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Tuesday, November 17, 2020 | History

2 edition of Excess noise in tunable diode lasers found in the catalog.

Excess noise in tunable diode lasers

Carroll W Rowland

Excess noise in tunable diode lasers

  • 270 Want to read
  • 40 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Lasers,
  • Superheterodyne receivers

  • Edition Notes

    StatementCarroll W. Rowland
    SeriesNASA technical paper -- 1935
    ContributionsLangley Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
    The Physical Object
    Pagination13 p. :
    Number of Pages13
    ID Numbers
    Open LibraryOL14933042M

    An illustration of an open book. Books. An illustration of two cells of a film strip. NASA Technical Reports Server (NTRS) Reliability improvements in tunable Pb1-xSnxSe diode lasers bulk materials are shown to have electrical contact resistance values that are stable for shelf storage periods well in excess of one year.   Tunable diode laser absorption spectroscopy (TDLAS), representing linear spectroscopy. Pump-probe spectroscopy, as an example of nonlinear and ultrafast techniques. Stimulated Raman scattering (SRS) microscopy, standing for all laser scanning imaging applications. Carrier-envelope offset (CEO) stabilization, as an example of laser locking methods. The ability to control the frequency of an external-cavity diode laser (ECDL) is an essential component for undergraduate laboratories and atomic physics research. Typically, the housing for the EC. Ultra low-noise laser diode modules stay stable over changes in temperature and will not develop mode-hop noise during their lifetime. With ultra low-noise capability, the spatial qualities of the laser beam do not change, allowing the beam to be focused on the same spot size, profile, and shape.


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Excess noise in tunable diode lasers by Carroll W Rowland Download PDF EPUB FB2

The method and the apparatus for identifying excess-noise regions in tunable diode lasers are described. These diode lasers exhibit regions of excess noise as their wavelength is tuned. If a tunable diode laser is to be used as a local oscillator in a superheterodyne optical receiver, these excess-noise regions severely degrade the performance of the by: 1.

Here, we investigate and measure the excess phase noise of widely tunable external cavity diode lasers, which have been used in a range of recent nano-optomechanical experiments, including ground-state cooling.

We report significant excess frequency noise, with peak values on the order of 10^7 rad^2 Hz near GHz, attributed to the diode Cited by: 1. In this paper, we investigate and measure the excess phase noise of widely tunable external cavity diode lasers, which have been used in a range of recent nano-optomechanical experiments, including ground-state by: excess noise of the SGDBR device.

Experiment setup The experimental setup is depicted in Fig. 1(a). The transmitter employed two DFB lasers and one SGDBR laser, all with different phase noise characteristics, while the receiver local oscillator (LO) was a narrow linewidth external cavity laser (ECL). The QAM driving.

The excess linewidth broadening of continuously tunable InGaAsP/InP laser diodes at μm wavelength is investigated. Terminal electrical and FM noise measurements indicate that the recombination processes in the forward biased Excess noise in tunable diode lasers book region produce significant 1/ f carrier noise.

Below 1 MHz the 1/ f noise dominates yielding a noise enhancement of about 30 dB at 1 by: A comparison of measured and predicted signal‐to‐noise ratio is made in an optical heterodyne spectrometer utilizing a tunable diode laser which exhibited excess noise.

It is shown that good agreement between predicted and measured signal‐to‐noise ratios results if excess noise effects due to tunable diode lasers are included in the predictions. A comparison of measured and predicted signal-to-noise ratio is made in an optical heterodyne spectrometer utilizing a tunable diode laser which exhibited excess noise.

It is shown that good agreement between predicted and measured signal-to-noise ratios results if excess noise effects due to tunable diode lasers are included in the predictions. The methods used to quantify excess noise.

We investigate the effects of different phase noise processes of SGDBR laser on coherent systems. The SGDBR device operated well with QPSK modulation at 5 Gbaud, while the performance of QAM was significantly degraded due to excess noise. The white FM noise mainly defines the ultimate performance of coherent reception, but the low frequency excess noise can potentially degrade the.

Tunable Diode Laser Spectroscopy METTLER TOLEDO Collected Applications Soon after the first semiconductor diode laser was developed in by US groups at the General Electric Research Center and at the IBM T J Watson Research Center, diode laser spectroscopy began to be used for the detection, identification, and measurement of molecular.

Tunable single-frequency diode lasers utilize a laser diode and a frequency selective element like a grating for laser frequency selection and tuning. They are available for individual wavelengths between nm and nm, and deliver narrow-linewidth emission that is tunable – in some systems up to nm wide without a single mode-hop.

