High-power DUV picosecond pulse laser with a gain-switched-LD-seeded MOPA and large CLBO crystal

Kohno, Kenta; Orii, Yosuke; Sawada, Hisashi; Okuyama, Daisuke; Shibuya, Kimihiko; Shimizu, Seiji; Yoshimura, Masashi; Mori, Yusuke; Nishimae, Junichi; Okada, George

doi:10.1364/ol.389017

Cited by 23 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We start with the thermal fluorescence spectra as a basis for our PPCP laser. In experiments, we choose a widely used laser crystal Nd:YVO4 with highly efficient radiation transition of 4f electrons in active Nd 3+ ions [26][27][28] . As shown in Fig.…”

Section: Electron-phonon Coupling In Fluorescencementioning

confidence: 99%

Photon-phonon collaboratively pumped laser

Chen

Liang

et al. 2023

Preprint

View full text Add to dashboard Cite

In 1916, Einstein considered stimulated photon emission of electron radiation, offering the theoretical foundation for laser1, technically achieved in 19602. To date, the laser has been emerging as cutting-edge modern technology from fundamental research to daily life3-8. However, the byproduct thermal phonons, along with heat creation of ineluctable non-radiative transition, is ineffective, even playing a detrimental role in lasing process. Despite the powerful ability of phonons, e.g., Raman process9,10 or Cooper pairs in superconductors11,12, it seems impractical to use random thermal phonons to help a highly coherent laser generation far beyond the inherent fluorescence spectra. Here, we realize a photon-phonon collaboratively pumped laser enhanced by heat in a counterintuitive way. We observe a clear laser transition from phonon-free 1064 nm lasing to phonon-pumped 1176 nm lasing in Nd:YVO4 crystals, associated with the phonon-pumped electron population inversion under gradually increasing temperature. Moreover, an additional temperature threshold (Tth) appears as the trigger besides ordinary photon pump power threshold (Pth). A two-dimensional lasing phase diagram of parameter space is revealed and experimentally verified with a general threshold curve ruled by Pth = C/Tth (constant C upon loss for a given crystal), similar to Curie’s Law13. We anticipate our strategy will promote the study of laser physics via dimension extending, searching for ultrahigh-efficiency and low-threshold yet tunable and compact laser devices via this new temperature degree of freedom.

show abstract

Section: Electron-phonon Coupling In Fluorescencementioning

confidence: 99%

Photon-phonon collaboratively pumped laser

Chen

Liang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Although CLBO may be the best nonlinear crystal for high-power DUV laser generation in terms of the trade-off between high power and good beam quality, the hygroscopic deterioration necessitates the CLBO crystal to be housed in a dry clean air environment and heated to more than 150°C, which adds to the complexity. 22,23 It is still cost-prohibitive, especially for large-dimension crystal (e.g., 100 mm × 100 mm × 100 mm), hindering the development of affordable, high-power 193-nm laser systems. 24 Power scaling up while maintaining cost-effectiveness is yet a challenge for 193-nm laser using CLBO.…”

Section: Introductionmentioning

confidence: 99%

“…The wide phase-matching (PM) range enables various sum frequency generation (SFG) of type-I and type-II phase matching in CLBO crystals. Although CLBO may be the best nonlinear crystal for high-power DUV laser generation in terms of the trade-off between high power and good beam quality, the hygroscopic deterioration necessitates the CLBO crystal to be housed in a dry clean air environment and heated to more than 150°C, which adds to the complexity 22 , 23 . It is still cost-prohibitive, especially for large-dimension crystal (e.g., 100 mm×100 mm×100 mm), hindering the development of affordable, high-power 193-nm laser systems 24 .…”

Section: Introductionmentioning

confidence: 99%

High-power, narrow linewidth solid-state deep ultraviolet laser generation at 193 nm by frequency mixing in LBO crystals

Zhang,

Yu,

Chen

et al. 2024

Adv. Photon. Nexus

View full text Add to dashboard Cite

A 60-mW solid-state deep ultraviolet (DUV) laser at 193 nm with narrow linewidth is obtained with two stages of sum frequency generation in LBO crystals. The pump lasers, at 258 and 1553 nm, are derived from a homemade Yb-hybrid laser employing fourth-harmonic generation and Er-doped fiber laser, respectively. The Yb-hybrid laser, finally, is power scaling by a 2 mm × 2 mm × 30 mm Yb:YAG bulk crystal. Accompanied by the generated 220-mW DUV laser at 221 nm, the 193-nm laser delivers an average power of 60 mW with a pulse duration of 4.6 ns, a repetition rate of 6 kHz, and a linewidth of ∼640 MHz. To the best of our knowledge, this is the highest power of 193-and 221-nm laser generated by an LBO crystal ever reported as well as the narrowest linewidth of 193-nm laser by it. Remarkably, the conversion efficiency reaches 27% for 221 to 193 nm and 3% for 258 to 193 nm, which are the highest efficiency values reported to date. We demonstrate the huge potential of LBO crystals for producing hundreds of milliwatt or even watt level 193-nm laser, which also paves a brand-new way to generate other DUV laser wavelengths.

show abstract

“…At present, ultrashort ultraviolet pulses mainly are generated by harmonic frequency conversion [6,7]. Nonlinear crystals, such as BBO, CLBO, KBBF [8], etc., have many advantages such as high nonlinear coefficient, high damage threshold, and large transmission range, and have gradually become the mainstream choice for obtaining deep UV light sources in commercial fields [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fourth harmonic generation characteristics of post-compressed ultrashort pulses

Zhihang

Li²,

Li³

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

View full text Add to dashboard Cite

Ultrafast ultraviolet UV lasers have significant applications in biological, industrial, and other fundamental research. For example, ultrafast laser with wavelength at 257 nm is the photon-injector driving source for next generation high repetition rate free-electron laser facilities. In this manuscript, we investigate the fourth harmonic generation of post-compressed IR pulses and suggest a high-performance sub-100 fs UV pulse generation method. Self-phase modulation plays a major role in spectral broadening in the post-compression, allowing the FHG to have a broader spectrum and achieve a shorter pulse duration, which will shrink the footprint of pulse stretching afterwards by a factor of 5. In this study, we employ a commercial laser as the fundamental source, which generates 50 μJ pulse energy, and 350 fs pulse duration at wavelength of 1030 nm. First, the pulse duration is compressed down to 66 fs after thin plate compression. Then we theoretically study the FHG after the nonlinear compression. The simulation shows, A UV pulse of 3.43 μJ, 118 fs was finally produced using two cascaded BBO crystals with thicknesses of 3 mm and 0.5 mm. As an alternative, a UV pulse lasting 1.37 μJ, 98 fs was produced using two BBO crystals with thicknesses of 3 mm and 0.2 mm. Additionally, we discovered that this approach does not result in a decrease in the FHG conversion efficiency compared with the un-compressed pulse.

show abstract

High-power DUV picosecond pulse laser with a gain-switched-LD-seeded MOPA and large CLBO crystal

Cited by 23 publications

References 20 publications

Photon-phonon collaboratively pumped laser

Photon-phonon collaboratively pumped laser

High-power, narrow linewidth solid-state deep ultraviolet laser generation at 193 nm by frequency mixing in LBO crystals

Fourth harmonic generation characteristics of post-compressed ultrashort pulses

Contact Info

Product

Resources

About