Open Access
Table 1
Parameters and values of the system.
| Notation | Values | Parameters |
|---|---|---|
| Et | 400–3000 mJ | Laser single-pulse energy, generally using 400 mJ |
| ft | 100 Hz | Laser repetition rate, laser power is 40–300 W |
| wp | 6.7 ns | Laser pulse width |
| hν | hc/λ, λ = 1064 nm | Photon energy, λ is laser wavelength |
| ηt | 0.60 | Transmitting optical system efficiency |
| θd | 3″ | Gaussian beam divergence half angle |
| θp | 2″ | Laser beam pointing error |
| θj | 2″ | RMS (Root Mean Square) tracking mount jitter |
| Ar | π(d/2)2, d = 1.2 m | Telescope receive area |
| ηr | 0.40 | Receiving optical system efficiency |
| ηc | ~32% @ 2 × 2, ~80% @ 4 × 4 | Detection efficiency, ~10% @ each pixel |
| τ | ~200 ps | Detector response time |
| trt | ~500 ns | Recovery time |
| ndcr | <1 kHz/pixel | Dark count rate |
| Ta | 0.60 | One way atmospheric transmission |
| Tc | 1.00 | One way cirrus cloud transmission |
| θr | 10″ | Receiving view angle |
| q | 10 nm | Bandwidth of filter |
| Nn | ~3.4 × 1019 | Sky brightness of moonless night, unit: cps/(m2 × steradian) |
| Nt | ~1023 | Target brightness, unit: cps/(m2 × steradian) |
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