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- Q/1) The length of the optical cavity of a Nd-YAG laser is 30 [cm] and the wavelength 1.06µm. The index of refraction of the laser rod is 1.823.. Calculate (1) The difference in frequencies between adjacent modes. (2)The number of the emitted longitudinal mode at this wavelength.7) A Cu target emits an x-ray line of wavelength λ 1.54 Å a. Given that the Bragg angle for reflection from the (111) planes in aluminium (Al) is 19.2º, compute the interplanar distance for these planes. Recall that has an FCC crystal structure. b. Knowing that the density and atomic weight of Al are respectively 2.7 g/cm³ and 27 g. compute the value of the Avogadro number.When x - rays of wavelength of 0.129 nm are incident on the surface of a crystal having a structure similar to that of NaCl, a first - order maximum is observed at 8.15°. Calculate the interplanar spacing of the crystal based on this information.
- 10 mW of light is incident on a piece of GaAs which is 0.2mm thick. The incident light is a mixture of 5mW at A1=1.553µm and 5mW at 12=0.828um. A total of 7mW mixed light exits out of the GaAs. Assume no reflections at the air/GaAs interface and any light generated by recombination won't exit the GaAs. What are the absorption coefficients, a, for two different wavelengths?C1X-ray diffraction analysis (using a Cu anode) of a specimen with a known cubic crystal structure reveals that the peak generated as a result of reflection from the (110) plane occurs at a 20=32°. Determine the unit cell volume of this material
- He:Ne laser operated in threshold condition. Reflection coefficients of the mirrors are: 0.999 and 0.97. Length of the laser is 50 cm. Active medium gain is 1.02. Calculate the Loss factor and the loss coefficient.Tungsten is a very high density, high melting point, and hard metal. These properties are partially due to its body centered cubic (BCC) crystal structure. Tungsten has an atomic number of 74 and an average mass of 183.8u. (1u = 1.661x10-27 kg). X-ray diffraction experiments determine that the Bravais lattice has a characteristic length of 3.155 Å (This means each side of the cube shown below has a length of 0.3155 nm.)What is the density of single-crystalline tungsten? (Give your answer in g/cm.) Note: Single-crystalline indicates that the BCC unit cell repeats indefinitely. In poly-crystalline metals there are multiple domains with boundaries where the crystal structures do not line up. These materials tend to be much more brittle.Tungsten is a very high density, high melting point, and hard metal. These properties are partially due to its body centered cubic (BCC) crystal structure. Tungsten has an atomic number of 74 and an average mass of 183.8u. (1u = 1.661x10-27 kg). X-ray diffraction experiments determine that the Bravais lattice has a characteristic length of 3.155 Å (This means each side of the cube shown below has a length of 0.3155 nm.) How many complete tungsten atoms are there in each BCC unit cell?
- Light shines through atomic hydrogen gas. It is seen that the gas absorbs light readily at a wavelength of 91.63 nm. What is the value of n of the level to which the hydrogen is being excited by the absorption of light of this wavelength? Assume that the most of the atoms in the gas are in the lowest level. (h = 6.626 x 10-34 j . s, c = 3.00 × 108 m/s, 1 eV = 1.60 x 1019 j, the Rydberg constant is R = 1.097 × 107 m-1) 11 14 O 21 O 16Q/4) The laser cavity length is 1 [m]. At one end a convex mirror with radius of curvature of 200 [Cm]. At the other end a concave mirror with radius of curvature of 0.1 [m]. Find if this cavity is stable.Home work 1: Beam of X- rays of A = 0.842A° is incident on a crystal at a grazing angle of 8.35 when the first Bragg's reflection occurs calculate the glancing angle for third order reflection. ImsuenM amsum Home work 2: X- rays with wave length of 0.58 A° are used for calculating d(200) in nickel .The reflection angle is 9.5° when is the size of unit cell Home work 3: The Bragg's angle corresponding to the first order reflection from (111) plane in a crystal is 30 when X- rays of wave length 1.75A° are used, calculate inter atomic spacing. Home work 4: Calculate the wave length that can analyses by a rock salt crystal of spacing d = 2.82 A° in the first order. DialerS