There are 10^10 photons per second incident on a photodetector at wavelength 0.8 p,m. Compute the...
There are 10^10 photons per second incident on a photodetector
at wavelength 0.8 p,m.
Compute the power incident on the detector. If this detector
converts light to current at
a rate of 0 mA/mW, what current is produced?
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There are 10^10 photons per second incident on a photodetector at wavelength 0.8 p,m. Compute the...
Problem 3 (25 points) A silicon photodetector has an internal photo responsivity of 0.5 A/Wt wavelength of 850 nm. When photons of wavelength 850 nm are incident normally on this photodetector, so...
Problem 3 (25 points) A silicon photodetector has an internal photo responsivity of 0.5 A/Wt wavelength of 850 nm. When photons of wavelength 850 nm are incident normally on this photodetector, some photons are reflected back and some photons penetrate to the detection region and are absorbed by the photodetector. (a) The index of refraction of silicon is 3.45. If the electric current measured by this photodetector is 20 mA, what is the incident optical power? (b) Silicon has a...
Problem 5: A laser light of 10 mW power at the 1550 nm wavelength is incident...
Problem 5: A laser light of 10 mW power at the 1550 nm wavelength is incident to a Silicon PIN photodetector. What is the photocurrent from this silicon PIN photodetector? (a) 1.12 mA, (b) 1.10 mA, (c) 1.55 mA, (d) 1550 mA, (e) 0 mA
12. Consider a current of 3 mA flowing through an LED whose band gap is about 2 eV. (A) How many photons are produced p...
12. Consider a current of 3 mA flowing through an LED whose band gap is about 2 eV. (A) How many photons are produced per second? (B) What is the power of the light produced? Notice that this small current produces a light that is easily visible. (For comparison, a typical flashlight bulb, which is very easily visible, consumes about a watt of power, of which about 50 mW is visible light.)
12. Consider a current of 3 mA flowing...
Question 3: (8 points) (a) A photodetector has an effective area of 6x102 cm. It is...
Question 3: (8 points) (a) A photodetector has an effective area of 6x102 cm. It is illuminated with 700nm laser light that has an intensity of 2.5mW/cm². Assuming each three photons generate one electron-hole pair on average, calculate the generated photocurrent. (b) A 40 nW optical power at 1555 nm is incident on APD. The APD has refractive index of 3.5, and its multiplication factor is 12. It is efficiency without avalanche breakdown is 80%. Find: a) The responsivity of...
bead Incident laser 3) How many infrared photons per second are required to suspend a completely...
bead Incident laser 3) How many infrared photons per second are required to suspend a completely absorbing black bead (mass m= 5x10-6 kg) against the force of gravity? (Recall g=9.8 m/s2.) The wavelength of the photons is = 1 um. lens
A 200-W infrared laser emits photons with a wavelength of 8.60 10-7 m, and a 200-W...
A 200-W infrared laser emits photons with a wavelength of 8.60 10-7 m, and a 200-W ultraviolet light emits photons with a wavelength of 2.64 10-7 m. (a) Which has greater energy, a single infrared photon or a single ultraviolet photon? -a single infrared photon -a single ultraviolet photon (b) What is the energy of a single infrared photon? What is the energy of a single ultraviolet photon? (c) How many infrared photons are emitted per second? How many ultraviolet...
When ultraviolet photons with a wavelength of 3.45 x 10' m are incident on an unknown...
When ultraviolet photons with a wavelength of 3.45 x 10' m are incident on an unknown metal surfce in a vacuum, electrons with a maximum kinetic energy of 1,52 eV are emitted from tho sarface. What is the work function of the metal7 (a) 3.60 eV (b) 3.11 ey (c) 2.59 ev (d) 2.08 ev (e) 1.98 ev
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light...
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? 1.23E22 photons/s 5.07E21 photons/s 3.62E19 photons/s O 1.52E19 photons/s 0 4.27E19 photons/s
ect Question 10 0/1 pts Photons of wavelength 10 nm are incident on a crystal with...
ect Question 10 0/1 pts Photons of wavelength 10 nm are incident on a crystal with interatomic spacing 80 nm. At what angle is the first-order maximum in the diffraction pattern? 0.9º. 1.8°. 2.4º. 3.6º. 7.2º.
A laser used in LASIK eye surgery produces 50 pulses per second. The wavelength is 192...
A laser used in LASIK eye surgery produces 50 pulses per second. The wavelength is 192 nm (in air) and each pulse lasts 11 ps. The average power emitted by the laser is 122.8 mW and the beam diameter is 0.8 mm. (a) In what part of the EM spectrum is the laser pulse? The wavelength of the laser light is longer/shorter than visible light. (b) How long (in centimeters) is a single pulse of the laser in air? d...
Problem 3 (25 points) A silicon photodetector has an internal photo responsivity of 0.5 A/Wt wavelength of 850 nm. When photons of wavelength 850 nm are incident normally on this photodetector, some photons are reflected back and some photons penetrate to the detection region and are absorbed by the photodetector. (a) The index of refraction of silicon is 3.45. If the electric current measured by this photodetector is 20 mA, what is the incident optical power? (b) Silicon has a...
Problem 5: A laser light of 10 mW power at the 1550 nm wavelength is incident to a Silicon PIN photodetector. What is the photocurrent from this silicon PIN photodetector? (a) 1.12 mA, (b) 1.10 mA, (c) 1.55 mA, (d) 1550 mA, (e) 0 mA
12. Consider a current of 3 mA flowing through an LED whose band gap is about 2 eV. (A) How many photons are produced per second? (B) What is the power of the light produced? Notice that this small current produces a light that is easily visible. (For comparison, a typical flashlight bulb, which is very easily visible, consumes about a watt of power, of which about 50 mW is visible light.)
12. Consider a current of 3 mA flowing...
Question 3: (8 points) (a) A photodetector has an effective area of 6x102 cm. It is illuminated with 700nm laser light that has an intensity of 2.5mW/cm². Assuming each three photons generate one electron-hole pair on average, calculate the generated photocurrent. (b) A 40 nW optical power at 1555 nm is incident on APD. The APD has refractive index of 3.5, and its multiplication factor is 12. It is efficiency without avalanche breakdown is 80%. Find: a) The responsivity of...
bead Incident laser 3) How many infrared photons per second are required to suspend a completely absorbing black bead (mass m= 5x10-6 kg) against the force of gravity? (Recall g=9.8 m/s2.) The wavelength of the photons is = 1 um. lens
When ultraviolet photons with a wavelength of 3.45 x 10' m are incident on an unknown metal surfce in a vacuum, electrons with a maximum kinetic energy of 1,52 eV are emitted from tho sarface. What is the work function of the metal7 (a) 3.60 eV (b) 3.11 ey (c) 2.59 ev (d) 2.08 ev (e) 1.98 ev
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? 1.23E22 photons/s 5.07E21 photons/s 3.62E19 photons/s O 1.52E19 photons/s 0 4.27E19 photons/s
ect Question 10 0/1 pts Photons of wavelength 10 nm are incident on a crystal with interatomic spacing 80 nm. At what angle is the first-order maximum in the diffraction pattern? 0.9º. 1.8°. 2.4º. 3.6º. 7.2º.
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