초록 ▼

An acousto-optic deflector system including first and second transducers for producing acoustic waves for interaction with an optic beam in an acousto-optic device. The transducers are driven by signals of differing frequencies (f1+D1) in order to produce two deflected optical beams from an incident

An acousto-optic deflector system including first and second transducers for producing acoustic waves for interaction with an optic beam in an acousto-optic device. The transducers are driven by signals of differing frequencies (f1+D1) in order to produce two deflected optical beams from an incident optical beam launched from a laser. The two deflected beams are detected by a common photodetector whose output is filtered whereby to separate a component which is dependent on the frequency difference. The phase of this component is the relative optical phase of the two deflected optical beams. By determining the phase of the component for different frequencies (f1, F1=fT etc.), the optical angle of incidence (qi) may be obtained. Alternatively, by frequency modulating both transducer drive signals and appropriately electronically processing the detector output, a signal whose amplitude varies with the optical angle of incidence can be obtained. This signal is a minimum when the optical angle of incidence is optimized. Optimization of the optical angle of incidence can be performed automatically.

대표청구항 ▼

An acousto-optic deflector system comprising: a body of an acousto-optic material; first and second transducer means, said first transducer means being driven by a given frequency and said second transducer means being driven by a frequency equal to the sum of the value of said given frequency plus

An acousto-optic deflector system comprising: a body of an acousto-optic material; first and second transducer means, said first transducer means being driven by a given frequency and said second transducer means being driven by a frequency equal to the sum of the value of said given frequency plus a delta frequency value for producing respective first and second acoustic signals of first and second different acoustic frequencies in said body; a laser beam source to establish a laser beam through said body, whereby to produce first and second deflected optical beams from said body; common detector means for detecting said first and second optical beams; and signal processing means serving in use of the deflector system to separate a component of the output signal of said detector means which component is dependent on the difference between said first and second acoustic frequencies, said signal processing means also detecting the phase of said component corresponding to the relative optical phase of said first and second deflected optical beam.