Analytical and experimental study of ringing effects in a Fabry–Perot cavity Application to the measurement of high finesses

Spherical whispering‐gallery‐mode microresonators

“…It has been shown that a fast sweeping of the cavity resonance or of the excitation wavelength induces a ringing phenomenon (as in cavity ring down spectroscopy) [79][80][81][82]. This can be exploited to easily measure ultrahigh loaded factors avoiding stationary technique drawbacks for high-finesse resonators [83][84][85][86] or whispering-gallery mode (WGM) resonators [49,87]. A www.lpr-journal.org part of the light is accumulated first and then re-emitted, thus interfering with the laser light and generating a beatnote signal like the one shown in Fig.…”

High-sensitivity, large dynamic range, auto-calibration methane optical sensor using a short confocal Fabry–Perot cavity

“…We added a discrete triangular ramp voltage with a step of 0.05 V and the amplitude of 1.85 V to the piezoelectric transducer (PZT) of the laser by a channel of digital-analog converter (D/A), while the PZT of the cavity was modulated by a continuous triangular waveform all the time, which scanned several free spectral ranges. To make sure the light was effectively injected into the cavity, the frequency of the continuous triangular waveform should be below 50 Hz [30,31]. Every voltage of discrete triangular ramp with respect to a certain laser frequency would be held until the signals of several cavity modes from PD 1 and PD 2 were recorded by a pair of channels of analog-digital converter (A/D).…”

Optical Mini-Disk Resonator Integrated into a Compact Optoelectronic Oscillator

“…Wavelength span is too small to scan a full free spectral range (FSR) and scan rate is 50 Hz. Q factor is measured with a self homodyne method [4]. Oscillation damping gives Q = 3.4 × 10 8 and is given in Fig.…”