TY - JOUR
T1 - Birefringence measurements by an electro-optic modulator using a new heterodyne scheme
AU - Lo, Yu Lung
AU - Hsu, Ping Feng
N1 - Funding Information:
This work has been partially supported by the National Science Council Grant No. NSC 89-2212-E-006-016 to National Cheng Kung University, Tainan, Taiwan.
PY - 2002/11
Y1 - 2002/11
N2 - A new method for measuring changes in birefringence (or retardation) by modulating an electro-optic (EO) modulator in a sinewave signal is developed in a common-path interferometer (polarimeter). The standard heterodyne signal, therefore, can be formed with a new heterodyne scheme, and subsequently the phase shift regarding to changes in birefringence is demodulated by a lock-in amplifier or phase meter. As compared to the conventional techniques, this technique supplies an easier setup, wider modulated frequency, and therefore, a wider frequency response in a sensing system. Finally, the birefringence measurement based on an EO modulator and a new heterodyne scheme in a common-path interferometer is first demonstrated.
AB - A new method for measuring changes in birefringence (or retardation) by modulating an electro-optic (EO) modulator in a sinewave signal is developed in a common-path interferometer (polarimeter). The standard heterodyne signal, therefore, can be formed with a new heterodyne scheme, and subsequently the phase shift regarding to changes in birefringence is demodulated by a lock-in amplifier or phase meter. As compared to the conventional techniques, this technique supplies an easier setup, wider modulated frequency, and therefore, a wider frequency response in a sensing system. Finally, the birefringence measurement based on an EO modulator and a new heterodyne scheme in a common-path interferometer is first demonstrated.
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U2 - 10.1117/1.1512908
DO - 10.1117/1.1512908
M3 - Article
AN - SCOPUS:0036865265
SN - 0091-3286
VL - 41
SP - 2764
EP - 2767
JO - Optical Engineering
JF - Optical Engineering
IS - 11
ER -