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1.
Nanotechnology ; 25(20): 205302, 2014 May 23.
Artigo em Inglês | MEDLINE | ID: mdl-24784527

RESUMO

Nanopillars, nanotubes and nanofibers of transparent polymethyl methacrylate (PMMA) polymer with Yb:Ln:Lu2O3 (Ln = Er or Tm) nanoparticles (NPs) (≈30-35 nm average size) have been prepared by infiltration of anodized aluminum oxide hexagonally nanopatterned templates. The outer diameter of these nanostructures is in the 330-400 nm range, with lengths up to 50 µm and a period distance of 430 nm. These nanostructures show visible upconversion (UC) emissions under excitation with 978 nm light. The steady state temperature of the polymer nanostructures is optically evidenced by the Er(3+) UC emission and optically controlled around the PMMA glass transition temperature by the excitation light, introducing a new method for NP storage in a solid and potential optically induced particle release. Full color emission is shown in tridoped (Yb:Er:Tm) samples.

2.
Opt Lett ; 36(16): 3263-5, 2011 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-21847228

RESUMO

We report what is believed to be the first resonantly pumped laser operation based on Er(3+)-doped disordered double tungstate single crystal. Efficient laser operation of an Er(3+):NaY(WO(4))(2) laser at ∼1609.6 nm was demonstrated with the naturally wideband, ∼20 nm, InGaAsP/InP laser diode pumping at ∼1501 nm. Laser wavelength tunability of ∼34 nm was also demonstrated based on disorder-broadened emission features of Er(3+):NaY(WO(4))(2) single crystal.


Assuntos
Lasers de Estado Sólido , Análise Espectral , Absorção , Temperatura
3.
Opt Lett ; 35(18): 3027-9, 2010 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-20847767

RESUMO

We report, for the first time to our knowledge, femtosecond-pulse operation of a Tm,Ho:NaY(WO(4))(2) laser at around 2060 nm. Transform-limited 191 fs pulses are produced with an average output power of 82 mW at a 144 MHz pulse repetition frequency. Maximum output power of up to 155 mW is generated with a corresponding pulse duration of 258 fs. An ion-implanted InGaAsSb quantum-well-based semiconductor saturable absorber mirror is used for passive mode-locking maintenance.


Assuntos
Lasers de Estado Sólido , Fenômenos Ópticos , Análise Espectral , Fatores de Tempo
4.
Opt Express ; 18(6): 5413-9, 2010 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-20389557

RESUMO

Tetragonal single crystals of NaT(WO(4))(2) (T = Y or Lu) co-doped with Tm(3+) and Ho(3+) ions have been employed for broadly tunable and efficient room-temperature laser operation at around 2 mum. With Ti:sapphire laser pumping at 795 nm, a slope efficiency and a maximum output power as high as 48% and 265 mW, respectively, have been achieved at 2050 nm from a Tm,Ho:NaY(WO(4))(2) crystal. Tuning from 1830 nm to 2080 nm has also been obtained using an intracavity Lyot filter.


Assuntos
Lasers de Estado Sólido , Desenho de Equipamento , Análise de Falha de Equipamento
5.
Opt Express ; 15(26): 18162-7, 2007 Dec 24.
Artigo em Inglês | MEDLINE | ID: mdl-19551114

RESUMO

A new strategy has been developed to enhance the optical bandwidths of rare earth dopants by partial substitution of the divalent cation (D) in the original DWO(4) or DMoO(4) crystal structures. For demonstration, the monoclinic (space group C2/c) Yb-doped Li(0.75)Gd(0.75)Ba(0.5)(MoO(4))(2) crystal was grown in a Li(2)Mo(2)O(7) flux, and 300 K Yb(3+) laser operation is reported. The laser emission is characterized by rather short wavelengths related to the specific features of the absorption and emission spectra, which leads to very small quantum defect, i.e., as low as 0.7% for E//b-axis. Using a Ti:sapphire laser at 976.6 nm, up to 295 mW of cw power are obtained without special cooling while the tunability range extends over 33 nm around 1020 nm.


Assuntos
Cristalização/métodos , Lasers , Lítio/química , Desenho Assistido por Computador , Desenho de Equipamento , Análise de Falha de Equipamento , Lítio/efeitos da radiação , Teoria Quântica , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
6.
Opt Express ; 12(22): 5362-7, 2004 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-19484097

RESUMO

Lasing of Yb3+ in a disordered single crystal host, NaGd(WO4)2, is reported. Pump efficiencies as high as 20% and slope efficiencies as high as 30% are achieved for both sigma- and pi-polarizations with Ti:sapphire laser pumping. The emission of Yb:NaGd(WO4)2 is centered near 1030 nm. Tunability between 1016 and 1049 nm is obtained with a Lyot filter.

10.
Phys Rev B Condens Matter ; 33(6): 4283-4288, 1986 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-9938858
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