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The low-k dielectric materials in wafer fabrication are widely used. The current advanced mechanical dicing is not able to meet the requirement of low-k technology, since the low-k materials are harder and brittle. Laser dicing is developed for low-k wafer dicing. There are various laser dicing techniques in the market. Depending on the wafer thickness, laser dicing can either be a though cut or a...
Light Emitting Diode (LED) has been developing rapidly in recent years because of its various characteristics, such as small size, long life, high brightness, low calorific power and so on. But the poor efficiency of light extraction is the major factor which constrains the development of LED. The two-dimensional (2D) photonic crystals (PhCs) are very suitable for improving the efficiency of light...
A compact, portable rubidium atomic beam clock based on lamp pumped and fluorescence detection scheme is proposed. The expected short-term frequency stability can be more than two orders of magnitude better than previous experimental results. The usages of lamp pumping, fluorescence detection and microwave slow-wave resonance structures make this design robust and compact. The shortcomings will be...
In this paper we report our design and experimental results towards demonstration of a magneto optical trap (MOT)-based cold Cs-beam atomic clock. We generated a continuous cold Cs beam from a Cs MOT by perturbing the MOT potential and measured the longitudinal velocity of the Cs beam to be 7 m/s. In order to separate the atomic beam from the MOT laser beam, we used a one-dimensional optical molasses...
A new plasmonic bowtie nanolaser structure is fabricated where a semiconductor gain core is enclosed by a metal shell with bowtie cross section built-in. Light emission characteristics under electrical injection will be reported.
We systematically characterized semiconductor-metal core-shell plasmonic nanolasers of various sizes and shapes under electrical injection. New experimental results will be presented including detailed temperature-dependent and duty cycle dependent performance measurements, as well as polarization measurements.
In this scheme, nonlinearity and dispersion in the NDF lead to various reshaping processes of an initial, conventional pulse according to the chirping value and power level at the input of the fibre. In particular, we have observed that triangular-shaped pulses can be generated for sufficiently high energies and a positive initial chirp parameter. In our experiments, 2.8 ps-FWHM, transform-limited...
Phase-locking and coherent beam combination of two individual double-clad fibre lasers by a novel extra-cavity mutual injection-locking method are proposed and experimentally demonstrated. Steady interference stripes with high contrast ratio (about 0.5) are observed. The output power of the phase-locked array exceeds 11 W and the power-combining efficiency is about 80%. No power-restriction optical...
An index-coupled distributed feedback laser with the sampled grating has been designed and fabricated. The +1st order reflection of the sampled grating is utilized for laser single mode operation, which is 1.5329 mum in the experiment. The sampled grating is formed by a conventional holographic exposure combined with the usual photolithography. The typical threshold current of DFB laser with the sampled...
1.3 mum QD SOAs are shown to provide 19 dB optical gain at temperatures up to 70 degC, allowing < 0.1 dB system penalty at 10 Gb/s. The gain is constant to within plusmn 3.5 dB from 20degC-70degC for 10 nm spectral bandwidth.
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