Publications
363 results found
Syed KS, Crofts GJ, Damzen MJ, 1997, Transient modeling of a self-starting holographic laser oscillator, ISSN: 1092-8081
The dynamics and output characteristics of a self-starting holographic laser oscillator (HLO) were studied numerically by comparing one-, two-, and four-grating models. The models include propagation effects of the amplifiers and the buildup phase leading to lasing threshold. Temporal output from an HLO from a single grating was compared with HLO operating on four gratings and showed that multiple gratings reach lasing threshold quicker than one grating and lases with a higher energy.
CamachoLopez S, Green RPM, Crofts GJ, et al., 1997, Intensity-induced birefringence in Cr4+:YAG, JOURNAL OF MODERN OPTICS, Vol: 44, Pages: 209-219, ISSN: 0950-0340
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- Citations: 24
Green RPM, Udaiyan D, Crofts GJ, et al., 1996, Holographic laser oscillator which adaptively corrects for polarization and phase distortions, PHYSICAL REVIEW LETTERS, Vol: 77, Pages: 3533-3536, ISSN: 0031-9007
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- Citations: 18
Barrientos B, Aboites V, Damzen M, 1996, Temporal dynamics of a ring dye laser with a stimulated Brillouin scattering mirror, Applied Optics, Vol: 35, Pages: 5386-5391, ISSN: 1559-128X
We present a numerical study of the temporal dynamics of a stimulated Brillouin scattering ring resonator. A coaxial flash-lamp-pumped Rh6G dye laser is assumed. The influence of the most important parameters on the temporal evolution of the resonator is analyzed, namely, the acoustic decay time of the nonlinear material, the features of the external injection pulse—its pulse width, energy, and spatial quality—and the coupling mirror reflectivity. We found the conditions to initiate and maintain laser oscillation in the ring resonator as long as the duration of the pumping system pulse persisted. © 1996 Optical Society of America.
Syed KS, Crofts GJ, Damzen MJ, 1996, Transient analysis of four-grating copolarized four-wave mixing in saturable gain media with finite probe, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 13, Pages: 1892-1904, ISSN: 0740-3224
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- Citations: 13
Green RPM, CamachoLopez S, Damzen MJ, 1996, Experimental investigation of vector phase conjugation in Nd3+:YAG, OPTICS LETTERS, Vol: 21, Pages: 1214-1216, ISSN: 0146-9592
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- Citations: 10
Udaiyan D, Green RPM, Kim DH, et al., 1996, Double-pumped phase conjugation in inverted Nd:YAG, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 13, Pages: 1766-1771, ISSN: 0740-3224
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- Citations: 3
Lamb RA, Damzen MJ, 1996, Phase locking of multiple stimulated Brillouin scattering by a phase-conjugate laser resonator, JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 13, Pages: 1468-1472, ISSN: 0740-3224
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- Citations: 5
Kaczmarek M, Ross GW, Eason RW, et al., 1996, Intensity-dependent absorption and its modelling in infrared sensitive rhodium-doped BaTiO3, OPTICS COMMUNICATIONS, Vol: 126, Pages: 175-184, ISSN: 0030-4018
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- Citations: 16
Damzen MJ, CamachoLopez S, Green RPM, 1996, Wave-mixing and vector phase conjugation by polarization-dependent saturable absorption in Cr4+:YAG, PHYSICAL REVIEW LETTERS, Vol: 76, Pages: 2894-2897, ISSN: 0031-9007
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- Citations: 19
Green RPM, Crofts GJ, Damzen MJ, 1996, Novel method for double phase conjugation in gain media, OPTICS COMMUNICATIONS, Vol: 124, Pages: 488-492, ISSN: 0030-4018
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- Citations: 2
Green RPM, Crofts GJ, Hubbard W, et al., 1996, Dynamic laser control using feedback from a gain grating, IEEE JOURNAL OF QUANTUM ELECTRONICS, Vol: 32, Pages: 371-377, ISSN: 0018-9197
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- Citations: 7
Damzen MJ, Matsumoto Y, Crofts GJ, et al., 1996, Bragg-selectivity of a volume gain grating, OPTICS COMMUNICATIONS, Vol: 123, Pages: 182-188, ISSN: 0030-4018
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- Citations: 18
Minassian A, Crofts GJ, Damzen MJ, 1996, Tunable narrowband holographic Ti:sapphire laser
This paper presents for the first time an experimental implementation of a holographic resonator using laser-pumped Ti:S as the gain material and discusses the characteristics of the resulting laser radiation. The loop contains two Brewster Ti:S rods which are longitudinally-pumped with Q-switched pulses from a frequency-doubled (532nm) Nd:YAG laser system. One crystal acted as the holographic gain crystal while second rod provided additional amplification. The operation of the system is optimized by the use of a non-reciprocal transmission device. The output coupler was provided by either a partial reflector or a grating in the Littrow configuration for wavelength tuning. TEM00 and narrow linewidth operations are demonstrated, including SLM performance.
