Publications
38 results found
Thomas GM, Minassian A, Damzen MJ, 2019, Directly diode-side-pumped alexandrite slab lasers in the bounce geometry and optical vortex generation
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Arbabzadah EA, Kerridge-Johns W, Thomas GM, et al., 2019, High efficiency TEM <inf>00</inf> diode end-pumped Alexandrite laser
Teppitaksak A, Thomas GM, Damzen MJ, 2019, Gain-switched diode laser seeding of ultra-high-gain Nd: YVO <inf>4</inf> bounce amplifier system as a versatile pulsed laser source
Thomas G, Minassian A, Damzen MJ, 2018, Optical vortex generation from a diode-pumped alexandrite laser, Laser Physics Letters, Vol: 15, ISSN: 1612-2011
We present the demonstration of an optical vortex mode directly generated from a diode-pumped alexandrite slab laser, operating in the bounce geometry. This is the first demonstration of an optical vortex mode generated from an alexandrite laser or from any other vibronic laser. An output power of 2 W for a vortex mode with a 'topological charge' of 1 was achieved and the laser was made to oscillate with both left- and right-handed vorticity. The laser operated at two distinct wavelengths simultaneously, 755 and 759 nm, due to birefringent filtering in the alexandrite gain medium. The result offers the prospect of broadly wavelength tunable vortex generation directly from a laser.
Parali U, Sheng X, Minassian A, et al., 2017, Diode-pumped Alexandrite laser with passive SESAM Q-switching and wavelength tunability, Optics Communications, Vol: 410, Pages: 970-976, ISSN: 0030-4018
We report the first experimental demonstration of a wavelength tunable passively Q-switched red-diode-endpumped Alexandrite laser using a semiconductor saturable absorber mirror (SESAM). We present the results ofthe study of passive SESAM Q-switching and wavelength-tuning in continuous diode-pumped Alexandritelasers in both linear cavity and X-cavity configurations. In the linear cavity configuration, pulsed operation upto 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 wasbetween 740 nm and 755 nm. In the X-cavity configuration, a higher average power up to 73 mW, and obtainedwith higher pulse energy 6.5 J at 11.2 kHz repetition rate, in fundamental TEM00 mode with excellent spatialquality M2 < 1.1. The Q-switched wavelength tuning band spanned was between 775 nm and 781 nm.
Thomas GM, Minassian A, Kerridge-Johns W, et al., 2017, High power and high energy diode-pumped Alexandrite lasers, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
Coney AT, Thomas GM, Minassian A, et al., 2017, High-Energy Diode-Pumped Alexandrite Laser Development for Remote Sensing, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
Sheng X, Parali U, Thomas GM, et al., 2017, Passively SESAM Q-switched Red-Diode-Pumped Alexandrite Laser, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
Damzen MJ, Thomas GM, Minassian A, 2017, Diode-side-pumped Alexandrite slab lasers, Optics Express, Vol: 25, Pages: 11622-11636, ISSN: 1094-4087
We present the investigation of diode-side-pumping of Alexandrite slab lasers in a range of designs using linear cavity and grazing-incidence bounce cavity configurations. An Alexandrite slab laser cavity with double-pass side pumping produces 23.4 mJ free-running energy at 100 Hz rate with slope efficiency ~40% with respect to absorbed pump energy. In a slab laser with single-bounce geometry output power of 12.2 W is produced, and in a double-bounce configuration 6.5 W multimode and 4.5 W output in TEM00 mode is produced. These first results of slab laser and amplifier designs in this paper highlight some of the potential strategies for power and energy scaling of Alexandrite using diode-side-pumped Alexandrite slab architectures with future availability of higher power red diode pumping.
