Ian Elder | Selex ES (original) (raw)
Papers by Ian Elder
Technologies for Optical Countermeasures V, 2008
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Technologies for Optical Countermeasures IX, 2012
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Technologies for Optical Countermeasures IX, 2012
ABSTRACT A simple scheme for efficient generation of two micron laser radiation is reported. Usin... more ABSTRACT A simple scheme for efficient generation of two micron laser radiation is reported. Using a thulium fibre laser to pump a Q-switched Ho:YAG laser 31.7 W of average output power is achieved with an M2 of 1.5 (an optical-to-optical conversion efficiency of 67% in terms of absorbed pump power) at a wavelength of 2.1 μm. A single-pass pump geometry is used, eliminating the risk of feedback of unabsorbed light into the fibre laser.
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Applied Optics, 1997
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Emerging Imaging and Sensing Technologies, 2016
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Laser-based Micro- and Nanoprocessing X, 2016
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Optics Communications, 1998
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Optics Communications, 1998
ABSTRACT A comparison of the room-temperature operation of diode-pumped continuous-wave thulium-d... more ABSTRACT A comparison of the room-temperature operation of diode-pumped continuous-wave thulium-doped YAP and YAG lasers is reported. A markedly superior conversion efficiency using 4.2% doped Tm:YAP was measured, 730 mW of laser output being generated with a 3 W pump diode, representing a 42% conversion of absorbed diode light to laser output. With 6% Tm:YAG, laser output was restricted to 270 mW, a 21% conversion efficiency. Both lasers were found to generate diffraction-limited output. Greater upconversion losses in YAG than YAP are proposed as a factor contributing to its poorer laser performance.
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Technologies for Optical Countermeasures IX, 2012
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Acquisition, Tracking, Pointing, and Laser Systems Technologies XXIII, 2009
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Technologies for Optical Countermeasures III, 2006
A laser diode end-pumped Q-switched Nd:YVO4 laser operating over a 25% to 100% duty cycle range h... more A laser diode end-pumped Q-switched Nd:YVO4 laser operating over a 25% to 100% duty cycle range has been built and characterised. A maximum average output power of 24.5 W has been achieved at an optical-to-optical conversion efficiency of 43%, with a beam quality factor M2 of 1.1.
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Electro-Optical and Infrared Systems: Technology and Applications IX, 2012
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Technologies for Optical Countermeasures VI, 2009
ABSTRACT Results are presented for generation of visible and mid-IR output using a common fibre-b... more ABSTRACT Results are presented for generation of visible and mid-IR output using a common fibre-based laser pump source. This source comprised a master oscillator power amplifier (MOPA) configuration incorporating a semiconductor seed source. Operation in the nanosecond and picosecond range is possible via use of the appropriate seed source. The MOPA is capable of generating 100 W average power in an output beam with an M2 of 1.1. Here the MOPA was operated in the nanosecond regime, using 100 ns seed pulses at a pulse repetition frequency of 100 kHz. 40 W each of pump power was available for a frequency doubling and an OPO stage. 9.8 W of green light was generated in an output beam with an M2 of 1.2; using a degenerate PPLN OPO 12.7 W of broadband mid-IR output, with a FWHM linewidth in excess of 170 nm, was generated.
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Laser Technology for Defense and Security V, 2009
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Advanced Solid State Lasers, 1995
Characterization of a CW Diode-Pumped Tm:YAlO, Laser IF Elder and MJP Payne Defence Research Agen... more Characterization of a CW Diode-Pumped Tm:YAlO, Laser IF Elder and MJP Payne Defence Research Agency, St. Andrews R oa Malvern, Worcs WR14 3PS. Unitéd Kingabm Abstract We report on a rmm temperature cw Tm:YA103 laser end-pumped by a single 3 W laser diode. ...
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Advanced Solid State Lasers, 1996
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Electronics Letters, 1998
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Applied Physics Letters, 2013
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Conversion efficiencies of 44% and 56% are demonstrated in single and double-pass pump geometries... more Conversion efficiencies of 44% and 56% are demonstrated in single and double-pass pump geometries respectively for a degenerate 1 micron pumped PPLN OPO. Pump feedback in the double-pass geometry acts as a pulse shortening mechanism.
