Title :
Wide tunable laser with noise suppression for precise cavity length measurement
Author :
Smid, Radek ; Cizek, Martin ; Mikel, Bretislav ; Hrabina, Jan ; Lazar, Josef ; Cip, Ondrej
Author_Institution :
Inst. of Sci. Instrum., Brno, Czech Republic
Abstract :
We present a method to measure precisely absolute distance between mirrors of Fabry-Perot cavity (FPC) with a spacer from an ultra low expansion material based on ultra wide tunable laser diode. The laser diode works at 1542 nm with 1 MHz linewidth and 2 nm tunable range. First results with noise suppression was carried out with 3 kHz linewidth laser has been suppressed by -60 dBc/Hz at 10 kHz by unbalanced heterodyne fiber interferometer while the tunability range stayed untouched. This way we were able to reach 10-10 uncertainty corresponding to 10 fm with wide tunable range of 100s of GHz corresponding to 1000 nm distance changes. The precision is ensured by referencing to stabilized optical frequency comb.
Keywords :
Fabry-Perot interferometers; distributed feedback lasers; heterodyne detection; laser cavity resonators; laser mirrors; length measurement; semiconductor lasers; Fabry-Perot cavity; frequency 1 MHz; frequency 10 kHz; noise suppression; optical frequency comb; precise cavity length measurement; time 100 s; ultrawide tunable laser diode; unbalanced heterodyne fiber interferometer; wavelength 1542 nm; Cavity resonators; Fiber lasers; Laser noise; Measurement by laser beam; Optical interferometry; Semiconductor lasers; Fabry-Perot cavity; Fiber Interferometer; Noise supression; optical frequency comb;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898530
