Optics: measuring and testing – By light interference – Having wavefront division
Reexamination Certificate
2007-02-13
2007-02-13
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
Having wavefront division
C356S508000
Reexamination Certificate
active
10836763
ABSTRACT:
A plurality of gratings (G1, G2) are arranged together with a wavefront sensor, actuators, and feedback system to align the gratings in such a manner, that they operate like a single, large, monolithic grating. Sub-wavelength-scale movements in the mechanical mounting, due to environmental influences, are monitored by an interferometer (28), and compensated by precision actuators (16, 18, 20) that maintain the coherently additive mode. The actuators define the grating plane, and are positioned in response to the wavefronts from the gratings and a reference flat, thus producing the interferogram that contains the alignment information. Movement of the actuators is also in response to a diffraction-limited spot on the CCD (36) to which light diffracted from the gratings is focused. The actuator geometry is implemented to take advantage of the compensating nature of the degrees of freedom between gratings, reducing the number of necessary control variables.
REFERENCES:
Trentelman, M. et al., Finite size compression gratings in a large aperture chirped pulse amplification laser system, Applied Optics, vol. 36, No. 33, pp. 8567-8573, (1997).
Zhang, T. et al., An array-grating compressor for high-power chirped-pulse amplification lasers, Optics Communications, vol. 145, pp. 367-376, (1998).
Bunkenburg Joachim
Huang Hu
Kessler Terrance J.
Detschel Marissa J.
Lukacher Kenneth J.
Lukacher Martin
University of Rochester
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