Green RPM, Camacho-Lopez S, Udaiyan D, et al., 1996, Vector phase conjugation and its implementation in holographic laser resonators, Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, ISSN: 1092-8081
Vector phase conjugation (VPC) allows correction for depolarization and wavefront reversal to be achieved in a single nonlinear interaction. In this work, the VPC is demonstrated both in saturable absorber and a gain material for the first time. Results are presented showing that FWM is both materials can compensate for large polarization aberrations.
Green RPM, Syed KS, Camacho-Lopez S, et al., 1996, Vector phase conjugation in saturable media
This paper presents experimental results of the phase conjugate reflectivity and fidelity of Vectorial phase conjugation VPC in saturable media. The saturable media is either a flashlamp pumped Nd:YAG rod producing a small signal gain of G0approx.70 or a Cr4+:YAG crystal with a small-signal transmission of T0=0.42. The pump beams and probe beam were supplied by a 10Hz Q-switched Nd:YAG (1064nm) laser system producing a single longitudinal mode (SLM) pulse (16ns FWHM) in a TEM00 spatial mode. The counter-propagating pump beams had orthogonal circularly polarisations so as to achieve the condition necessary for VPC and were also made equal in intensity. Using the experimental arrangement described the authors assessed the VPC fidelity of the DFWM interaction by monitoring the relative p and s conjugate components.
Udaiyan D, Green RPM, Kim DH, et al., 1996, Experimental and theoretical double-pumped phase conjugation in inverted Nd:YAG, Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, Pages: 507-508, ISSN: 1092-8081
Double-pumped phase conjugation (DPPC) has been studied in photorefractive, and in media with local response. In this work, an attempt is made to demonstrate experimentally DPPC in a gain medium (Nd:YAG) and show that it can produce high powers, high reflectivities, and fast response times compared to DPPC in photorefractives.
Crofts GJ, Minassian A, Damzen MJ, 1996, Self-starting holographic Ti:sapphire laser, Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, ISSN: 1092-8081
This report discusses the experimental implementation of a holographic resonator using laser-pumped Ti:S as the gain material and the characteristics of the resulting laser radiation. It is believed that this is the first time a tunable holographic laser resonator is implemented in Ti:S. Finally, the ways to optimize the energy and tunability of this system are presented.
Damzen MJ, 1996, Self-adaptive solid-state lasers using dynamic holographic mirror
Recent work is presented on 3-D saturable gain-gratings, optically-written by spatial hole-burning in the active lasing medium, as efficient self-adaptive diffractive optical elements for application in gain media phase conjugators and for adaptive spatial, spectral and Q-switching control of high-gain solid-state lasers. Description is made of gain-gratings written by spatial hole-burning when coherent beams, at the lasing wavelength, interfere in a gain medium. Such 3-D gain gratings, which have a persistence for the upper-state lifetime of the gain medium, can be considered as volume gain holograms and the application of these adaptive grating devices can be considered as a type of dynamic 'gain holography'.
Barrientos B, Aboites V, Damzen MJ, 1996, Temporal dynamics of a ring dye laser with a stimulated Brillouin scattering mirror, Pages: 67-75, ISSN: 0277-786X
We present a numerical study of the temporal dynamics of a stimulated-Brillouin-scattering ring resonator. A coaxial-flashlamp-pumped RH6g dye laser is assumed. The influence of the most important parameters on the temporal evolution of the resonator is analyzed, namely the acoustic decay time of the nonlinear material, the features of the external-injection pulse - its pulsewidth, energy, and spatial quality - and the coupling mirror reflectivity. The conditions to initiate and sustain laser oscillation in the ring resonator as long as the duration of the pumping-system pulse persists were found.
Green RPM, Camacho-Lopez S, Damzen MI, 1996, Pump-probe measurements of induced-absorption birefringence in Cr<sup>4+</sup>:YAG at 1.064 μm, Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, Pages: 283-284, ISSN: 1092-8081
This work presents detailed saturation measurements of sample of Cr YAG using pulses from a NdYAG laser at 1.064 μm wavelength. As well as measuring the saturable transmission as a function of the valence and polarization orientation of a saturating optical field, the transmission of a weak probe pulse whose polarization can be varied is also monitored. In these experiments pulse propagation of both the pump and probe is along the 100 axis and their polarization electric field vector E can be paralleled to the 011 or 001 axes or at some intermediate angle to these axes.
