Theoretical and experimental research on high-order stimulated Raman scattering in KGd(WO4)2

Wang, Xiaobin; Kang, Wenyun; Song, Xiaoquan; Xie, Ping; Zong, Nan; Tu, Wei

doi:10.1016/j.optcom.2016.09.056

Cited by 13 publications

(4 citation statements)

References 23 publications

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“…This model has been treated extensively, in various forms and derived using both classical and quantum mechanical formalisms. [15][16][17] The majority of numerical work concerning SRRS has used this model, or it's intensity based counterpart. However, given a particular setup, this model can be further reduced for simpler analyses.…”

Section: Methodsmentioning

confidence: 99%

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Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

McLaren

McCandless

Schrauth

et al. 2023

High Power Lasers for Fusion Research VII

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Stimulated rotational Raman scattering in air is a powerful parasitic process that degrades high intensity pulses propagated over significant distances. Through this inelastic scattering process, laser photons are converted to higher (Anti-Stokes) or lower (Stokes) energies, according to rotational mode transitions in the nitrogen and oxygen molecules. The full wave-mixing problem involves numerous frequencies including both Stokes and Anti-Stokes processes, multiple rotational line transitions, and multi-harmonic generation, with each generated field acting as a seed for subsequent scattering processes. Multiple numerical models of these processes were integrated into Lawrence Livermore National Laboratory's in-house nonlinear optical chain propagation software, Virtual Beamline++. The complex spatio-temporal dynamics of single, and multi-frequency stimulated rotational Raman scattering are highlighted and discussed. General limitations of steady-state, dynamic two-level, multi-harmonic, and multi-rotational models are demonstrated and compared.

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Section: Methodsmentioning

confidence: 99%

“…20 Therein, and for generalized models, we implicitly ignore far off-axis Raman generation which adds another level of complexity to the model, something which can be of relevance for picosecond pumped Raman lasers. 16,17 First, consider the number of photons in the system…”

Section: Methodsmentioning

confidence: 99%

Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

McLaren

McCandless

Schrauth

et al. 2023

High Power Lasers for Fusion Research VII

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“…Automatic phase-matching and beam quality improvement through Raman beam cleanup are fascinating features. With the emergence of excellent Raman crystals, such as YVO 4 [5,6], Ba (NO 3 ) 2 [7], BaWO 4 [8][9][10], KGd(WO 4 ) 2 [11][12][13][14], diamond , etc, all-solidstate Raman lasers have been attracting more and more attention because of their good mechanical and thermal properties, compactness and high conversion efficiency. Chemical vapor deposition (CVD) diamonds are an attractive Raman gain medium due to their excellent optical and thermal properties including the highest Raman shift (1332.3 cm −1 ), a very wide transparency range (from 225 nm to 2.5 µm and longer than 6 µm), a high Raman gain coefficient (10-12 cm GW −1 @1064 nm), and exceptionally high thermal conductivity (2000 W m -1 K -1 ).…”

Section: Introductionmentioning

confidence: 99%

Efficient operation near the quantum limit in external cavity diamond Raman laser

et al. 2020

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We realize efficient operation of the first Stokes (1240.3 nm) and the second Stokes (1485.8 nm) in external cavity diamond Raman lasers (DRLs) through efficient cavity coupling management and study their output performance. Firstly, an output pulse energy of 0.26 mJ at the first Stokes is generated and the slope efficiency is 84.3%, which closely approaches the quantum limit of 85.8%. Secondly, an output pulse energy of 0.26 mJ at the first Stokes and 0.18 mJ at the second are generated simultaneously. The total Raman output pulse energy is 0.44 mJ with a slope efficiency of 73.0%. To our knowledge, this is the highest slope efficiency in dual-wavelength external cavity DRLs. At the maximum pump level, by managing the cavity coupling, the energy ratio of the second Stokes to the first can be changed from 0.69 to 1.92. Highly efficient operation in external cavity DRLs is very important in practical applications, such as remote sensing, scanning lidar and laser range finding.

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“…SRS has been applied to the frequency conversion of gas, liquids, and solids-in particular, solid-state Raman media with characteristics of high ion density, large gain coefficient, wide frequency shift range, and large thermal conduction coefficient [17]. A multiorder Stokes laser can be achieved by SRS process when the pumping laser intensity is high enough [18,19]. Previously, numerous solid-state Raman mediums have been developed, including CVD diamond [20][21][22], YVO 4 crystal [23,24], Ba(NO 3 ) 2 crystal [25][26][27], and KGd(WO 4 ) 2 (KGW) crystal [28].…”

Section: Introductionmentioning

confidence: 99%

Discretely Tunable Multiwavelength Visible Laser Based on Cascaded Frequency Conversion Processes

Chen

Peng

et al. 2020

Applied Sciences

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We demonstrate a discretely tunable multiwavelength visible laser through second harmonic generation (SHG) and sum frequency generation (SFG) of multiorder Stokes lasers generated from an external Raman laser oscillator. The Raman laser oscillator, driven by a 1064 nm laser with an energy of 120 mJ, is based on a cascade of Ba(NO3)2 and two axial orthogonal KGd(WO4)2 crystals. Through adjusting the angle of the SHG/SFG crystal, we obtain 16 visible wavelengths with a wide range from 579.5–658.4 nm. In addition, we investigate the output energy and conversion efficiency of the resulting laser with various phase-matching angles. We show that the maximum energy of the visible laser is 8.87 mJ with five wavelengths, and the corresponding total conversion efficiency is 7.4%. These experimental results demonstrate a practical and effective method of generating a discretely tunable multiwavelength visible laser.

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Theoretical and experimental research on high-order stimulated Raman scattering in KGd(WO4)2

Cited by 13 publications

References 23 publications

Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

Efficient operation near the quantum limit in external cavity diamond Raman laser

Discretely Tunable Multiwavelength Visible Laser Based on Cascaded Frequency Conversion Processes

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