Coherent light generators – Particular beam control device
Patent
1986-07-18
1988-03-15
Davie, James W.
Coherent light generators
Particular beam control device
372106, 372108, H01S 310
Patent
active
047317884
ABSTRACT:
A low divergence laser oscillator of the kind wherein an intra-cavity oscillator beam is propagated along a resonator axis and within a portion of the volume of the active medium and wherein a part of the intra-cavity oscillator beam intensity is coupled out of the oscillator by a first outcoupler as an extra-cavity beam. One of the oscillator beam is expanded and collimated so as to produce an expanded and collimated extra-cavity beam having a cross-sectional area substantially greater than the cross-sectional area of a portion of the active medium. Substantially the total intensity of the expanded collimated extra-cavity beam is introduced into the active medium so as to fill a volume of the active medium which is substantially greater than the volume of the above portion, thereby giving rise to amplification of the reintroduced beam. A polarizing element located within the resonator is used for the introducing. The intra-cavity beam is either transmitted through or reflected by the polarizing element while the extra-cavity beam is directed onto the polarizing element or transmitted therethrough without passing through said first outcoupler, a second outcoupling means being provided for coupling out the amplified beam.
REFERENCES:
patent: 3609590 (1969-12-01), Jernigan
patent: 3852684 (1974-12-01), Roess et al.
patent: 3919664 (1975-11-01), McAllister
patent: 4127828 (1978-11-01), Klauminzer
patent: 4276519 (1981-06-01), Marteau
Hnilo et al; "A Reflection Beam Expander for Short Cavity Dye Laser"; Jun. 1980; Optics Communications; vol. 33, No. 3, pp. 311-314.
Eesley et al; "Dye-Laser Cavity Employing a Reflective Beam Expander"; Jul. 1976; IEEE Journal of Quantum Electronics; vol. QE-12, No. 7, pp. 440-442.
Davie James W.
El-Op Electro-Optics Industries Limited
Randolph B.
LandOfFree
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