Results 221 to 230 of about 24,731 (260)

Threshold Relations and Diffraction Loss for Injection Lasers

IBM Journal of Research and Development, 1963
Mathematical expressions are derived for the minimum current density necessary to cause stimulated emission in injection lasers. A new type of diffraction loss for a thin light-emitting layer surrounded by light-absorbing material is calculated.
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Diffraction Loss and Beam Size in Lasers with Spherical Mirrors

Journal of the Optical Society of America, 1964
The diffraction loss and beam size of the TEM00 mode in gas lasers have been determined experimentally. The results are in agreement with theoretically predicted values to within the experimental error, except that the increase in beam size with reduction of mirror size was found to be less than predicted.
Taylor, M. J., Hanes, G. R., Baird, K. M.   +2 more
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Diffraction Losses Associated with Tungsten Lamps in in Absolute Radiometry

Applied Optics, 1975
The diffraction losses associated with absolute radiometers were calculated for the case where the source is a tungsten lamp used with a long wavelength suppressing filter. The calculations were done using Blevin's treatment, which assumes a point source and a single diffracting aperture. We have shown that this treatment is sufficiently accurate for a
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Experimental determination of spherical resonator diffraction losses

Optics Communications, 1978
Abstract To obtain single transversal mode oscillation of a laser oscillator a pinhole has to be inserted into the resonator. This causes diffraction losses, comparable with the internal losses of the laser system. For a pulsed Nd-YAG-laser, the total losses and the diffraction losses are determined experimentally as a function of the Fresnel number ...
W. Müller, W. Rudolph, H. Weber
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Experimental investigation of diffraction losses on radio links

IEEE Antennas and Propagation Society International Symposium 1997. Digest, 2002
The requirement for the calculation of microwave link path loss has received considerable attention over time and a number of path loss prediction algorithms have been created. Many of these however are based on theoretical calculations using idealized obstacles so that the actual measured path loss will deviate significantly from calculated values ...
R.G. Mazzolin, J.S. Dahele
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Simple expressions for diffraction loss in open resonators

Microwave and Optical Technology Letters, 1992
AbstractIn this article simple closed‐form are presented expressions to compute the diffraction loss of open resonators composed of spherical mirrors of circular cross‐section. These expressions, which are based on the numerical results of scalar theory, should be useful in designing mirror size for open resonators.
R. K. Arora, R. K. Mongia
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Diffraction losses of Nd:YAG and Yb:YAG laser crystals

Optics & Laser Technology, 2001
Abstract Based on space-dependent rate equations, the lowest threshold input power for a diode end-pumped solid-state laser is obtained for the pump spot size w p →0. However, as the pump beam waist is decreased, the thermally induced effects in the laser rod would be very high.
Wenjie Xie, Young Kwon, Siu-Chung Tam, Yee-Loy Lam   +3 more
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Diffraction loss in the [110] direction in cubic crystals

The Journal of the Acoustical Society of America, 1990
A new ultrasonic measurement model using an angular spectrum of plane waves operating upon a Gauss–Hermite expansion of the transducer field has been used to explain the ultrasonic diffraction loss in the [110] direction in cubic crystals. In the [110] direction, the slowness surface exhibits a saddle point.
Emmanuel P. Papadakis, Frank Margetan, Byron P. Newberry   +2 more
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Experimental investigation of diffraction losses in a laser resonator by means of the diffracted light

Optics Communications, 1984
Abstract In a laser resonator, a part of the diffracted light is picked-off with a knife-edge mirror. It is shown experimentally that the ratio of this picked-off light to the laser output exhibits a linear dependence on the diffraction losses which are varied by changing the mirror spacing.
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Polarization anisotropy of diffraction losses in a laser resonator

Soviet Journal of Quantum Electronics, 1989
A report is given of the first experimental evidence that diffraction losses depend on the polarization of light. The losses are maximal when the polarization is normal to the diffracting edge and minimal for the parallel orientation.
S A Gonchukov, A P Usov
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