High-repetition-rate, intracavity-pumped KTP OPO at 1572 nm

Żendzian, Waldemar; Jabczyński, Jan Karol; Wachulak, P.; Kwiatkowski, Jacek

doi:10.1007/s00340-004-1717-x

Cited by 43 publications

(25 citation statements)

References 9 publications

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“…The studies, carried out for many years at the Military University of Technology, in the area of lasers: theory and technology; diagnostic laser measurements; modulation methods and impact of lase radiation on matter, have allowed to implement many developments including laser range finders, shooting simulators and fire control systems [2][3][4][5][6]. It was also possible to develop the entire family of laser radiation sources with different spectral, energy and time characteristics.…”

Section: Military Applications Of Lasersmentioning

confidence: 99%

Lasers in the dual use technologies

Mierczyk¹

2012

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. In the more developed countries the use of modern technologies in the national economy is a general process allowing joint funding of a security research and development by both sources, state and private. The last one is especially involved in applications of modern technologies. One of the examples of important modern technologies being under development in many countries are dual-use technologies, which include IT technologies, sensors, effective energy sources, material science, nanotechnology, micro-and nano-electronics, photonics, biotechnology and quantum medicine.In this paper chosen technologies fulfilling the needs of the military technique and security monitoring systems, which have found their applications in the different branches of industry like power engineering, transportation, construction industry, metrology, protection of environment and the medicine, are discussed. The examples include the devices and lasers systems for different threats monitoring, which have been developed at the Military University of Technology. The research studies carried out on the analysis of various materials based on their spectroscopic characteristics: absorption, emission, dispersion, polarization and fluorescence in different mediums have led to the development of laser telemetry devices, environment monitoring devices and spatial imagery, as well as devices for medical diagnostics and therapy. Mentioned systems are composed of functional modules, which were developed to meet the real needs. These systems can be expanded further by addition of extra detectors of chemical materials and physical properties, and improving measuring functions and data transmission and processing.

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Section: Military Applications Of Lasersmentioning

confidence: 99%

Lasers in the dual use technologies

Mierczyk¹

2012

Bulletin of the Polish Academy of Sciences: Technical Sciences

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“…During the past decades, various kinds of OPO operations have been investigated and it is shown that OPO technology can generate widely tunable coherent radiation [6][7][8]. As another efficient frequency conversion method, stimulated Raman scattering (SRS) has been already demonstrated and widely used for creating intense coherent radiation over the visible and near infrared [9][10][11].…”

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confidence: 99%

Theoretical and experimental studies on coexistent OPO and SRS from a KTiOPO4 pumped by an AO Q-switched Nd:LGGG laser

Qiao

Zhao

et al. 2016

Appl. Phys. B

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scattering (SRS), are common and propitious ways to obtain multi-wavelengths. During the past decades, various kinds of OPO operations have been investigated and it is shown that OPO technology can generate widely tunable coherent radiation [6][7][8]. As another efficient frequency conversion method, stimulated Raman scattering (SRS) has been already demonstrated and widely used for creating intense coherent radiation over the visible and near infrared [9][10][11]. In recent years, to pursue more convenient multiwavelength laser sources, the investigation by combining χ (2) and χ (3) for nonlinear frequency conversions in a same crystal has become a research hotspot. The related investigations show that the combination of χ (2) and χ (3) nonlinear frequency conversions can obtain multi-wavelengths efficiently [12][13][14][15][16][17]. As an excellent nonlinear crystal, KTi-OPO 4 (KTP) has the merits of good mechanical and optical properties, high damage threshold and possibility for noncritical phase matching. Moreover, the anisotropic Raman spectra, Raman gain coefficient and strongest Raman scattering of KTP about 2 cm/GW and 270 cm −1 have been reported [18,19]. Consequently, it has attracted a lot of attention in research field of frequency doubling, . However, up to now, the combination of OPO and SRS to obtain multi-wavelengths by using KTP as simultaneous multi-functional medium has rarely been reported. Recently, although simultaneous OPO and SRS processes from a single KTP pumped by a passively Q-switched laser were realized [24], there was no related theoretical analysis.As a derivative of Nd:Gd 3 Ga 5 O 12 (Nd:GGG) crystal, the isotropy disordered crystal Nd:LGGG has been considered as an excellent medium for the diode-pumped solid-state laser due to its good mechanical, thermal and optical properties. What is more, due to its inhomogeneous broadening absorption and emission bands [25], Nd:LGGG crystal may Abstract Coexistent intracavity KTiOPO 4 optical parametric oscillator (OPO) and stimulated Raman scattering (SRS) processes pumped by an acousto-optical Q-switched Nd:Lu x Gd 3−x Ga 5 O 12 (Nd:LGGG) laser were presented for the first time. The Stokes radiations at 1093.2/1125.8 nm and a signal wave of 1570 nm were generated. At an incident pump power of 9.25 W and pulse repetition rate of 3 kHz, the maximum output powers of 375 mW at 1570 nm and 98 mW at 1093.2/1125.8 nm were obtained for the signal wave and Stokes radiations, respectively, corresponding to a total conversion efficiency of 5.1 %. A set of coupled rate equations for coexistent OPO and SRS processes was developed, and the numerical solutions agreed with the experiment results.

