A laser module has an optical amplifier, a first etalon and a wavelength selectable mirror. The backflow prevention adds sufficient minimum flow resistance, thereby enhancing the performance of the pulse dampening over a wider range of flow rates resulting in consistent gradient performance. The dual-mode PMOS transistor has a size and gate-oxide thickness each having a magnitude that cannot accommodate a permanent tie to the high voltage. In the reflecting configuration, first and second mirrored inserts, supported by respective insert portions on the storage assembly, cooperate with first and second reflecting plates on the storage assembly to redirect light from the emitter in a circuitous path. Each luminescence pixel that belongs to a kth drive block further includes a first switch provided between the first signal line and the current controller. The OLED display includes two substrates with organic light emitting elements therebetween.