The method and the apparatus for identifying excess-noise regions in tunable diode lasers are described. These diode lasers exhibit regions of excess noise as their wavelength is tuned.

If a tunable diode laser is to be used as a local oscillator in a superheterodyne optical receiver, these excess-noise regions severely degrade the performance.

Tunable, Widely Tunable, and Externally Modulated Lasers Two- and Three-Section In-plane DBR Lasers Widely Tunable Diode Lasers Other Extended Tuning Range Diode Laser Implementations Externally Modulated Lasers Semiconductor Optical Amplifiers Transmitter Arrays Advanced.

Cavity opto-mechanical cooling via radiation pressure dynamical backaction enables ground state cooling of mechanical oscillators, provided the laser exhibits sufficiently low phase noise. Here, we investigate and measure the excess phase noise of widely tunable external cavity diode lasers, which have been used in a range of recent nano-optomechanical experiments, including.

Tunable diode laser absorption spectroscopy (TDLAS) and quantum cascade laser and spectral broadening have been extensively studied and discussed in several books and This ensures minimization of backscattering of photons into the laser which can severely increase the laser's excess noise.

In case of fiber‐coupled lasers. A wide variety of applications require tunable single-frequency operation of a laser system. In the world of diode lasers, there are currently four main configurations to obtain a single-frequency output: external cavity laser (ECL), distributed feedback (DFB), volume.

Since the first edition of this book was published inthe photonics landscape has evolved considerably and so has the role of distributed feedback (DFB) laser diodes.

Although tunable laser diodes continue to be introduced in advanced optical communication systems, DFB laser diodes are still widely applied in many deployed systems.

Abstract. Spectroscopic measurements using tunable laser heterodyne spectrometers in the 3–30 micron range of the spectrum have the potential to measure the vertical profiles of tenuous gas molecules in the atmosphere with ultra high spectral resolution (∆υ ≤ cm-1) and high sensitivity [1].At the NASA Langley Research Center (LaRC), the technology and system level development for.

Tunable lasers are vital components within every transponder of modern coherent optical communications systems [1][2] [3] [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].To date, narrow.

Tunable Laser Diodes and Related Optical Sources Book Abstract: The phenomenal growth in Internet traffic has lead to a huge increase in demand for data transmission capacity on a worldwide level. As a result, wavelength division multiplexing (WDM) technology emerged, which makes it possible to transmit a large number of optical channels on a.

Journals & Books; Help In the first case the detection limit is determined by the laser amplitude excess noise, while in the other two cases this noise contribution is limited with respect to detector-induced shot noise, and thermal and RAM noises. The possibility of detection of air pollutants with tunable diode lasers was demonstrated.

The effect of the excess noise on the laser operation of Fabry-Perot and distributed feedback (DFB) lasers is discussed. We use the semiclassical analysis based on the Fokker-Planck equation corresponding to the set of coupled Langevin equations. The stationary and nonstationary solution of the single-mode operation is obtained.

As with other near-IR lasers we have used, this laser is quiet: excess (1/f) noise is low and drops off at fairly low frequencies compared to lead salt or AlGaAs lasers we have observed.

At 2 f ( kHz), the noise is − dB below the dc level and decreases another 11 dB at frequencies in the 2–MHz range, where high-frequency WMS (or. Abstract: Tunable diode laser absorption spectroscopy (TDLAS), as a noninvasive spectroscopic method, permits high-resolution, high-sensitivity, fast, in situ absorption measurements of atomic and molecular species and narrow spectral features in gaseous, solid, and liquid phases.

Advances in new diode laser sources and laser spectroscopic techniques generally have triggered an increasing. The objective of this book is to give a complete account, as of earlyof the state of the art of monolithic tunable laser diodes and their applications.

It is the authors' objective to include all relevant material and to provide a balanced presentation of the underlying theoretical aspects and practical issues of tunable laser diodes. An Investigation and Reduction of Electro-Optical Noise in Tunable Diode Laser Samira Mahdi* 1, Youhua Chen 2, Gary Anderson 3 1.

Department of Applied Science, University of Arkansas at Little Rock, ARFaculty member in the Physics Department, College of. Tunable External Cavity Diode Lasers Figure 1.

Laser diode placed into an external cavity. The anti-reflection coating prevets the diode fron self lasing Figure 2: Tunable external-cavity diode lasers in Littrow and Littman-Metcalf configuration Littman-Metcalf vs. Littrow Configurations There are advantages and disadvantages to both the.

