High repetition rate Q-switching of high power Nd:YVO4 slab laser

García-López, J. H.; Aboites, Vicente; Kir’yanov, Alexander V.; Damzen, M. J.; Minassian, A.

doi:10.1016/s0030-4018(03)01193-3

Cited by 50 publications

(10 citation statements)

References 16 publications

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“…Since in 1966, study on neodymium-glass laser system with cavityless configuration was reported [1], but limited to the media of low gain level in the past, the system was relatively complex and huge. In the past decades, many types of high gain solid-state lasers has developed rapidly, such as innoslab lasers [7][8][9], multi-pass laser amplifiers [10][11][12] and bounce geometry [13][14][15] lasers. These high gain laser modules make it possible to simplify the cavityless laser system.…”

Section: Introductionmentioning

confidence: 99%

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO₄bounce geometry

2019

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An AOQ (acoustic-optic Q-switched) laser with cavityless weak-feedback configuration is demonstrated based on a Nd:GdVO4 bounce geometry. The laser can operate at a repetition up to 500 kHz with the output power above 4W. The pulse-width at 100 kHz reaches 5.2 ns, which is 4.3 times the round-trip time. A theory of Q-switched cavityless weakfeedback laser is proposed for the first time, to our best knowledge. This theory is very suitable for analyzing short pulses comparable to round-trip time. By utilizing the theory, simulation is implemented for our experimental conditions. The consistence between the simulation and the experimental results proves the validity of our theory.

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Section: Introductionmentioning

confidence: 99%

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO₄bounce geometry

2019

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“…Acousto-optical modulators (AOMs) are commonly used to modulate laser power in intraand extra-cavity setups [1][2][3][4][5]. Regarding high-power solid-state lasers, AOMs are typically used to modulate the laser's fundamental wavelength prior to extra-cavity harmonic generation (HG), though AOMs for wavelengths ranging from UV to MID-IR are available in principle [6].…”

Section: Introductionmentioning

confidence: 99%

Analytic and experimental investigations on influence of harmonic generation on acousto-optical modulation

Bechtold¹,

Hentschel²,

Schmidt³

2012

Opt. Express

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In application, laser power is modulated prior to harmonic generation to a large part. Consequently modulation characteristics are influenced as a result of the non-linearity of harmonic generation. Within this paper, straight-forward approaches to calculate modulation key parameters (rise time, fall time, bandwidth and contrast ratio) of an acoustooptical modulator prior to harmonic generation stage are presented. The results will be compared to experimental data for third harmonic generation (THG) of a 1064 nm fs-laser which is power-modulated by a TeO 2 -AOM prior to THG. In the latter case, rise time and fall time are significantly reduced to approximately 66% after THG both in experimental and analytical study.

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“…To generate ultrahigh pulse rates requires Qswitched lasers with ultrahigh gain, but problems can arise if the modulation element is insufficient to prevent laser action or hold-off lasing at low repetition rates. In these cases, lasing output can occur when it is not desired [2]. In this work we present a novel method for pulse control in a high gain bounce amplifier Qswitched system by using a secondary cavity to clamp the gain and allow for clean single pulse operation from very high (800kHz) to very low (e.g.1kHz) repetition rates.…”

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confidence: 99%

Laser pulse control of a Q-switched Nd:YVO<inf>4</inf> bounce geometry laser using a secondary cavity

Arbabzadah

Shardlow

Damzen

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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Pulsed laser operation is desirable for a wide range of applications such as laser micromachining in industrial manufacturing and laser marking for product identification [1]. In these cases it is beneficial to have flexibility in the parameters of the laser pulse to suit the specific application. This can include the ability to achieve a wide range of pulse repetition rates, with some applications requiring variation of laser pulse rate from high rate (multi-kHz) to low rate or even an off-state in a fast timescale. To generate ultrahigh pulse rates requires Qswitched lasers with ultrahigh gain, but problems can arise if the modulation element is insufficient to prevent laser action or hold-off lasing at low repetition rates. In these cases, lasing output can occur when it is not desired [2]. In this work we present a novel method for pulse control in a high gain bounce amplifier Qswitched system by using a secondary cavity to clamp the gain and allow for clean single pulse operation from very high (800kHz) to very low (e.g.1kHz) repetition rates. A schematic of the experimental system is shown in Fig. 1(a). This set-up utilised the bounce geometry in which the laser mode takes a total internal reflection off the pump face of the laser crystal. The laser crystal was a 1.1at. % doped Nd:YVO 4 slab crystal with dimensions of 20mm x 5mm x 2mm. Side pumping was achieved via the 20mm x 2mm face using a 50W diode bar operating at 808nm. Two laser cavities, a primary cavity with output P1 and a secondary cavity with output P2, were formed using the same laser crystal. The path of the primary cavity mode (shown by the black line in Fig. 1(a)) includes an acousto-optic Q-switch (AO-QS) for pulsed operation. A secondary cavity, with a slightly larger internal bounce angle is shown in red and its threshold can be set by its cavity optics.With the secondary cavity blocked, 26W of Q-switched output at a repetition rate of 800kHz was achieved in TEM 00 mode at a pump power of 50W from the primary cavity. In this scheme it was not possible to achieve clean pulsed operation at repetition rates below ~100kHz as the Q-switch could not effectively hold off lasing. With the secondary cavity operating, the gain could be clamped at a level that the Q-switch was able to suppress. The effect of this is seen in Fig. 1(b) which shows the Q-switched pulse duration and output power (P1) from the primary cavity alongside the output power (P2) from the secondary cavity for repetition rates ranging from 1-800kHz at a pump power of 37W. At 800kHz, an output power of 15W was obtained from the primary cavity. Decreasing the repetition rate led to a decrease in P1 and a corresponding increase in P2. Although this suppression of the primary cavity resulted in lower average power and Q-switched pulse energy, it allowed clean single pulse operation to be achieved at all repetition rates shown. In addition, at repetition rates below 100kHz, the Q-switched pulse duration is almost constant at ~18ns due to the clamping of the gain. References[1] J.

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High repetition rate Q-switching of high power Nd:YVO4 slab laser

Cited by 50 publications

References 16 publications

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO₄bounce geometry

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO₄bounce geometry

Analytic and experimental investigations on influence of harmonic generation on acousto-optical modulation

Laser pulse control of a Q-switched Nd:YVO<inf>4</inf> bounce geometry laser using a secondary cavity

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High repetition rate Q-switching of high power Nd:YVO4 slab laser

Cited by 50 publications

References 16 publications

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO4bounce geometry

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO4bounce geometry

Analytic and experimental investigations on influence of harmonic generation on acousto-optical modulation

Laser pulse control of a Q-switched Nd:YVO<inf>4</inf> bounce geometry laser using a secondary cavity

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Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO₄bounce geometry

Acousto-optically Q-switched cavityless weak-feedback laser based on Nd:GdVO₄bounce geometry