Optics Letters

Ramsey spectroscopy of bound atomic states with extreme-ultraviolet laser harmonics

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I. Liontos, S. Cavalieri, C. Corsi, R. Eramo, S. Kaziannis, A. Pirri, E. Sali, M. Bellini
We report the experimental measurement of Ramsey interference fringes in the single-photon excitation to a high-lying bound state of atomic argon by pairs of phase-locked, time-delayed, extreme UV high-order-harmonic pulses at 87 nm. High-visibility Ramsey fringes are observed for delays larger ... [Opt. Lett. 35, 832-834 (2010)]

Photonic crystal vertical-cavity surface-emitting lasers with true photonic bandgap

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Krassimir Panajotov, Maciej Dems
By calculating the band diagrams for the distributed Bragg mirrors of vertical-cavity surface-emitting lasers (VCSELs) with triangular two-dimensional lattice of etched holes we show that true photonic bandgap (PBG) confinement is possible for TE-like polarized light. We confirm this true PBG ... [Opt. Lett. 35, 829-831 (2010)]

Ce^3+:YAG double-clad crystal-fiber-based optical coherence tomography on fish cornea

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Chien-Chung Tsai, Ting-Hao Chen, Yen-Sheng Lin, Yu-Ta Wang, Wei Chang, Kuang-Yu Hsu, Yung-Hsin Chang, Po-Kai Hsu, Dong-Yo Jheng, Kuang-Yao Huang, Edmund Sun, Sheng-Lung Huang
A Ce^3+:YAG double-clad crystal fiber (DCF) visible emission was used as the light source for optical coherence tomography (OCT). The visible emission was produced from a 10 μm core DCF pumped by a diode laser. The broadband emission and short central wavelength of this light source enabled ... [Opt. Lett. 35, 811-813 (2010)]

GaN laser self-mixing velocimeter for measuring slow flows

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Russell Kliese, Yah Leng Lim, Thierry Bosch, Aleksandar D. Rakić
The self-mixing (SM) laser sensing technique allows for a simple, self-aligned, and robust system for measuring velocity. Low-cost blue emitting GaN laser diodes have recently become available owing to the high volume requirements for Blu-ray Disc devices such as high-definition video players and ... [Opt. Lett. 35, 814-816 (2010)]

Palm-top-size, 1.5 kW peak-power, and femtosecond (160 fs) diode-pumped mode-locked Yb^+3:KY(WO_4)_2 solid-state laser with a semiconductor saturable absorber mirror

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Shogo Yamazoe, Masaki Katou, Takashi Adachi, Tadashi Kasamatsu
We report a palm-top-size femtosecond diode-pumped mode-locked Yb^+3:KY(WO_4)_2 solid-state laser with a semiconductor saturable absorber mirror utilizing soliton mode locking for shortening the cavity to 50 mm. An average output power of 680 mW and a pulse width of 162 fs were obtained at 1045 nm ... [Opt. Lett. 35, 748-750 (2010)]

Gratings fabrication in benzildimethylketal doped photosensitive polymer optical fibers using 355 nm nanosecond pulsed laser

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Yanhua Luo, Qijin Zhang, Huiyong Liu, Gang-Ding Peng
We report writing polymer optical fiber (POF) gratings in photosensitive POFs doped with benzildimethylketal (BDK) (BPOF in short) using a 355 nm laser for what we believe to be the first time. Both multimode and single-mode FBGs were fabricated with relatively low writing intensity. The enhanced ... [Opt. Lett. 35, 751-753 (2010)]

Double-resonance nanolaser based on coupled slit-hole resonator structures

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Z. H. Zhu, H. Liu, S. M. Wang, W. M. Ye, X. D. Yuan, S. N. Zhu
This work investigates a kind of metallic magnetic cavity based on slit-hole resonators. Two orthogonal hybrid magnetic resonance modes of the cavity with a large spatial overlap are predesigned at the wavelengths of 980 and 1550 nm. The Yb:Er codoped material serving as a gain medium is set in the ... [Opt. Lett. 35, 754-756 (2010)]

Origin of the spectral coherence in dynamically broadened Rabi sidebands

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M. Plewicki, R. Compton, A. Filin, D. A. Romanov, R. J. Levis
We demonstrate the coherent nature of dynamic Rabi-shifted sidebands arising when a picosecond probe laser interacts with a weakly ionized laser-generated microplasma. The coherence is manifested as spectral fringes observed in the sideband spectra. A model is presented that quantitatively predicts ... [Opt. Lett. 35, 778-780 (2010)]

Optically pumped semiconductor quantum dot disk laser operating at 1180 nm

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Jussi Rautiainen, Igor Krestnikov, Mantas Butkus, Edik U. Rafailov, Oleg G. Okhotnikov
We demonstrate an optically pumped semiconductor disk laser using 39 layers of Stranski-Krastanov InGaAs quantum dots self-assembled during epitaxial growth on a monolithic GaAs/AlAs distributed Bragg reflector. The gain structure bonded to an intracavity diamond crystal heat spreader allows 1.75 W ... [Opt. Lett. 35, 694-696 (2010)]

Ge-on-Si laser operating at room temperature

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Jifeng Liu, Xiaochen Sun, Rodolfo Camacho-Aguilera, Lionel C. Kimerling, Jurgen Michel
Monolithic lasers on Si are ideal for high-volume and large-scale electronic-photonic integration. Ge is an interesting candidate owing to its pseudodirect gap properties and compatibility with Si complementary metal oxide semiconductor technology. Recently we have demonstrated room-temperature ... [Opt. Lett. 35, 679-681 (2010)]

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