Tunable semiconductor ‘lasers’ and tunable semiconductor ‘laser’ arrays, of a wavelength between 9 μm and 17 μm, as well as array stacks of semiconductor ‘lasers’ containing at least one tunable semiconductor ‘laser’ array of such wavelength. Notes: 1. Semiconductor ‘lasers’ are commonly called ‘laser’ diodes. 2. This item does not cover semiconductor ‘lasers’ defined in items 0B001.h.6 and 6A005.b