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“…In this case, the most attractive approaches are optical parametric oscillators (OPOs) excited by solid-state lasers with diode pumping. Currently the average power of this type of OPO is 1.5-2.0 W for pulse duration 5 nsec and pulse repetition rate 40-80 kHz [3][4][5]. However, in order to use these emitters in modern ranging and detection systems, we need to improve the spatial characteristics of the beams they form.…”

mentioning

confidence: 99%

Intracavity parametric conversion of radiation from a pulsed Nd:YVO4 laser with high-power diode pumping

et al. 2006

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We have achieved intracavity parametric conversion of the radiation from a laser based on Nd:YVO 4 with high-power diode pumping. An LiF 2-crystal was used as the passive Q-switch for the Nd:YVO 4 laser. We have shown that by using an active element in the master laser with a passive region, we can form pulsed laser beams at a wavelength of 1.57 µm with peak power 3.2 kW and repetition rates up to 80 kHz, with beam quality parameter 1.4-1.8. Introduction.In recent years, the problem of designing high-efficiency compact laser radiation sources with output in an absolutely eye-safe spectral range (,1.5 µm) has attracted considerable attention from researchers [1]. One approach to solving this problem involves parametric conversion of laser radiation with a wavelength of 1.06 µm [2]. In this case, the most attractive approaches are optical parametric oscillators (OPOs) excited by solid-state lasers with diode pumping. Currently the average power of this type of OPO is 1.5-2.0 W for pulse duration 5 nsec and pulse repetition rate 40-80 kHz [3][4][5]. However, in order to use these emitters in modern ranging and detection systems, we need to improve the spatial characteristics of the beams they form.This work was devoted to study of the power, temporal, and spatial parameters of OPOs based on a solidstate Nd:YVO 4 laser with passive Q switching and high-power diode pumping. In order to obtain output radiation from the OPO with high beam quality, we propose using an active crystal in the master laser with an undoped (unactivated) region near one of its faces.The experiment. The layout for the intracavity OPO excited by a solid-state laser with longitudinal diode pumping is shown in Fig. 1. We used various yttrium orthovanadate crystals activated by neodymium ions as the laser-active element. In the experiments, we used Nd:YVO 4 elements with both a uniform and a nonuniform distribution of the activator over the volume. In the first case, the Nd concentration was 0.4 at.%, and the crystal was a parallelepiped of length 8 mm with transverse cross section 4 × 4 mm. In the second case, it was 10 mm long (8 mm of the length was in the region that was uniformly activated over the volume, 2 mm was in the passive section), transverse cross section 3 × 3 mm. The crystal was oriented in the cavity with the passive region facing the "opaque" mirror M1. The Nd ion concentration was as high as 0.5 at.%.On the ends of the Nd:YVO 4 crystals, coatings were applied that were transparent to the pump radiation wavelength (λ = 0.808 µm) and the oscillation wavelength (λ = 1.064 µm). The active element was attached to a

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High-repetition-rate, intracavity-pumped KTP OPO at 1572 nm

Cited by 43 publications

References 9 publications

Lasers in the dual use technologies

Lasers in the dual use technologies

Theoretical and experimental studies on coexistent OPO and SRS from a KTiOPO4 pumped by an AO Q-switched Nd:LGGG laser

Intracavity parametric conversion of radiation from a pulsed Nd:YVO4 laser with high-power diode pumping

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