Diode laser having minimal beam diameter and optics

Details Diode laser having minimal beam diameter and optics Diode laser having minimal beam diameter and optics

1993-04-05

1994-06-14

Scott, Jr., Leon

Coherent light generators

Particular beam control device

372 9, 372 98, 372108, H01S 308

Patent

active

053217179

ABSTRACT:
A diode laser and optical system uses the minimum number of elements to obtain a small diameter beam (1 mm). A large numerical aperture lens collimates the full energy from the diode and the oval shaped output of the collimator is corrected for astigmatism by means of a cylinder lens and made circular by two identical prisms arranged to receive the corrected, collimated beam directly at a right angle surface of the first prism and transmit the beam after deflection to the second prism further which demagnifies the beam producing the round (.ltoreq.1 mm diameter) beam spot output of the laser. The output beam is well collimated (1 mRad) and wave front aberration is diffraction limited. The spot size at 50 feet distance is maintained. In order to hold total Gaussian distribution energy, the prisms are coated with a multilayer dielectric thin film eliminate reflection and to transmit the TE mode wave without loss at the Brewster angle.

REFERENCES:
patent: 4609258 (1986-09-01), Adachi et al.
patent: 5177750 (1993-01-01), Zorabedian
patent: 5212710 (1993-05-01), Kaneda et al.

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