This paper will present fiber laser cutting results in stainless steel using a PSO enabled motion system. The objective for this work is to minimize the HAZ and heat distortion during laser micro machining.
Vaporization of explosives is done at 1.5 μm and the vapor is analyzed for NO emission by MIR laser spectroscopy. The ratio of NO/NO2 is an indicator to distinguish between energetic and non-energetic materials.
The infrared real-time temperature measure by a PbSe sensor with high spatial resolution via aspheric optics has been exploited to control temperature-sensitive material microprocessing. Applications in the range from 370 K to 800 K has been discussed.
A fiber coupled LIBS system is used for detection of mines and explosives. Laser excitation at 1.5 mum is preferred to generate LIBS signals using an Er:glass microchip laser as seed laser for an Yb:Er fiber amplifier.
Reliability and lifetime of quasi-CW laser diode arrays are greatly influenced by their thermal characteristics. This paper examines the thermal properties of laser diode arrays operating in long pulse duration regime.
Localized and propagating surface plasmon dynamics in Ag films are imaged by time-resolved photoemission electron microscopy with <10 fs time and d~40 nm spatial resolution. Movies of plasmon dephasing are recorded with 330 as/frame rate.
We present a diode laser concept for precision spectroscopy which is based on a novel optical feedback scheme that combines excellent frequency stability (< 35 kHz line width in 290 ms) with good tuneability (45 GHz continuously, 50 nm overall).
A compact sensor for physically sorting bio-aerosols based on fluorescence spectra excited using UV-LED arrays is presented. The optical system integrates electronics for real-time processing of spectral data and a miniaturized aerodynamic deflector for particle separation.
The dynamics of an ensemble of cold excitons created by two-photon resonant excitation is examined by mid-infrared pump-probe spectroscopy. Lyman transitions from the 1s to n-p states of ortho and para-excitons are probed in Cu2O.
Most people are familiar with the use of lasers for drilling inkjet nozzles. This presentation will give insight to the many applications where lasers are used for inkjet manufacturing, including uses for new products.
We describe a standoff sensor for monitoring, from above 3,000 m, the natural gas transmission pipeline infrastructure. Using an EDFA, the sensor amplifies the tunable diode laser beam from a Wavelength Modulation Spectroscopy platform.
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
We directly observed an attosecond pulse train and an envelope with mode-resolved autocorrelation signals of above-threshold ionization spectra of photoelectrons excited by multiple order harmonics, resulting that the pulse width in the train should be 450 as.
We describe a principal component analysis (PCA) of bio-aerosols which incorporates both fluorescence excitation-emission data over the excitation range 210 nm - 600 nm and lifetime data. The analysis suggests a useful separation metric based on spectral angle.
Laser micro-processing techniques are becoming commonplace in the industrial production of high-tech devices. As the limit of conventional manufacturing is reached, laser micro-processing presents itself as an enabling technology in a wide range of applications.
Cleaving of brittle materials is a non-ablating high potential process based on thermal-induced-stress. Amorphous materials such as glass can be separated as well as crystalline structures using near-infrared laser radiation and multiple absorption technology.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.