Photoluminescence and lasing in whispering gallery mode glass microspherical resonators (original) (raw)
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We report experimental results on the characterization of microspherical cavities fabricated in Er3+-doped modified-silica and phos- phate glasses. The spectroscopic properties of the bulk precursor glasses as compared to the obtained microspheres were investigated by photoluminescence spectroscopy and lifetime measurement for the 4I13/2 ! 4 I15/2 transition of Er 3+ ions. In both types of glasses we dem- onstrate whispering gallery mode laser action at various wavelengths around 1550 nm by using a 1480 nm pump laser coupled through a tapered fiber.
Spectroscopic and lasing properties of Er 3+-doped glass microspheres
Journal of Non-crystalline Solids, 2006
We report experimental results on the characterization of microspherical cavities fabricated in Er3+-doped modified-silica and phosphate glasses. The spectroscopic properties of the bulk precursor glasses as compared to the obtained microspheres were investigated by photoluminescence spectroscopy and lifetime measurement for the 4I13/2 → 4I15/2 transition of Er3+ ions. In both types of glasses we demonstrate whispering gallery mode laser action at various wavelengths around 1550 nm by using a 1480 nm pump laser coupled through a tapered fiber.
2021
This work reports the experimental fabrication and characterization of the Er3+-doped silica microspheres (mS) and numerical investigation of the effects of size and surrounding medium on the optical properties of whispering-gallery-mode (WGM) lasers. The heat melting method of two discharge electrodes was used to produce the Er3+-doped silica mSs of diameters up to several tens of micrometers. The 125-mm diameter single-mode optical fiber was tapered with a cone angle formed by chemical etching in hydrofluoric acid (HF) solutions. It was used to produce the mSs and couple the pumped laser into mS surface as well was coupled out the lasing emission. The WGM lasers at telecom regime of ~1520-1570 nm were characterized in both clockwise (CW) and counterclockwise (CCW) propagation directions. By adjusting the coupling gap between the tapered optical fiber and the mS surface, the selectivity of the multi- or single-emitted modes of the mS laser was achieved. We performed finite-differen...
Wavelength Shift in Erbium-doped Glass microspherical Whispering Gallery Mode Lasers
We have succeeded in continuous-wave laser oscillation on 4I13/2 → 4I15/2 transition of Er3+ ions around 1550 nm in microspheres fabricated with Erbium doped fluoride ”ZBLALiP” and phosphate ”Schott” glasses. The microsphere lasers have been studied under pumping at 1480 nm. Whispering Gallery Mode laser spectra were analyzed for different sphere diameters. Wavelength Red-shift effect of both fluorescence and laser spectra was experimentally observed in Er3+ doped phosphate glass when the pump power was increased, originating from thermal effects. We showed coupling effect between microspherical laser and an external cavity made by a metallic mirror. We observed line shift to lower wavelengths due to optical feedback effect. A general overview of the current state of the art in microspheres is given as well as a more general introduction.
Rare earth-doped glass whispering gallery mode micro-lasers
European Physical Journal Plus, 2023
We review the works performed on whispering gallery mode (WGM) micro-optical resonators made in rare-earth (RE) doped glasses for implementing low threshold and narrow line coherent sources. These types of micro-lasers, because of their small size and ease of fabrication can be a useful tool for the characterization of laser glasses and have several applications, especially as sensors.
Control of whispering-gallery-mode spectrum from Erbium-doped silica microsphere lasers
JOSA-B Vol. 30, No. 6 / June 2013, pages 1586-1589
High power Whispering-Gallery-Modes (WGMs) emitted from microcavity lasers have attracted attention for many applications such as optical signal processing, spectroscopy, optical sensors and large-bandwidth optical communications. In this paper, we present a novel and simple approach for controlling the output WGMs of Erbiumdoped silica microsphere lasers. With the presented scheme, accurate adjustment of the coupling gap between the collection fiber taper and the spherical surface allows to select different single modes of the microsphere laser or different multimode configurations (also function of the waist diameter of taper and the Er-doped concentration). The nonlinear frequency shift of the microsphere cavity as a function of the intracavity power has also been studied. The high intensity and high side mode suppression ratio of the obtained single WGM are suitable for spectroscopy, optical sensors and communications.
Microsphere laser in Er3+-doped oxide glasses
SPIE Proceedings, 2004
We have succeeded in continuous-wave laser oscillation on I13/2-115/2 transition of Er3+ ions around 1550 nra in microspheres fabricated with Erbium doped phosphate "Schott" and silica "Baccarat" glasses. The microsphere lasers have been studied under pumping at 1480 nm. Whispering Gallery Mode laser spectra were analyzed for different sphere diameters. Wavelength Red-shift effect of both fluorescence and laser spectra was experimentally observed in Er3+ doped phosphate glass when the pump power was increased, originating from thermal effects.
Thermo-optical tuning of whispering gallery modes in Er:Yb co-doped phosphate glass microspheres
Applied Physics B, 2010
We demonstrate an all-optical, thermally assisted technique for broad-range tuning of whispering gallery modes in microsphere resonators fabricated from an Er:Yb co-doped phosphate glass (IOG-2). The microspheres are pumped at 978 nm and the heat generated by absorption of the pump expands the cavity, thereby altering the cavity size and refractive index. We demonstrate a significant nonlinear tuning range of greater than 700 GHz of both C-and L-band cavity emissions via pumping through a tapered optical fibre. Finally, we show that large linear tuning up to ∼488 GHz is achievable if the microsphere is alternatively heated by coupling laser light into its support stem.