Fiber interferometer for simultaneous multiwavelength phase measurement with a broadband femtosecond laser.
We present a fiber interferometer for the simultaneous measurement of phase at multiple wavelengths from a single broadband femtosecond laser. Narrow-bandwidth fiber Bragg gratings isolate a particular frequency from the broad-bandwidth laser pulse produced. The multiwavelength phase data permit the unambiguous measurement range to be significantly increased compared with the wavelengths used in the interferometer. Preliminary experimental results are presented for a two-frequency sensor with an absolute range of 0.13 mm and associated dynamic range of 43,000:1.
Towers
Catherine E
CE
School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK. c.towers@hw.ac.uk
Towers
David P
DP
Reid
Derryck T
DT
MacPherson
William N
WN
Maier
Robert R J
RR
Jones
Julian D C
JD