External laser frequency stabilizer

Patent · Tue Oct 13 04:00:00 EDT 1987

OSTI ID:5759053

Hall, J L; Hansch, T W

A frequency transducer for controlling or modulating the frequency of a light radiation system is described comprising: a source of radiation having a predetermined frequency; an electro-optic phase modulator for receiving the radiation and for changing the phase of the radiation in proportion to an applied error voltage; an acousto-optic modulator coupled to the electro-optic modulator for shifting the frequency of the output signal of the electro-optic modulator; a signal source for providing an error voltage representing undesirable fluctuations in the frequency of the light radiation; a first channel including a fast integrator coupled between the signal source and the input circuit of the electro-optic modulator; a second channel including a voltage controlled oscillator coupled between the signal source and the acousto-optic modulator; and a network including an electronic delay circuit coupled between the first and second channels for matching the delay of the acousto-optic modulator.

• Assignee: Stanford Univ., Stanford, CA
• Patent Number(s): US 4700150
• OSTI ID: 5759053
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ACOUSTICS
CONTROL
DESIGN
ELECTRIC POTENTIAL
ELECTRO-OPTICAL EFFECTS
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
FREQUENCY CONTROL
FREQUENCY MODULATION
LASERS
MODULATION
PHASE SHIFT
RADIATIONS
TRANSDUCERS
VISIBLE RADIATION