Independent of beam geometry and without the need for auxiliary optics, integrating spheres are ideal for collecting the total radiant power emitted by highly divergent sources such as laser diodes as well as collimated sources such as lasers. Accurate, repeatable measurements may be performed quickly and easily without painstaking positioning and alignment procedures. Integrating sphere measurements of laser power also eliminate polarization effects and beam positioning errors often associated with filter attenuation techniques.

Laser power measurement spheres are offered for applications in the wavelength regions from the UV-VIS-NIR to the NIR-MIR. Each laser power measurement sphere is designed to accommodate any of the detector assemblies offered by Labsphere. Labsphere will custom design a laser power measurement system to suit your needs.

UV-VIS-NIR Spectral Region

The LPM-040-SL Laser Power Measurement Sphere is a 4 inch diameter integrating sphere designed for the measurement of lasers and laser diodes in the UV-VIS-NIR spectral region (250 – 2500 nm). The interior of the sphere is machined from Spectralon, a thermoplastic resin; which is characterized by >95% reflectance over the 250 – 2500 nm wavelength region.

The LPM-040-SL has three ports located at 90° intervals. The detector port (0.50 inch diameter) is located between the input and auxiliary ports (1 inch diameter each).

A filter loading mechanism that mounts 0.50 inch diameter filters in front of the detector is a standard feature. A removable Spectralon laser target that fits into the auxiliary port and is designed to receive and disperse the first strike from the laser is included. The auxiliary port is properly baffled to prevent first strike illumination from reaching the detector. A Spectralon port plug is also provided to eliminate a port if required. The sphere assembly has a 1/4-20 boss and is mounted to a rod with a support base. The sphere height is adjustable and the base may be removed for alternative mounting.

NIR-MIR Spectral Region

The LPM-040-IG and the LPM-060-IG Laser Power Measurement Spheres are coated with Infragold diffuse gold coating which exhibits high reflectance values (93%–96%) over the NIR-MIR wavelength region.

The LPM-040-IG and the LPM-060-IG Laser Power Measurement Spheres are identical in design to the LPM-040-SL. A removable Infragold laser target designed for the auxiliary port is included. As with the LPM-040-SL, the auxiliary port is properly baffled to prevent first strike illumination from reaching the detector. One Infragold port plug is provided to eliminate a port if required. The LPM-040-IG, 4 inch diameter integrating sphere has an 8-32 mounting boss attached rod that slides into the sleeve of a sturdy support base. The LPM-060-IG, 6 inch dimater integrating sphere has a 1/4-20 boss and is mounted to a rod with a support base. The sphere height is adjustable and the base may be removed for alternative mounting.

LPM-060-IGC, LPM-080-IGC, LPM-100-IGC
LIQUID COOLED LASER POWER MEASUREMENT SPHERES

The liquid-cooled Laser Power Measurement Spheres include three sizes of liquid-cooled integrating spheres designed for performing power measurements of high intensity pulsed and continuous wave lasers. Coated with Infragold high reflectance coating for measurements over the 700 nm – 20 µm wavelength range, the liquid-cooled design can handle a maximum power density of 2 kw/cm² (CW for 1 second exposure at 10.6 µm) while greatly reducing the self emission that would result from an uncooled sphere.

The inside diameters of the LPM-060-IGC, LPM-080-IGC and LPM-100-IGC are 6, 8 and 10 inches respectively. Each sphere has ports located at 90° intervals on the equator: the respective port diameters for the 6, 8 and 10 inch spheres are 1, 2 and 2 inches. One diffuse gold port plug is provided to eliminate a port if required.

A removable conical laser target is included. The laser target fits into a port opposite the input beam and is designed to receive the first strike from the laser and disperse its energy into the sphere. Each assembly has 0.25 inch NPT fittings to interface to the cooling system. The pressure at the input fitting should not exceed 35 psi or damage to the sphere may occur. Normal tap water or a refrigerated coolant such as ethylene glycol may be used as a coolant. If a recirculator is used, consult the manufacturer as to choice of coolant.

OPTIONAL ACCESSORIES

An optional liquid cooled laser target (HLT-200-IG) is available for the LPM-080-IGC and LPM-100-IGC Laser Power Measurement Spheres.

SPECIFICATIONS AND ORDERING INFORMATION
 

PART NO.	SPHERE DIA.(IN.)	PORTS (NO.)	INPUT PORTS (IN.)	DETECTOR PORT (IN.)	MATERIAL/ COATING	SPECTRAL RANGE
LPM-040-SL	4	3	1.00	0.50	Spectralon	250–2500 nm
LPM-040-IG	4	3	2.00	0.50	Infragold	700 nm - 20 µm
LPM-060-IG	6	3	1.00	0.50	Infragold	700 nm - 20 µm
LPM-060-IGC	6	3	1.00	1.00	Infragold	700 nm - 20 µm
LPM-080-IGC	8	3	2.00	2.00	Infragold	700 nm - 20 µm
LPM-100-IGC	10	3	2.00	2.00	Infragold	700 nm - 20 µm