Labsphere CSTM-LPMS Laser Power Measurement Integrating Sphere
| Brand | Labsphere |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | CSTM-LPMS |
| Price Range | USD $1,200 – $65,000 |
Overview
The Labsphere CSTM-LPMS Laser Power Measurement Integrating Sphere is an engineered optical calibration and measurement system designed for accurate, repeatable total radiant flux quantification of highly divergent and collimated laser sources—including laser diodes, VCSEL arrays, CO₂ lasers (10.6 µm), Nd:YAG systems (1.064 µm), and broadband IR emitters. Based on the fundamental principle of diffuse multiple-scattering within a spherically symmetric cavity, the CSTM-LPMS employs a high-reflectance Infragold® coating (700 nm – 20 µm) to ensure uniform spatial integration and minimal wavelength-dependent responsivity drift. Its geometry supports full-hemispheric collection up to ±40° half-angle divergence, eliminating dependence on precise beam alignment or iterative repositioning—critical for production-line validation, R&D characterization, and ISO/IEC 17025-compliant optical testing laboratories.
Key Features
- High-efficiency Infragold® coating with >97% average reflectance across 700 nm–20 µm spectral range
- Water-cooled thermal management architecture rated for continuous-wave (CW) irradiance up to 2 kW/cm² at 10.6 µm
- Dual detector ports (standard 1″ and 0.5″ NIST-traceable apertures) enabling simultaneous radiometric and spectroradiometric acquisition
- Integrated laser target plate positioned opposite input port to homogenize incident energy distribution and suppress localized heating
- Two 1/4″-18 NPT cooling ports compatible with deionized water, ethylene glycol/water mixtures, or closed-loop chiller systems (max operating pressure: 15 psi; safety relief valve set at 35 psi)
- Three standard sphere diameters (4″, 6″, and 8″) optimized for power range scalability—from mW-class VCSELs to multi-kW industrial IR lasers
- Optional polarization-insensitive neutral density filters to mitigate polarization bias and detector saturation
Sample Compatibility & Compliance
The CSTM-LPMS accommodates free-space laser beams from UV through mid-IR without fiber coupling requirements. It is routinely deployed in applications governed by ASTM E275, ISO 11146-1, IEC 60825-1, and ANSI Z136.1 safety and measurement standards. The sphere’s construction adheres to GLP/GMP-aligned documentation protocols, supporting audit-ready calibration records traceable to NIST SRM 2242 and NPL standards. All mechanical interfaces conform to ANSI/ASME B1.20.1 pipe thread specifications. The Infragold® surface meets MIL-C-48497A durability requirements for thermal cycling and abrasion resistance under sustained high-flux exposure.
Software & Data Management
While the CSTM-LPMS operates as a passive optical component, it integrates seamlessly with industry-standard data acquisition platforms including Ocean Insight OceanView, Thorlabs PM100D firmware, and Labsphere’s own SpectraSuite and LightMent software suites. When paired with calibrated photodiodes (e.g., S120VC, FDS1010) or spectrometers (e.g., QE Pro, Maya2000 Pro), the system supports automated data logging with timestamped metadata, configurable averaging, and real-time power stability monitoring. Full compliance with FDA 21 CFR Part 11 is achievable via optional electronic signature modules and audit-trail-enabled configurations when deployed in regulated pharmaceutical or medical device manufacturing environments.
Applications
- VCSEL array total output power validation in 3D sensing and LiDAR module development
- Stability profiling of high-power CW and pulsed IR lasers (CO₂, Nd:YAG, fiber lasers) during qualification and burn-in testing
- Beam homogeneity assessment and M²-independent radiant exitance measurement
- Calibration transfer between primary standards labs and secondary metrology facilities
- Optical detector responsivity verification across extended infrared bands (SWIR to LWIR)
- Thermal load modeling for laser safety interlock design and enclosure certification
FAQ
What spectral range does the Infragold® coating support?
The Infragold® coating delivers stable, high-diffuse reflectance from 700 nm to 20 µm, covering near-IR through long-wave infrared, with minimal angular or polarization dependence.
Can the CSTM-LPMS be used for pulsed laser measurements?
Yes—it is qualified for both continuous-wave and nanosecond-to-millisecond pulsed lasers, provided average power remains within the thermal dissipation limits of the selected sphere size and cooling configuration.
Is NIST-traceable calibration included with purchase?
Calibration certificates traceable to NIST Standard Reference Materials (e.g., SRM 2242) are available as optional add-ons and must be specified at time of order.
What coolant types are recommended for high-duty-cycle operation?
Deionized water is standard; for sub-ambient or high-stability thermal control, 30/70 ethylene glycol/water mixtures are recommended—always verified against pump compatibility and corrosion inhibitor specifications.
How is detector linearity validated in this system?
Linearity is verified per ISO 17025 procedures using attenuated reference sources and stepwise power ramping, with residual nonlinearity typically <±0.3% over 6 decades of dynamic range when paired with calibrated silicon or InGaAs detectors.
