<p>➀ ElFys has launched a circular four-quadrant near-infrared detector named QPD-385-Y, featuring a 14mm diameter active area and 38.5mm² sensing surface in each quadrant.</p><p>➁ The sensor has a dark current of typically 5nA per element and a temperature coefficient of 1.11x/°C, making it suitable for applications like laser alignment and free-space optical communication.</p><p>➂ It offers a typical sensitivity of 640mA/W when illuminated with 1.064μm wavelength light, and comes in both heated and unheated versions with a top-hat can design.</p>