Lens system for focussing a divergent laser beam

Details Lens system for focussing a divergent laser beam Lens system for focussing a divergent laser beam

1985-07-12

1988-06-28

Corbin, John K.

350 9618, G02B 960, G02B 632

Patent

active

047535210

ABSTRACT:
A lens system for focussing a divergent laser beam, particularly for converting the three dimensional amplitude and phase distribution of the highly divergent laser beam of a semiconductor laser into the amplitude and phase distribution of the fundamental mode coupleable into a monomode fiber is disclosed. The lens system comprises a front element in the form of a collecting aplanatic meniscus and one or more following refractive lenses for focussing the laser beam emerging from the front element. The refractive front face of the meniscus facing the object side aberration free point is designed such that it at least approximately has the form of a phase surface of the divergent laser beam emanating from a location at least close to the object side aberation free point which impinges the meniscus. The front face thereby becomes largely aberration free. A minimal tilting of the meniscus relative to the laser radiation causes the part of the divergent laser radiation reflected by the front face to be refocussed next to the source, thus providing a highly reaction free coupling optics for coupling a semiconductor laser to a fiber. Alternatively, the lens system is superbly suited as an external resonator for a semi-conductor laser.

REFERENCES:
patent: 404506 (1889-06-01), Schroder
patent: 2687063 (1954-08-01), Coleman
patent: 4538895 (1985-09-01), Higgins et al.
Optik, pp. 57-60 (1978).
"Light Coupling into Monomode Fibres", Oskar Krumpholz, Wiss. Ber., AEC-Telefunke, 48 (1975), pp. 90-94.
"An Effective Nonreciprocal Circuit for Semiconductor Laser-to-Optical-Fiber Coupling Using a YIC Sphere", Sugie et al., J. Lightwave Technology, 1 (1983).
"Efficient Laser Diode to Single-Mode Fiber Coupling Using a Combination", Saruwatari, IEEE J. Quantum Electronics, QE-17 (1981).
"Low-Loss Lens Connector for Single-Mode Fibers", S. Masuda, Appl. Optics, 21 (1982), pp. 3475-3483.

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