Virtual Journal of Laser

Haiyi Sun, Jiansheng Liu, Cheng Wang, Jingjing Ju, Zhanxin Wang, Wentao Wang, Xiaochun Ge, Chuang Li, See Leang Chin, Ruxin Li, Zhizhan Xu
We numerically simulated the air-flow motion in a diffusion cloud chamber induced by femtosecond laser filaments for different chopping rates. A two dimensional model was employed, where the laser filaments were treated as a heat flux source. The simulated patterns of flow fields and maximum ... [Opt. Express 21, 9255-9266 (2013)]

Irshaad Fatadin, David Ives, Seb J. Savory
The performance of a differential carrier phase recovery algorithm is investigated for the quadrature phase shift keying (QPSK) modulation format with an integrated tunable laser. The phase noise of the widely-tunable laser measured using a digital coherent receiver is shown to exhibit significant ... [Opt. Express 21, 10166-10171 (2013)]

A. Miguel, J. Azkargorta, R. Morea, I. Iparraguirre, J. Gonzalo, J. Fernandez, R. Balda
In this work we present, for the first time to our knowledge, laser emission under wavelength selective laser-pulsed pumping in Nd^3+-doped TeO_2-ZnO-ZnF_2 bulk glass for two different Nd^3+ concentrations. The fluorescence properties of Nd^3+ ions in this matrix which include, Judd-Ofelt ... [Opt. Express 21, 9298-9307 (2013)]

Zhi-Chao Luo, Qiu-Yi Ning, Hai-Lan Mo, Hu Cui, Jin Liu, Li-Jun Wu, Ai-Ping Luo, Wen-Cheng Xu
We report on the vector nature of rectangular pulse operating in dissipative soliton resonance (DSR) region in a passively mode-locked fiber laser. Apart from the typical signatures of DSR, the rectangular pulse trapping of two polarization components centered at different wavelengths was observed ... [Opt. Express 21, 10199-10204 (2013)]

Masaya Sato, Shin Kajita, Ryo Yasuhara, Noriyasu Ohno, Masayuki Tokitani, Naoaki Yoshida, Yuzuru Tawara
Multi-pulse laser-induced damage threshold (LIDT) was experimentally investigated up to ~10^6 pulses for Cu, Ag mirrors. The surface roughness and the hardness dependence on the LIDT were also examined. The LIDT of OFHC-Cu decreased with the pulse number and was 1.0 J/cm^2 at 1.8 × 10^6 ... [Opt. Express 21, 9333-9342 (2013)]

Wei-Hua Guo, Qiaoyin Lu, Marta Nawrocka, Azat Abdullaev, James O’Callaghan, John F. Donegan
A 9-channel wavelength tunable single-mode laser array based on slots is presented. The fabricated laser array demonstrated a threshold current in a range of 19~21 mA with the SOA unbiased at 20°C under continuous wave condition. Stable single mode performances have been observed with ... [Opt. Express 21, 10215-10221 (2013)]

Junhai Liu, Qibiao Dai, Yong Wan, Wenjuan Han, Xueping Tian
The passive Q-switching laser performance of Yb:YCa_4O(BO_3)_3 is studied with crystals cut along the principal optical axes. Using a Cr^4+:YAG saturable absorber with initial transmission of 93.7% and an output coupler of transmission of 40%, efficient Q-switched laser operation is achieved with a ... [Opt. Express 21, 9365-9376 (2013)]

Simian Li, Dong Zhou, Ting Wen, Weilin Zhu, Zhitang Song, Tianshu Lai
Femtosecond laser-irradiation-induced phase change of a new amorphous Si_2Sb_2Te_3 film with a good thermal stability and low reset current is studied by coherent phonon spectroscopy. New coherent optical phonons (COP) occur as laser irradiation fluence reaches some threshold, implying ... [Opt. Express 21, 10222-10227 (2013)]

Zuofei Hong, Qingbin Zhang, Peixiang Lu
A novel compact dual-crystal optical parametric amplification (DOPA) scheme, collinearly pumped by a Ti:sapphire laser (0.8 μm), is theoretically investigated for efficiently generating broadband IR pulses at non-degenerate wavelengths (1.2 μm∼1.4 μm and 1.8 ... [Opt. Express 21, 9491-9504 (2013)]

L. Rodríguez-Cobo, M. A. Quintela, S. Rota-Rodrigo, M. López-Amo, J. M. López-Higuera
A narrow filtering technique based on the spectral overlapping of two uniform FBGs and applied to obtain a Single Longitudinal Mode (SLM) laser is proposed and demonstrated in this work. The two FBGs are spectrally detuned to reduce their coincident reflection response narrowing the equivalent ... [Opt. Express 21, 10289-10294 (2013)]