Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry

Y. Luo, F. Gardillou, C.N. Borca, D. Coric, Y.E. Romanyuk, Markus Pollnau, P. Hoffmann, R.P. Salathé

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Downloads (Pure)

Abstract

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.
Original languageEnglish
Title of host publicationEMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices
Place of PublicationStrasbourg Cedex 02, France
PublisherElsevier
Pages-
Number of pages1
Publication statusPublished - May 2007
EventE-MRS Spring meeting 2007 - Strasbourg, France
Duration: 28 May 20071 Jun 2007

Conference

ConferenceE-MRS Spring meeting 2007
CountryFrance
CityStrasbourg
Period28/05/071/06/07

Fingerprint

tungstates
yttrium
potassium
rare earth elements
waveguides
propagation
ions
laser materials
photolithography
thin films
solid state lasers
wavelengths
lasers
converters
birefringence
diodes
etching
substitutes
refractivity
microstructure

Keywords

  • EWI-11627
  • IR-62075
  • METIS-245885
  • IOMS-APD: Advanced Photonic Devices

Cite this

Luo, Y., Gardillou, F., Borca, C. N., Coric, D., Romanyuk, Y. E., Pollnau, M., ... Salathé, R. P. (2007). Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry. In EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices (pp. -). Strasbourg Cedex 02, France: Elsevier.
Luo, Y. ; Gardillou, F. ; Borca, C.N. ; Coric, D. ; Romanyuk, Y.E. ; Pollnau, Markus ; Hoffmann, P. ; Salathé, R.P. / Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry. EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices. Strasbourg Cedex 02, France : Elsevier, 2007. pp. -
@inproceedings{401a7f9f11f144b183bff29b334c548a,
title = "Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry",
abstract = "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.",
keywords = "EWI-11627, IR-62075, METIS-245885, IOMS-APD: Advanced Photonic Devices",
author = "Y. Luo and F. Gardillou and C.N. Borca and D. Coric and Y.E. Romanyuk and Markus Pollnau and P. Hoffmann and R.P. Salath{\'e}",
year = "2007",
month = "5",
language = "English",
pages = "--",
booktitle = "EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices",
publisher = "Elsevier",

}

Luo, Y, Gardillou, F, Borca, CN, Coric, D, Romanyuk, YE, Pollnau, M, Hoffmann, P & Salathé, RP 2007, Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry. in EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices. Elsevier, Strasbourg Cedex 02, France, pp. -, E-MRS Spring meeting 2007, Strasbourg, France, 28/05/07.

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 proceedingConference contributionAcademicpeer-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 -

Luo Y, Gardillou F, Borca CN, Coric D, Romanyuk YE, Pollnau M et al. Measurement of propagation loss in rare-earth-ion-doped potassium yttrium double tungstate (KYW) waveguides by optical low coherence reflectometry. In EMRS 2007, Symposium C: Rare Earth ion doping for photonics: Materials, mechanisms and devices. Strasbourg Cedex 02, France: Elsevier. 2007. p. -