Aging process of photosensitive chalcogenide films deposited by electron beam deposition

Charpentier, Frédéric; Dussauze, Marc; Cathelinaud, Michel; Delaizir, Gaëlle; Kamitsos, E. I.; Adam, Jean-Luc; Bureau, Bruno; Nazabal, Virginie

doi:10.1016/j.jallcom.2011.04.054

Cited by 19 publications

(6 citation statements)

References 48 publications

(52 reference statements)

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“…Tapers are also mounted on a metal mount to strengthen the fibre and keep it stable. Without poly(methyl methacrylate) protection, the physical ageing of ChG glasses is accelerated by exposure to light and in air43. Only under controlled inert (Argon) and dry (molecular sieves) atmosphere, will uncoated tapers remain stable as reported in this work.…”

Section: Methodssupporting

confidence: 51%

“…The pump laser is a 200 mW continuous wave external cavity QCL, tunable from 4.385 to 4.58 μm. The tapered fibre and microresonator are kept under a dry and inert atmosphere to preserve them from degradation and physical ageing of the ChG fibre43. The QCL light is evanescently coupled to the crystalline microresonator using the ChG tapered fibre.…”

Section: Resultsmentioning

confidence: 99%

“…PD, photodetector. Tapered fibre and microresonator are kept under a dry and inert atmosphere to preserve from degradation and physical ageing of ChG fibre43. ( f ) Quality factor dependence of different fluoride crystals with respect to the wavelength.…”

Section: Figurementioning

confidence: 99%

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Mid-infrared ultra-high-Q resonators based on fluoride crystalline materials

et al. 2016

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The unavailability of highly transparent materials in the mid-infrared has been the main limitation in the development of ultra-sensitive molecular sensors or cavity-based spectroscopy applications. Whispering gallery mode microresonators have attained ultra-high-quality (Q) factor resonances in the near-infrared and visible. Here we report ultra-high Q factors in the mid-infrared using polished alkaline earth metal fluoride crystals. Using an uncoated chalcogenide tapered fibre as a high-ideality coupler in the mid-infrared, we study via cavity ringdown technique the losses of BaF2, CaF2, MgF2 and SrF2 microresonators. We show that MgF2 is limited by multiphonon absorption by studying the temperature dependence of the Q factor. In contrast, in SrF2 and BaF2 the lower multiphonon absorption leads to ultra-high Q factors at 4.5 μm. These values correspond to an optical finesse of , the highest value achieved for any type of mid-infrared resonator to date.

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Section: Methodssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 99%

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Mid-infrared ultra-high-Q resonators based on fluoride crystalline materials

et al. 2016

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“…This glass has been selected due to its commercial availability and known photosensitivity. Some previous works have already shown that it can be deposited into thin films using by pulsed laser deposition [25][26][27] or thermal evaporation [28][29][30] or electron beam deposition (EBD) [31], because it allows producing homogeneous thick and large aperture films that will be compatible with the production of multilayer optical interference filters. Using reverse engineering coupled with a Tauc Lorentz model, the optical properties of single layers were determined and a precise study of the photosensitive effects is presented.…”

Section: Introductionmentioning

confidence: 99%

Optical characterization of photosensitive AMTIR-1 chalcogenide thin layers deposited by electron beam deposition

Joerg

Lemarchand

Zhang

et al. 2016

Journal of Non-Crystalline Solids

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Amorphous Ge33As12Se55 films have been deposited by electron beam physical vapor deposition and their optical properties have been studied using reverse engineering on spectrophotometric measurements. Definition of the different optical constants were made by Tauc-Lorentz model allowing simultaneous characterization in high and low absorption area. Moreover an investigation of the layer's photosensitivity with an exposure wavelength at ~808 nm has been carried out and reveals a photo-bleaching effect generating up to 0.04 refractive index variation at 1µm. Finally the stability of the fabricated layers is studied.

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“…In the case of the use of alumino-silicates, the photosensitivity and photoexpansion of the multilayer structure can be expected to be reduced [24]. The combination of the oxide films with the chalcogenides can also play an advantageous role in the mechanical properties as well as their chemical durability against aging in natural atmosphere [23,25]. The difficulty of synthesizing optically homogeneous oxychalcogenides, whether in the form of bulk glass or thin films, could be bypassed by providing optical components based on superimposed oxide and chalcogenide layers.…”

Section: Introductionmentioning

confidence: 99%