Abstract
| Original language | English |
|---|---|
| Title of host publication | EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices |
| Place of Publication | Strasbourg Cedex 02, France |
| Publisher | Elsevier |
| Pages | - |
| Number of pages | 1 |
| Publication status | Published - May 2007 |
| Event | E-MRS Spring meeting 2007 - Strasbourg, France Duration: 28 May 2007 → 1 Jun 2007 |
Conference
| Conference | E-MRS Spring meeting 2007 |
|---|---|
| Country | France |
| City | Strasbourg |
| Period | 28/05/07 → 1/06/07 |
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Keywords
- EWI-11627
- IR-62075
- METIS-245885
- IOMS-APD: Advanced Photonic Devices
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Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry. / Luo, Y.; Gardillou, F.; Borca, C.N.; Coric, D.; Romanyuk, Y.E.; Pollnau, Markus; Hoffmann, P.; Salathé, R.P.
EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices. Strasbourg Cedex 02, France : Elsevier, 2007. p. -.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review
TY - GEN
T1 - Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry
AU - Luo, Y.
AU - Gardillou, F.
AU - Borca, C.N.
AU - Coric, D.
AU - Romanyuk, Y.E.
AU - Pollnau, Markus
AU - Hoffmann, P.
AU - Salathé, R.P.
PY - 2007/5
Y1 - 2007/5
N2 - KYW is a promising candidate for diode-pumped solid-state lasers and Raman self converters. The optically active rare-earth ions can easily substitute the Y3+ ion with a high doping level. Because of its low laser thresholds, high efficiencies, and third-order nonlinear effects, rare-earth-ion-doped KYW is a promising laser material. By means of UV-photolithography and reactive-ion etching, micro-structured waveguides, either in the form of channels or Y-junctions have been realized from 2-10 micron thick (Lu,Gd)-codoped KYW:Yb thin films grown on a 1-mm thick (010) KYW substrate. The width of the waveguide channels ranges from 2 to 10 microns with a length of about half a centimeter. Given a refractive index contrast of 7.5x10-3 of the doped thin film with respect to the undoped substrate, monomode waveguiding has been successfully demonstrated at a wavelength of 980 nm. From the results obtained by optical low coherence reflectometry (OLCR) in reflection mode on those rare-earth-ion-doped KYW waveguides, we have been able to precisely evaluate their length, thickness, birefringence and propagation loss at different wavelengths. The relatively high propagation loss (~ 5 dB/cm @ 1550 nm) of these channels compared to unstructured, 17-micron-thick KYW:Yb planar waveguides (~ 0.1-0.2 dB/cm @ 1020 nm) shows that either the co-doping by Gd and Lu, or the tighter vertical confinement or the microstructuring currently adds additional losses which need to be improved. Generally, these co-doped KYW waveguides open up new possibilities for fabricating lasers and integrated optical devices in rare-earth-iondoped microstructures.
AB - KYW is a promising candidate for diode-pumped solid-state lasers and Raman self converters. The optically active rare-earth ions can easily substitute the Y3+ ion with a high doping level. Because of its low laser thresholds, high efficiencies, and third-order nonlinear effects, rare-earth-ion-doped KYW is a promising laser material. By means of UV-photolithography and reactive-ion etching, micro-structured waveguides, either in the form of channels or Y-junctions have been realized from 2-10 micron thick (Lu,Gd)-codoped KYW:Yb thin films grown on a 1-mm thick (010) KYW substrate. The width of the waveguide channels ranges from 2 to 10 microns with a length of about half a centimeter. Given a refractive index contrast of 7.5x10-3 of the doped thin film with respect to the undoped substrate, monomode waveguiding has been successfully demonstrated at a wavelength of 980 nm. From the results obtained by optical low coherence reflectometry (OLCR) in reflection mode on those rare-earth-ion-doped KYW waveguides, we have been able to precisely evaluate their length, thickness, birefringence and propagation loss at different wavelengths. The relatively high propagation loss (~ 5 dB/cm @ 1550 nm) of these channels compared to unstructured, 17-micron-thick KYW:Yb planar waveguides (~ 0.1-0.2 dB/cm @ 1020 nm) shows that either the co-doping by Gd and Lu, or the tighter vertical confinement or the microstructuring currently adds additional losses which need to be improved. Generally, these co-doped KYW waveguides open up new possibilities for fabricating lasers and integrated optical devices in rare-earth-iondoped microstructures.
KW - EWI-11627
KW - IR-62075
KW - METIS-245885
KW - IOMS-APD: Advanced Photonic Devices
M3 - Conference contribution
SP - -
BT - EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices
PB - Elsevier
CY - Strasbourg Cedex 02, France
ER -