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