Dynamic optical methods for direct laser written waveguides

Salter, Patrick S.; Booth, Martin J.

doi:10.1117/12.2005054

Cited by 5 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We therefore introduced a further stage to optimize the hologram. Stage 2 of the algorithm updates the phase pattern based on the experimental measurement of two-photon fluorescence from each focus [40,41]. We also introduced an intensity factor, Q m , which allows a different target intensity for each spot.…”

Section: Hologram Designmentioning

confidence: 99%

Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time

Sun

Salter

Roider³

et al. 2017

Light Sci Appl

102

View full text Add to dashboard Cite

The spectral dispersion of ultrashort pulses allows the simultaneous focusing of light in both space and time, which creates so-called spatiotemporal foci. Such space–time coupling may be combined with the existing holographic techniques to give a further dimension of control when generating focal light fields. In the present study, it is shown that a phase-only hologram placed in the pupil plane of an objective and illuminated by a spatially chirped ultrashort pulse can be used to generate three-dimensional arrays of spatio-temporally focused spots. By exploiting the pulse front tilt generated at focus when applying simultaneous spatial and temporal focusing (SSTF), it is possible to overlap neighboring foci in time to create a smooth intensity distribution. The resulting light field displays a high level of axial confinement, with experimental demonstrations given through two-photon microscopy and the non-linear laser fabrication of glass.

show abstract

Section: Hologram Designmentioning

confidence: 99%

Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time

Sun

Salter

Roider³

et al. 2017

Light Sci Appl

102

View full text Add to dashboard Cite

show abstract

“…This would aid quality control during fabrication, allowing monitoring to ensure uniformity of the waveguides throughout the chip. This is particularly important when manufacturing three dimensional photonic circuits as depth dependent aberrations can affect the focal intensity distribution of the fabrication beam [20][21][22]. It would also enable online adjustment of the fabrication procedure to ensure that the waveguide network may display cer- tain desired properties.…”

Section: Live Acquisition Of Phase Profiles During Fabricationmentioning

confidence: 99%

Refractive index profiling of direct laser written waveguides: tomographic phase imaging

Jesacher¹,

Salter²,

Booth³

2013

Opt. Mater. Express

Self Cite

View full text Add to dashboard Cite

We present a technique to measure the refractive index profile of direct laser written waveguides. This method has the potential for straightforward implementation in an existing laser fabrication system. Quantitative phase microscopy, based on the Transfer of Intensity equation, is used to analyse waveguides fabricated with an ultrashort pulsed laser embedded several hundred micron below the surface of fused silica. It is shown that the cumulative phase change induced by the waveguide perpendicular to its axis may be monitored in real-time during the fabrication process. Results are verified through comparison with interferometry. Tomographic measurements using illumination from a high numerical aperture condenser lens are used to infer the waveguide cross-section. Results are compared with measurements of the waveguide cross-section from a third harmonic generation microscope.

show abstract

“…Using a computer-generated hologram, multiple foci can be positioned in three dimensions [92,93]. This enables the single-sweep writing of several waveguides [94][95][96][97] or the inscription of multiscan waveguides in a single pass [98].…”

Section: Spherical Aberrationsmentioning

confidence: 99%

Ultrafast-laser-inscribed 3D integrated photonics: challenges and emerging applications

2015

View full text Add to dashboard Cite

Since the discovery that tightly focused femtosecond laser pulses can induce a highly localised and permanent refractive index modification in a large number of transparent dielectrics, the technique of ultrafast laser inscription has received great attention from a wide range of applications. In particular, the capability to create three-dimensional optical waveguide circuits has opened up new opportunities for integrated photonics that would not have been possible with traditional planar fabrication techniques because it enables full access to the many degrees of freedom in a photon. This paper reviews the basic techniques and technological challenges of 3D integrated photonics fabricated using ultrafast laser inscription as well as reviews the most recent progress in the fields of astrophotonics, optical communication, quantum photonics, emulation of quantum systems, optofluidics and sensing.

show abstract

Dynamic optical methods for direct laser written waveguides

Cited by 5 publications

References 20 publications

Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time

Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time

Refractive index profiling of direct laser written waveguides: tomographic phase imaging

Ultrafast-laser-inscribed 3D integrated photonics: challenges and emerging applications

Contact Info

Product

Resources

About