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An optical chopper is a device placed in the laser beam path to periodically obstruct the light. If a continuous wave laser beam is passed through an optical chopper, it is "chopped" into a pulsed beam of some frequency. The light only passes in between two blades. A student is working in a laboratory and requires a pulsed las beam. However, the student only has a continuous wave laser. The student knows that they can use a chopper instead of having to purchase a brand new laser. The chopper has 8 blades (just like in the graphic above), and is rated to supply frequencies between 4Hz and 10kHz. Each blade subtends an angle 0=0.384 rad. If the pulsed beam is desired to have each pulse train (the light in between two gaps) last 71.18 us, what frequency should the student select for the optical chopper? Include SI units 2nf) (Hint: frequency and angular velocity are related by the formula w = Answer: 0.896 Hz
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Transcribed Image Text:An optical chopper is a device placed in the laser beam path to periodically obstruct the light. If a continuous wave laser beam is passed through an optical chopper, it is "chopped" into a pulsed beam of some frequency. The light only passes in between two blades. A student is working in a laboratory and requires a pulsed las beam. However, the student only has a continuous wave laser. The student knows that they can use a chopper instead of having to purchase a brand new laser. The chopper has 8 blades (just like in the graphic above), and is rated to supply frequencies between 4Hz and 10kHz. Each blade subtends an angle 0=0.384 rad. If the pulsed beam is desired to have each pulse train (the light in between two gaps) last 71.18 us, what frequency should the student select for the optical chopper? Include SI units 2nf) (Hint: frequency and angular velocity are related by the formula w = Answer: 0.896 Hz
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