Imperial College London

ProfessorMichaelDamzen

Faculty of Natural SciencesDepartment of Physics

Professor of Experimental Laser Physics
 
 
 
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Contact

 

+44 (0)20 7594 7783m.damzen Website

 
 
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Location

 

610Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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288 results found

Damzen MJ, Thomas GM, Minassian A, 2017, Diode-side-pumped Alexandrite slab lasers, OPTICS EXPRESS, Vol: 25, Pages: 11622-11636, ISSN: 1094-4087

JOURNAL ARTICLE

Parali U, Sheng X, Minassian A, Tawy G, Sathian J, Thomas GM, Damzen MJet al., 2017, Diode-pumped Alexandrite laser with passive SESAM Q-switching and wavelength tunability, Optics Communications, ISSN: 0030-4018

© 2017 Elsevier B.V. We report the first experimental demonstration of a wavelength tunable passively Q-switched red-diode-end pumped Alexandrite laser using a semiconductor saturable absorber mirror (SESAM). We present the results of the study of passive SESAM Q-switching and wavelength-tuning in continuous diode-pumped Alexandrite lasers in both linear cavity and X-cavity configurations. In the linear cavity configuration, pulsed operation up to 27 kHz repetition rate in fundamental TEM00 mode was achieved and maximum average power was 41 mW. The shortest pulse generated was 550 ns (FWHM) and the Q-switched wavelength tuning band spanned was between 740 nm and 755 nm. In the X-cavity configuration, a higher average power up to 73 mW, and obtained with higher pulse energy 6.5μJ at 11.2 kHz repetition rate, in fundamental TEM00 mode with excellent spatial quality M2 < 1.1. The Q-switched wavelength tuning band spanned was between 775 nm and 781 nm.

JOURNAL ARTICLE

Parali U, Thomas GM, Minassian A, Sheng X, Damzen MJet al., 2017, Wavelength tunable passively Q-switched Alexandrite laser with direct diode-pumping at 635 nm, 5th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS), Publisher: SCITEPRESS, Pages: 82-89

We report on a wavelength tunable passively Q-switched Alexandrite laser directly red-diode-pumped at 635 nm. Passive Q-switching was achieved with a semiconductor saturable absorber mirror (SESAM) and wavelength tuning with a birefringent tuner. The pulse repetiton rate was variable on the pump power and wavelength and a maximum 27 kHz rate was achieved in fundamental TEM00 mode. The maximum average output power obtained was 41 mW. The Q-switched wavelength tuning band was studied between 740 nm and 755 nm. To the best of our knowledge, this is the first time that tunable TEM00 passive Q-switched operation of a diode-pumped Alexandrite laser has been achieved. The results obtained in this study can be significantly further optimised for performance. A new cavity configuration for this optimisation is described. Future work is expected to lead to the development of higher power, more efficient tunable passive Q-switched (and potentially passive mode-locked) diode-pumped Alexandrite la (More)

CONFERENCE PAPER

Arbabzadah EA, Damzen MJ, 2016, Fibre-coupled red diode-pumped Alexandrite TEM00 laser with single and double-pass end-pumping, LASER PHYSICS LETTERS, Vol: 13, ISSN: 1612-2011

JOURNAL ARTICLE

Damzen M, Thomas G, Teppitaksak A, Arbabzadah E, Kerridge-Johns W, Minassian Aet al., 2016, Diode-pumped alexandrite laser - A new prospect for remote sensing

© 2015 IEEE. Tunable-wavelength diode-pumped Alexandrite laser operation includes highest power > 26W (end-pumped rod); > 12W (side-pumped slab); and first Q-switched operation with pulse energy ∼ 1mJ at kHz repetition rate, as development for space lidar application.

