Study of optical losses of Nd3+ doped silicon rich silicon oxide for laser cavity. - Archive ouverte HAL
Journal Articles Thin Solid Films Year : 2012

Study of optical losses of Nd3+ doped silicon rich silicon oxide for laser cavity.

Abstract

Planar and strip-loaded waveguidesmade of Nd3+-doped silicon rich silicon oxide (SRSO) have been fabricated by reactive magnetron sputtering and characterized, with special emphasis on the optical losses. The refractive index of Nd3+-doped SRSO layers was measured by both m-line method and reflectance spectroscopy. From these measurements, the Si volume fraction and also the Nd3+-doped SRSO index dispersion were deduced by using the Bruggeman model. At 1.06 μm, Nd3+-doped SRSO refractive index was equal to 1.543 corresponding to a Si volume fraction of 6.5%. The opto-geometrical parameters of waveguides have been studied in order to obtain single mode waveguides at 1.06 μm. The optical losses are measured as a function of wavelength and are found to be about 0.8 and 0.4 dB/cm at 1.06 and 1.55 μm, respectively. Measurements are confirmed by theoretical models showing that the losses are essentially attributed to surface scattering. From these optical loss values, a percentage value of the Nd active concentration superior of 14.5% was deduced to have a positive modal gain of waveguide.

Dates and versions

hal-00738664 , version 1 (04-10-2012)

Identifiers

Cite

Parastesh Pirasteh, Joël Charrier, Yannick Dumeige, Yann G. Boucher, Olivier Debieu, et al.. Study of optical losses of Nd3+ doped silicon rich silicon oxide for laser cavity.. Thin Solid Films, 2012, 520, pp.4026. ⟨10.1016/j.tsf.2012.01.033⟩. ⟨hal-00738664⟩
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