NDLI: Single-mode UV-written buried channel waveguide lasers in direct-bonded neodymium-doped SGBN

Content Provider	IEEE Xplore Digital Library
Author	Gawith, C.B.E. Fu, A. Bhutta, T. Shepherd, D.P. Taylor, E.R.M. Smith, P.G.R. Milanese, D. Ferraris, M.
Copyright Year	2002
Description	Author affiliation: Optoelectron. Res. Centre, Southampton Univ., UK (Gawith, C.B.E.; Fu, A.; Bhutta, T.; Shepherd, D.P.; Taylor, E.R.M.; Smith, P.G.R.)
Abstract	Summary form only given. We present the first demonstration of single-mode buried channel waveguide lasers in neodymium-doped SGBN glass by a combination of direct bonding and direct UV writing techniques. Based on intersubstrate ion-exchange between specifically designed glass substrate materials we have used direct bonding to provide a region of atomic contact between Nd:SGBN and a potassium-rich borosilicate cladding substrate, between which K/sup +/-Na/sup +/ ion-exchange can occur. By taking this approach we have achieved a low-loss buried planar waveguide layer in the Nd:SGBN glass, which retains the photosensitive characteristics of the bulk material and into which single-mode channel waveguide structures can be directly written using a focussed UV beam. For this initial demonstration, a Nd:SGBN substrate containing SiO/sub 2/ (60 wt.%), GeO/sub 2/ (10 wt.%), B/sub 2/O/sub 3/ (10 wt.%), Na/sub 2/O (19 wt.%), and Nd/sub 2/O/sub 3/ (1 wt.%), was prepared and direct-bonded to a potassium-rich glass of similar composition to BK-7. Characterization of the 7.5-mm-long buried channel laser waveguide device was performed using a Ti:sapphire laser operating at 808 nm. The resultant 1059 nm laser output exhibited milliwatt-order laser thresholds, single-mode operation, propagation losses of <0.3 dB cm/sup -1/, and a maximum output power of 2 mW for 32 mW of absorbed pump power. These initial results demonstrate that optimisation of glass composition and direct UV writing parameters could lead to efficient low-loss buried waveguide devices in versatile bulk multicomponent oxide glasses for use with integrated optics.
Sponsorship	IEEE/Lasers & Electro-Opt. Soc. OSA-Opt. Soc. America Quantum Electron. Div. Eur. Phys. Soc. Opt. Soc. Japanese Quantum Electron. Joint Group
Starting Page	232
Ending Page	233
File Size	288960
Page Count	2
File Format	PDF
ISBN	1557527067
DOI	10.1109/CLEO.2002.1033884
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Optical Soc. of America
Subject Keyword	Atomic beams Power lasers Waveguide lasers Glass Writing Optical materials Planar waveguides Bonding Optical waveguides Pump lasers
Content Type	Text
Resource Type	Article

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