ss =

4 · ·

π ·

Notes:

(1) f: focal length of lens

(2) D: gaussian beam dia at 1/e² pwr pts

(3) λ: wavelength of light in units of μm

(4) f & D must be in the same units

Z_{r} =

π · ²

Notes:

(1) w₀: begining beam waist or semi-diameter

(2) λ: wavelength of light in units of μm

(3) all values must be in mm

ss =

1.22 · ·

Notes:

(1) f: focal length of lens

(2) D: Airy disc dia at first null points

(3) λ: wavelength of light in units of μm

(4) f & D must be in the same units

CA =

2 · ·

Notes:

(1) na: numerical aperture of fiber

(2) f: focal length of lens

½ FOV =

1000 ·

2 ·

Notes:

(1) D: diameter of fiber

(2) f: focal length of lens

(3) D & f must be in the same units