Table 1.
Characteristics of sample microendoscope probes
| Microendoscope type | Diameter (mm) | Length (mm) | Usable field of view (µm) | Lateral magnification) (×) | Two-photon lateral resolution (FWHM, µm) | NA |
|---|---|---|---|---|---|---|
| Doublet (0.75/0.21 pitch) | 1.0 | 20.6 | 275 | 2.52 | 0.9 | 0.49 |
| Doublet (1.25/0.19 pitch) | 0.5 | 16.4 | 130 | 2.48 | 1.0 | 0.48 |
| Doublet (1.75/0.16 pitch) | 0.35 | 15.8 | 75 | 2.69 | 1.2 | 0.45 |
| Singlet (0.46 pitch) | 1.0 | 4.4 | 700 | 0.97 | 0.9 | 0.49 |
| Singlet (0.94 pitch) | 0.5 | 4.3 | 350 | 0.92 | 1.0 | 0.47 |
| GRIN/plano-convex doublet (BK7 plano-convex lens) | 1.0 | 3.7 | 120 | 1.41 | 0.8 | 0.65 |
| GRIN/plano-convex doublet (LaSFN9 plano-convex lens) | 1.0 | 4.0 | 75 | 1.86 | 0.6 | 0.82 |
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To facilitate comparisons between parameter values, each microendoscope listed has an optical working distance of 250 µm. The lateral resolution of two-photon imaging is given for 920-nm illumination.
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FWHM, full width at half-maximum; NA, numerical aperture; GRIN, gradient refractive index.
