The DRDO's Laser Science and Technology Centre (LASTEC) has unveiled an indigenous Optical Target Locater (OTL), a laser-based portable surveillance device, for detection of passive or active optical threats. The system, to be offered to the Indian Army and paramilitary forces, functions on the cat's eye effect. According to the DRDO, "Any optical system when illuminated by a laser beam returns some back-scattered energy. This retro reflected energy helps in locating optical targets against a static background. The system is an important tool for detection of any active or passive surveillance device using the retro reflected signal from their front end optics." Two variants of the OTL are being developed. The development of short range version, OTL 300, for 300 m range has been completed. OTL 1500, the long-range version, is presently undergoing test and optimisation process.
OTL 300 finds application in active scanning and monitoring of specific areas, VIP security and detection of pointed optics. The equipment has been demonstrated to potential users like Delhi Police, National Security Guards and Indian Army and was recently deployed for area sanitisation and security on several occasions.The Delhi Police has in fact ordered the OTL 300.