Large brightness enhancement for quasi-continuous beams by diamond Raman laser conversion

Zhenxu Bai, Robert J. Williams, Hadiya Jasbeer, Soumya Sarang, Ondrej Kitzler, Aaron McKay, Richard P. Mildren

Research output: Contribution to journalArticleResearchpeer-review

Abstract

High average power lasers with high beam quality are critical for emerging applications in industry and research for defense, materials processing, and space applications. However, overcoming thermal effects in the gain medium remains the key challenge for increasing laser brightness at high powers. Here we report a means for increasing the beam brightness of high-power continuous-wave (CW) beams based on external cavity Raman lasers using diamond, a material with thermal properties far superior to any other laser material. With pump beam quality in the range M 2 = 2.3–7.3, efficient pump-limited conversion to an M 2 = 1.1 Stokes beam is achieved in all cases, with increases in brightness from the pump by factors as high as 12.7. The influence of pump beam quality on laser threshold and slope efficiency is analyzed. This Letter foreshadows an alternative approach for scaling the brightness of CW lasers using high-power, moderate beam quality pumps up to M 2 = 20 or more, such as thin-disk and slab lasers and fiber lasers operating in a mode instability regime.

LanguageEnglish
Pages563-566
Number of pages4
JournalOptics Letters
Volume43
Issue number3
DOIs
Publication statusPublished - 1 Feb 2018

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Raman lasers
brightness
diamonds
augmentation
pumps
lasers
laser materials
continuous wave lasers
continuous radiation
fiber lasers
temperature effects
emerging
slabs
thermodynamic properties
industries
slopes
scaling
cavities
thresholds

Cite this

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abstract = "High average power lasers with high beam quality are critical for emerging applications in industry and research for defense, materials processing, and space applications. However, overcoming thermal effects in the gain medium remains the key challenge for increasing laser brightness at high powers. Here we report a means for increasing the beam brightness of high-power continuous-wave (CW) beams based on external cavity Raman lasers using diamond, a material with thermal properties far superior to any other laser material. With pump beam quality in the range M 2 = 2.3–7.3, efficient pump-limited conversion to an M 2 = 1.1 Stokes beam is achieved in all cases, with increases in brightness from the pump by factors as high as 12.7. The influence of pump beam quality on laser threshold and slope efficiency is analyzed. This Letter foreshadows an alternative approach for scaling the brightness of CW lasers using high-power, moderate beam quality pumps up to M 2 = 20 or more, such as thin-disk and slab lasers and fiber lasers operating in a mode instability regime.",
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Large brightness enhancement for quasi-continuous beams by diamond Raman laser conversion. / Bai, Zhenxu; Williams, Robert J.; Jasbeer, Hadiya; Sarang, Soumya; Kitzler, Ondrej; McKay, Aaron; Mildren, Richard P.

In: Optics Letters, Vol. 43, No. 3, 01.02.2018, p. 563-566.

Research output: Contribution to journalArticleResearchpeer-review

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AU - McKay, Aaron

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