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We report on the design and evaluation of a low-cost versatile optical sensor system to detect explosive traces by fluorescence quenching. In comparison to common detection systems, it allows to rapidly sample sensor arrays in various analyte carriers. Moreover, our work enables system development towards low-cost analysis and sensor testing solutions due to the simplicity of the approach. Therefore,...
Non-linear bio-molecular imaging is a growing field with a strong demand for high power lasers. Especially two-photon excited fluorescence (TPEF) microscopy is a very promising and already widely applied imaging modality. The work horses for two-photon excitation are currently ultra-short pulse Ti:Sa lasers [1]. As these lasers tend to be bulky, expensive, and often not fiber compatible, there is...
A hyperspectral stimulated Raman microscopy system using rapidly wavelength swept lasers is presented. Imaging of biological samples with shot noise limited detection is demonstrated with the fiber based setup.
A fast all fiber based setup for stimulated Raman spectroscopy with a rapidly wavelength swept cw-laser is presented. It enables flexible acquisition of broadband (750 cm−1 to 3150 cm−1) spectra with high resolution (0.5 cm−1).
Fourier domain mode locked lasers (FDML)[1] are very rapidly wavelength swept lasers where a narrowband optical bandpass filter is driven synchronously to the round-trip time of light in the resonator providing narrow instantaneous linewidths (∼50pm) over a large wavelength sweep range (∼100nm) at sweep repetition rates of ∼20kHz-5MHz[2]. In biomedical imaging, FDML lasers currently are the light...
An all fiber based system for high speed, high resolution Raman sensing is presented. The system is based on a wavelength swept Fourier Domain Mode Locked (FDML) laser for the detection of the Raman signal.
An all fiber based system for high speed, high resolution Raman sensing is presented. The system is based on a wavelength swept Fourier Domain Mode Locked (FDML) laser for the detection of the Raman signal.
We present a Fourier domain mode locked laser at 1.6 MHz scan rate with greatly improved coherence length by reducing the laser cavity dispersion and the application of this laser in optical coherence tomography.
We present a comparison between theory and experiment for the generation of short pulses from FDML lasers. The theory predicts that in the future bandwidth limited pulse might be possible.
The recently developed Fourier Domain Mode Locked lasers (FDML) [1] are very rapidly wavelength swept light sources, where a narrowband optical bandpass filter is driven resonantly to the round-trip time of light in the resonator, providing small instantaneous linewidths (∼50pm) over a large wavelength sweep range (∼100nm) at sweep repetition rates of ∼20kHz–5MHz [2]. In biomedical imaging, FDML lasers...
A novel Fourier-domain mode locked (FDML) laser design is presented, yielding the highest wavelength sweep speed reported so far around 1050nm. This enables retinal imaging over a ∼70° ultra-wide field of view.
We theoretically and experimentally investigate the instantaneous linewidth of Fourier domain mode-locked lasers, yielding good agreement. Based on simulations, strategies are discussed to drastically reduce the laser linewidth.
We report on a Fourier Domain Mode Locked wavelength swept laser source with a highly linear time-frequency sweep characteristic and demonstrate OCT imaging without k-space resampling prior to Fourier transformation with this source.
We present a theoretical model for the recently developed Fourier domain mode locked (FDML) lasers. The good agreement with experiment provides valuable insights into the mechanism of FDML operation.
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