A 1 m length dye laser emitting around 500 nm has a 1 nm bandwidth. How...
A 1 m length dye laser emitting around 500 nm has a 1 nm bandwidth. How many longitudinal modes can the laser have?
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A 1 m length dye laser emitting around 500 nm has a 1 nm
bandwidth. How...
3- Consider a HeNe laser radiating at spatial TEM mode, wavelength à = 632 nm and...
3- Consider a HeNe laser radiating at spatial TEM mode, wavelength à = 632 nm and spectral line-width AA = 0.1nm. Beam diameter at z, =0 is w, =1.0 mm. Laser resonator consists of two plane mirrors of separation L=1.0 m. a) What is the beam diameter at at 1Km. b) What is divergence angle of beam. c) What is the coherence length of this laser. d) What is the longitudinal frequency separation. (assume refractive index n=1 inside the cavity)...
A laser emitting at 350 nm passes through a cuvette containing water. Due to the Raman...
A laser emitting at 350 nm passes through a cuvette containing water. Due to the Raman effect, as the laser passes through water, it loses energy to excite vibrational modes of water molecules. Consider only the vibrational level in water corresponding to the stretching of the OH bond which occurs at about 3500 cm−1. What is the wavelength of the laser radiation after it went through the water if the energy is lost due to the excitation of one vibrational...
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....
20. A green diode laser has a wavelength of 532 nm. How many wavelengths of this laser are equivalent to 1 mm. (You did...
20. A green diode laser has a wavelength of 532 nm. How many wavelengths of this laser are equivalent to 1 mm. (You did a similar calculation on page 94 for a red laser.) A) around 1880 wavelengths B) around 188,000 wavelengths C) around 180 wavelengths D) none of the above is within 100 wavelengths of correct answer
A helium-neon (He-Ne) laser has a gain bandwidth (defined as the frequency interval over which the...
A helium-neon (He-Ne) laser has a gain bandwidth (defined as the frequency interval over which the laser gain equals or exceeds the minimum threshold for gain) given by ΔνG=2.5ΔνG=2.5 GHz, centred on λ=633λ=633 nm emission wavelength. a) Determine the maximum length of the He-Ne resonator when only one resonant axial mode can oscillate at any given time. (cm) b) By what length must the resonator be changed in order to tune the frequency of this He-Ne (i.e. with one resonant...
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...
A powerful 0.54-W laser emitting 640-nm photons shines on a black sail of a tiny 0.10-g...
A powerful 0.54-W laser emitting 640-nm photons shines on a black sail of a tiny 0.10-g cart that can coast on a frictionless track. A) Determine the force of the light on the sail. Assume that the light is totally absorbed by the sail. B) What time interval is needed for the cart's speed to increase from zero to 2.0 m/s?
(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...
A laser source has an energy of 1.85 kJ from a radiation of 450 nm, how...
A laser source has an energy of 1.85 kJ from a radiation of 450 nm, how many photons were in the source? (h = 6.626 x 10-34 J*s-1 and c = 3 x 108 m/s)
2. Lasers (20 points) A He-Ne laser operating atA-632.8 nm produces 50 mW of multimode power...
2. Lasers (20 points) A He-Ne laser operating atA-632.8 nm produces 50 mW of multimode power as its output. It has an inhomogeneously broadened gain profile with a Doppler linewidth Av1.5 GHz FWHM. The spectral profile of the gain coefficient in this case is given (V-Vo)2 y the Gaussian form Yo(v)-Yo(Vo) exp | WIth ΔνD_ ー resonator is 30-cm-long, and the refractive index of the He-Ne gas mixture is very close to that of the air: n-1 a). If the...
3- Consider a HeNe laser radiating at spatial TEM mode, wavelength à = 632 nm and spectral line-width AA = 0.1nm. Beam diameter at z, =0 is w, =1.0 mm. Laser resonator consists of two plane mirrors of separation L=1.0 m. a) What is the beam diameter at at 1Km. b) What is divergence angle of beam. c) What is the coherence length of this laser. d) What is the longitudinal frequency separation. (assume refractive index n=1 inside the cavity)...
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....
20. A green diode laser has a wavelength of 532 nm. How many wavelengths of this laser are equivalent to 1 mm. (You did a similar calculation on page 94 for a red laser.) A) around 1880 wavelengths B) around 188,000 wavelengths C) around 180 wavelengths D) none of the above is within 100 wavelengths of correct answer
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...
(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...
2. Lasers (20 points) A He-Ne laser operating atA-632.8 nm produces 50 mW of multimode power as its output. It has an inhomogeneously broadened gain profile with a Doppler linewidth Av1.5 GHz FWHM. The spectral profile of the gain coefficient in this case is given (V-Vo)2 y the Gaussian form Yo(v)-Yo(Vo) exp | WIth ΔνD_ ー resonator is 30-cm-long, and the refractive index of the He-Ne gas mixture is very close to that of the air: n-1 a). If the...
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