Terahertz Diffractive Optical Element

Output Power: ≤200 mW Transverse Mode: Multimode Drive Mode: Analog Modulation, Digital Modulation, Computer Control

Diffractive optical elements (DOEs) are an emerging class of optics. Micro/nano-etching typically forms two-dimensional arrays of diffractive units with defined geometry and refractive index to control laser-wavefront phase precisely. Light diffracts at each unit and interferes at a distance, usually infinity or a lens focal plane, to create a specified intensity distribution. ELITE works with overseas DOE suppliers and offers customized elements. Sixteen patterns are available, including dot matrices and 3-, 5-, 7-, 11- and 81-line patterns.

Light-splitting element: Reflection diffraction grating Light-source system: Low-pressure mercury lamp (wavelength calibration) + broadband LED source (continuous spectrum) Output Wavelength: Continuously adjustable (covering the visible region)

The BEX-8518 diffraction-grating-based comprehensive photoelectric-effect apparatus was jointly developed by Boyuan Optoelectronics and Southeast University. It won first prize in the thirteenth self-made-instrument competition of the national university experimental-physics teaching research association and is a new-generation system for introductory university physics laboratories. Traditional experiments combine mercury-lamp lines with bandpass filters, providing only five discrete wavelengths: 365nm, 405nm, 436nm, 546nm, and 577 nm. Students cannot observe continuous spectral response. This apparatus uses a reflective diffraction-grating monochromator with a low-pressure mercury lamp and broadband LED source to provide continuously tunable monochromatic light. The mercury lamp calibrates wavelength; the broadband LED supplies a continuous spectrum, from which the grating selects any wavelength to illuminate the phototube. The controller acquires photocurrent and stopping voltage for Planck-constant determination, spectral-response studies, and current-voltage measurements, allowing wave-particle duality to be verified within one apparatus. All optics mount on a precision breadboard with an open, visible path, showing the complete collimation-dispersion-focusing structure. This overcomes the teaching limitations of enclosed monochromator black boxes and supports both verification experiments and design-oriented inquiry in general- and modern-physics teaching.

Topological Charge [Standard Options]: 1~64 Surface Profile Type: Refractive (Continuous Surface, Traditional Solid Form); Diffractive (Stepped Discrete Form) Diffraction Efficiency [Ideal Product]: Can Reach 90% or More

Definition: spiral phase plates, also called vortex phase plates, are phase-only field-control optics; the source calls transmissive designs '*** classic,' retaining masking. Optical thickness varies continuously or stepwise with azimuth θ, adding phase delay Δφ=ℓθ to directly generate optical vortices carrying orbital angular momentum; see schematic. Key parameters: 1. Operating wavelength spans UV, visible, near IR, and far IR, 193nm~10.6μm. 3. Surface types: (1) refractive, continuous traditional solid surfaces with monotonically increasing thickness around the center. Different thicknesses create path differences and azimuth-dependent delay without relying on diffraction. The thickness formula is absent; n denotes substrate index, n₀ air index, and λ operating wavelength. (2) Diffractive, discrete multilevel relief approximating continuous phase. Easier to manufacture, but wavelength-dependent. 4. Clear aperture, the transmitting phase-modulating region, supports custom circular/square sizes. 6. Substrates/coatings: fused silica, silicon, germanium, ZnSe; custom band-specific AR/laser-resistant coatings. Principles: 1. Basic modulation. A parallel Gaussian beam passes through varying spiral thicknesses, producing graded path differences. Transmitted phase increases with angle to form a spiral wavefront. 2. Phase singularity. Around one revolution, total phase changes by the topological-charge multiple of 2π. Central cancellation creates a zero-intensity dark singularity and the '*** final' hollow-ring vortex, retaining source masking. 3. Reconstructed output carries orbital angular momentum, converting an ordinary beam into vortex light, with beam rotation/conversion and annular energy redistribution for specialty control. Manufacturing/customization: the company describes itself as an early Chinese precision micro/nano-optics developer with years of R&D/industrial experience and a '******' Chinese enterprise to complete independent spiral-plate development and mass production, breaking an overseas monopoly, with the qualifier masked. Its engineers specialize in design, fabrication, and inspection, with extensive vortex-phase/DOE practice. Core specialists solved three bottleneck processes: three-dimensional spiral etching, precision spiral-figure calibration, and high-damage-threshold specialty coatings, enabling domestic independent production. An integrated in-house lithography line controls full development/manufacturing. Precision structures transform Gaussian input into high-quality vortex light, with regular uniform dark cores, very low phase distortion, and diffraction efficiency consistently above 90%, described as comparable with leading imports. Custom charges cover 1~64; spectra cover UV through near IR. High-purity fused silica is preferred for continuous high-power lasers, damage resistance, and stable operation under temperature/vibration. Silicon, germanium, and ZnSe options with custom AR/laser-resistant coatings meet varied systems. The team controls optical/vortex simulation, optimized structures, prototypes, industrial batches, and full outgoing inspection. Flexible orders serve nonstandard research prototypes/special structures and standardized high-volume equipment production. Relief accuracy, efficiency, vortex uniformity, and zero-order suppression are individually inspected, with complete reports available. Compared with imports, local lines shorten lead times, and dedicated optical engineers provide one-to-one support with claimed advantages in initial design, on-site setup, corrections, and parameter flexibility. Complete design/manufacturing/inspection services address vortex manipulation, field control, precision experiments, and laser equipment. Products are widely applied to micromanipulation, superresolution microscopy, orbital-angular-momentum communications, Hartmann sensing, and precision laser processing. Independent processes, micrometer figure accuracy, stable modulation, and lifecycle support have earned long-term strategic collaboration with research institutes, listed equipment firms, and leading laser companies. The company describes itself as one of few Chinese benchmark leaders controlling design through mass production, assuring technology, capacity, quality, and after-sales service. The following is the stock list; unlisted models are customizable with 3-4 week lead times. Page summary: also called spiral phase sheets, vortex optics, or Bessel amplitude-modulating spiral phase plates; English names Spiral Phase Plate or Vortex Phase-plate. Additional parameters: 2. Topological charge counts total phase cycles per revolution; typical 1~64. Higher charge gives larger rings and greater single-photon orbital angular momentum. 5. Ideal diffraction efficiency can exceed 90%. Image captions: schematic; interferometer test; output spot; focused output spot.