Ramos-Garcia R, Damzen MJ, 1996, Dark build-up of photorefractive gratings after nanosecond pulse recording in BaTiO<inf>3</inf> with two secondary trapping centres
This paper reports on the detailed observation of dark evolution of photorefractive gratings and induced absorption in BaTiO3 after illumination with a single 15 ns pulse from time scales of 500 μs to 50 s. The initial photorefractive grating written by the short pulse evolves into three distinct phases: (1) a fast growth component approx.50 ms, (2) slow growth component approx.2-3 sec, and finally, (3) a ultralong decay approx. 30 min. The long decay time (3) is associated with the thermal erasure of the deep trap grating. The two growth time scales (1) and (2) are explained with the presence of two secondary (shallow) centres. To characterise the properties of these two centres, a detailed comparison to theory is made by modelling numerically a charge transport model which includes electron-hole conductivity and a combined deep and two secondary photorefractive centres.
Hamoir D, Damzen MJ, Duffault L, et al., 1996, Multimode optical parametric oscillation modelling including back-conversion to 'pump' at side-frequencies, Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, ISSN: 1092-8081
A multimode one-dimensional model of nanosecond optical parametric oscillation (OPO) is proposed and applied to the modelling of an experimental doubly-resonant KTP OPO with double-passing of the pump. The generation of multimode signal and idler fields are accounted by adding relevant terms and equations to the set of coupled equations. The effect of an increase in the number of modes generated is shown. When several signal-idler pairs are created, modes from different pairs can cross interact, giving rise to back-conversion to 'pump' at frequencies other than that of the injected pump.
Mocofanescu A, Udaiyan D, Damzen MJ, et al., 1996, Nd:YAG laser with a ring resonator and a phase-cojugating mirror based on external stimulated Brillouin scattering, Conference on Phase Conjugation and Adaptive Optics - Laser Optics 95, Publisher: SPIE - INT SOC OPTICAL ENGINEERING, Pages: 28-33
Barrientos B, Aboites V, Damzen M, 1995, Temporal dynamics of an external-injection dye laser with a stimulated Brillouin scattering reflector, Journal of Optics, Vol: 26, Pages: 97-104, ISSN: 0150-536X
Temporal dynamics of an external-injection stimulated Brillouin scattering laser resonator has been numerically modelled. A flash-lamp-pumped Rh6G dye laser is assumed. The main parameters affecting its performance were numerically analysed in order to understand their influence on the temporal evolution of the laser. These parameters were: the acoustic decay time of the nonlinear material, the energy of the external-injection pulse (input pulse), the pulsewidth, the coupling mirror reflectivity, and the spatial quality of the incident pulse. It was found that in order to have laser oscillation in the resonator, the acoustic decay time must be in a well-defined range, the input pulse energy is to be greater than a minimum value, and the beam divergence must not be greater than a certain limit value.
DAMZEN MJ, BARRY NP, BUTTINGER M, 1995, HIGH-INTENSITY EFFECTS IN SELF-PUMPED PHOTOREFRACTIVE PHASE-CONJUGATION USING NANOSECOND PULSES, JOURNAL OF MODERN OPTICS, Vol: 42, Pages: 2051-2057, ISSN: 0950-0340
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- Citations: 9
Damzen MJ, Green RP, Syed KS, 1995, Self-adaptive solid-state laser oscillator formed by dynamic gain-grating holograms., Opt Lett, Vol: 20, ISSN: 0146-9592
DAMZEN MJ, GREEN RPM, SYED KS, 1995, SELF-ADAPTIVE SOLID-STATE LASER-OSCILLATOR FORMED BY DYNAMIC GAIN-GRATING HOLOGRAMS, OPTICS LETTERS, Vol: 20, Pages: 1704-1706, ISSN: 0146-9592
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- Citations: 118
Crofts GJ, Banti X, Damzen MJ, 1995, Tunable phase conjugation in a Ti:sapphire amplifier., Opt Lett, Vol: 20, Pages: 1634-1636, ISSN: 0146-9592
Four-wave mixing by gain saturation in a laser-pumped Ti:sapphire (Ti(3+):Al(2)O(3)) amplif ier is demonstrated for the f irst time to our knowledge. Small-signal gain in excess of 250 has been obtained by intense laser pumping at 532 nm, resulting in observed four-wave mixing energy ref lectivity as high as 360% for nanosecond pulses at 780 nm.
CROFTS GJ, BANTI X, DAMZEN MJ, 1995, TUNABLE PHASE-CONJUGATION IN A TI-SAPPHIRE AMPLIFIER, OPTICS LETTERS, Vol: 20, Pages: 1634-1636, ISSN: 0146-9592
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- Citations: 19
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