Continuous wave, 30 W laser-diode bar with 10 GHz linewidth for Rb laser pumping

Abstract

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Generation of laser-polarized xenon using fiber-coupled laser-diode arrays narrowed with integrated volume holographic gratings

“…Alternatively, VHGs (a.k.a. volume Bragg gratings (VBGs)) can achieve LDA spectral narrowing with efficiencies exceeding 90% [20]. VHGs are bulk slabs of photosensitive glass [21] containing Bragg planes of varying index of refraction; in a VHG-based external-cavity diode laser array (VHG-ECDL, Fig.…”

Development of stable, narrow spectral line-width, fiber delivered laser source for spin exchange optical pumping

“…The diffraction grating external cavity provides a large tunable range of the center wavelength of ∼10 nm [6][7][8][9]. Meanwhile the volume holographic grating (VHG) external cavity has a smaller footprint with a limited tunable center wavelength range of <0.5 nm [10][11][12][13]. The resonant wavelength of a VHG can be precisely tuned with temperature control.…”

Low-loss smile-insensitive external frequency-stabilization of high power diode lasers enabled by vertical designs with extremely low divergence angle and high efficiency

“…BA lasers stabilized using internal distributed Bragg gratings have recently demonstrated reliable powers and efficiencies (η E = 58% at P out = 10 W [13,14]) close to that of un-stabilized devices, and reduce the channel spacing to < 2 nm, due to their narrow spectrum and reduced temperature sensitivity (Δλ 95% < 1 nm and δλ/δT ~ 0.08 nm/K [13,14]). Wavelength stabilization of BA lasers using external gratings is also in wide use [7][8][9][10][11][15][16][17][18][19][20][21], and extremely narrow, highly temperature stable spectra are possible, even in high power systems (a linewidth of < 100 GHz and δλ/δT < 0.01 nm/K have been demonstrated). Such narrow, stable spectra are needed (for example) for pumping narrow lines in Alkali-laser systems (see [16,19] and references within).…”

“…Wavelength stabilization of BA lasers using external gratings is also in wide use [7][8][9][10][11][15][16][17][18][19][20][21], and extremely narrow, highly temperature stable spectra are possible, even in high power systems (a linewidth of < 100 GHz and δλ/δT < 0.01 nm/K have been demonstrated). Such narrow, stable spectra are needed (for example) for pumping narrow lines in Alkali-laser systems (see [16,19] and references within). However, external spectral stabilization adds system complexity and hence cost, reduces efficiency and power and can lead to lower reliable power levels [10,20].…”