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Spontaneous subpicosecond pulse formation with pulse repetition rate of 80 GHz in a diode-pumped Nd:SrGdGa_3O_7 disordered crystal laser
Y. F. Chen, H. C. Liang, J. C. Tung, K. W. Su, Y. Y. Zhang, H. J. Zhang, H. H. Yu, J. Y. Wang
We explore the operation of spontaneous mode locking in a diode-pumped Nd:SrGdGa_3O_7 disordered crystal laser. The first- and second-order autocorrelations are simultaneously performed to evaluate the temporal characteristics. An 80 GHz pulse train with a pulse duration as short as 616 fs is ... [Opt. Lett. 37, 461-463 (2012)]
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Low-threshold single-wavelength all-fiber laser generating cylindrical vector beams using a few-mode fiber Bragg grating
Biao Sun, Anting Wang, Lixin Xu, Chun Gu, Zhongxi Lin, Hai Ming, Qiwen Zhan
We propose and demonstrate a low-threshold single-wavelength all-fiber laser generating cylindrical vector beams using a few-mode fiber Bragg grating. Both radially and azimuthally polarized beams have been generated with very good modal symmetry and polarization purity higher than 94%. The ... [Opt. Lett. 37, 464-466 (2012)]
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Polarization phase-shifting Newton interferometer for plane optical surface measurements
Shyh-Tsong Lin, Liang-Chia Chen, Sheng-Lih Yeh, Hu?ng-Xuân Trinh, Hung-Pin Chen
This Letter introduces a polarization phase-shifting Newton interferometer that can be utilized for plane optical surface measurements, a setup constructed to realize the interferometer, and the experimental results from the use of the setup. The results confirm not only the validity but also the ... [Opt. Lett. 37, 467-469 (2012)]
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Adaptive slit beam shaping for direct laser written waveguides
P. S. Salter, A. Jesacher, J. B. Spring, B. J. Metcalf, N. Thomas-Peter, R. D. Simmonds, N. K. Langford, I. A. Walmsley, M. J. Booth
We demonstrate an improved method for fabricating optical waveguides in bulk materials by means of femtosecond laser writing. We use an LC spatial light modulator (SLM) to shape the beam focus by generating adaptive slit illumination in the pupil of the objective lens. A diffraction grating is ... [Opt. Lett. 37, 470-472 (2012)]
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Image formation in CARS and SRS: effect of an inhomogeneous nonresonant background medium
K. I. Popov, A. F. Pegoraro, A. Stolow, L. Ramunno
We investigate the role of a spatially inhomogenous nonresonant background medium on several Raman-based imaging modalities. In particular, we consider a small resonant bead submerged in a spatially heterogeneous nonresonant ?^(3) background. Using detailed 3D electrodynamic simulations, we ... [Opt. Lett. 37, 473-475 (2012)]
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Cascaded frequency upconversion for high-speed single-photon detection at 1550 nm
J. S. Pelc, Q. Zhang, C. R. Phillips, L. Yu, Y. Yamamoto, M. M. Fejer
We present a device for two-stage frequency upconversion of single-photon-level signals in the 1.55 ?m telecom band to the green spectral region with low excess noise, suitable for detection by low-timing-jitter silicon single-photon avalanche photodiodes (APDs). We achieve a net conversion ... [Opt. Lett. 37, 476-478 (2012)]
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Characterization of a photonic strain sensor in silicon-on-insulator technology
Wouter J. Westerveld, Jose Pozo, Peter J. Harmsma, Ruud Schmits, Erik Tabak, Teun C. van den Dool, Suzanne M. Leinders, Koen W.A. van Dongen, H. Paul Urbach, Mirvais Yousefi
Recently there has been growing interest in sensing by means of optical microring resonators in photonic integrated circuits that are fabricated in silicon-on-insulator (SOI) technology. Taillaert et al. [Proc. SPIE6619, 661914 (2007)PSISDG0277-786X10.1117/12.738412] proposed the use of a ... [Opt. Lett. 37, 479-481 (2012)]
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The role of self-trapped excitons and defects in the formation of nanogratings in fused silica
Sören Richter, Fei Jia, Matthias Heinrich, Sven Döring, Ulf Peschel, Andreas Tünnermann, Stefan Nolte
We investigate the role of self-trapped excitons (STEs) and defects in the formation of femtosecond laser pulse induced nanogratings (NGs) in fused silica. Our experiments reveal strongly enhanced NG formation for pulse separations up to the STE lifetime. In addition, the absorption spectra show ... [Opt. Lett. 37, 482-484 (2012)]
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Anderson localization in a periodic photonic lattice with a disordered boundary
U. Naether, J. M. Meyer, S. Stützer, A. Tünnermann, S. Nolte, M. I. Molina, A. Szameit
We investigate experimentally the light evolution inside a two-dimensional finite periodic array of weakly coupled optical waveguides with a disordered boundary. For a completely localized initial condition away from the surface, we find that the disordered boundary induces an asymptotic ... [Opt. Lett. 37, 485-487 (2012)]
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Photonic crystal nanocavity laser in an optically very thick slab
Se-Heon Kim, Jingqing Huang, Axel Scherer
A photonic crystal (PhC) nanocavity formed in an optically very thick slab can support reasonably high-Q modes for lasing. Experimentally, we demonstrate room-temperature pulsed lasing operation from the PhC dipole mode emitting at 1324 nm, which is fabricated in an InGaAsP slab with thickness (T) ... [Opt. Lett. 37, 488-490 (2012)]
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