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
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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