Frequency control for tunable laser utilized in a position control system
Abstract
Abstract A CALIBRATION SYSTEM FOR A TUNABLE LASER UTILIZED AS A POSITION INDICATING DEVICE IN A POSITION CONTROL SYSTEM INCLUDES AN INTERFEROMETER COUNTING THE INTERFERENCE FRINGES IN A PATTERN PRODUCED BY THE LASER OUTPUT AND A PORTION OF THE OUTPUT RETURNED FROM A PRISM DISPOSED ON A CARRIAGE WHICH IS MOVED THROUGH A PRECISELY KNOWN, REPEATABLE MOVEMENT. BY USING THE INTERFEROMETER OUTPUT TO COUNT DOWN A DIGITAL COUNTER INTO WHICH A NUMBER HAS BEEN PRESET WHICH CORRESPONDS TO THE CHANGE IN THE NUMBER OF FRINGES THAT SHOULD BE OBSERVED AT A GIVEN LASER FREQUENCY, ANY REMAINING COUNT AFTER THE MOVEMENT INDICATES ERROR DUE TO CHANGES IN TRANSMISSION CHARACTERISTICS OF THE BEAM PATH. THE REMAINING COUNT MAY THEN BE USED TO PROVIDE AN ANALOG VOLTAGE FOR ADJUSTMENT OF THE LASER FREQUENCY.
Inventors
- 👤 John M Rhoades
Bibliographic Details
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