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Technologies for Optical Countermeasures V, 2008
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Technologies for Optical Countermeasures IX, 2012
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Technologies for Optical Countermeasures IX, 2012
ABSTRACT A simple scheme for efficient generation of two micron laser radiation is reported. Usin... more ABSTRACT A simple scheme for efficient generation of two micron laser radiation is reported. Using a thulium fibre laser to pump a Q-switched Ho:YAG laser 31.7 W of average output power is achieved with an M2 of 1.5 (an optical-to-optical conversion efficiency of 67% in terms of absorbed pump power) at a wavelength of 2.1 μm. A single-pass pump geometry is used, eliminating the risk of feedback of unabsorbed light into the fibre laser.
Bookmarks Related papers MentionsView impact
Applied Optics, 1997
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Emerging Imaging and Sensing Technologies, 2016
Bookmarks Related papers MentionsView impact
Laser-based Micro- and Nanoprocessing X, 2016
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Optics Communications, 1998
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Optics Communications, 1998
ABSTRACT A comparison of the room-temperature operation of diode-pumped continuous-wave thulium-d... more ABSTRACT A comparison of the room-temperature operation of diode-pumped continuous-wave thulium-doped YAP and YAG lasers is reported. A markedly superior conversion efficiency using 4.2% doped Tm:YAP was measured, 730 mW of laser output being generated with a 3 W pump diode, representing a 42% conversion of absorbed diode light to laser output. With 6% Tm:YAG, laser output was restricted to 270 mW, a 21% conversion efficiency. Both lasers were found to generate diffraction-limited output. Greater upconversion losses in YAG than YAP are proposed as a factor contributing to its poorer laser performance.
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Technologies for Optical Countermeasures IX, 2012
Bookmarks Related papers MentionsView impact
Acquisition, Tracking, Pointing, and Laser Systems Technologies XXIII, 2009
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Technologies for Optical Countermeasures III, 2006
A laser diode end-pumped Q-switched Nd:YVO4 laser operating over a 25% to 100% duty cycle range h... more A laser diode end-pumped Q-switched Nd:YVO4 laser operating over a 25% to 100% duty cycle range has been built and characterised. A maximum average output power of 24.5 W has been achieved at an optical-to-optical conversion efficiency of 43%, with a beam quality factor M2 of 1.1.
Bookmarks Related papers MentionsView impact
Electro-Optical and Infrared Systems: Technology and Applications IX, 2012
Bookmarks Related papers MentionsView impact
Technologies for Optical Countermeasures VI, 2009
ABSTRACT Results are presented for generation of visible and mid-IR output using a common fibre-b... more ABSTRACT Results are presented for generation of visible and mid-IR output using a common fibre-based laser pump source. This source comprised a master oscillator power amplifier (MOPA) configuration incorporating a semiconductor seed source. Operation in the nanosecond and picosecond range is possible via use of the appropriate seed source. The MOPA is capable of generating 100 W average power in an output beam with an M2 of 1.1. Here the MOPA was operated in the nanosecond regime, using 100 ns seed pulses at a pulse repetition frequency of 100 kHz. 40 W each of pump power was available for a frequency doubling and an OPO stage. 9.8 W of green light was generated in an output beam with an M2 of 1.2; using a degenerate PPLN OPO 12.7 W of broadband mid-IR output, with a FWHM linewidth in excess of 170 nm, was generated.
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Laser Technology for Defense and Security V, 2009
Bookmarks Related papers MentionsView impact
Advanced Solid State Lasers, 1995
Characterization of a CW Diode-Pumped Tm:YAlO, Laser IF Elder and MJP Payne Defence Research Agen... more Characterization of a CW Diode-Pumped Tm:YAlO, Laser IF Elder and MJP Payne Defence Research Agency, St. Andrews R oa Malvern, Worcs WR14 3PS. Unitéd Kingabm Abstract We report on a rmm temperature cw Tm:YA103 laser end-pumped by a single 3 W laser diode. ...
Bookmarks Related papers MentionsView impact
Advanced Solid State Lasers, 1996
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Electronics Letters, 1998
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Applied Physics Letters, 2013
Bookmarks Related papers MentionsView impact
Conversion efficiencies of 44% and 56% are demonstrated in single and double-pass pump geometries... more Conversion efficiencies of 44% and 56% are demonstrated in single and double-pass pump geometries respectively for a degenerate 1 micron pumped PPLN OPO. Pump feedback in the double-pass geometry acts as a pulse shortening mechanism.
Bookmarks Related papers MentionsView impact