration are attainable an example periodically poled lithium niobate waveguide...

We present the first design and analysis of a solid-state Mamyshev oscillator. utilize phase-mismatched cascaded quadratic nonlinear process in periodically poled lithium niobate waveguide to generate substantial spectral broadening for mode locking. The extensive bridges two narrowband gain media arms same cavity, leading broadband locking not attainable with either medium alone. Two pulses are coupled out each output carries pulse energy 25.3&#x00A0;nJ at repetition rate 100&#x00A0;MHz....

In this paper, a wavelength-locked 878.6-nm pumped acoustic-optically Q-switched Nd:YVO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> laser is presented. A master oscillator power amplifier configuration with two-stage amplifiers employed to scale the output power. Both and are directly by diode, reducing thermal load of crystal. The maximal 120.8 W at repetition rate 100 kHz, M <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>...

Abstract Dissipative Kerr soliton (DKS) microcomb has emerged as an enabling technology that revolutionizes a wide range of applications in both basic science and technological innovation. Reliable turnkey operation with sub-optical-cycle sub-femtosecond timing jitter is key to the success many intriguing at intersection ultrafast optics microwave electronics. Here we propose novel approach demonstrate first Brillouin-DKS frequency comb. Our Chimera cavity offers essential benefits are not...

We present a compact high-power 780 nm frequency-stabilized diode laser with power of as high 2.825 W, corresponding to an estimated overall efficiency 38.5%. The tapered amplifier (TPA) gain was about 24.5 dB, which basically consistent the simulation results. beam quality factor M2<1.72. core feature system stabilizing frequency narrowband semiconductor TPA matured saturated absorption spectrum technique. stabilized against mode hops for period >4200 s fluctuation around 6.7×10-10 within 1...

In this paper, the performance of an end-pumped laser amplifier was experimentally studied by adjusting pumping wavelength a diode. An interesting phenomenon observed: that gain would decrease with increase in absorbed pump power. The scaled output power 0.3 at. % doped 20 mm long Nd:YVO4 crystal decreased from 0.48 to 0.2 W when increased 17.5 17.8 W. Theoretical analysis demonstrated according our previous model. length is main reason for observed phenomenon. This could be utilized enhance...

We first demonstrate the laser performance of a compact 2.06-μm Ho: YLF wing pumped by fiber-coupled diode, which is insensitive to polarization state pump source. A maximum output power 1.44 W, corresponding slope efficiency 41.25%, obtained. The optimized beam quality factor reaches 2.52 when about 1 W. Multi-peak spectra are observed in range 2064.5-2066.6 nm. fluctuation greatly reduced 0.57% average 50 min. degree level 96%. stability and overall structure indicates that diode...