Coherence phenomena in laser-atom interactions have been a focus of interest for decades. However, due to the small size of typical molecular transition moments, the field of coherence effects in laser-molecule interactions is closer to its infancy. In addition, unlike atoms, even the simplest molecules are open systems, in that every excited molecular ro-vibrational level is radiatively coupled to many more energy levels than in the case of any excited atomic state. Therefore, molecules – with their rich excitation pathways and the variety of molecular interactions – make attractive candidates in the development of novel and powerful applications in this field.