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Laser pumping

About: Laser pumping is a(n) research topic. Over the lifetime, 21114 publication(s) have been published within this topic receiving 303015 citation(s).

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Journal ArticleDOI: 10.1063/1.92959
Abstract: A new type of semiconductor laser is studied, in which injected carriers in the active region are quantum mechanically confined in two or three dimensions (2D or 3D). Effects of such confinements on the lasing characteristics are analyzed. Most important, the threshold current of such laser is predicted to be far less temperature sensitive than that of conventional lasers, reflecting the reduced dimensionality of electronic state. In the case of 3D‐QW laser, the temperature dependence is virtually eliminated. An experiment on 2D quantum well lasers is performed by placing a conventional laser in a strong magnetic field (30 T) and has demonstrated the predicted increase of T0 value from 144 to 313 °C.

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Topics: Quantum dot laser (70%), Quantum well laser (68%), Laser power scaling (64%) ...read more

3,005 Citations


Open accessJournal ArticleDOI: 10.1126/SCIENCE.288.5466.635
28 Apr 2000-Science
Abstract: We stabilized the carrier-envelope phase of the pulses emitted by a femtosecond mode-locked laser by using the powerful tools of frequency-domain laser stabilization. We confirmed control of the pulse-to-pulse carrier-envelope phase using temporal cross correlation. This phase stabilization locks the absolute frequencies emitted by the laser, which we used to perform absolute optical frequency measurements that were directly referenced to a stable microwave clock.

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  • Fig. 4. Cross-correlator. The second-order cross correlation between pulse i and pulse i 1 2 is measured to determine the pulse-to-pulse carrier-envelope phase shift. The components inside the shaded box are enclosed in a vacuum chamber at 300 mTorr to minimize the dispersive effects of air. The number of mirror bounces in both arms are matched, also to minimize phase errors. The second-order cross correlation is measured with two-photon absorption in a GaAsP photodiode.
    Fig. 4. Cross-correlator. The second-order cross correlation between pulse i and pulse i 1 2 is measured to determine the pulse-to-pulse carrier-envelope phase shift. The components inside the shaded box are enclosed in a vacuum chamber at 300 mTorr to minimize the dispersive effects of air. The number of mirror bounces in both arms are matched, also to minimize phase errors. The second-order cross correlation is measured with two-photon absorption in a GaAsP photodiode.
  • Fig. 2. Experimental setup for locking the carrier-envelope relative phase. The femtosecond laser is located inside the shaded box. Solid lines represent optical paths, and dashed lines show electrical paths. The high-reflector mirror is mounted on a transducer to provide both tilt and translation.
    Fig. 2. Experimental setup for locking the carrier-envelope relative phase. The femtosecond laser is located inside the shaded box. Solid lines represent optical paths, and dashed lines show electrical paths. The high-reflector mirror is mounted on a transducer to provide both tilt and translation.
Topics: Carrier-envelope phase (63%), Laser (60%), Frequency comb (59%) ...read more

2,343 Citations


Journal ArticleDOI: 10.1109/JQE.1980.1070479
R. Lang1, Kohroh Kobayashi1Institutions (1)
Abstract: Influences on the semiconductor laser properties of external optical feedback, i.e., return of a portion of the laser output from a reflector external to the laser cavity, have been examined. Experimental observations with a single mode laser is presented with analysis based on a compound cavity laser model, which has been found to explain essential features of the experimental results. In particular, it has been demonstrated that a laser with external feedback can be multistable and show hysteresis phenomena, analogous to those of non-linear Fabry-Perot resonator. It has also been shown that the dynamic properties of injection lasers are significantly affected by external feedback, depending on interference conditions between returned light and the field inside the laser diode.

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Topics: Distributed feedback laser (73%), Laser diode (68%), Laser power scaling (66%) ...read more

2,293 Citations


Journal ArticleDOI: 10.1109/JQE.1982.1071522
Charles H. Henry1Institutions (1)
Abstract: A theory of the spectral width of a single-mode semiconductor laser is presented and used to explain the recent measurements of Fleming and Mooradian on AlGaAs lasers. They found the linewidth to be inversely proportional to power and to have a value of 114 MHz at 1 mW per facet. This value is 30 times greater than can be explained by existing theories. The enhanced linewidth is attributed to the variation of the real refractive index n' with carrier density. Spontaneous emission induces phase and intensity changes in the laser field. The restoration of the laser to its steady-state intensity results in changes in the imaginary part of the refractive index \Delta n" . These changes are accompanied by changes in the real part of the refractive index \Delta n' , which cause additional phase fluctuations and line broadening. The linewidth enhancement is shown to be 1 + \alpha^{2} , where \alpha = \Delta n'/\Delta n" . A value of \alpha \approx 5.4 , needed to explain the observed linewidth, is close to the experimental values of a of 4.6 and 6.2.

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Topics: Laser linewidth (63%), Semiconductor laser theory (56%), Injection seeder (54%) ...read more

2,169 Citations


Open accessJournal ArticleDOI: 10.1038/NATURE06401
20 Dec 2007-Nature
Abstract: Optical frequency combs provide equidistant frequency markers in the infrared, visible and ultraviolet, and can be used to link an unknown optical frequency to a radio or microwave frequency reference. Since their inception, frequency combs have triggered substantial advances in optical frequency metrology and precision measurements and in applications such as broadband laser-based gas sensing and molecular fingerprinting. Early work generated frequency combs by intra-cavity phase modulation; subsequently, frequency combs have been generated using the comb-like mode structure of mode-locked lasers, whose repetition rate and carrier envelope phase can be stabilized. Here we report a substantially different approach to comb generation, in which equally spaced frequency markers are produced by the interaction between a continuous-wave pump laser of a known frequency with the modes of a monolithic ultra-high-Q microresonator via the Kerr nonlinearity. The intrinsically broadband nature of parametric gain makes it possible to generate discrete comb modes over a 500-nm-wide span (approximately 70 THz) around 1,550 nm without relying on any external spectral broadening. Optical-heterodyne-based measurements reveal that cascaded parametric interactions give rise to an optical frequency comb, overcoming passive cavity dispersion. The uniformity of the mode spacing has been verified to within a relative experimental precision of 7.3 x 10(-18). In contrast to femtosecond mode-locked lasers, this work represents a step towards a monolithic optical frequency comb generator, allowing considerable reduction in size, complexity and power consumption. Moreover, the approach can operate at previously unattainable repetition rates, exceeding 100 GHz, which are useful in applications where access to individual comb modes is required, such as optical waveform synthesis, high capacity telecommunications or astrophysical spectrometer calibration.

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Topics: Frequency comb (67%), Comb generator (64%), Carrier-envelope phase (58%) ...read more

1,743 Citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20225
2021148
2020244
2019284
2018272
2017520

Top Attributes

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Topic's top 5 most impactful authors

Ken-ichi Ueda

88 papers, 2.3K citations

Robert L. Byer

60 papers, 4.7K citations

Patrick Georges

56 papers, 929 citations

Uwe Griebner

49 papers, 1.5K citations

Helena Jelínková

45 papers, 360 citations

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