Coherent beam combination laser system using SBS-PCM for high repetition rate solid-state lasers

Kong, Hong Jin; Park, Sangwoo; Cha, Seongwoo; Kalal, M.

doi:10.1016/j.optmat.2012.09.042

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…To the best of our knowledge, effective methods to create a plain wave-front include the use of an adaptive optics system [10], degenerated four-wave mixing (DFWM) [11], and a phase conjugate mirror (PCM) [12]. Among numerous media, liquid media are utilized for a high-energy and high-power laser, because it is insensitive to optical damage [13].…”

Section: Beam Combination and Stimulated Brillouin Scattering Phase Cmentioning

confidence: 99%

“…SBS can occur in gases, liquids, and in solid materials [14,15]. Among numerous media, liquid media are utilized for a high-energy and high-power laser, is insensitive to because it is insensitive to optical damage [13]. Specifically, fluorocarbon and perfluorinated carbon liquids have good phase-conjugation properties for a high-energy and highly repetitive laser [16,17].…”

Section: Beam Combination and Stimulated Brillouin Scattering Phase Cmentioning

confidence: 99%

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Current status of the development of the Kumgang laser

Kong¹,

Park²,

Cha³

et al. 2014

Opt. Mater. Express

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The Kumgang laser, a 4 kW (4 x 0.1 J @ 10 kHz / 8.5 ns) coherent beam combination laser using self-controlled stimulated Brillouin scattering phase conjugation mirrors (SBS-PCMs), is being developed. The front-end (FE) and the pre-amplifier (PA) are completed. The FE produces pulse energy of 0.51mJ and a pulse width of 8.5 ns with a 10 kHz repetition rate (0.51mJ @ 10 kHz / 8.5 ns) and a 95 MHz linewidth. The PA amplifies up to 200 W (20 mJ @ 10 kHz / 8.5 ns) with an input power 5.1 W.

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Section: Beam Combination and Stimulated Brillouin Scattering Phase Cmentioning

confidence: 99%

Section: Beam Combination and Stimulated Brillouin Scattering Phase Cmentioning

confidence: 99%

Current status of the development of the Kumgang laser

Kong¹,

Park²,

Cha³

et al. 2014

Opt. Mater. Express

Self Cite

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“…Methods such as rotating wedge plates and circulating media have been suggested to address these issues [38][39][40][41] . However, these approaches offered limited compensation and, in some cases, introduced new errors such as spherical aberration, adding complexity to the optical setup.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and suppression of beam distortion in a high repetition rate nanosecond stimulated Brillouin scattering phase conjugation mirror

Chen,

Tan,

Jin

et al. 2024

High Pow Laser Sci Eng

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The stimulated Brillouin scattering phase conjugation mirror (SBS-PCM) based on liquid media is widely used in highpower laser systems due to its robust thermal load capacity, high energy conversion efficiency and improved beam quality. Nevertheless, with an increase in the pump repetition rate, thermally-induced blooming and optical breakdown can emerge, leading to distortions in the Stokes beam. In this study, we delved into the thermal effects in liquid SBS-PCMs employing hydrodynamic analysis, establishing a relationship between beam profile distortion and the thermal convection field. We calculated the temperature and convection velocity distribution based on the pump light parameters and recorded the corresponding beam profiles. The intensities of the beam profiles were modulated in alignment with the convection directions, reaching a velocity peak of 2.85 mm/s at a pump pulse repetition rate of 250 Hz. The residual sum of squares (RSS) was employed to quantify the extent of beam profile distortion relative to a Gaussian distribution. The RSS escalated to 7.8, in contrast to 0.7 of the pump light at a pump pulse repetition rate of 500 Hz. By suppressing thermal convection using a high-viscosity medium, we effectively mitigated beam distortion. The RSS was reduced to 0.7 at a pump pulse repetition rate of 500 Hz, coinciding with a twentyfold increase in viscosity, thereby enhancing the beam quality. By integrating hydrodynamic analysis, we elucidated and mitigated distortion with targeted solutions. Our research offers an interdisciplinary perspective on studying thermal effects and contributes to the application of SBS-PCMs in high-repetition-rate laser systems by unveiling the mechanism of photothermal effects.

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“…Coherent combination of ultra-short pulses is one of the most promising techniques for obtain ultra-high peak power pulses [5,6]. Many research groups have worked on coherent combination and there are a number of developments [7][8][9][10][11][12][13]. Because of the complexity of pulse laser systems and the uncontrollability of environmental factors in large-scale ultra-short pulse laser facilities [14,15], the synchronization error between pulses is one of the key factors in realizing the coherent combination of ultra-short pulses (picosecond or femtosecond pulses) [7,16,17] in multi-channel systems.…”

Section: Introductionmentioning

confidence: 99%

Method of synchronization measurement via spatial–spectral interference in coherent combination of multi-channel ultra-short pulses

Li¹,

Zuo²,

Zong-zhi³

et al. 2017

Laser Phys.

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Spatial-spectral interference fringes contain information on the time delay between pulses. By extracting the slope of the equiphase line in the spatial-spectral interference fringes, a large range and high-precision detection of the time delay is realized. Theoretical analysis is given. An experiment demonstrates the fundamental process for obtaining the time delay between two femtosecond pulses. In the current experiment the measurement range is from 0.4 fs to hundreds of fs. This method was first proposed for synchronization measurement of coherent combination of ultra-short pulses in a multi-channel system. The method can be applied at large scales in an ultra-short pulse laser facility.

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Coherent beam combination laser system using SBS-PCM for high repetition rate solid-state lasers

Cited by 4 publications

References 23 publications

Current status of the development of the Kumgang laser

Current status of the development of the Kumgang laser

Characteristics and suppression of beam distortion in a high repetition rate nanosecond stimulated Brillouin scattering phase conjugation mirror

Method of synchronization measurement via spatial–spectral interference in coherent combination of multi-channel ultra-short pulses

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