CONFERENCE PAPER

Kerridge-Johns WR, Damzen MJ, 2016, Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 33, Pages: 2525-2534, ISSN: 0740-3224

JOURNAL ARTICLE

Loiko PA, Arbabzadah EA, Damzen MJ, Mateos X, Dunina EB, Kornienko AA, Yasukevich AS, Skoptsov NA, Yumashev KVet al., 2016, Judd-Ofelt analysis and stimulated-emission cross-sections for highly doped (38 at%) Er:YSGG laser crystal, JOURNAL OF LUMINESCENCE, Vol: 171, Pages: 226-233, ISSN: 0022-2313

JOURNAL ARTICLE

Thomas GM, Minassian A, Sheng X, Damzen MJet al., 2016, Diode-pumped Alexandrite lasers in Q-switched and cavity-dumped Q-switched operation, OPTICS EXPRESS, Vol: 24, Pages: 27212-27224, ISSN: 1094-4087

JOURNAL ARTICLE

Kerridge-Johns WR, Damzen MJ, 2015, Analysis of pump excited state absorption and its impact on laser efficiency, LASER PHYSICS LETTERS, Vol: 12, ISSN: 1612-2011

JOURNAL ARTICLE

Murphy FJ, Arbabzadah EA, Bak AO, Amrania H, Damzen MJ, Phillips CCet al., 2015, Optical chopper Q-switching for flashlamp-pumped Er,Cr:YSGG lasers, Laser Physics Letters, Vol: 12, ISSN: 1612-202X

JOURNAL ARTICLE

Teppitaksak A, Thomas GM, Damzen MJ, 2015, Investigation of a versatile pulsed laser source based on a diode seed and ultra-high gain bounce geometry amplifiers, OPTICS EXPRESS, Vol: 23, Pages: 12328-12336, ISSN: 1094-4087

JOURNAL ARTICLE

Thomas GM, Minassian A, Teppitaksak A, Damzen MJet al., 2015, High energy Q-switching and cavity dumped Q-switching of a diode-pumped alexandrite laser

© OSA 2015. We present 3mJ Q-switched and 0.5mJ cavity dumped Q-switched pulse energies from a diode-pumped Alexandrite laser operating at 758nm. Preliminary results of second harmonic generation to the UV (379nm) with ∼47% conversion efficiency are reported.

CONFERENCE PAPER

Arbabzadah EA, Kerridge-Johns W, Thomas GM, Minassian A, Damzen MJet al., 2014, High efficiency TEM<inf>00</inf> diode end-pumped alexandrite laser

CONFERENCE PAPER

Arbabzadah EA, Kerridge-Johns W, Thomas GM, Minassian A, Damzen MJet al., 2014, High efficiency TEM<inf>00</inf> diode end-pumped alexandrite laser

CONFERENCE PAPER

Arbabzadah EA, Shardlow PC, Minassian A, Damzen MJet al., 2014, Pulse control in a Q-switched Nd:YVO4 bounce geometry laser using a secondary cavity, OPTICS LETTERS, Vol: 39, Pages: 3437-3440, ISSN: 0146-9592

JOURNAL ARTICLE

Teppitaksak A, Minassian A, Thomas GM, Damzen MJet al., 2014, High efficiency > 26 W diode end-pumped Alexandrite laser, OPTICS EXPRESS, Vol: 22, Pages: 16386-16392, ISSN: 1094-4087

JOURNAL ARTICLE

Teppitaksak A, Thomas GM, Damzen MJ, 2014, Gain-switched diode laser seeding of ultra-high-gain Nd: YVO<inf>4</inf> bounce amplifier system as a versatile pulsed laser source

CONFERENCE PAPER

Teppitaksak A, Thomas GM, Damzen MJ, 2014, Gain-switched diode laser seeding of ultra-high-gain Nd: YVO<inf>4</inf> bounce amplifier system as a versatile pulsed laser source

CONFERENCE PAPER

Thomas GM, Minassian A, Damzen MJ, 2014, Directly diode-side-pumped Alexandrite slab lasers in the bounce geometry and optical vortex generation

CONFERENCE PAPER

Thomas GM, Minassian A, Damzen MJ, 2014, Directly diode-side-pumped Alexandrite slab lasers in the bounce geometry and optical vortex generation