Parali U, Thomas GM, Minassian A, et 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)
Thomas GM, Minassian A, Sheng X, et 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
We present the first study of Q-switched Alexandrite lasers under continuous-wave diode-pumping with operation up to 10 kHz repetition rates in TEM00, with spatial quality M2 1.15. With a pulsed-diode dual-end-pumped design, pulse energy is scaled to a record level of 3 mJ. We also demonstrate, for the first time, cavity-dumped Q-switching of diode-pumped Alexandrite lasers under continuous-wave and pulsed diode-pumping, up to 10 kHz. Pulse energy of 510 μJ is demonstrated with 3 ns pulse duration and 170 kW peak power, in TEM00 with M2 < 1.2. Second harmonic generation of the cavity-dumped Q-switched pulses was used to generate UV wavelength 379 nm with conversion efficiency of 47 %.
Thomas GM, Minassian A, Teppitaksak A, et al., 2015, High Energy Q-switching and Cavity Dumped Q-switching of a Diode-pumped Alexandrite Laser, Advanced Solid State Lasers
Thomas GM, Damzen MJ, 2015, Next generation space and airborne laser technology - plenary, SpaceLab 2015
Thomas GM, 2015, Next generation space and airborne laser technology - plenary, SpaceLab 2015
Damzen MJ, Thomas GM, Teppitaksak A, et al., 2015, Diode-Pumped Alexandrite Laser—a new prospect for Remote Sensing, 11th Conference on Lasers and Electro-Optics/Pacific Rim, Publisher: 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.
Teppitaksak A, Thomas GM, Damzen MJ, 2015, Gain-switched diode laser seeding of ultra-high-gain Nd: YVO 4 bounce amplifier system as a versatile pulsed laser source, The European Conference on Lasers and Electro-Optics, Publisher: OSA Publishing
Thomas GM, Minassian A, Damzen MJ, 2015, Directly diode-side-pumped Alexandrite slab lasers in the bounce geometry and optical vortex generation, The European Conference on Lasers and Electro-Optics
Arbabzadah E, Kerridge-Johns W, Thomas GM, et al., 2015, High efficiency TEM00 diode end-pumped Alexandrite laser, The European Conference on Lasers and Electro-Optics
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
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- Citations: 6
Arbabzadah EA, Kerridge-Johns W, Thomas GM, et al., 2015, High efficiency TEM<inf>00</inf> diode end-pumped Alexandrite laser
Thomas GM, Teppitaksak A, Minassian A, et al., 2014, Progress in diode-pumped Alexandrite lasers as a new resource for future space Lidar missions, International Conference on Space Optics
Arbabzadah EA, Kerridge-Johns W, Thomas GM, et al., 2014, High efficiency TEM<inf>00</inf> diode end-pumped alexandrite laser
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
Thomas GM, Minassian A, Damzen MJ, 2014, Directly diode-side-pumped Alexandrite slab lasers in the bounce geometry and optical vortex generation
Teppitaksak A, Minassian A, Thomas GM, et al., 2014, High efficiency > 26 W diode end-pumped Alexandrite laser, Optics Express, Vol: 22, Pages: 16386-16392, ISSN: 1094-4087
We show for the first time that multi-ten Watt operation of an Alexandrite laser can be achieved with direct red diode-pumping and with high efficiency. An investigation of diode end-pumped Alexandrite rod lasers demonstrates continuous-wave output power in excess of 26W, more than an order of magnitude higher than previous diode end-pumping systems, and slope efficiency 49%, the highest reported for a diode-pumped Alexandrite laser. Wavelength tuning from 730 to 792nm is demonstrated using self-seeding feedback from an external grating. Q-switched laser operation based on polarization-switching to a lower gain axis of Alexandrite has produced ~mJ-pulse energy at 1kHz pulse rate in fundamental TEM00 mode.
Teppitaksak A, Thomas GM, Damzen MJ, 2013, Versatile pulsed source using a pulsed diode seed and ultrahigh gain bounce geometry amplifier
Damzen MJ, Thomas GM, Minassian A, 2013, Multi-watt diode-pumped alexandrite laser operation
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
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
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
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- Citations: 9
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