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- [25] TUNABLE FAR-INFRARED RADIATION GENERATED FROM DIFFERENCE FREQUENCY BETWEEN 2 RUBY LASERS PHYSICAL REVIEW A, 1971, 3 (06): : 2148 - &
- [27] TUNABLE FAR-INFRARED RADIATION GENERATED FROM DIFFERENCE FREQUENCY BETWEEN 2 RUBY LASERS PHYSICAL REVIEW, 1969, 180 (02): : 363 - +