We generated tunable 2-μm optical vortex pulses with a topological charge of 1 or 2 in the wavelength range 1.953-2.158 μm by realizing anisotropic transfer from pump beam to signal output vortex-pumped half-symmetric parametric oscillator. A maximum energy 2.1 mJ was obtained at 22.8 mJ, which corresponds slope efficiency 15%. The charges and idler were investigated using shearing interferometric technique employing low-spatial-frequency transmission grating.

Abstract A new green-emitting phosphor, KAlSiO 4 :1.5 mol% Tb 3+ , x Li + was prepared via a high-temperature solid-phase method, and its crystal structure, diffuse reflectance spectrum, luminescence were studied. The results show that the doping shifts strongest diffraction peak to high angle direction, reducing grain size by 11.4%. entry of 2 CO 3 improves performance . At concentration 1.5 mol%, sample has strong absorption in ultraviolet light range from 250 400 nm. luminous intensity at...

Abstract This work report the generation of high‐order Laguerre–Gaussian (LG) modes from a nanosecond, optical vortex pumped diamond Raman laser. system is capable generating first‐Stokes ( λ 1st = 1240 nm) LG with topological charge (ℓ) up to 26 and second‐Stokes 2nd 1485 22, when using first‐order beam. The maximum first‐ mode energies are measured be 0.5 1 mJ, respectively, pumping energy 19.8 mJ.

We propose a method for the selective generation of high-order orbital angular momentum (OAM) modes by twisting ring-core fiber (RCF). Theoretically, 22 OAM can be generated in twisted RCF with effective mode separation. experimentally demonstrate excitation up to fourth order. The positive or negative topological charge is determined clockwise counterclockwise twist direction, indicating that helical phase controlled orientation. Compared other fiber-based methods, our approach have...

We report on the generation of an off-axis vortex with tunable non-integer orbital angular momentum (OAM), generated using idler-resonant mid-infrared optical parametric oscillator (OPO) based KTiOAsO4. The design OPO enables OAM signal and idler outputs to be varied from 0 1 through precise adjustment cavity length. maximum output energies at 1.5 3.5 μm were 1.95 1.1 mJ, respectively, obtained a pump energy 20 mJ. means by which was shared between fields theoretically examined modeling...

We present a high beam quality, mid-infrared, wavelength tunable, idler-resonant optical vortex parametric oscillator based on single-grating MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal. The compact, plane-concave cavity used in this work enabled transfer of the orbital angular momentum (OAM) pump field to idler field, deliver mid-infrared emission with measured M2 factors 2.2 both orthogonal directions. wavelengths signal (which had TEM00/Gaussian-like spatial profile)...

We present the first handedness control of an optical vortex output from a vortex-pumped parametric oscillator. The was identical to that pump beam. Over 2 mJ, 2-μm with topological charge ± 1 achieved. found fractional half integer can also be selectively controlled.

We demonstrated a widely tunable 1-μm optical vortex laser formed from 0.532-μm pumpedoptical parametric oscillator with singly-resonant cavity configuration employing cascaded non-critical phase-matching LiB₃O₅ crystals. With this system, the topological charge of pump beam can be selectively transferred to signal or idler output, and output in wavelength range 850-990 nmor 1130-1300 nm could obtained.A maximum energy 0.9 mJ was achieved, corresponding an efficiency 10%.

We present what is to our knowledge the first demonstration of handedness control a midinfrared (6.0–12.5 μm) vortex output from 1 μm vortex-pumped optical parametric oscillator by swapping frequencies signal and idler outputs. Right- left-handed outputs over 0.1 mJ were generated within frequency range 6.0–11.0 μm. Such tunable laser with selectivity will open door chiral organic materials processing.

Abstract In this study, Tb 3+ —doped natural sodium feldspar (NaAlSi 3 O 8 ) phosphors have been successfully prepared using high−temperature solid—state method with as a substrate. Energy—dispersive X—ray spectrometry analysis (EDX) of NaAlSi showed that 0.03 wt% Eu element was present, and elemental distribution mapping the trace in minerals aggregated. The crystal structure luminescence properties Eu—containing synthetic :Eu , are discussed detail. samples Na + matrix partly replaced by...

We developed an octave-band tunable optical vortex laser based on a 532 nm pumped parametric oscillator with simple linear-cavity configuration by employing cascaded non-critical phase-matching LiB3O5 crystals. The output was from 735 to 1903 nm. For pump energy of 9 mJ, pulse 0.24-2.36 mJ obtained, corresponding optical-optical efficiency 0.3-26%.

Abstract We investigated high energy, near and mid-infrared optical vortex lasers formed by a 1 μm vortex-pumped KTiOAsO 4 (KTA) parametric oscillator. The orbital angular momentum (OAM) of the pump beam can be selectively transferred to signal or idler output changing reflectivity coupler. With this system, 1.535 µm with an energy 2.04 mJ 3.468 1.75 were obtained maximum 21 mJ, corresponding slope efficiencies 14% 10%, respectively. spectral bandwidth (full width at half maximum, FWHM)...

We present a high-power, widely tunable, synchronously pumped picosecond pulsed optical parametric oscillator (OPO) generating emissions in the near to mid-infrared wavelength ranges. The OPO is using Nd:YVO4 laser and utilizes fan-shaped, multi-grating MgO doped PPLN crystal (MgO:PPLN). system generates output across range 1.3–5 µm, with high overall conversion efficiency of 75.15%.

The generation of near- and mid-infrared vortex mode is demonstrated from a 1 µm nanosecond optical pumped parametric oscillator using multi-grating MgO-doped periodically poled lithium niobate crystal with five grating domains. This system enables the orbital angular momentum between signal idler outputs to be exchanged simply by controlling cavity Q-factor, output in wavelength ranges 1.36–1.63 or 3.07–4.81 could obtained. A maximum (idler) energy 4.3 mJ (2.2 mJ) was achieved at pump 21...

State preparation via postselected weak measurements in a three-wave mixing process is studied. We assume the signal input mode prepared vacuum state, coherent or squeezed while idler state and passes medium characterized by second-order nonlinear susceptibility. It shown that when single photon detected at one of output channels beam's path, channel single-photon Fock single-photon-added with very high fidelity, depending upon states related controllable parameters. The properties...

Silica optical fiber derived from yttrium-aluminum-garnet (YAG) crystals is an excellent high-gain due to their high rare earth ions doping concentration. It offers a new opportunity of addressing the constraints on optical-to-optical conversion efficiency and output power in silica gain fiber-based linearly polarized single-frequency lasers (LPSFFLs). Here, we fabricated 6.57 wt.% Yb: YAG crystal-derived (YCDSF) with coefficient 6.0 dB/cm at 1030 nm. Using 0.8-cm-long YCDSF, stable LPSFFL...

In this paper, we present a picosecond pulsed, synchronously pumped optical parametric oscillator producing vortex beam output with tunable wavelengths in the near- to mid-infrared range. The system utilizes Nd:YVO4 pulsed solid-state laser emitting at wavelength of 1.064 µm pump Z-shaped, singly resonant OPO which contains MgO:PPLN crystal fan-shaped grating. tuning characteristics are examined both as function grating period and temperature. orbital angular momentum field can be...

High-order Laguerre–Gaussian (LG) petal-like beams have become a topic of significant interest due to their potential application in next-generation optical trapping, quantum optics, and materials processing technologies. In this work, we demonstrate the generation high-order LG with spatial profiles tunable orbital angular momentum (OAM) mid-infrared wavelength region. These are generated using idler-resonant parametric oscillation (OPO) KTiOAsO4 (KTA) crystal. By adjusting length resonant...