Avantes Avalight-DH-S-BAL Balanced Deuterium-Halogen Light Source

Overview

The Avantes Avalight-DH-S-BAL is an engineered broadband light source designed to deliver a spectrally balanced, high-stability output across the ultraviolet, visible, and near-infrared spectral regions—from 215 nm to 2500 nm. Unlike conventional deuterium-halogen hybrid sources, which exhibit a pronounced emission peak at 656 nm (hydrogen alpha line) due to inherent deuterium lamp physics, the Avalight-DH-S-BAL incorporates a precision dichroic filter that selectively attenuates this feature by >95%. This spectral balancing eliminates photometric artifacts in absorbance, reflectance, and transmittance measurements—particularly critical in dual-beam spectrophotometry, reference-based calibration, and quantitative spectroscopic analysis where dynamic range and baseline fidelity are paramount. The source operates two independently controlled lamps: a high-intensity deuterium arc lamp for deep-UV stability and a stabilized tungsten-halogen filament for smooth continuum emission beyond 500 nm. Both lamps are thermally isolated and actively temperature-regulated to minimize thermal drift and ensure long-term radiometric consistency.

Key Features

• Spectrally balanced output via integrated dichroic filter—reduces 656 nm alpha peak without compromising broadband continuity
• Extended dynamic range: up to 20× improvement over non-balanced DH sources, enabling high-resolution detection of weak absorption features adjacent to strong bands
• Integrated TTL-controlled mechanical shutter (compatible with Avantes AvaSpec spectrometers and AvaSoft-FULL software) for synchronized dark-reference acquisition and duty-cycle optimization
• Adjustable-focus SMA905 coupling optics optimized for high-efficiency fiber coupling—supports core diameters from 200 µm to 600 µm with minimal modal dispersion
• Dedicated UV-grade optical path and SR-series fiber compatibility ensures negligible solarization-induced degradation below 250 nm
• Modular 50 × 50 × 5 mm filter holder enables in-line spectral shaping (e.g., order-sorting, bandpass selection, or ND attenuation) without realignment
• Low-noise power supply with active current regulation: intensity noise ≤ 2 × 10⁻⁵ AU (D₂) and ≤ 10⁻⁴ AU (halogen); long-term drift < ±0.5 %/hr (D₂) and < ±0.1 %/hr (halogen)

Sample Compatibility & Compliance

The Avalight-DH-S-BAL is compatible with standard optical bench configurations, integrating seamlessly into UV-Vis-NIR spectrophotometers, ellipsometers, and custom optical metrology setups. Its stable, artifact-free output meets requirements for ASTM E275 (Standard Practice for Describing and Measuring Performance of UV-Vis-NIR Spectrophotometers), ISO 9001 traceable calibration workflows, and GLP-compliant analytical laboratories. When used with Avantes’ IC-DB26-2 interface cable and AvaSoft-FULL v8.12+, the system supports automated dark-background subtraction with timestamped audit trails—facilitating compliance with FDA 21 CFR Part 11 for electronic records and signatures. No hazardous materials are present; RoHS and CE directives are fully satisfied.

Software & Data Management

Control and synchronization are achieved via TTL-level digital I/O, directly interfaced with Avantes spectrometers and supported by AvaSoft-FULL’s scripting engine. Users can define shutter open/close timing relative to integration start, trigger dark acquisitions automatically before each sample scan, and store metadata—including lamp hours, thermal status, and filter configuration—in .ASD spectral file headers. Raw intensity logs (sampled at 10 Hz) are exportable as CSV for post-acquisition drift correction. Firmware updates are delivered via Avantes’ secure firmware portal, with version history and release notes archived for quality assurance documentation.

Applications

• High-fidelity UV-Vis-NIR absorbance quantification in pharmaceutical QC (e.g., USP spectrophotometric assay validation)
• Baseline-critical reflectance measurements of thin-film coatings and semiconductor wafers
• Reference-grade calibration of array detectors and monochromator-based systems
• In-situ monitoring of chemical reaction kinetics where spectral interference from Hα must be excluded
• Development and validation of multivariate calibration models (e.g., PLS regression) requiring wide dynamic range and low spectral noise
• Optical coherence tomography (OCT) system characterization requiring broad, smooth spectral density

FAQ

What is the purpose of the dichroic filter in the Avalight-DH-S-BAL?
It selectively attenuates the intense hydrogen alpha emission at 656 nm generated by the deuterium lamp, eliminating spectral distortion and improving dynamic range for quantitative applications.
Can the Avalight-DH-S-BAL be operated with non-Avantes spectrometers?
Yes—the TTL shutter and analog monitor outputs are electrically standardized; external control requires a 5 V TTL-compatible signal generator and proper grounding isolation.
Is UV-grade fiber mandatory?
For operation below 250 nm, SR-grade (solarization-resistant) fused silica fiber is required to maintain transmission integrity and avoid progressive UV-induced attenuation.
How is lamp lifetime monitored?
AvaSoft-FULL logs cumulative operating hours per lamp and issues configurable warnings at user-defined thresholds (e.g., 1800 h for deuterium, 900 h for halogen).
Does the source support continuous-wave (CW) and pulsed operation modes?
The lamp drivers operate in CW mode only; however, the integrated TTL shutter enables externally triggered pulsed illumination with sub-millisecond rise/fall times.