Table 5.
Light sources and probing methods for non-contact detection of the photoacoustic signal. PRR, pulse repetition rate.
| Light source | Probing method | PRR of the excitation source | Bandwidth of detector | Sampling rate | Number of average | Z-scan required | Ref. |
|---|---|---|---|---|---|---|---|
| Broadband source | Homodyne | 40 Hz | 75 MHz | 200 Ms/s | 10 | No | [141] |
| Non-interferometric | 600 kHz | 150 MHz | 200 Ms/s | 1 | Yes | [139] | |
| Narrow-linewidth source | Homodyne | 1 kHz | 100 MHz | 200 Ms/s | 1 | No | [143] |
| Heterodyne | 20 Hz | 350 MHz | 100 Ms/s | 30 | No | [147] | |
| Swept-source | Homodyne | 5 kHz | 150 MHz | 250 Ms/s | 200 | No | [150] |