Visible Raman-Shifted Fiber Lasers for Biophotonic Applications

Runcorn, T. H.; Görlitz, Frederik; Murray, R.; Kelleher, E. J. R.

doi:10.1109/jstqe.2017.2770101

Cited by 32 publications

(12 citation statements)

References 38 publications

(40 reference statements)

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“…The depletion laser is a custom-built frequency-doubled, Ramanshifted fiber laser providing pulses of 100's ps duration at a wavelength of 560 nm. [12] The temporal profile of the pulse and repetition rate can be adjusted, for example, to optimize performance with a specific fluorophore. The pulsed excitation and depletion lasers are synchronized and beams from each laser with orthogonal polarization states are coupled into a single-mode, polarization maintaining optical fiber.…”

Section: Easyslm-stedmentioning

confidence: 99%

easySLM‐STED: Stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning

Görlitz

Guldbrand

Runcorn

et al. 2018

Journal of Biophotonics

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We demonstrate a simplified set-up for STED microscopy with a straightforward alignment procedure that uses a single spatial light modulator (SLM) with collinear incident excitation and depletion beams to provide phase modulation of the beam profiles and correction of optical aberrations. We show that this approach can be used to extend the field of view for STED microscopy by correcting chromatic aberration that otherwise leads to walk-off between the focused excitation and depletion beams. We further show how this arrangement can be adapted to increase the imaging speed through multibeam excitation and depletion. Fine adjustments to the alignment can be accomplished using the SLM only, conferring the potential for automation.

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Section: Easyslm-stedmentioning

confidence: 99%

easySLM‐STED: Stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning

Görlitz

Guldbrand

Runcorn

et al. 2018

Journal of Biophotonics

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“…In recent years, our group has demonstrated such sources at 1.12 µm, 1.18 µm and 1.24 µm, which were all then subsequently frequency doubled for biophotonics imaging applications. [27][28][29][30][31] However, as we demonstrate in this work, NIR Raman fiber systems are also highly suitable for upconversion to the MIR.…”

Section: Stimulated Raman Scattering In Optical Fibersmentioning

confidence: 86%

Seeded optical parametric generation in CdSiP2 pumped by a nanosecond pulsed, MHz repetition rate Raman fiber amplifier at 1.24 µm

Murray

Chandran

Battle

et al. 2021

Nonlinear Frequency Generation and Conversion: Materials and Devices XX

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We report a CdSiP 2 (CSP) based seeded optical parametric generator (OPG), emitting sub-nanosecond duration, 3 MHz repetition rate, wavelength tunable mid-infrared (MIR) light at 4.2-4.6 µm. We generate up to 0.25 W at 4.2 µm with a total pump conversion efficiency of 42%. The OPG is pumped by a 1.24 µm Raman fiber amplifier system. This is the first demonstration of pumping CSP with a Raman fiber source in this region, and we show that Raman fiber sources in the near-infrared (NIR) are ideal pump sources for non-critically phasematched (NCPM) CSP devices. Pumping CSP at 1.24 µm permits the use of NCPM whilst decreasing the negative effects of both two-photon absorption and linear absorption losses, when compared to conventional 1 µm pumping. This offers a potential advantage for MIR power scaling of CSP parametric devices due to a reduced thermal load in the crystal from residual pump absorption. The OPG is seeded with a continuous-wave fiber supercontinuum source emitting radiation in the 1.7 µm region, to lower the threshold pump intensity required for efficient conversion. NCPM and temperature tuning of the crystal allow for simple wavelength tuning of the idler radiation. We report on laser damage induced by elevated crystal temperatures, which we propose is linked to the decrease in CSP bandgap energy with increasing temperature.

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“…[ 6–9 ] To‐date, most laser systems which combine both SRS and SFM processes make use of separate SRS and SFM nonlinear optical crystals. [ 10–15 ] RbTiOPO 4 (RTP), in addition to having a high Raman gain coefficient, also has a very high second order nonlinear optical coefficient and as such, has been used as a crystal for SFM, SRS, and stimulated polariton scattering, with each effect nonlinear process being used in isolation. [ 16,17 ] However, to the best of our knowledge, there have been no reports of the use of RTP as a combined SRS and SFG crystal (similar to what has been demonstrated using its isomorph KTiOAsO 4 (KTA)), [ 18–20 ] and this forms the focus of our work.…”

Section: Introductionmentioning

confidence: 99%

Self‐Frequency‐Mixing Raman Laser Based on RbTiOPO₄

et al. 2022

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In this work, the generation of yellow laser emission from a self‐frequency‐mixing Raman laser utilizing RbTiOPO4 (RTP) is reported. The RTP crystal is positioned within the cavity of a Nd:YAG/Cr4+:YAG composite, passively Q‐switched laser. By utilizing this intracavity configuration, Raman conversion of the fundamental laser wavelength to Stokes wavelengths and frequency mixing of these near‐infrared wavelengths to the visible wavelength range is achieved using a single RTP crystal. Multiple visible wavelengths are generated, with a primary line at 574.3 nm and additional weaker lines at 552.3 and 563.9 nm. An average output power of 180 mW is measured from the output coupler end of the laser setup (note that laser emission in the visible wavelength range is also generated toward the input end of the laser cavity) for an incident pump power of 11.4 W. The results demonstrate the potential of RTP as a self‐frequency‐mixing, Raman crystal, which may be used for the development of efficient and compact yellow lasers.

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Visible Raman-Shifted Fiber Lasers for Biophotonic Applications

Cited by 32 publications

References 38 publications

easySLM‐STED: Stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning

easySLM‐STED: Stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning

Seeded optical parametric generation in CdSiP2 pumped by a nanosecond pulsed, MHz repetition rate Raman fiber amplifier at 1.24 µm

Self‐Frequency‐Mixing Raman Laser Based on RbTiOPO₄

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Visible Raman-Shifted Fiber Lasers for Biophotonic Applications

Cited by 32 publications

References 38 publications

easySLM‐STED: Stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning

easySLM‐STED: Stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning

Seeded optical parametric generation in CdSiP2 pumped by a nanosecond pulsed, MHz repetition rate Raman fiber amplifier at 1.24 µm

Self‐Frequency‐Mixing Raman Laser Based on RbTiOPO4

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Self‐Frequency‐Mixing Raman Laser Based on RbTiOPO₄