Combined beam cross-section correcting, collimating and de-astig

Details Combined beam cross-section correcting, collimating and de-astig Combined beam cross-section correcting, collimating and de-astig

1984-07-06

1987-02-17

Corbin, John K.

350286, G02B 504

Patent

active

046435387

ABSTRACT:
A combined collimating, cross-section correcting and de-astigmatizing lens system for providing laser beams which, are fully collimated, de-astigmatized, and have a circular cross-section of the proper diameter. In the preferred embodiment a first compound spherical lens system partially collimates the beam so that the in-line combined cross-section corrector/de-astigmatizer system can properly de-astigmatize the beam. The beam cross-section corrector/de-astigmatizer is comprised of first and second triangular prisms oriented at non-normal angles to the path of the beam. This allows both the cross-section and the astigmatism of the beam to be corrected. A planar mirror between the first and second prisms directs the beam from the first prism to the second prism, so that the beam can exit the second prism co-axial with the incident beam path. The beam then enters the second collimating subsystem, which also acts as a telescopic lens system, and simultaneously completely collimates the beam and expands it to the proper diameter for transmission through the optical system of the main device. The beam, upon exiting is fully collimated beam of the proper power output, is de-astigmatized and has a circular cross-section of the proper diameter.

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