1. |
Vibration quenching of HgBr(X 2&Sgr;+1/2) |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 731-733
H. Helvajian,
C. Wittig,
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摘要:
We report a study of the time evolution of differentgroupsof HgBr (X2&Sgr;+1/2) vibrational level densities which are quenched by collisions with He. Vibrational quenching is efficient down to the lowestv″levels that we are able to monitor, indicating that energy can be efficiently extracted from the HgBr (B→X) laser, even when tuning to frequencies other than those with the highest gain.
ISSN:0003-6951
DOI:10.1063/1.92168
出版商:AIP
年代:1981
数据来源: AIP
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2. |
Return‐current electron streams in high‐intensity laser target interaction |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 734-736
P. A. Jaanimagi,
N. A. Ebrahim,
N. H. Burnett,
C. Joshi,
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摘要:
X‐ray streak photography of the interaction of a nanosecond CO2laser pulse with large‐diameter foil targets shows the presence of an annular x‐ray emitting region which expands away from the focal spot with a veclocity up to 109cm/sec. This region exhibits laser‐polarization‐dependent asymmetry, and it is postulated that it is formed by a return current of fast electrons bombarding the front of the target foil. It appears likely that this phenomenon is responsible in part for anomalous lateral energy transport and magnetic field generation in such experiments.
ISSN:0003-6951
DOI:10.1063/1.92169
出版商:AIP
年代:1981
数据来源: AIP
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3. |
Electrical conductivity of Al‐implanted films of ZnS |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 736-738
C. B. Thomas,
H. S. Reehal,
A. J. Warren,
J. M. Gallego,
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摘要:
Films of ZnS have been deposited by rf sputtering and subsequently implanted with Al. Examination of the conductivities, after annealing, shows that Al is effective in decreasing the film resistivity. At ∼ 300 K the room‐temperature conductivity could be reduced to 10−2&OHgr;−1 cm−1compared with 10−10&OHgr;−1 cm−1in undoped films. The small activation energy of ∼ 0.1 eV of the electrical conductivity and the temperature dependence of the thermoelectric power may possibly be indicative of impurity conduction.
ISSN:0003-6951
DOI:10.1063/1.92170
出版商:AIP
年代:1981
数据来源: AIP
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4. |
Synchronously pumped mode‐locked CdS platelet laser |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 738-740
C. B. Roxlo,
M. M. Salour,
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摘要:
We report pulses as short as 8 ps obtained from a mode‐locked cw optically‐pumped semiconductor laser. The sample was a CdS platelet at a temperature of 95 K longitudinally pumped by a mode‐locked Ar+laser. The output power was 3.2 mW with 8‐ps pulses, and powers greater than 10 mW have been observed with 10‐ps pulses. Laser performance is quite independent of cavity length as compared to synchronously pumped dye lasers, indicating that passive pulse shaping may be taking place.
ISSN:0003-6951
DOI:10.1063/1.92171
出版商:AIP
年代:1981
数据来源: AIP
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5. |
Optical time domain reflectometer for single‐mode fiber at selectable wavelengths |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 740-742
B. S. Kawasaki,
K. O. Hill,
D. C. Johnson,
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摘要:
Optical time domain reflectometry by backscattered light in a single‐mode fiber is demonstrated. The experiment employs a novel efficient single‐mode/multimode coupling device and also a powerful and versatile multiwavelength mode‐locked and pulsed optical source.
ISSN:0003-6951
DOI:10.1063/1.92147
出版商:AIP
年代:1981
数据来源: AIP
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6. |
Low‐order TE0qoperation of a CO2laser for transmission through circular metallic waveguides |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 743-745
M. E. Marhic,
E. Garmire,
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摘要:
We report the separate TE01and TE02operation of a CO2laser in a hybrid oscillator formed by placing a circular metallic waveguide and a focusing lens inside the cavity of an otherwise conventional laser. With the TE01output focused into a passive waveguide outside the cavity, transmission in excess of 90% has been measured through a 31‐cm‐long, 0.5‐mm‐i.d. straight metallic tube. Bending increased the losses far more than originally anticipated.
ISSN:0003-6951
DOI:10.1063/1.92172
出版商:AIP
年代:1981
数据来源: AIP
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7. |
Absolute two‐photo fluorescence with low‐power cw lasers |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 745-747
Ida M. Catalano,
Aldo Cingolani,
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摘要:
A method for absolute two‐photon cross‐section‐value &ggr;2evaluation by means of one‐ and two‐photon fluorescence comparative measurements and using a low‐power, single‐mode cw laser is presented. This method is applied to a rhodamine B solution. The experimental value &ggr;2we obtained is compared with previous experimental data measured by a high‐power laser source.
ISSN:0003-6951
DOI:10.1063/1.92173
出版商:AIP
年代:1981
数据来源: AIP
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8. |
Interferometric measurements with laser FM sidebands |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 747-749
G. C. Bjorklund,
K. Jain,
J. D. Hope,
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摘要:
Hysteresis in piezoelectric transducers down to 20 A˚ and gas pressure changes as small as 10 mTorr are measured by locking a laser FM sideband to an interferometer resonance. In addition, rapid monitoring of large excursion motions with 200‐A˚ accuracy is achieved using an ’’optical frequency comb’’ consisting of multiple FM sidebands.
ISSN:0003-6951
DOI:10.1063/1.92174
出版商:AIP
年代:1981
数据来源: AIP
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9. |
Amplified spontaneous‐emission quantum beats in flash‐pumped H20 vapor |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 750-751
Nabil M. Lawandy,
D. W. Robinson,
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摘要:
Flashlamp excitation of H2O vapor in the 10–80‐mTorr pressure range has produced a population inversion on the (001), g = 3, 954−945transition. This has resulted in a modulated emission at 115 cm−1. The oscillations on the amplified spontaneous‐emission signal are interpreted as quantum beats between magnetic hyperfine levels split by anI⋅Jinteraction. Analysis of the data results in a splitting of 1.4 MHz and dephasing rates of 7.8 MHz/Torr for H2O‐H2O, 0.5 MHz/Torr for He‐H2O, and 1.7 MHz/Torr for Ar‐H2O mixtures.
ISSN:0003-6951
DOI:10.1063/1.92148
出版商:AIP
年代:1981
数据来源: AIP
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10. |
Optical bistability using a magneto‐optic modulator |
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Applied Physics Letters,
Volume 38,
Issue 10,
1981,
Page 752-754
Shinsuke Umegaki,
Hiroaki Inoue,
Toshihiko Yoshino,
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摘要:
Optical bistability is realized using a Faraday rotator which has a high rotating power owing to multiple reflections in a planar glass plate. The linearly polarized light is modulated by the coil current of the electromagnet. Optical hysteresis is observed when the current is changed in proportion to the intensity of the light transmitted through the modulator. An application of this device to stabilizing the light intensity of the cw laser intensity is described.
ISSN:0003-6951
DOI:10.1063/1.92149
出版商:AIP
年代:1981
数据来源: AIP
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