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We have performed high resolution spectroscopy of rubidium with a single mode continuous wave distributed feedback (DFB) laser diode. The saturation spectrum of the D 2-line of 85 Rb and 87 Rb was recorded with a resolution close to the natural line width. The emission frequency was actively stabilized to Doppler-free transitions with a relative accuracy of(More)
We present difference-frequency stabilization of free-running distributed-feedback (DFB) diode lasers, maintaining a stable phase-lock to a local oscillator (LO) signal. The technique has been applied to coherent hybrid THz imaging which employs a high-power electronic radiation source emitting at 0.62 THz and electro-optic detectors. The THz radiation of(More)
We realized a tunable continuous-wave terahertz source with megahertz frequency resolution. The system is based on optical heterodyning of two near-infrared distributed feedback diode lasers, each laser being stabilized by electronic feedback from a low-finesse quadrature interferometer. The control loop permits precisely linear laser frequency scans over(More)
2-Photon laser scanning microscopy (TPLSM) is often used for chronic in vivo studies. Small deviations in the sample orientation, however, make comparison of three-dimensional image stacks taken at different time-points challenging. When analysing changes of three-dimensional structures over time (4D imaging) this fundamental problem is one of the main(More)
We present an electrooptic (EO) terahertz imaging technique providing a demodulating detector array for phase-sensitive multipixel terahertz detection. The terahertz radiation from a quartz-stabilized microelectronic emitter is mixed with the synchronized laser beat signal of a continuous-wave distributed-feedback diode laser pair. A fast laser current(More)
We report on the frequency doubling of an Erbium-doped master-oscillator power-amplifier system. The fundamental 72 fs pulses at a wavelength of 1.56 μm are frequency doubled to 780 nm and compressed in a Gires-Tournois-interferometer mirror pair to a duration of 55 fs with an average power of 172 mW with an efficiency of 48%. To our knowledge these(More)
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