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Optimally designed for beam power measurement


  • Spectraflect®, Infragold® or Spectralon® integrating sphere interiors for reduced alignment sensitivity
  • Sturdy port frames for mounting fiber accessories
  • Three integrating sphere size options, 2, 4 or 6-inch diameter
  • Three detector options, Silicon (Si), Germanium GE, InGaAs (IN)
  • Second detector port for a spectrometer or additional fiber
  • NIST traceable system calibrations


  • Lasers
  • Laser Diodes
  • Laser Diode Modules
  • Divergent Monochromatic Sources

The Labsphere Laser Power Measurement Systems (LPMS) Series assures an accurate, reproducible method of determining the total power from a collimated or divergent laser or laser diode. Specifically designed for laser applications, LPMS spheres are ideal for measuring the total power of a beam of optical radiance. Because of the unique geometry of the sphere, beam power measurements are independent of beam polarization, and are insensitive to beam alignment. The attenuation that accompanies the sphere throughput also alleviates detector saturation. The systems can be used with an open port and can be fitted with an array of optional fiber adapters for laser diode modules or port reducers.

Labsphere's Laser Power Measurement Systems (LPMS) measure the total power of collimated and divergent lasers from 300 to 1800 nm and 15µW up to 200W, with application specific calibrations and ND filters. The sphere's unique geometry couples flexibility and accuracy with two detector ports and coating options for applications from the 250 nm to 20 microns. The system's 2, 4 or 6-inch diameter integrating sphere is coated with Labsphere's Spectraflect® or Infragold® diffuse reflectance coatings or is fabricated from our highly reflective diffuse material, Spectralon®. All materials are extremely durable and optically stable over time.

An input port that permits a beam of radiation is machined into the sphere. A detector located 45° from the entrance port views the sphere wall next to the entrance port. The field of view of the detector is designed to limit the viewing area so that highly divergent sources may be input without affecting measurement accuracy. The systems provide options for laser power measurement over the 350 to 1800 nm wavelength region for optical powers ranging from 0.1uw to hundreds of watts. The system's calibrations are traceable to the National Institute of Standards and Technology (NIST).

Each system consists of a laser power measurement sphere, post, post holder and base assembly, a detector assembly, SC 6000 programmable radiometer/photometer and multi-wavelength calibration. A second detector port gives the user the flexibility to add an additional detector assembly for broader spectral sensitivity or add a spectrometer for spectral characterization.

Download Datasheet


Model  Coating  Si Detector GE Detector IN Detector
LPMS-020-XX*-YY  SF  AS-02489-100  AS-02489-300  AS-02489-400

SL  AS-02488-100  AS-02488-300  AS-02488-400

IG  N/A AS-02490-300  AS-02490-400
LPMS-040-XX-YY  SF  AS-02492-100  AS-02492-300  AS-02492-400

SL  AS-02491-100  AS-02491-300  AS-02491-400

IG  N/A AS-02496-300  AS-02496-400
LPMS-060-XX-YY  SF  AS-02495-100  AS-02495-300  AS-02495-400

SL  AS-02493-100  AS-02493-300  AS-02493-400

IG  N/A AS-02497-300  AS-02497-400

*XX denotes coating option: SF= Spectraflect®, SL= Spectralon®, IG= Infragold®
YY denotes detector option: (Si) =Silicon, (Ge)= Germanium, (IN)= InGaAs Indium Gallium Arsenide

System Includes:

  • Laser Power Measurement Sphere 2, 4 or 6-inch diameter
  • Detector: Si, Ge or InGaAs
  • SCC-PM Calibration
  • SC 6000 Radiometer/Photometer

System Properties and Performance

System Specifications  LPMS-020  LPMS-040  LPMS-060
Sphere Diameter: 2 inch (5 cm)  4 inch (10 cm) 6 inch (14.4 cm)
Entrance Port Frame Diameter:
0.5 inch (12.7 mm)  1 inch (2.5 cm)  1 inch (2.5 cm)
Sphere Coating Reflectance: 98% SF 98% SF 98% SF

99% SL 99% SL 99% SL

95% IG 95% IG 95% IG

Detector Port #1 holds standard 12.7mm diameter optical filters for system detector.

Detector Port #2 holds standard 12.7mm diameter optical filters. Use for optional second detector, fiber spectrometer for spectral characterization, or cap when not in use.

Laser Power Measurement System Standard Calibration

Si Detector System SCC-PM-SI 350 nm to 1100 nm in 25 nm increments  LPMS, Silicon
Ge Detector System  SCC-PM-GE 800 nm to 1800 nm in 25 nm increments LPMS, Germanium
InGaAs Detector System  SCC-PM-IN 900 nm to 1700 nm in 25 nm increments  LPMS, InGaAs

Each standard system comes with a multiple wavelength spectral responsivity calibration. The SC 6000 radiometer is programmed to display the laser optical power in units of watts.

Detector Specifications

Detector Silicon  Germanium
Active Area:  4.5 mm2  19.6 mm2  7 mm2
Range: 190 - 1100 nm  800 - 1800 nm  900 - 1700 nm
Peak Responsivity: (A/W) 0.5 a/w @950 nm  0.9 a/w @1550 nm 0.9 a/w @1300 nm

 Radiometer/Photometer Specifications

Radiometer/Photometer  SC 6000
Power Requirements: 110/220 VAC, 50/60 Hz
Current Dynamic Range: 1 pA – 20 mA
Computer Interface: Ethernet

 Optional Calibration

Single Wavelength Power Calibrations, SCC-PS: Calibration laser power meter at a single wavelength of choice. Specify desired wavelength of calibration when ordering.

Optional Accessories

  • Fiber Adapters
  • Detectors
  • Optical Filters
  • Port Plugs
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