Dr. Margarita A. Deneva Profile

Dr. Margarita A. Deneva

at Technical Univ. of Sofia Branch Plovdiv

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 20 June 2021 Presentation + Paper

Modelling of transmission for a stack of two Fizeau wedges with matched parameters

Elena Stoykova, Dimana Nazarova, Marin Nenchev, Margarita Deneva

Proceedings Volume 11783, 117830A (2021) https://doi.org/10.1117/12.2592651

KEYWORDS: Modeling, Reflection, Spectral resolution, Laser spectroscopy, Spectroscopy, Refractive index, Optical spectroscopy, Optical properties, Optical metrology, Laser metrology

Read Abstract +

Proceedings Article | 3 October 2019 Paper

Analysis of Fizeau wedge with a non-air gap by plane wave expansion

Elena Stoykova, Margarita Deneva, Marin Nenchev

Proceedings Volume 11207, 112071V (2019) https://doi.org/10.1117/12.2527464

KEYWORDS: Reflection, Fringe analysis, Wavefronts, Refractive index, Reflectivity, Gaussian beams, Algorithm development, Collimation, Laser spectroscopy, Refraction

Read Abstract +

Proceedings Article | 15 April 2019 Presentation + Paper

Combined implementation of controllable beam splitting and wavelength division multiplexing using tunable interference wedged structures

Margarita Deneva, Marin Nenchev, Elena Stoykova

Proceedings Volume 11029, 110290S (2019) https://doi.org/10.1117/12.2520509

KEYWORDS: Wavelength division multiplexing, Optical components, Collimation, Optical fibers, Photography, Reflectivity, Lenses, Beam splitters, Reflection, Helium neon lasers

Read Abstract +

Proceedings Article | 29 January 2019 Paper

Interference wedged structures as light beam splitting elements

Margarita Deneva, Marin Nenchev, Elena Stoykova

Proceedings Volume 11047, 110471G (2019) https://doi.org/10.1117/12.2516696

KEYWORDS: Beam splitters, Reflectivity, Mirrors, Optical components, Spectral resolution, Gaussian beams, Collimation, Helium neon lasers, Photography, Beam propagation method

Read Abstract +

Proceedings Article | 29 January 2019 Paper

Competitive light wavelength division multiplexing element based on tunable interference wedged structures

Marin Nenchev, Margarita Deneva, Elena Stoykova

Proceedings Volume 11047, 110471F (2019) https://doi.org/10.1117/12.2516698

KEYWORDS: Wavelength division multiplexing, Chemical elements, Mirrors, Optical components, Optical communications, Photography, Reflectivity, Laser applications, Refractive index, Composites

Read Abstract +

Proceedings Article | 9 May 2018 Presentation + Paper

Increase of the free-spectral range by composing a structure from wavelength tunable wedged interferometers

Elena Stoykova, Marin Nenchev, Margarita Deneva

Proceedings Volume 10680, 106801K (2018) https://doi.org/10.1117/12.2307326

KEYWORDS: Interferometers, Spectral resolution, Fringe analysis, Wavelength tuning, Optical components, Gaussian beams

Read Abstract +

Proceedings Article | 15 March 2013 Paper

Study the penetration of IR laser radiation in human teeth: determination of the absorbed and scattered parts

Pepa Uzunova, Stanislava Rabadgiiska, Tzonko Uzunov, Hristo Kisov, Nadejda Kaimakanova, Margarita Deneva, Emil Dinkov, Marin Nenchev

Proceedings Volume 8770, 87701A (2013) https://doi.org/10.1117/12.2014113

KEYWORDS: Teeth, Laser scattering, Light scattering, Absorption, Nd:YAG lasers, Tissues, Scattering, Waveguides, Infrared lasers, Laser dentistry

Read Abstract +

Proceedings Article | 15 March 2013 Paper

Development of a tunable, competition less flash-lamp pumped Nd:YAG laser generated of a chosen pair of two lines

Hristo Kisov, Margarita Deneva, Marin Nenchev

Proceedings Volume 8770, 87701Q (2013) https://doi.org/10.1117/12.2013695

KEYWORDS: Resonators, Prisms, Crystals, Tunable lasers, Nd:YAG lasers, Laser resonators, Q switches, Laser crystals, Q switching, Semiconductor lasers

Read Abstract +

Proceedings Article | 18 January 2011 Paper

New devices for applications in lasers and optical communications based on the wedged interference structures

