Henry T. Bookey

Ultrafast-laser inscription of a three dimensional fan-out device for multicore fiber coupling applications

A three dimensional fan-out device has been fabricated using ultrafast laser inscription. The device allows each core of a multicore fibre to be addressed individually by a single mode fiber held in an FVA.

Nonlinear optical properties of chalcogenide glasses: Observation of multiphoton absorption

We report observation of four- and five-photon absorption in the chalcogenide glasses at the telecommunication wavelengths. The nonlinear refractive index is sufficiently large that the optical switching criterion is satisfied.

Er:Yb-doped oxyfluoride silicate glass waveguide amplifier fabricated using femtosecond laser inscription

The authors report net gain from a channel waveguide fabricated in an Er:Yb-doped oxyfluoride silicate glass substrate using femtosecond laser waveguide inscription. To fabricate waveguides exhibiting low propagation and coupling losses, they used the recently demonstrated multiscan technique that allows the waveguide cross section and refractive index contrast to be controlled independently of each other. By doing so, the best waveguide exhibited a total background insertion loss, excluding absorption, of only 1.2dB at 1537nm. As a result, a fiber-fiber net gain of 0.72dB at 1537nm was measured for a 10mm long waveguide.The authors report net gain from a channel waveguide fabricated in an Er:Yb-doped oxyfluoride silicate glass substrate using femtosecond laser waveguide inscription. To fabricate waveguides exhibiting low propagation and coupling losses, they used the recently demonstrated multiscan technique that allows the waveguide cross section and refractive index contrast to be controlled independently of each other. By doing so, the best waveguide exhibited a total background insertion loss, excluding absorption, of only 1.2dB at 1537nm. As a result, a fiber-fiber net gain of 0.72dB at 1537nm was measured for a 10mm long waveguide.

Femtosecond laser writing of waveguides in periodically poled lithium niobate preserving the nonlinear coefficient

Optical waveguides have been inscribed in periodically poled lithium niobate by femtosecond laser pulses with the multiscan technique. Second harmonic generation experiments from a fundamental wavelength of 1567nm demonstrate that the nonlinear optical coefficient in the waveguides is preserved, yielding a conversion efficiency of 18%W−1.

Supercontinuum generation in an ultrafast laser inscribed chalcogenide glass waveguide.

We report on the fabrication and characterisation of waveguides fabricated in a GeS based chalcogenide glass. A wide range of waveguiding structures were fabricated, and supercontinuum generation was demonstrated for a highly multimode waveguide.

Ultrafast laser inscription of near-infrared waveguides in polycrystalline ZnSe

We report the successful fabrication of a low-loss near-IR waveguide in polycrystalline ZnSe using ultrafast laser inscription. The waveguide, which was inscribed using the multiscan fabrication technique, supported a well-confined mode at 1.55 μm. Propagation losses were characterized at 1.55 μm using the Fabry-Perot technique and found to be 1.07 dB · cm(-1) ± 0.03 dB · cm(-1).

Femtosecond Laser Inscription of Low Insertion Loss Waveguides in

A low insertion loss waveguide is fabricated in z-cut lithium niobate using femtosecond laser waveguide inscription. To fabricate a waveguide exhibiting both low propagation and coupling losses, we used the multiscan fabrication technique to control the size of the waveguide cross section. A minimum insertion loss of only 3.5 dB at 1550 nm was measured for the 18-mm-long waveguide when directly coupled to Corning SMF-28 fibers. Of this 3.5dB, we attribute 2.1 dB to coupling losses, 1.1 dB to propagation losses, and 0.3 dB to Fresnel reflections

Z

We report on the fabrication of high quality embedded channel waveguides inside Bi-doped silicate glass using femtosecond waveguide inscription. Waveguides are fabricated using both single and multi-scan fabrication techniques. Refractive index modifications of up to ∆n = 4.3×10-3 are observed, allowing the fabrication of waveguides nearly mode-matched to telecom fibers. When optically pumped at 980 and 810 nm broadband fluorescence emission centered at 1.3 μm with a FWHM of up to 500 nm is detected.

-Cut Lithium Niobate

A channel waveguide is fabricated inside an erbium-doped oxyfluoride silicate glass sample using femtosecond pulses in the low repetition rate regime. The waveguide cross section is controlled using the multiscan fabrication technique. The 1.85-cm-long waveguide exhibits a total background insertion loss of 4.3 dB when coupled to Corning SMF-28 fibers. Under the maximum available pump power, the device exhibits an internal gain of 1.7 dB at 1537 nm.

Femtosecond laser inscription of optical waveguides in Bismuth ion doped glass

We demonstrate laser action from a waveguide fabricated in an Er:Yb-doped silicate glass using femtosecond laser inscription. Waveguides were fabricated using a diode-pumped Yb:glass oscillator at a 600-kHz repetition rate. The multiscan technique was used to control the waveguide cross section. Textbook threshold characteristics are observed for both 980 nm and dual-wavelength excitation.