XIII. GRAVITATION RESEARCH Academic and Research Staff Prof
... the ultimate width of the observed resonance lines was made possible by a measurement of the lifetime of the 12 excited state in the beam, and was found to be 3+0.5 Fsec. It is anticipated, therefore, that the resonance lines should then be ~50 kHz wide. Further information on the experiment and the ...
... the ultimate width of the observed resonance lines was made possible by a measurement of the lifetime of the 12 excited state in the beam, and was found to be 3+0.5 Fsec. It is anticipated, therefore, that the resonance lines should then be ~50 kHz wide. Further information on the experiment and the ...
Chapter 11 Laser
... corresponding to the energy difference E. The ratio of the numbers nE and n0, that is, the ratio of the populations of the energy levels, will increase. Since the population of the normal state was so much larger than that of the excited state, an enormously intense beam of light would be required t ...
... corresponding to the energy difference E. The ratio of the numbers nE and n0, that is, the ratio of the populations of the energy levels, will increase. Since the population of the normal state was so much larger than that of the excited state, an enormously intense beam of light would be required t ...
Experimental Quantum Correlations in Condensed Phase
... D.K. Das, D. Roy, P. Kumar, D.K. Das, D. Mondal, K. Makhal, S. Dhinda, S. Singhal, S. Bandyopaphyay, G. K. Shaw… ...
... D.K. Das, D. Roy, P. Kumar, D.K. Das, D. Mondal, K. Makhal, S. Dhinda, S. Singhal, S. Bandyopaphyay, G. K. Shaw… ...
0.26-Hz-linewidth ultrastable lasers at 1557 nm
... performance of the lasers. Here we demonstrate two ultrastable lasers at 1557 nm with a most probable linewidth of 0.26 Hz by independently frequency-stabilizing to the resonance of 10-cm-long ultrastable Fabry-Pérot cavities at room temperature. The fractional frequency instability of each laser sy ...
... performance of the lasers. Here we demonstrate two ultrastable lasers at 1557 nm with a most probable linewidth of 0.26 Hz by independently frequency-stabilizing to the resonance of 10-cm-long ultrastable Fabry-Pérot cavities at room temperature. The fractional frequency instability of each laser sy ...
INFRA-RED OPTICAL COMMUNICATION SYSTEMS*
... for an infra-red system at wavelengths longer than 1 p, with somewhat higher capacity below this wavelength. Of course, many different wavelengths can be transmitted along the system simultaneously, and dispersive optics used to feed-in and feed-out each channel at either end. Using fibre optical gu ...
... for an infra-red system at wavelengths longer than 1 p, with somewhat higher capacity below this wavelength. Of course, many different wavelengths can be transmitted along the system simultaneously, and dispersive optics used to feed-in and feed-out each channel at either end. Using fibre optical gu ...
Soliton pairs in a fiber laser: from anomalous to normal average
... K. Tamura, E. P. Ippen, H. A. Haus, and L. E. Nelson, “77-fs pulse generation from a stretched-pulse mode-locked all-fiber ring laser,” Opt. Lett. 18, 1080-1082 (1993). ...
... K. Tamura, E. P. Ippen, H. A. Haus, and L. E. Nelson, “77-fs pulse generation from a stretched-pulse mode-locked all-fiber ring laser,” Opt. Lett. 18, 1080-1082 (1993). ...
d) Laser system and its applications Question Bank
... Q.14: Derive the Planck’s radiation formula and show that the Rayleigh-Jeans law can be obtained from it as a limiting form. Q.15: Obtain Wien’s displacement law using the Planck’s radiation formula. Show that the total energy density for a black-body radiation is proportional to T4. Q.16: Derive t ...
... Q.14: Derive the Planck’s radiation formula and show that the Rayleigh-Jeans law can be obtained from it as a limiting form. Q.15: Obtain Wien’s displacement law using the Planck’s radiation formula. Show that the total energy density for a black-body radiation is proportional to T4. Q.16: Derive t ...
LASER
... light is emitted as a relatively narrow beam in a specific direction. Ordinary light, such as from a light bulb, is emitted in many directions away from the source. The light from a laser is said to be coherent, which means that the wavelengths of the laser light are in phase in space and time. Ordi ...
... light is emitted as a relatively narrow beam in a specific direction. Ordinary light, such as from a light bulb, is emitted in many directions away from the source. The light from a laser is said to be coherent, which means that the wavelengths of the laser light are in phase in space and time. Ordi ...
Ultralow threshold laser using a single quantum dot and a
... To determine whether our device is capable of exhibiting laser action, we cannot use the conventional, macroscopic definition of threshold, that the gain of the optical mode equals the cavity losses. Instead, we follow the alternative definition given by Björk, Karlsson, and Yamamoto, that the mean ...
... To determine whether our device is capable of exhibiting laser action, we cannot use the conventional, macroscopic definition of threshold, that the gain of the optical mode equals the cavity losses. Instead, we follow the alternative definition given by Björk, Karlsson, and Yamamoto, that the mean ...
Mode-locking
Mode-locking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10−12 s) or femtoseconds (10−15 s).The basis of the technique is to induce a fixed-phase relationship between the longitudinal modes of the laser's resonant cavity. The laser is then said to be 'phase-locked' or 'mode-locked'. Interference between these modes causes the laser light to be produced as a train of pulses. Depending on the properties of the laser, these pulses may be of extremely brief duration, as short as a few femtoseconds.