Nikolay Mindizov, Vera Pashova, Margarita Deneva, Elena Stoykova, Marin Nenchev

Proceedings Volume 7747, 77471I (2011) https://doi.org/10.1117/12.882821

KEYWORDS: Wavelength division multiplexing, Laser applications, Telecommunications, Reflection, Optical communications, Laser resonators, Chemical elements, Mirrors, Reflectivity, Optical components

Read Abstract +

Proceedings Article | 19 December 2008 Paper

All-optical laser spectral narrowing and line fixing at atomic absorption transition by injection competition and gain knock-down techniques

Lazarina Gacheva, Margarita Deneva, Mihail Kalbanov, Marin Nenchev

Proceedings Volume 7027, 70270H (2008) https://doi.org/10.1117/12.822455

KEYWORDS: Absorption, Resonators, Prisms, Amplifiers, Tunable lasers, Laser resonators, Optical amplifiers, Mirrors, Modes of laser operation, Laser amplifiers

Read Abstract +

We present two original, all optical techniques, to produce a narrowline laser light, fixed at the frequency of a chosen reference atomic absorption transition. The first type of systems is an essential improvement of our method ^3,4 for laser spectral locking using a control by two frequency scanned, competitive injections with disturbed power ratio by the absorption at the reference line. The new development eliminates the narrowing limiting problem, related with the fixed laser longitudinal mode structure. We have proposed an original new technique for continuously tunable single mode laser operation in combination with synchronously and equal continuous tuning of the modes of the amplifier. By adapting the laser differential rate equations, the system is analyzed theoretically in details and is shown its feasibility. The results are in agreement with previous our experiments. The essential advantage, except simplicity of realization, is that the laser line can be of order of magnitude and more narrowed than the absorption linewidth. The second system is based of the laser amplifier arrangement with a gain knock-down from the competitive frequency scanned pulse, except at the wavelength of the desired absorption reference line. The essential advantages of the last system are that the problem of fixing laser mode presence is naturally avoided. The theoretical modeling and the numerical investigations show the peculiarity and advantages of the system proposed. The developed approaches are of interest for applications in spectroscopy, in DIAL monitoring of the atmospheric pollutants, in isotope separation system and potentially - for creation of simple, all optical, frequency standards for optical communications. Also, the continuously tunable single mode laser (and the combination with the simultaneously tunable amplifier) presents itself the interest for many practical applications in spectroscopy, metrology, and holography. We compare the action and the advantages of the two systems proposed.

Proceedings Article | 22 April 2005 Paper

Development of original injection-locked linear laser amplifiers: noise characteristics

Ani Ivanova Atanasova, Margarita Deneva, Marin Nenchev

Proceedings Volume 5830, (2005) https://doi.org/10.1117/12.618702

KEYWORDS: Interference (communication), Modulation, Optical amplifiers, Laser amplifiers, Information operations, Dye lasers, Modes of laser operation, Nd:YAG lasers, Amplifiers, Mirrors

Read Abstract +

Proceedings Article | 22 April 2005 Paper

A new approach for tunable subnanosecond pulse generation using an active mirror: theoretical and experimental study

Margarita Deneva, Pepa Uzunova, Marin Nenchev

Proceedings Volume 5830, (2005) https://doi.org/10.1117/12.618708

KEYWORDS: Disk lasers, Dye lasers, Pulsed laser operation, Switching, Q switched lasers, Oscilloscopes, Nd:YAG lasers, Photons, Copper vapor lasers, Amplitude modulation

Read Abstract +

Proceedings Article | 21 June 2004 Paper

Development of diode-pumped Yb³⁺:doped crystal lasers for application in spectroscopy and metrology: two-wavelength and single-mode operation

Jean-Pierre Wallerand, Yann Louyer, Marc Himbert, Margarita Deneva, Marin Nenchev

Proceedings Volume 5449, (2004) https://doi.org/10.1117/12.563101

KEYWORDS: Mirrors, Laser crystals, Reflectivity, Crystals, Semiconductor lasers, Continuous wave operation, Tunable lasers, Laser damage threshold, Ytterbium, Solids

Read Abstract +

Proceedings Article | 21 June 2004 Paper

Development of high-spectral-purity tunable lasers using an auxiliary selected generation

Pepa Uzunova, Margarita Deneva, Naiden Vasilev

Proceedings Volume 5449, (2004) https://doi.org/10.1117/12.563096

KEYWORDS: Tunable lasers, Raman spectroscopy, Mirrors, Dye lasers, Interferometers, Laser development, Laser applications, Light scattering, Output couplers, Reflectivity

