Laser cavity optical system for stabilizing the beam from a phase locked multi-emitter broad emitter laser

Patent · Tue Apr 07 04:00:00 EDT 1987

OSTI ID:6535633

Scifres, D R; Sprague, R A

A laser cavity optical system is described for collimating a light output from a multi-emitter or broad emitter semiconductor laser capable of producing a multiple or broad low divergence output beam from the laser. The laser near field has a single beam waist position in a first spatial directional near the emission facet of the laser and having an elongated but phase coherent far field emitting pattern in a second spatial direction. A lens system is positioned at one facet of the laser for imaging the near field of the single beam waist position in the first spatial direction and reimaging the far field pattern in the second spatial direction after having first focused the pattern in the second spatial direction to a single beam waist position. The improvement described here comprises a feedback means which is partially reflecting and partially transmitting and is located at the second spatial direction beam waist position to stabilize the laser beam and prevent laser beam shift at higher operating powers and operating temperatures.

• Assignee: Xerox Corp., Stamford, CT
• Patent Number(s): US 4656641
• OSTI ID: 6535633
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
BEAM OPTICS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
FEEDBACK
FOCUSING
IMAGE PROCESSING
LASER CAVITIES
LASER RADIATION
LASERS
LENSES
MODE LOCKING
OPERATION
OPTICAL SYSTEMS
POSITIONING
PROCESSING
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPATIAL DISTRIBUTION
STABILIZATION
TEMPERATURE EFFECTS