Tunable mid-infrared (63–12 μm)optical vortex pulse generation

Furuki, Kenji; Horikawa, Michael-Tomoki; Ogawa, Azusa; Miyamoto, Katsuhiko; Omatsu, Takashige

doi:10.1364/oe.22.026351

Cited by 32 publications

(14 citation statements)

References 34 publications

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“…With this concave-concave resonator design, the use of two KTP crystals simultaneously in a cascaded configuration was also investigated (Setup C) [42]. This enabled the wavelength tuning of both the signal and idler waves, and compensation of walk-off of the idler beam.…”

Section: Concave-concave Opo Resonator Using Ktp (Setup B)mentioning

confidence: 99%

“…In this work, the signal and idler output from the plano-concave resonator incorporating cascaded KTP crystals (Setup C) was focussed into a zinc germanium phosphide (ZGP) crystal for DFG conversion under Type-I phase matching. It was found that through tuning of the signal and idler wavelengths, the resultant DFG field could be wavelength tuned through a range 6.3-12 μm, significantly extending the wavelength reach of vortex laser beams into the mid/far infra-red [42].…”

Section: Difference-frequency Generation Of Vortex Beamsmentioning

confidence: 99%

“…Details of each resonator element used in the different OPO configurations examined in Refs [40][41][42][43]…”

mentioning

confidence: 99%

See 2 more Smart Citations

Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion

Lee¹,

Omatsu²

2017

Vortex Dynamics and Optical Vortices

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Vortex laser beams are a technology that has revolutionised applications in micro-and nano-manipulation, micro-fabrication and super-resolution microscopy, and is now heralding advances in quantum communication. In order to service these, and emergent applications, the ability to generate powerful vortex laser beams with user-controlled spatial and wavefront properties, and importantly wavelength, is required. In this chapter, we discuss methods of generating vortex laser beams using both external beam conversion methods, and directly from a laser resonator. We then examine the wavelength conversion of vortex laser beams through non-linear processes of stimulated Raman scattering (SRS), sum-frequency generation (SFG), second harmonic generation (SHG) and optical parametric oscillation. We reveal that under different types of non-linear wavelength conversion, the spatial and wavefront properties of the vortex modes change, and in some cases, the spatial profile also evolve under propagation. We present a theoretical model which explains these dynamics, through decomposition of the vortex mode into constituent Hermite-Gaussian modes of the laser resonator.

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Section: Concave-concave Opo Resonator Using Ktp (Setup B)mentioning

confidence: 99%

Section: Difference-frequency Generation Of Vortex Beamsmentioning

confidence: 99%

See 1 more Smart Citation

Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion

Lee¹,

Omatsu²

2017

Vortex Dynamics and Optical Vortices

Self Cite

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“…10 Most commonly used for higher power operation are SPPs due to their high damage thresholds. [11][12][13] However, they have inherent restrictions, since they do not allow real-time handedness switching and only operate at a specified wavelength. Direct output of vortex modes from a laser cavity, a so-called vortex laser, can have many benefits.…”

Section: Introductionmentioning

confidence: 99%

Q-switched vortex laser using a Sagnac interferometer as an output coupler

Geberbauer

Kerridge-Johns

Damzen

2020

Solid State Lasers XXIX: Technology and Devices

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Vortex lasers are an attractive prospect for efficient generation of high-quality beams in compact, environmentally robust, and turnkey systems. We demonstrate conversion of a Q-switched, diode-pumped Nd:YVO 4 , TEM 00 Gaussian laser into a vortex laser source by replacing the output coupling mirror by a vortex output coupler (VOC) based on an imbalanced Sagnac interferometer. The Q-switched VOC laser generated a vortex output with 5.1 W average power, slope efficiency of 46% at 150 kHz pulse repetition rate, only marginally lower than the 5.4 W and 49% slope efficiency of the plane mirror laser. Vortex handedness was switchable with a single VOC control without loss of vortex power. In both handedness cases the vortex mode quality was assessed to be excellent by detailed analysis of vortex phase profile and propagation characteristics and comparison to an ideal vortex. The power scaling potential of the VOC was demonstrated in a higher power cavity, achieving a vortex output power of 14.3 W and a slope efficiency of 55%. Further investigation verified the ability for the VOC laser to self-mode-filter the intracavity mode, showing maintenance of high TEM 00 quality even after introducing deliberate mode to pump size mismatch, when the equivalent plane mirror laser becomes multimode. This work highlights the potential of the VOC as a simple route to high powered structured light sources using just standard high-power handling mirror components and its self-mode-filtering property to compensate intra-cavity spatial mode degradation when power-scaling.

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“…Within the same fields of application, THz pulses are increasingly becoming of scientific interest [8][9][10][11][12]. In this Letter, we derive the selection rules for the transduction of OAM during optical rectification (OR) and difference frequency generation (DFG) processes [13,14] from infrared to THz. Moreover, this work can be considered an extension of pulse shaping theories [15][16][17].…”

mentioning

confidence: 99%

Selection rules for the orbital angular momentum of optically produced THz radiation

et al. 2021

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In this work, we theoretically study the transduction of orbital angular momentum (OAM) l for infrared pump lasers into the THz domain. In the case of optical rectification, the transduction of OAM occurs only through a spin–orbit interaction, with the selection rule on the OAM l = 0 valid for any kind of polarization of the pump, which means that there is no transfer of OAM along the propagation axis. In difference frequency generation, the selection rule for the difference Δ l between the OAM of the pump fields with linear or circular polarization is l = Δ l , whereas l ranges from Δ l − 2 to Δ l + 2 in cases of both radial and azimuthal polarization. Moreover, for THz generation in the latter case, the high diffraction obtained with tightly focused pumps yields l tending to Δ l ± 2 , while l tends to zero in the opposite case of large pump beams.

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Tunable mid-infrared (63–12 μm)optical vortex pulse generation

Cited by 32 publications

References 34 publications

Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion

Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion

Q-switched vortex laser using a Sagnac interferometer as an output coupler

Selection rules for the orbital angular momentum of optically produced THz radiation

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