Magnetic laser control

Patent · Tue Oct 18 04:00:00 EDT 1988

OSTI ID:6615988

Brown, J R

This patent describes a closed loop feedback control for frequency stabilization of a laser containing an excited lasing material within a lasing chamber influenced by a first magnetic field to generate a laser beam having two component frequency modes of differing frequency in the laser beam, a thermal control means for applying thermal energy to the lasing chamber for adjusting lasing chamber length to control frequency difference of component frequency modes of the laser beam over a wide range, the feedback control having a polarizer for receiving the laser beam and interfering common linearly polarized components of the component frequency modes, to produce a heterodyned light beam with an intensity modulation having a beat frequency representing the difference in frequency between the component frequency modes: a photodetector for receiving and heterodyned light beam to generate a beat signal representing the intensity modulation of the heterodyned light beam, the beat signal representing the difference in frequency between the component frequency modes; a reference signal generator for producing a reference signal having a frequency characteristic of a desired beat signal frequency.

• Assignee: Beckman Instruments, Inc., Fullerton, CA
• Patent Number(s): US 4779279
• OSTI ID: 6615988
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CLOSED-LOOP CONTROL
CONTROL
CONTROL SYSTEMS
ELECTROMAGNETIC RADIATION
FEEDBACK
FREQUENCY CONTROL
FREQUENCY MODULATION
FREQUENCY SELECTION
GAS LASERS
LASER MATERIALS
LASER RADIATION
LASERS
MAGNETIC FIELDS
MATERIALS
MODE SELECTION
MODULATION
PHOTODETECTORS
RADIATIONS
TEMPERATURE CONTROL