CONFERENCE PAPER

Arbabzadah EA, Phillips CC, Damzen MJ, 2013, Free-running and Q-switched operation of a diode pumped Er:YSGG laser at the 3 mu m transition, APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 111, Pages: 333-339, ISSN: 0946-2171

JOURNAL ARTICLE

Arbabzadah EA, Shardlow PC, Damzen MJ, 2013, Laser Pulse Control of a Q-switched Nd:YVO4 Bounce Geometry Laser using a Secondary Cavity, Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Publisher: IEEE

CONFERENCE PAPER

Arbabzadah EA, Shardlow PC, Damzen MJ, 2013, Laser pulse control of a Q-switched Nd: YVO4 bounce geometry laser using a secondary cavity

CONFERENCE PAPER

Damzen MJ, Shadlow PC, 2013, METHOD AND APPARATUS FOR LASER PULSE CONTROL, WO/2013/017338

A method and apparatus for controlling the amplification of radiation in a laser gain are described. By using the controlling action of a secondary radiation path through the common gain element the gain, as seen by the primary radiation path, can be controlled or limited. In one particularly set of embodiments pertaining to laser pulse control of a laser cavity, a laser system is described that comprises first and second laser cavities each including a common laser gain medium. The first cavity incorporates a modulation element for variation of its cavity loss. A second cavity is employed that has a substantially distinct path or separable cavity mode from that of the first cavity. The laser threshold of the second cavity is set to a value intermediate to the extremes of the threshold for the first cavity, corresponding to the maximum and minimum loss available to the modulation element. As a result a more flexible control of laser pulsing and laser performance control is provided. Other embodiments of this invention allow improvement of laser performance through the control of the amplification of the output of a laser system through an external laser amplifier by utilising a secondary radiation path through the external amplifier.

PATENT

Damzen MJ, Thomas GM, Minassian A, 2013, Multi-Watt Diode-Pumped Alexandrite Laser Operation, Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Publisher: IEEE

CONFERENCE PAPER

Damzen MJ, Thomas GM, Minassian A, 2013, Multi-watt diode-pumped alexandrite laser operation

CONFERENCE PAPER

Shardlow PC, Damzen MJ, 2013, Phase-conjugate self-organized coherent beam combination, Coherent Laser Beam Combining, Pages: 427-453, ISBN: 9783527652778

© 2013 Wiley-VCH Verlag GmbH & Co. KGaA. All rights reserved. Self-organized coherent beam combination (SOCBC) is a well-established technique for passive combination of multiple laser oscillators. This chapter provides a general overview of phase conjugation before introducing gain holography and how it can be experimentally used to generate a self-starting laser resonator that does not have predefined cavity modes. How these laser resonators can then be integrated into a PCSOCBC system is then discussed along with experimental verification. Next, the chapter deals with the power scaling opportunities of a PCSOCBC system. It focuses on the use of gain grating interactions as they offer simple and high-efficiency beam coupling, as all the interaction and amplification are contained within a single element. The chapter further talks about PCSOCBC utilizing, this laser amplifier geometry operation utilizing many other gain media where self-pumped phase conjugation has been demonstrated would be straightforward, such as in gas, solid-state, and dye systems among others.

BOOK CHAPTER

Teppitaksak A, Thomas GM, Damzen MJ, 2013, Versatile Pulsed Source using a pulsed diode seed and ultrahigh gain bounce geometry amplifier, Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Publisher: IEEE

CONFERENCE PAPER

Teppitaksak A, Thomas GM, Damzen MJ, 2013, Versatile pulsed source using a pulsed diode seed and ultrahigh gain bounce geometry amplifier

CONFERENCE PAPER

Thomas GM, Omatsu T, Damzen MJ, 2012, High-power neodymium-doped mixed vanadate bounce geometry laser, mode locked with nonlinear mirror, APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 108, Pages: 125-128, ISSN: 0946-2171

JOURNAL ARTICLE

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