S120B In Stock

The ThorLabs S120B is a top-of-the-line power sensor engineered to deliver precise optical power measurement over the visible and near-infrared wavelength range of 400 nm to 1100 nm. Specifically designed for use with the PM100 and PM30 console systems, the S120B can detect light over a broad power range of 50nW to 50mW, making it an ideal solution for a wide range of applications.

Crafted with versatility in mind, the S120B sensor's housing features a threaded input compatible with a wide range of 1” and 0.5” threaded accessories, including fiber adapters, light filters, and apertures, to facilitate convenient mounting of external optics. Furthermore, the 8-32 threaded mounting hole is designed to accommodate posts and post holders, enabling hassle-free integration with an existing optical setup. Additionally, the S120B contains a silicon diode, features an input aperture of 9.5 mm, and is compact in size, boasting dimensions of 10mm x 10mm.

The S120B is equipped with an EEPROM located in the DB9 mating connector, which stores the NIST-calibrated spectral response curve needed to deliver accurate power readings. With this, the user can be certain that all measurements are always precise and reliable. The S120B also comes with an annular IR viewing target that is removeable and makes it easy to center the measured beam to the active area of the photo-diode. The target is functional within both wavelength ranges of 400 nm to 640 nm and 800 nm to 1700 nm.

Additionally, the S120B is designed to store data in a non-volatile memory located within the connector, ensuring that the user’s data is protected even when the sensor is not in use. Maintenance of the sensor is simple and straightforward - the user can clean the housing by wiping it with a soft, damp cloth. The aperture filter of the S120B can be cleaned using compressed air to gently blow off any debris and a propanol-wetted optic tissue to wipe it down gently. As long as the sensor has not been exposed to excessive optical power, calibration remains stable over long periods of time, making once a year calibration the recommended maintenance practice.