Continuous-wave, single-pass, single-frequency second-harmonic-generation at 266 nm based on birefringent-multicrystal scheme

Devi, Kavita; Parsa, S.; Ebrahim-Zadeh, M.

doi:10.1364/oe.24.008763

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…7 Previous reports have demonstrated that this large π-conjugated group plays a crucial role for the large SHG response in famous β-BaB 2 O 4 (BBO) crystal 8,9 and also strong anisotropic birefringence in α-BaB 2 O 4 (α-BBO) 10 and Ba 2 M(B 3 O 6 ) 2 (M = Mg and Ca). 11,12 BBO crystals have been applied widely in the second harmonic generation (SHG) of the Nd-based laser, 13,14 as well as in the quantum-entangled photon pairs and microscale optical modulation. 15,16 The first-principles calculations were adopted to show that the contributions that the π-conjugated (B 3 O 6 ) 3− groups make to its SHG coefficient d 11 is more than 80%.…”

Section: Introductionmentioning

confidence: 99%

Revealing Electron–Phonon Coupling Dependence on the π-Conjugated Groups in Rare-Earth Borates

Wang

Liang

et al. 2022

Crystal Growth & Design

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Electron−phonon (e−ph) coupling, representing an interaction term connecting the electronic states and lattice vibrations, is an important hot topic in physical and chemistry frontiers. However, the e−ph coupling intensity dependence on the structural motifs is not well understood at present. Borate crystal containing conjugated πbonds is an important functional material for optical applications. Here, we investigated the relationship between the e−ph coupling intensity and the π-conjugated borate groups, including small π-conjugated (BO 3 ) 3− and large π-conjugated (B 3 O 6 ) 3− motifs. Compared with α-Ba 3 Gd(BO 3 ) 3 , the e-ph coupling intensity of Ba 3 Gd(B 3 O 6 ) 3 was greatly enhanced. The fitted Huang−Rhys factor of Ba 3 Gd(B 3 O 6 ) 3 was 3 times larger than that of α-Ba 3 Gd(BO 3 ) 3 , thus manifesting the strengthened phonon-assisted photon luminescence. Such substantial improvement could be attributed to the shortened B−O bond length and increased electron density on the conjugated (B 3 O 3 ) six-member ring. Our work not only provides a helpful guideline to search strong coupling in rare-earth materials but also paves new routes for π-conjugated functional materials with the e−ph coupling effect, for example, organic laser crystals and light-induced phase transitions.

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Section: Introductionmentioning

confidence: 99%

Revealing Electron–Phonon Coupling Dependence on the π-Conjugated Groups in Rare-Earth Borates

Wang

Liang

et al. 2022

Crystal Growth & Design

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“…On the other hand, there is an ever growing demand to cover this regime since many applications, including cooling and trapping of molecules with ultraviolet transitions [2], laser cooling of ions [3,4], optical clocks [5,6], and precision measurements [7], require high-power continuous-wave laser sources at short wavelengths. To mitigate this technological challenge, a typical approach starts with a high-power source at a longer wavelength that is then frequency-upconverted inside a crystal whose polarization depends non-linearly on the electric field to generate the desired light at the shorter wavelength [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Analytical approximation of the second-harmonic conversion efficiency

2020

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The second-harmonic generation process of a focused laser beam inside a nonlinear crystal is described by the Boyd-Kleinman theory. Calculating the actual conversion efficiency and upconverted power requires the solution of a double integral that is analytically intractable. We provide an expression that predicts the exact gain coefficient within an error margin of less than 2% over several orders of magnitude of the confocal parameter and as a function of the walk-off parameter. Our result allows for readily tuning the beam parameters to optimize the performance of the upconversion process and improve optical system designs.

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“…While this method makes use of enhanced optical fields, it leads to rather complex and bulky setups, with further complexity if active stabilization is required. These set-ups can be simplified by removing the external resonator, although this reduces the conversion efficiency, and so several passes through the same nonlinear stage are often used [7]. While it is possible to obtain high conversion efficiency with a single nonlinear crystal, a multi-crystal scheme has advantages in terms of reduced walk-off with improved beam quality.…”

Section: Introductionmentioning

confidence: 99%

Tunable, CW Laser Emission at 225 nm via Intracavity Frequency Tripling in a Semiconductor Disk Laser

Rodríguez-García

Pabouf

Hastie

2017

IEEE J. Select. Topics Quantum Electron.

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Numerous applications would benefit from a compact laser source with tunable, continuous-wave emission in the deep ultraviolet (wavelengths <250 nm); however, very few laser sources have been demonstrated with direct emission in this spectral region and options are generally limited to pulsed, fixed wavelength sources or complex and impractical setups for nonlinear frequency mixing of the emission of several infrared lasers in various external enhancement cavities. Here, we propose an all-solid-state, continuous-wave, tunable laser with emission between 224 and 226 nm via intracavity frequency tripling in an AlGaInP-based semiconductor disk laser (SDL). Output power up to 78 µW is achieved in continuous wave operation, with a tuning range over 350 cm −1 . AlGaInP-based SDLs may be designed to emit anywhere between ∼640-690 nm such that wavelengths between 213 and 230 nm may be targeted for specific applications using a similar set-up. An in-depth study of the nonlinear conversion has been carried out to understand the limitations of the set-up, namely large walk-off angles for phase-matching in the nonlinear crystals, and the potential for increasing the output power to several milli-Watts. This is, to the authors' knowledge, the first implementation of intracavity frequency tripling in a visible SDL and the shortest wavelength emitted from an SDL system.

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Continuous-wave, single-pass, single-frequency second-harmonic-generation at 266 nm based on birefringent-multicrystal scheme

Cited by 14 publications

References 27 publications

Revealing Electron–Phonon Coupling Dependence on the π-Conjugated Groups in Rare-Earth Borates

Revealing Electron–Phonon Coupling Dependence on the π-Conjugated Groups in Rare-Earth Borates

Analytical approximation of the second-harmonic conversion efficiency

Tunable, CW Laser Emission at 225 nm via Intracavity Frequency Tripling in a Semiconductor Disk Laser

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