Topological Charge [Standard Options]: 1~64 Surface Profile Type: Refractive (Continuous Surface, Traditional Solid Form); Diffractive (Stepped Discrete Form) Diffraction Efficiency [Ideal Product]: Can Reach 90% or More

Definition: spiral phase plates, also called vortex phase plates, are phase-only field-control optics; the source calls transmissive designs '*** classic,' retaining masking. Optical thickness varies continuously or stepwise with azimuth θ, adding phase delay Δφ=ℓθ to directly generate optical vortices carrying orbital angular momentum; see schematic. Key parameters: 1. Operating wavelength spans UV, visible, near IR, and far IR, 193nm~10.6μm. 3. Surface types: (1) refractive, continuous traditional solid surfaces with monotonically increasing thickness around the center. Different thicknesses create path differences and azimuth-dependent delay without relying on diffraction. The thickness formula is absent; n denotes substrate index, n₀ air index, and λ operating wavelength. (2) Diffractive, discrete multilevel relief approximating continuous phase. Easier to manufacture, but wavelength-dependent. 4. Clear aperture, the transmitting phase-modulating region, supports custom circular/square sizes. 6. Substrates/coatings: fused silica, silicon, germanium, ZnSe; custom band-specific AR/laser-resistant coatings. Principles: 1. Basic modulation. A parallel Gaussian beam passes through varying spiral thicknesses, producing graded path differences. Transmitted phase increases with angle to form a spiral wavefront. 2. Phase singularity. Around one revolution, total phase changes by the topological-charge multiple of 2π. Central cancellation creates a zero-intensity dark singularity and the '*** final' hollow-ring vortex, retaining source masking. 3. Reconstructed output carries orbital angular momentum, converting an ordinary beam into vortex light, with beam rotation/conversion and annular energy redistribution for specialty control. Manufacturing/customization: the company describes itself as an early Chinese precision micro/nano-optics developer with years of R&D/industrial experience and a '******' Chinese enterprise to complete independent spiral-plate development and mass production, breaking an overseas monopoly, with the qualifier masked. Its engineers specialize in design, fabrication, and inspection, with extensive vortex-phase/DOE practice. Core specialists solved three bottleneck processes: three-dimensional spiral etching, precision spiral-figure calibration, and high-damage-threshold specialty coatings, enabling domestic independent production. An integrated in-house lithography line controls full development/manufacturing. Precision structures transform Gaussian input into high-quality vortex light, with regular uniform dark cores, very low phase distortion, and diffraction efficiency consistently above 90%, described as comparable with leading imports. Custom charges cover 1~64; spectra cover UV through near IR. High-purity fused silica is preferred for continuous high-power lasers, damage resistance, and stable operation under temperature/vibration. Silicon, germanium, and ZnSe options with custom AR/laser-resistant coatings meet varied systems. The team controls optical/vortex simulation, optimized structures, prototypes, industrial batches, and full outgoing inspection. Flexible orders serve nonstandard research prototypes/special structures and standardized high-volume equipment production. Relief accuracy, efficiency, vortex uniformity, and zero-order suppression are individually inspected, with complete reports available. Compared with imports, local lines shorten lead times, and dedicated optical engineers provide one-to-one support with claimed advantages in initial design, on-site setup, corrections, and parameter flexibility. Complete design/manufacturing/inspection services address vortex manipulation, field control, precision experiments, and laser equipment. Products are widely applied to micromanipulation, superresolution microscopy, orbital-angular-momentum communications, Hartmann sensing, and precision laser processing. Independent processes, micrometer figure accuracy, stable modulation, and lifecycle support have earned long-term strategic collaboration with research institutes, listed equipment firms, and leading laser companies. The company describes itself as one of few Chinese benchmark leaders controlling design through mass production, assuring technology, capacity, quality, and after-sales service. The following is the stock list; unlisted models are customizable with 3-4 week lead times. Page summary: also called spiral phase sheets, vortex optics, or Bessel amplitude-modulating spiral phase plates; English names Spiral Phase Plate or Vortex Phase-plate. Additional parameters: 2. Topological charge counts total phase cycles per revolution; typical 1~64. Higher charge gives larger rings and greater single-photon orbital angular momentum. 5. Ideal diffraction efficiency can exceed 90%. Image captions: schematic; interferometer test; output spot; focused output spot.