Total optical loss measurement device

Details Total optical loss measurement device Total optical loss measurement device

1984-05-14

1986-11-25

Willis, Davis L.

Optics: measuring and testing

Of light reflection

356239, 356432, 356448, G01N 2155

Patent

active

046245731

ABSTRACT:
The total optical loss caused by laser induced damage to an optical component is measured by monitoring the phase shift during mirror reflectance or transmission. The phase shift is directly proportional to the amount of loss. A secondary laser illuminates the area under test with a coherent light beam well below the component's damage threshold. This reference beam is modulated. The reflected or transmitted reference beam is monitored by a photomultiplier tube whose output is fed to a lock-in circuit. The lock-in circuit compares the phase of the received light to the induced modulation.

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Virgil Sanders, "High-Precision Reflectivity Measurement Technique for Low-Loss Laser Mirrors", Applied Optics, vol. 16, No. 1, Jan. 1977, pp. 19 and 20.
Herbelin et al., "Development of Laser Mirrors of Very High Reflectivity Using the Cavity-Attenuated Phase-Shift Method", Applied Optics, vol. 20, No. 19, 10-1-81, pp. 3341-3344.

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