Abstract

Among various gas, Raman spectroscopy has an advantage to apply to multi-gas sensor, because the specific wavelength shift by one laser wavelength can be identified. However, it requires high power laser, to generate sufficient Raman signals. To miniaturize laser gas sensor, a simple diode pumped Power build-up cavity (PBC) was reported.¹ The PBC is consisted of anti-reflection (AR) coated low power laser diode, Gradient index (GRIN) lens, and PBC, which is high finesse external cavity, it can generate 100 W intracavity power. This interesting coupled resonator as Raman lights source has been studied in detail. However, the physical analysis of it hasn’t done enough yet. We will report the characteristics as coupled resonator. We will report and Longitudinal mode and the frequency stability which the PBC is needed to apply to spectroscopy.

© 2002 Optical Society of America