High-accuracy air refractometer utilizing two nonlinear optical

Details High-accuracy air refractometer utilizing two nonlinear optical High-accuracy air refractometer utilizing two nonlinear optical

1994-01-28

1995-02-28

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356361, 356358, G01B 1102

Patent

active

053942400

ABSTRACT:
An air refractometer measures the refractive index of air by directing a laser beam onto a first nonlinear optical crystal to convert a part thereof into a second-harmonic wave, directs the laser beam and the second-harmonic wave onto a reflecting mirror which reflects them onto a second nonlinear optical crystal to convert another part of the laser beam into a second-harmonic wave, produces interference fringes by interference between the harmonic wave produced by the first nonlinear optical crystal and the harmonic wave produced by the second nonlinear optical crystal, counts the number of interference fringes generated when the reflecting mirror is moved, and divides the number of interference fringes by the distance moved by the reflecting mirror.

REFERENCES:
patent: 5116126 (1992-05-01), Wang et al.
patent: 5172186 (1992-12-01), Hosoe
patent: 5177566 (1993-01-01), Leuchs et al.
patent: 5337145 (1994-08-01), Chaney

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