Read Abstract +

Proceedings Article | 21 June 2004 Paper

Development of pulsed dual-wavelength lasers: improvement of the tuning characteristics using an active mirror

Pepa Uzunova, Margarita Deneva, Marin Nenchev

Proceedings Volume 5449, (2004) https://doi.org/10.1117/12.563092

KEYWORDS: Disk lasers, Mirrors, Dye lasers, Pulsed laser operation, Optical filters, Linear filtering, Laser resonators, Optical pumping, Laser development, Chemical elements

Read Abstract +

Proceedings Article | 4 November 2003 Paper

Diode-pumped cw Yb:YAG lasers for application in spectroscopy and metrology: single-mode and two-wavelength operation

Yann Louyer, Jean-Pierre Wallerand, Marc Himbert, Margarita Deneva, Marin Nenchev

Proceedings Volume 5226, (2003) https://doi.org/10.1117/12.518894

KEYWORDS: Mirrors, Semiconductor lasers, Reflectivity, Continuous wave operation, Laser metrology, Crystals, Spectroscopy, Metrology, Surgery, Laser applications

Read Abstract +

Proceedings Article | 4 November 2003 Paper

Rectangular laser pulse formation by an interferometer-type device that uses Cr4+:YAG plate

Margarita Deneva, Elisaveta Nikova, Marin Nenchev

Proceedings Volume 5226, (2003) https://doi.org/10.1117/12.518896

KEYWORDS: Pulsed laser operation, YAG lasers, Switching, Mirrors, Q switched lasers, Interferometers, Rectangular pulse, Chromium, Laser cutting, Absorption

Read Abstract +

Proceedings Article | 9 April 2001 Paper

New linear laser amplifiers of a periodically modulated laser radiation based on an injection-locked method

Margarita Deneva, Sevar Saparev, Marin Nenchev, Jean-Pierre Wallerand, Marc Himbert

Proceedings Volume 4397, (2001) https://doi.org/10.1117/12.425107

KEYWORDS: Phase modulation, Modulation, Distortion, Laser amplifiers, Optical amplifiers, Polarization, Laser applications, Continuous wave operation, Fourier transforms, Beam controllers

Read Abstract +

Proceedings Article | 7 May 1999 Paper

Bidirectional passive self-injection locking at an atomic absorption line in a ring Ti3+:Al2O3 laser: temporal characteristics

Margarita Deneva, Marin Nenchev, Rene Barbe, Jean-Claude Keller

Proceedings Volume 3571, (1999) https://doi.org/10.1117/12.347602

KEYWORDS: Absorption, Pulsed laser operation, Mirrors, Switching, Crystals, Computer simulations, Continuous wave operation, Laser crystals, Photons, Reflectivity

Read Abstract +

Proceedings Article | 7 May 1999 Paper

Tunable subnanosecond pulse generation in a ring dye laser bidirectionally pumped by overlapped nanosecond pulses

Andrei Delev, Dimitar Slavov, Margarita Deneva, Elena Stoykova, Marin Nenchev

Proceedings Volume 3571, (1999) https://doi.org/10.1117/12.347599

KEYWORDS: Dye lasers, Pulsed laser operation, Mirrors, Tunable lasers, Picosecond phenomena, Nd:YAG lasers, Laser damage threshold, Electro optics, Q switched lasers, Prisms

Read Abstract +

Proceedings Article | 27 December 1996 Paper

Near-maximum-efficiency two-wavelength Ti:Al2O3 laser using a novel combined PSIL-dual-pulse pumping spectral control

Dimitar Slavov, Margarita Deneva, Elena Stoykova, Marin Nenchev

Proceedings Volume 3052, (1996) https://doi.org/10.1117/12.262914

KEYWORDS: Photons, Reflectivity, Pulsed laser operation, Ions, Mirrors, Dye lasers, Osmium, Molybdenum, Silicon, Information operations

Read Abstract +

Proceedings Article | 27 December 1996 Paper

Improvement of the spectral purity of tunable lasers using a self-selection interferometer cavity: comparison to a conventional cavity

Margarita Deneva

Proceedings Volume 3052, (1996) https://doi.org/10.1117/12.262918

KEYWORDS: Interferometers, Dye lasers, Tunable lasers, Photons, Isotope separation, Laser development, Resonators, Mirrors, Nd:YAG lasers, Spectroscopy

Read Abstract +

Showing 5 of 22 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years