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A semiconductor laser has an optical cavity length of 350 um and an index of refraction...
(a) The optical gain coefficient of a semiconductor laser with 150 μm cavity length is shown in Fig 1. The loss coefficient and the refractive index of the semiconductor laser are 21.6 cm" and 3....
(a) The optical gain coefficient of a semiconductor laser with 150 μm cavity length is shown in Fig 1. The loss coefficient and the refractive index of the semiconductor laser are 21.6 cm" and 3.5 respectively. Find (i)The minimum gain coefficient required for lasing (ii) The frequency separation between the longitudinal modes of the laser (iii) The number of longitudinal modes emitted (b) This laser is required to produce a single mode output at a wavelength of 1.32 unm If...
Q5) Optical cavity. Frequency spacing between succesive modes of a cavity is given by JAvl c/(2nL)....
Q5) Optical cavity. Frequency spacing between succesive modes of a cavity is given by JAvl c/(2nL). a. Use c-λν to show that wave length spacing between succesive modes of a cavity is lan-R/(2n L). b. An Argon gas laser has a gain region of 1.0 m length. The light emission by Argon atoms covers a frequency range of 3.3 GHz. The index of refraction of Argon gas is 1. How many modes can lase simultaneously in this Argon laser? c....
7. A mode-locked Ti:Al203 laser with a cavity length of 1.5m and center wavelength of 790nm is used for optical frequency metrology. If the pulse duration is 20fs, and the laser has a hyperbolic seca...
7. A mode-locked Ti:Al203 laser with a cavity length of 1.5m and center wavelength of 790nm is used for optical frequency metrology. If the pulse duration is 20fs, and the laser has a hyperbolic secant square pulse profile a) Estimate the frequency bandwidth of the laser output.HINT: AtAf0.315 b) Estimate the number of modes in the laser output. c) If the pulse to pulse carrier envelope phase changes by 0.1rad, calculate the carrier offset frequency shift HINT: ΔωςΕ-ter d) What...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r 0.9 The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss ti...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r 0.9 The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch for...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r = 0.9. The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r = 0.9. The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch...
We would like to make a helium–neon laser (λ = 632.8nm) that runs on only a...
We would like to make a helium–neon laser (λ = 632.8nm) that runs on only a single cavity mode. The gain line is about 1.5 GHz wide, so we need to make sure the spacing of the cavity modes is that large. a. What is the length of a cavity that has a free spectral range of 1.5GHz? Should the laser be longer or shorter than this length? Can we expect high power from this laser? b. What is the...
need Answers for c & d only. Everthing else is good. need answers for d &...
need Answers for c & d only. Everthing else is good.
need answers for d & e only. Not c. Thank you
11:14 AM Wed Jun 19 71% Problem1: Fiber Optics different optical loss (attenuation) sources a) Provide six extrinsic sources) of an optical fiber system. b) Sketch and briefly explain the Total Internal Reflection (TIR) phenomenon. c) What is the difference between a step index fiber and a graded index fiber? (Hint: Consider the ray tracing of different modes...
4. (a)A GaAlAs laser diode has a 500 micron cavity length which has an effective absorption...
4. (a)A GaAlAs laser diode has a 500 micron cavity length which has an effective absorption coefficient of 10 cm . For uncoated facets the reflectivities are0.32 at each end. What is the optical gain at the lasing threshold? (b) If one end of the lasers is coated with a dielectric reflector so that its reflectivity is now 90%, what is the optical gain at the lasing threshold? -1 Notice that required gain to overcome the loss can be reduced...
6. A GaAs laser diode operating at 850 nm has a 500 μm cavity length and a refractive index of n 3.7. The gain-wavelength relationship is Gaussian, given by: g(λ)-g(0) exp[-a-h)2 / 201 a) Calcula...
6. A GaAs laser diode operating at 850 nm has a 500 μm cavity length and a refractive index of n 3.7. The gain-wavelength relationship is Gaussian, given by: g(λ)-g(0) exp[-a-h)2 / 201 a) Calculate the frequency and wavelength spacing (Au) and Δλ). b) If at the halfpower point (g-0.5g(0)) we have λ-ho-2 nm, what is the spectral width of the gain, o?
6. A GaAs laser diode operating at 850 nm has a 500 μm cavity length and a...
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1....
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1.55 um 2, A 1.55 μm digital communications system operating at 4 GBits/s receives an average power of -24 dBm at the detector. On the assumption that 1 and 0 bits are equally likely to occur how many photons are received within each 1 bit? 3. A1.3 um digital communications system operating at 3 GBits/s receives an average power of -29 dBm at...
(a) The optical gain coefficient of a semiconductor laser with 150 μm cavity length is shown in Fig 1. The loss coefficient and the refractive index of the semiconductor laser are 21.6 cm" and 3.5 respectively. Find (i)The minimum gain coefficient required for lasing (ii) The frequency separation between the longitudinal modes of the laser (iii) The number of longitudinal modes emitted (b) This laser is required to produce a single mode output at a wavelength of 1.32 unm If...
Q5) Optical cavity. Frequency spacing between succesive modes of a cavity is given by JAvl c/(2nL). a. Use c-λν to show that wave length spacing between succesive modes of a cavity is lan-R/(2n L). b. An Argon gas laser has a gain region of 1.0 m length. The light emission by Argon atoms covers a frequency range of 3.3 GHz. The index of refraction of Argon gas is 1. How many modes can lase simultaneously in this Argon laser? c....
7. A mode-locked Ti:Al203 laser with a cavity length of 1.5m and center wavelength of 790nm is used for optical frequency metrology. If the pulse duration is 20fs, and the laser has a hyperbolic secant square pulse profile a) Estimate the frequency bandwidth of the laser output.HINT: AtAf0.315 b) Estimate the number of modes in the laser output. c) If the pulse to pulse carrier envelope phase changes by 0.1rad, calculate the carrier offset frequency shift HINT: ΔωςΕ-ter d) What...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r 0.9 The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch for...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r = 0.9. The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch...
need Answers for c & d only. Everthing else is good.
need answers for d & e only. Not c. Thank you
11:14 AM Wed Jun 19 71% Problem1: Fiber Optics different optical loss (attenuation) sources a) Provide six extrinsic sources) of an optical fiber system. b) Sketch and briefly explain the Total Internal Reflection (TIR) phenomenon. c) What is the difference between a step index fiber and a graded index fiber? (Hint: Consider the ray tracing of different modes...
4. (a)A GaAlAs laser diode has a 500 micron cavity length which has an effective absorption coefficient of 10 cm . For uncoated facets the reflectivities are0.32 at each end. What is the optical gain at the lasing threshold? (b) If one end of the lasers is coated with a dielectric reflector so that its reflectivity is now 90%, what is the optical gain at the lasing threshold? -1 Notice that required gain to overcome the loss can be reduced...
6. A GaAs laser diode operating at 850 nm has a 500 μm cavity length and a refractive index of n 3.7. The gain-wavelength relationship is Gaussian, given by: g(λ)-g(0) exp[-a-h)2 / 201 a) Calculate the frequency and wavelength spacing (Au) and Δλ). b) If at the halfpower point (g-0.5g(0)) we have λ-ho-2 nm, what is the spectral width of the gain, o?
6. A GaAs laser diode operating at 850 nm has a 500 μm cavity length and a...
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1.55 um 2, A 1.55 μm digital communications system operating at 4 GBits/s receives an average power of -24 dBm at the detector. On the assumption that 1 and 0 bits are equally likely to occur how many photons are received within each 1 bit? 3. A1.3 um digital communications system operating at 3 GBits/s receives an average power of -29 dBm at...
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