Fig. 1. Overall program design of optical micro-cavity spectral signal acquisition system

Fig. 2. Architecture of DAQ-2204

Fig. 3. Overall software architecture of optical micro-cavity spectral signal acquisition system

Fig. 4. Acquisition workflow chart of optical micro-cavity spectral signal acquisition system

Fig. 5. Basic function test results of optical micro-cavity spectral signal acquisition system. (a) Triangular wave acquired under RSE;(b) triangular wave acquired under NRSE; (c) triangular wave acquired under differential

Fig. 6. Stability test results of acquisition system. (a) Wave peak value as a function of time; (b) Allan variance of wave peak value varying with time

Fig. 7. Experimental system of optical micro-cavity spectral signal acquisition

Fig. 8. Results of spectral signal acquisition of fiber microsphere cavity. (a) Transmission spectrum of microsphere cavity; (b) top view of microsphere cavity when it is coupled; (c) first-order radial and first-order angular electric field pattern in meridional plane of microsphere cavity; (d) second-order radial and second-order angular electric field pattern in meridional plane of microsphere cavity; (e) Lorenz fit of mode which is pointed to with arrow in Fig. 8(a); (f) waveform frequency drift curve at lowest point of mode in Fig. 8(e)

Fig. 9. Results of experimental comparison. (a) Side view of silica microdisk cavity; (b) surface view of microdisk cavity under high magnification microscope; (c) internal mode distribution of microdisk cavity; (d) transmittance spectrum acquired by oscilloscope; (e)(f) Q-value analysis of transmission spectra acquired by oscilloscope; (g) transmission spectrum acquired by acquisition system; (h)(i) Q-factor analysis of transmission spectra collected by acquisition system