The HIS2000R-0WC operates as a resistive thermal emitter. Electrical current through the 40 mm² NiCr filament raises its temperature to approximately 630 °C; the nanostructured surface (emissivity >0.9) radiates energy across a broad Planck-governed spectrum spanning 2–20 µm. The gold-plated reflector captures rear-hemisphere emission and redirects it forward into the Winston cone input aperture, recovering energy that would otherwise be absorbed by the TO-8 package walls.

The Winston cone geometry is computed from the edge-ray principle: every ray entering at the maximum acceptance half-angle exits within the output half-angle, and every ray entering outside the acceptance angle is rejected. The cone profile achieves this without any intermediate imaging step, preserving throughput (étendue) up to the theoretical limit for the chosen acceptance and output angles. In practice, near-ideal étendue conservation means that almost all power entering the cone is delivered into the output beam — the marginal reduction from 1 W (HIS2000R-0) to 830 mW reflects the small absorption loss of the cone interior surface and the geometric rejection of rays outside the acceptance angle.

The open-window configuration imposes no spectral filtering: the Winston cone is a purely reflective element with no wavelength-dependent transmission properties, and there is no substrate in the optical path. Pulsed modulation at up to 4 Hz supports synchronous lock-in detection in NDIR systems, suppressing thermal background and 1/f noise to improve signal-to-noise ratio and long-term measurement stability.

Winston Cone: Wavelength-Independent Beam Shaping Across 2–20 µm

The Winston cone is the defining feature of the HIS2000R-0WC, and its reflective, non-imaging construction is particularly well-matched to broadband infrared applications. Refractive optics (lenses, windows) impose wavelength-dependent refraction and absorption loss; diffraction gratings introduce chromatic dispersion. A Winston cone operates purely by reflection, introducing no wavelength-dependent loss or beam deviation across the entire 2–20 µm range. This makes it the only beam-shaping option that preserves the full spectral bandwidth of the HIS2000R-0 without compromise. In contrast, the HIS550R-0WC (which also uses a Winston cone) covers the same spectral range at 190 mW; the HIS2000R-0WC provides more than 4× that output within the same defined beam geometry.

830 mW Within a Defined Output Cone Angle

The 830 mW specification represents total power delivered into the output cone of the Winston concentrator from the 40 mm² element and gold reflector combination. The marginal reduction versus the HIS2000R-0 (1 W) reflects cone absorption and geometric rejection losses; within the defined output solid angle, the power density per unit solid angle is substantially higher than the open-reflector HIS2000R-0, because the cone concentrates the output into a narrower beam. For applications where the detector or optical system acceptance aperture is smaller than the output cone solid angle, the HIS2000R-0WC delivers more usable power than the HIS2000R-0 despite its lower total output number.

Large 40 mm² Element with Gold-Plated Reflector

The 40 mm² filament provides the high source étendue necessary to fill the Winston cone input aperture efficiently. Gold maintains >98% reflectivity across the 2–20 µm band without oxidation, recovering rear-hemisphere emission that would otherwise be absorbed by the package walls and directing it into the cone input, where it contributes to the collimated output beam.

Full 2–20 µm Spectral Access

The open-window, purely reflective optical path provides unobstructed access to the full 2–20 µm range. No window material imposes a spectral cut-off, and the Winston cone introduces no wavelength-dependent transmission loss. This makes the HIS2000R-0WC suitable for any target gas or spectroscopy application within the mid-infrared, including long-wave species (refrigerants, heavy hydrocarbons, complex organics) whose absorption features lie beyond 14 µm.

Patented Nanostructured High-Emissivity Surface

Emissivity exceeding 0.9 ensures near-blackbody spectral behaviour, maximising the conversion of electrical power into radiant flux and producing a spectrally smooth output that closely follows the Planck curve at 630 °C. This simplifies filter selection and system calibration across the full 2–20 µm operating band.

Robust TO-8 Industrial Package

The TO-8 package provides greater thermal mass, improved heat dissipation at 2.5 W drive power, and a wider flange for secure mechanical mounting compared to the TO-39 platform. It is a well-established platform in high-power optoelectronics with standardised mounting hardware and connector options. The open package construction means the Winston cone cap forms the optical aperture of the assembly; external environmental protection is provided at the instrument level.

Pulsed Operation up to 4 Hz

The 4 Hz modulation limit reflects the thermal mass of the 40 mm² element. Within this bandwidth, pulsed operation enables synchronous detection architectures that reject broadband thermal background, 1/f noise, and slow detector drift, significantly improving measurement signal-to-noise ratio in long-path and precision instruments.

• Small-Aperture NDIR Gas Detection: Long-path gas cells and detector assemblies with small acceptance apertures, where the Winston cone’s beam concentration delivers substantially more power into the detector active area than the open-reflector HIS2000R-0 can achieve at the same total output level.
• Fibre-Coupled Mid-IR Spectroscopy Across 2–20 µm: Infrared fibre-coupled instruments and remote-sensing probes where efficient coupling into the fibre numerical aperture is critical; the Winston cone concentrates output into a cone matched to the fibre acceptance angle without spectral filtering across the full 2–20 µm range.
• Miniaturised Multipass Gas Cells: Herriott and White cell configurations with small injection apertures, where reduced beam divergence enables efficient re-injection on each pass and maximises effective optical path length without optical realignment.
• High-Power FTIR and Dispersive IR Spectroscopy: Benchtop and process FTIR instruments, dispersive IR analysers, and custom spectrometers requiring both maximum source radiance across 2–20 µm and controlled beam geometry for efficient coupling into spectrometer entrance slits or integrating sphere ports.
• Industrial Process Gas Analysis and CEMS: High-accuracy process gas monitors and stack emission analysers targeting multiple species across the full mid-infrared, where both output power and beam geometry control are required for consistent performance across varying optical alignment conditions.
• Automotive and Engine Exhaust Analysis: Multi-band exhaust gas analysers measuring CO, CO₂, HC, NOx, and long-wave species simultaneously, where the combination of high power and beam concentration improves signal consistency across the wide spectral range.

Scientific Research and Custom Instrumentation: University and national laboratory research instruments, optical bench experiments, and custom spectrometers requiring the highest available broadband output with controlled beam geometry across the full 2–20 µm mid-infrared range.

United Spectrum Instruments (USI) is a specialist distributor and application partner for advanced photonics, infrared sensing, and scientific instrumentation in India. USI combines access to globally leading component technologies with deep domain expertise, supporting customers from initial product selection through OEM system integration and volume production supply.

Key reasons to work with United Spectrum Instruments:

• Access to internationally leading infrared emitter and photonics technologies
• Expert application support for high-power NDIR gas sensing, FTIR, fibre-coupled spectroscopy, and industrial IR system design
• OEM consultation covering component selection, optical system design, thermal management, and production ramp
• Reliable supply for evaluation samples and production quantities
• Established partnerships with leading international photonics manufacturers
• Fast, responsive technical communication and application-focused engineering guidance