| He-Ne Laser | Diode Laser |
Wave length, λ [nm] | 633 | 532 |
Focal length of focusing lens, f [mm] | 400 | 400 |
Beam diameter at e-2 intensity [mm] | 1.35 | 1.35 |
Beam spacing, s [mm] | 38.87 | 39.13 |
Calculated half-angle of beam intersection, θ | 2.78˚ | 2.8˚ |
Fringe spacing, δf [μm] | 6.53 | 5.45 |
Velocimeter transfer constant, K [MHz/m·s−1] | 0.153 | 0.183 |