Quantum cascade laser (QCL) manufacturer Block Engineering LLC of Marlborough, Mass., has added SKAE Associates of Lexington and Pembroke Instruments of San Francisco to its family of sales representatives. SKAE Associates will cover the New England states as an exclusive representative for Block Engineering’s line of QCL-based products. Pembroke Instruments serves emerging markets within life sciences, semiconductor, R&D and academic research. It will be the exclusive representative for California. Block Engineering added the representatives as a step in its strategy to increase its focus on industrial and academic markets and enhance its presence in commercially critical US locations.