Table 1 Simulation parameters and their standard nominal values.
From: Improving sodium laser guide star brightness by polarization switching
Variable name (Symbol) | Standard value |
|---|---|
Atomic, atmospheric and mesospheric parameters | |
Geomagnetic field in mesosphere (B) | 0.22750 G |
Average mesospheric temperature (TNa) | 185 K |
Na beam dwell velocity (vγ) | 38 m/s |
Beam atom exchange rate (γex) | 1/(6.0 ms) |
Na–N2 v.c.c.† cross section (σNa−N2) | 0.72 × 0−14 cm2 |
Na–O2 v.c.c.† cross section (σNa−O2) | 0.70 × 10−14 cm2 |
Weighted v.c.c.† rate (γvcc) | 1/(35 μs) |
Na–O2 spin exchange cross sect. at TNa (σSNa−O2) | 0.50 × 10−14 cm2 |
Weighted spin-exchange rate at TNa (γS) | 1/(245 μs) |
Recoil frequency Shift of sodium atoms (ΩNaRecoil) | 50 kHz |
Laser parameters | |
Launched laser power in air (P) | 20 W |
Central D2 vacuum wavelength (λ) | 589.159 nm |
Laser FWHM linewidth (Δf) | <5 MHz |
Repumping power fraction (q) | 0.1 |
Repumping frequency offset (Δfab) | 1.7178 GHz |
