Precise measurement of the length by means of DFB diode and femtosecond laser

0335085 - ÚPT 2010 RIV US eng C - Conference Paper (international conference)
Šmíd, Radek - Číp, Ondřej - Lazar, Josef - Ježek, Jan - Růžička, Bohdan
Precise measurement of the length by means of DFB diode and femtosecond laser.
Optical Measurement Systems for Industrial Inspection VI. (Proceedings of SPIE Vol. 7389). Bellingham: SPIE, 2009, 739833: 1-7. ISBN 978-0-8194-7672-2. ISSN 0277-786X.
[Optical Measurement Systems for Industrial Inspection /6./. Munich (DE), 14.06.2009-18.06.2009]
R&D Projects: GA ČR GA102/09/1276; GA MŠMT(CZ) LC06007; GA MŠMT 2C06012; GA MPO 2A-1TP1/127; GA MPO FT-TA3/133; GA MPO 2A-3TP1/113; GA ČR GA102/07/1179
Institutional research plan: CEZ:AV0Z20650511
Keywords : Fabry-Perot * femtosecond laser * length etaloa * frequaicy comb
Subject RIV: BH - Optics, Masers, Lasers

Need of precise definition of the calibrated length is of great importance in industrial application in these days. Found DFB diode laser wavelength transmitted through the Fabry-Perot etalon is measured by wavelengthmeter. Train of femtosecond laser pulses produces an optical frequency spectrum (optical comb) of separate equidistant frequencies with an offset frequency. Stabilized optical comb generates a very precise frequency rule. Frequency beat between DFB laser source and the closest femtosecond laser line is detected to find the exact frequency. This procedure is done in whole DFB laser diode tuning range. Such method produce about hundred of reproductive and well defined measured points in DFB laser diode tuning range. Measured points are treated by computer algorithm. Moreover the Fabry-Perot mirror distance changes could be precisely analyzed by this method.
Permanent Link: http://hdl.handle.net/11104/0179657