An implantable monitor and method to acquire, store, and display physiological data for the diagnosis of vasovagal syncope or intermittent cardiac arrhythmias. Side-weir and delivery-nozzle preheating furnaces are arranged away from the casting roll unit. An output outputs a driving guide to the calculated defile under control of the controller. Also, a transistor sourcedrain region 80, 90 having a SiGe sourcedrain extension 90 that contains evenly distributed dopants, is highly doped, and has highly abrupt edges. Hence, by arranging two types of optical amplification media with different rare earth concentrations such that the population inversion of the low concentration medium is higher than that of the high concentration medium, sufficient overall gain of the laser light source can be obtained while effectively suppressing photodarkening in the two types of optical amplification media.