Laser scientists can now generate pulses of light as short as 1 fs = 10−15 s. One of the great difficulties in working with such short pulses is that many EM waves of different frequencies must be superposed to create the pulse. Because real optical elements like lenses and prisms are made of real materials for which the index of refraction is wavelengthdependent i. e., the material is dispersive, parts of the pulse with different frequencies travel through the optical elements at different speeds and become separated, so the pulse spreads out. Consider a short laser pulse which is normally incident on a piece of crown glass which is L = 3.39 mm thick. The index of refraction for a wavelength of λB = 402 nm in the blue part of the pulse is nB = 1.53, and the index of refraction for a wavelength of λR = 672 nm in the red part of the pulse is nR = 1.51. How much sooner does the red part of the pulse arrive at the end of the piece of glass than the blue part? Answer in units of fs.
Answers: 2
Physics, 22.06.2019 09:30, tsvijay121
Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec
Answers: 3
Physics, 22.06.2019 17:40, Tyrant4life
Which describes an object in projectile motion? check all that apply. a.gravity acts to pull the object downb. the object moves in a straight path. c.the forward velocity of the object is 0 m/s. d.the object’s inertia carries it forward. e.the path of the object is curved.
Answers: 2
Physics, 22.06.2019 20:30, justaguy15
Atypical jetliner lands at a speed of 146 mi/h and decelerates at the rate of (10.4 mi/h)/s. if the jetliner travels at a constant speed of 146 mi/h for 1.5 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?
Answers: 2
Laser scientists can now generate pulses of light as short as 1 fs = 10−15 s. One of the great diffi...
Mathematics, 15.05.2021 23:00
Mathematics, 15.05.2021 23:00
Mathematics, 15.05.2021 23:00
Mathematics, 15.05.2021 23:00
Chemistry, 15.05.2021 23:10