The HIS2000R-CWC300 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. The gold-plated reflector captures rear-hemisphere radiation and directs it forward into the Winston cone input aperture, recovering emission that would otherwise be absorbed by the package walls.

The Winston cone geometry — derived from the edge-ray principle of non-imaging optics — collects radiation over its defined acceptance half-angle and redirects it into a narrower output cone with near-ideal étendue efficiency. The cone is a purely reflective element; it introduces no wavelength-dependent loss or spectral filtering within the 2–11 µm transmission band of the CaF₂ window. The 725 mW output figure represents total power transmitted through the CaF₂ window and delivered into the Winston cone output beam.

The soldered CaF₂ window transmits efficiently across 2–11 µm. The nitrogen fill eliminates internal oxygen and moisture from the time of manufacture, protecting the filament and the inner window surface from long-term degradation. Pulsed modulation at up to 4 Hz supports synchronous lock-in detection, suppressing thermal background and 1/f noise for stable, low-drift measurements in field-deployed instruments.

Three Enabling Technologies in a Single Package

The HIS2000R-CWC300 is the only model in the HIS2000R family that combines Winston cone beam shaping, a hermetically sealed window, and mid-IR spectral coverage to 11 µm simultaneously. The HIS2000R-0WC provides Winston cone output with full 2–20 µm access, but no environmental sealing. The sealed HIS2000R series (A300, C300) provide hermetic protection with high output, but without beam shaping. The HIS2000R-CWC300 addresses all three requirements together, for applications where coupling efficiency, spectral range, and deployment environment all impose constraints simultaneously.

Winston Cone: Maximum Coupling Efficiency into Small Apertures Across 2–11 µm

The Winston cone concentrates output into a defined, low-divergence beam using the edge-ray principle of non-imaging optics, without introducing wavelength-dependent loss within the 2–11 µm transmission range of the CaF₂ window. This is particularly valuable for fibre-coupled systems, small-aperture gas cells, and compact detector assemblies where a significant fraction of the open-reflector emitter’s output would otherwise miss the acceptance aperture. The combination of the 40 mm² element’s high étendue and the Winston cone’s near-ideal throughput efficiency ensures that a high fraction of the filament’s total radiated power in the 2–11 µm band is delivered to the downstream optical system.

Soldered CaF₂ Window: Maximum Seal Integrity for CaF₂

CaF₂ windows are most commonly bonded to metal packages using adhesive or epoxy. The HIS2000R-CWC300 uses a soldered CaF₂ window, which requires metallisation of the crystal surface and a matched solder alloy, but produces a hermetic metal-to-ceramic bond that maintains seal integrity through repeated thermal cycling and mechanical stress that adhesive bonds cannot consistently withstand. For a hygroscopic material like CaF₂, maintaining hermetic seal integrity over a multi-year service life is critical: any ingress of moisture degrades the CaF₂ inner surface and reduces transmission. The soldered construction eliminates this failure mode.

2–11 µm Spectral Coverage for Broadband Gas Detection

The 2–11 µm band covers both the primary NDIR detection wavelengths (CO₂ at 4.26 µm, CO at 4.67 µm, CH₄ at 3.31 µm, hydrocarbons at 3.0–3.5 µm) and the extended mid-infrared fingerprint region (SO₂ at ~7.3 and ~8.7 µm, NH₃ at ~8.5–11 µm, N₂O at ~7.8 µm, and organic compound bending modes), enabling a single emitter to serve multi-analyte instruments targeting both short- and long-wave absorbers.

Nitrogen Fill for Long-Term Window and Filament Protection

The nitrogen fill eliminates internal oxygen and moisture, preventing filament oxidation and protecting the inner CaF₂ surface from moisture-driven etching. For a soldered hermetic package, the nitrogen atmosphere is established at manufacture and maintained throughout the device’s service life without degradation, unlike adhesive-bonded packages where outgassing can gradually introduce reactive species into the internal atmosphere.

Large 40 mm² Element with Gold-Plated Reflector

The 40 mm² element provides high source étendue, which is necessary for the Winston cone to operate near its theoretical throughput limit. The gold reflector (>98% IR reflectivity) recovers rear-hemisphere emission, maximising the power available at the cone input aperture and ensuring the full benefit of the large element area is realised in the transmitted output beam.

Patented Nanostructured High-Emissivity Surface

Emissivity exceeding 0.9 across the emission band maximises radiant efficiency and produces a spectrally smooth, predictable output across 2–11 µm, simplifying bandpass filter design for multi-analyte detection and ensuring consistent output power across production units.

• Fibre-Coupled Mid-IR Gas Analysis: Systems using CaF₂ or chalcogenide fibres to deliver 2–11 µm infrared radiation to a remote measurement point, where the Winston cone’s beam shaping maximises coupling into the fibre numerical aperture and the hermetic sealed package enables long-term deployment in the field.
• High-Coupling NDIR Gas Sensing with Small Detector Apertures: Compact gas cells and miniaturised multi-analyte detectors targeting both short-wave (CO₂, CO, CH₄) and long-wave (SO₂, NH₃, N₂O, VOCs) absorbers in a single sealed instrument, where coupling efficiency into small photodetector areas is critical.
• Permanent Industrial Installation: Fixed-point gas analysers and process monitors in petrochemical, pharmaceutical, and industrial manufacturing environments requiring hermetically sealed construction for multi-year service without maintenance, with spectral coverage across the full 2–11 µm fingerprint region.
• Environmental and Emissions Monitoring: Outdoor CEMS and atmospheric analysers requiring sealed construction for permanent installation and broadband spectral access to SO₂, NH₃, N₂O, and other mid-IR absorbing species alongside standard greenhouse gases.
• Mid-IR Spectroscopy in Sealed Instruments: Process-line and field-portable spectrometers operating in the 2–11 µm fingerprint region, where hermetic sealing prevents atmospheric contamination of the optical path and the Winston cone improves throughput into the spectrometer entrance optics.
• Medical Gas Analysis: Multi-gas anaesthetic monitors and respiratory analysers requiring coverage of halogenated agent absorption features in the 8–11 µm region alongside CO₂ and N₂O, in instruments with hermetically sealed optical assemblies for clinical reliability.
• Scientific Research Instrumentation: Custom spectrometers, gas reference cells, and optical bench experiments requiring a stable, sealed, beam-shaped broadband source across the 2–11 µm molecular fingerprint region for long-duration measurements in controlled environments.

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 NDIR gas sensing, mid-IR spectroscopy, fibre-coupled systems, and industrial IR 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