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A novel all-electronic scheme for real-time measurement and stabilization of the carrier-envelope phase of kHz pulse trains is demonstrated, revealing new insight into the pulse-to-pulse phase fluctuations of such lasers.
We report on a low-noise diode laser system for coherent precision spectroscopy of individual ro-vibrational molecular states. A 10 fold reduction of frequency-noise of our diode laser with respect to grating stabilized diode lasers is presented.
We present a simple, compact, microfluidic system that easily facilitates diode laser bar optical trapping for cell stretching measurements and particle sorting within flowing microfluidic systems for the first time.
We present a method using either laser or white evanescent illumination combined to spatial modulation and camera lock-in detection allowing the measurement of scattering images and spectra of individual gold nanoparticles.
We obtain the complex refractive index of ultra-thin gold film (down to 20 picometers) on thermal oxide on silicon by the combination of in-line (IL) and differential-phase-contrast (DPC) channels of spinning-disc interferometry (SDI).
A fiber-coupled difference frequency generation laser spectrometer for measuring isotopic compositions of N2O at trace concentrations is presented. Using wavelength modulation 90/00 precision at 100 ppm is achieved. The accuracy is demonstrated with enriched samples.
A three-dimensional Sagnac interferometer based on geometric phase is constructed and its nulling characteristics are measured to be 5E-5 for green and red laser light simultaneously.
A pulsed fibre lidar based on 1.5 mum fibre technology has been demonstrated for wake vortex monitoring on airport sites. The wake vortex cores position resolution is plusmn2 m, the error on circulation 10%.
We coherently probe a quantum dot, strongly coupled to a photonic crystal nano-cavity, using a resonant laser beam. At higher pump power, the coupled systempsilas response becomes highly nonlinear. This coherent probing method has applications for classical and quantum information processing.
We present a multiwavelength, time-division multiplexed laser that continuously cycles through 10 stable, tunable and spectrally narrow wavelengths at 30 kHz for absorption measurements in the R-branch of the v1+n3 band of H2O (1330-1380 nm).
The Mie scattering of a Laguerre-Gaussian beam is studied. Applications to position detection in optical tweezers are considered. The cross-talk between the position signals predicted by simulations is confirmed in experiments.
High-speed 3-dimensional measurement system is demonstrated using electronically controlled wavelength-tunable ultrashort pulse fiber laser and fiber interferometer. Clear images of metallic samples are obtained from a few meter long distance at speed of 1,000 points/s.
Interferometer for precise refractive-index measurement of glass-prism without prior knowledge is developed using a direct comparison of optical-path-changes in glass and air. Preliminary result shows uncertainty of 4.4 x 10-5 agreeing with the manufacturerpsilas values.
We report high precision refractive indices measurement of air and its constitute gases using an unbalanced Mach-Zehnder interferometer with frequency combs. Our experiments demonstrate sensitivities in levels of 10-9.
A simple method for fast optical spectroscopy with high resolution is shown. The method is based on the narrowband Brillouin gain process in optical fibers.
We demonstrate experimentally a new kind of laser microphone using a highly sensitive pulsed laser vibrometer. By using the photo-electromotive-force (photo-EMF) sensors, we present data indicating the real-time detection of surface displacements as small as 4 pm.
We report a strong reduction of nonlinear interactions in a solid-state ring laser gyroscope when the gain medium is vibrated inside the cavity. This considerably improves the quality of rotation sensing for this device.
We present a visible VCSEL with integrated beam splitter. By focusing one beam onto a moving target and monitoring the power variation in the second beam, these devices can be used as Doppler-based velocity sensors.
As an unique terahertz application, we have been developing a laser terahertz emission microscope (LTEM) for not only a study of basic science but also industrial application such as an inspection tool for semiconductor integrated circuits. In order to establish high resolution system, we employed a high-refractive solid immersion lens and a beam expander in LTEM system, by which a focused beam spot...
Quantum cascade laser is coupled into Hollow Waveguide as an inline sensor after GC separation. We show the sensor has high ppbV sensitivity for carbon and other species, yet maintaining the GC peaks.
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