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27 results on '"Fischer, U.H.P."'

4. Absorption spectra of excited Kr 84 states between 1.5 and 1.58 mu m and their use for absolute frequency locking

Author

Fischer, U.H.P., Helmolt, C. von, and Publica

Subjects
laser noise, measurement standards, opto-galvanic effect, absorption spectra, laser frequency stability, atomic clocks, absolute frequency locking, infrared spectra, laser mode locking, 1.5 to 1.58 mum, optogalvanic spectra, kr, galvatron signal, excited kr 84 states, kr 1s2-2p8, galvatron tube, 1547.825 nm, excited states, krypton
Abstract

We have shown to our knowledge for the first time the absorption spectrum of Kr between 1500 and 1580 nm via the opto-galvanic effect and we measured the stability of a laser locked to the absorption line of Kr 1s2-2p8 at 1547.825 nm. The noise of the Galvatron signal as a function of the current through the bulb was carried out. Additionally it was shown to our knowledge for the first time that is it possible to lock more than one laser simultaneously at different wavelengths to one Galvatron tube.

Published
1996

5. Engineered, rack-mounted, optical reference unit at 1547.825 nm

Author

Fischer, U.H.P., Helmolt, C. von, and Publica

Subjects
optical fibre communication, measurement standards, laser frequency stability, optical reference unit, rack-mounted, wavelength division multiplexing, 1547.825 nm, krypton
Abstract

An optical reference unit at 1547.825 nm was built in a rack-mounted engineered design. A frequency stability of better than 10-9 (100 kHz) was reached.

Published
1994

6. Scanning heterodyne spectrometer with different local oscillator laser types

Author

Fischer, U.H.P., Helmolt, C. von, and Publica

Subjects
optical modulation, spectrometers, output power, optical communication equipment, scanning heterodyne spectrometer, semiconductor lasers, demodulation, local oscillator laser, driving conditions, tuning range, tunable laser diodes, spectral line breadth, linewidth, laser tuning, 1.55 mum
Abstract

Three different types of tunable laser diodes for use in a scanning heterodyne spectrometer at 1.55 mu m were examined. Typical criteria like linewidth, tuning range, driving conditions and output power were measured and compared.

Published
1994

7. Engineered automatic control and frequency stabilization unit for a coherent multichannel (CMC) system

Author

Fischer, U.H.P., Helmolt, C. von, Kruger, K., Kruger, U., and Publica

Subjects
cmc system, optical communication equipment, 95 GHz, automatic head-end control unit, multichannel transmitter unit, computerised control, automatic frequency control, frequency stabilization unit, coherent multichannel system, offset locking, gec-marconi, engineered automatic control, caswell, frequency stability, television transmitters, ten channel, multichannel tv system
Abstract

An automatic head-end control unit for a ten channel CMC system was built, tested and shipped to GEC-Marconi, Caswell where it was installed. Absolute frequency stabilization experiments are reported with offset locking of up to 95 GHz.

Published
1994

9. Absolute CMC frequency stabilisation with 0.8 THz control range and OEIC front-end module

Author

Fischer, U.H.P., Helmolt, C. von, Kruger, K., Kruger, U., and Publica

Subjects
optogalvanic reference, coherent multicarrier, frequency stabilisation, polarisation diversity detector hybrid, heterodyne spectrometer, front-end module, 800 GHz, optical links, frequency stability, oeic, integrated optoelectronics, 1547.825 nm
Abstract

Absolute coherent multicarrier (CMC) frequency stabilisation experiments are reported featuring an optogalvanic reference at 1547.825 nm, an offset locking range of 800 GHz with 0.4 GHz resolution and a balanced InP polarisation diversity detector hybrid.

Published
1992

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