US Patent Issued to Excelitas Technologies on Aug. 12 for "Tunable VCSEL polarization control with intracavity subwavelength grating" (Massachusetts Inventor)

ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,388,235, issued on Aug. 12, was assigned to Excelitas Technologies Corp. (Waltham, Mass.).

"Tunable VCSEL polarization control with intracavity subwavelength grating" was invented by Bartley C. Johnson (North Andover, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A very strong selection mechanism is provided in a tunable vertical cavity surface emitting laser (VCSEL) by manipulating the laser threshold to be different for TE and TM polarization by a employing a subwavelength grating in the laser cavity. The laser selects the polarization with the lowest threshold. The grating does not diffract and does not add loss to the cavity. It works by crea...