Tunable diode laser absorption spectroscopy (TDLAS) utilizes the absorption phenomena to measure the temperature and species concentration. The main features of the TDLAS technique are its fast response and high sensitivity.

Extensive research has been performed on the utilization of diode laser absorption spectroscopy for the system monitoring and its control. In fact, the laser diode has become by far the most common laser type, with truly massive use throughout telecommunications and data storage (e.g., DVDs, CDs).

In a laser diode, current flow creates charge carriers (electrons and holes) in a p-n junction. These combine and emit light through stimulated emission.

The low-frequency noise characteristics of several stripe-geometry Pb-salt semiconductor diode lasers were investigated in the 4–μm spectral region.

Excess noise is observed to vary as the ratio of I/It, where I is the injection current and It is the threshold value at which lasing action begins. The magnitude of the diode laser excess noise has been measured to be 24 dB above shot noise.

Amann, M.-C. () Phase noise limited resolution of coherent LIDAR using widely tunable laser diodes; Electronics Lett – ADS CrossRef Google Scholar Amann, M.-C., Schimpe, R. () Excess linewidth broadening in wavelength tunable laser diodes; Electronics Lett – CrossRef Google Scholar.

However, for the monolithic tunable lasers, the electronic tuning mechanism is commonly used and can achieve fast tuning speed (~ns) [2]. Due to the carrier noise in the passive sections, the. Handbook of Distributed Feedback Laser Diodes, Second Edition-Geert Morthier Since the first edition of this book was published inthe photonics landscape has evolved considerably and so has the role of distributed feedback (DFB) laser diodes.

Although tunable laser diodes. The dependence of excess noise in the radiation from c.w. d.h. GaAlAs-diode lasers as a function of d.c.-pump current has been investigated at microwave frequencies (1 and 4 GHz) in the temperature range from?30?C to +20?C.

Measurements are compared to the results of excess-noise computations obtained from a simple, analytical, laser model. A tunable external-cavity laser (ECL) (Fig. 1) comprises an optical gain medium (a laser diode with antireflection coatings on one or both facets), optics for coupling the output of the gain-medium waveguide to the free-space mode of the external cavity, one or more wavelength-selective filters, and one or more mirrors for defining an external feedback path, possibly with a piezoelectric.

Distributed feedback (DFB) semiconductor lasers emit light in a single mode which is essential to providing the carrier in long haul high bit-rate optical communication systems.

This comprehensive research monograph provides: thorough analysis of the operation and design of DFB lasers a high level of tutorial discussion with many valuable appendices the first full account of time-domain.

These gas-phase lasers use a discretely line-tunable carbon dioxide (CO 2) laser to excite a specific rotational-vibrational (ro-vibrational) transition in a specific molecular gas to create a rotational population inversion within a tunable cavity. These lasers generate appreciable power (up to mW) and exhibit a narrow linewidth (Δν.

Intensity noise is usually understood to quantify fluctuations of the laser output power (not actually an optical intensity), and in most cases normalized to the average power. The measurement is based on recording the temporally varying output power, using a photodiode, for example.

The normalization is the simplest aspect; other aspects, to be discussed in the following, are more subtle. A comparison of measured and predicted signal-to-noise ratio is made in an optical heterodyne spectrometer utilizing a tunable diode laser which exhibited excess noise.

It is shown that good agreement between predicted and measured signal-to-noise ratios results if excess noise effects due to tunable diode lasers are included in the predictions.

The Springer Handbook of Lasers and Optics provides fast, up-to-date, comprehensive and authoritative coverage of the wide fields of optics and lasers. It is written for daily use in the office or laboratory and offers explanatory text, data, and references needed for anyone working with lasers and optical chapter or section is authored by respected experts and contains the 5/5(2).

The high sensitivity is obtained by conducting the spectral measurements at frequencies that are high enough to greatly reduce excess laser noise. The technique is implemented by rapidly modulating the laser wavelength and performing phase-sensitive photodetection at a harmonic of.

This book will cover a particular component, tunable lasers, which is the next "big thing" in DWDM. The primary market are engineers developing tuneable lasers for optical networks, as well as graduate students enrolled in the optical engineering curriculum, especially: optical communication, semiconductor lasers, optical networks, and/or.nm DFB Laser Diode, 6mW, for Hydrogen Chloride Sensing (HCl) // UNBIASED LASER DIODE SELECTION GUIDE, Compare All Top Brands for All Applications at S + Laser Diodes.A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".

The first laser was built in by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur.