duration, high-peak power pulses from continuous wave (CW) Nd.YAG lasers. RF power (sound waves in the radio frequencies-megahertz) is pumped into the Q-switch crystal, deflecting the beam, changing the Q or quality factor of the laser cavity enough to extinguish the lasing action. Rapidly switching the RF sound waves on and off switches the laser beam on and off. In this way, the laser can be made to emit short duration (nanosecond range) laser pulses at high repetition rates (Kilohertz range).
SECTION XVIIIOPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF.
9000000000 80OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; PARTS AND ACCESSORIES THEREOF.
9013000000 80Liquid crystal devices not constituting articles provided for more specifically in other headings; lasers, other than laser diodes; other optical appliances and instruments, not specified or included elsewhere in this chapter.
GIR 1 TERMS OF HEADING 9013 OTHER OPTICAL APPLIANCES AND INSTRUMENTS, NOT SPECIFIED OR INCLUDED ELSEWHERE IN THIS CHAPTER GIR 6 TERMS OF ONE-DASH SUBHEADING 9013 90 PARTS AND ACCESSORIES TERMS OF TWO-DASH S/H 9013 90 90 CN CODE
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