Dielectric selective mirror for intracavity wavelength selection in far-infrared p-Ge lasers
Abbreviated Journal Title
J. Appl. Phys.
MODE SELECTION; FIR LASER; GERMANIUM; SILICON; Physics, Applied
A robust metal-free intracavity fixed-wavelength selector for the cryogenically cooled far-infrared p-Ge laser is demonstrated. The device is a back mirror consisting of a thin silicon etalon and dielectric SrTiO3 flat. A laser line width of 0.2 cm-1 is achieved, which corresponds to an active cavity finesse of similar to0.15. The wavelength position and spectral purity are maintained over a wide range of laser operating fields. Use of SrTiO3 lowers the laser resonance line frequencies by similar to1 cm-1 compared with expectations for metal mirrors. The effect is due to phase shift, which is determined from far-infrared reflectivity measurements of SrTiO3. A p-Ge laser with such selector is free from danger of electrical breakdown and mirror oxidation during repeatable thermal cycling, which makes it more reliable than previous selection schemes for practical applications. (C) 2003 American Institute of Physics.
Journal of Applied Physics
"Dielectric selective mirror for intracavity wavelength selection in far-infrared p-Ge lasers" (2003). Faculty Bibliography 2000s. 3716.