A mode-locked laser has a Gaussian pulse width of 100fs. If the center wavelength is 800nm what is the bandwidth assuming the pulses are transform limited (in nm)?
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- If STM is to detect surface features with local heights of about 0.0200 nm, what percent change in tunneling-electron current must the STM electronics be able to detect? Assume that the tunneling-electron current has characteristics given in the preceding problem.He–Ne lasers are often used in physicsdemonstrations. They produce light of wavelength 633 nm and a powerof 0.500 mW spread over a cylindrical beam 1.00 mm in diameter(although these quantities can vary). What is the average energy density in the laser beam?A laser produces light of wavelength 725 nm in an ultrashortpulse. What is the minimum duration of the pulse if the minimum uncertaintyin the energy of the photons is 1.0%?
- For a He-Ne laser at 1 m and 2 m distances from the laser the output beam spot diameters are 4mm and 6mm respectively, calculate the divergence and explain?A CdTe planar wafer has an absorption coefficient of 3.2 × 10^4??−1for light ofwavelength 530 nm Determine the minimum thickness the CdTe wafer has to be for 95% of this wavelength to beabsorbed.a) Problem 9.6 of Textbook: If the spot size at the mirror of a helium-neon laser is 0.5mm, what is the length of the laser cavity? The cavity is of the confocal-type and the wavelength is 633nm. b) For a semiconductor laser diode, the output power is 2mW and 4.5mW when the diode drive (injected) current is 50mA and 55mA, respectively. What is the threshold current (ith) of this laser diode? 4.
- Given a channel with an intended capacity of 50 Mbps, the bandwidth of the channel is 4 MHz. Assuming white thermal noise, what signal-to-noise ratio is required to achieve this capacity?A spectrometer can resolve spectral in the visible region(wavelenth=6000Ao) when separated by change in wavelength=0.1Ao what will be the magnitude of magnetic field required to confirm experimentally the normal Zeeman effect.A Narrow Band Frequency Modulated signal, with fm =10 kHz, fa =100 MHz, Af; = 5SKHZ is applied to a frequency multiplier with a factor of 3 to convert it to a Wide band FM signal, the output of the multiplier has a WBFM with,
- An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537cm-1. a) If it is to be based on first-order interference, what should be the thickness of the dielectric layer(refractive index of 1.34)? b) What other wavelength would be transmitted?What is the minimum angular spread of a 633-nmwavelength He-Ne laser beam that is originally 1.00 mm indiameter?(b) If this laser is aimed at a mountain cliff 15.0 km away, howbig will the illuminated spot be?(c) How big a spot would be illuminated on the Moon,neglecting atmospheric effects? (This might be done to hit acorner reflector to measure the round-trip time and, hence,distance.) Explicitly show how you follow the steps inProblem-Solving Strategies for Wave Optics(a) What is the minimum angular spread of a 633-nm wavelength He-Ne laser beam that is originally 1.00 mm in diameter? (b) If this laser is aimed at a mountain cliff 15.0 km away, how big will the illuminated spot be? (c) How big a spot would be illuminated on the Moon, neglecting atmospheric effects? (This might be done to hit a corner reflector to measure the round-trip time and, hence, distance.)