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Hot embossing method for development of soft glass microoptic components with broadband infrared transmission

Kasztelaniec R., Buczyński R., Cimek J., Kujawa I., Stępień R., Kozłowska A., Maląg A., Waddie A. J., Taghizadeh M. R.

Elektronika : konstrukcje, technologie, zastosowania

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2014

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Vol. 55, nr 11

108-110

EN

We describe the application of the hot embossing process to fabricate micro-optical elements using soft glasses with enhanced tramsmission in mid infrared. The fabricated elements are both refractive lenses and diffractive elements) that can be used in the visible to mid-infrared range 0.5…5 μm.

PL

W artykule przedstawiono zastosowanie metody odciskania na gorąco do wytwarzania elementów mikrooptycznych ze szkieł tlenkowych wieloskładnikowych o wysokiej transmitancji w zakresie średniej podczerwieni. Metoda została użyta do wytworzenia elementów refrakcyjnych oraz dyfrakcyjnych przeznaczonych do zastosowań w zakresie szerokopasmowym od 0,5 do 5 μm.

2

Modelling of vertical-cavity surface-emitting laser beam collimation using a nanostructured gradient index microlens

Nowosielski J M, Waddie A. J., Taghizadeh M. R., Buczynski R.

Optica Applicata

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2013

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Vol. 43, nr 4

761--772

EN

In this paper we show that the recently developed nanostructured gradient index (nGRIN) rod microlens can be utilised for the collimation of the beam generated by a vertical-cavity surface-emitting laser (VCSEL). The modelling of the nanostructured lens structure is performed using the finite difference time domain (FDTD) method with realistic nGRIN parameters and a Gaussian model of the light source. The large refractive index gradient of the nanostructured microlens allows the final microlens thickness to be only 70 μm with a diameter of 10 μm. Successful collimation of a single-mode VCSEL beam with a waist half-width of 1.53 μm is presented with a reduction in divergence half-angle from 10.1° to 3.3°. We show that the linear polarisation of the incident beam is preserved as well as presenting the tolerance of this type of lens to variations in overall thickness.

3

Superprism effect in all-glass volumetric photonic crystals

Filipkowski A., Buczyński R., Waddie A. J., Kujawa I., Pysz D., Taghizadeh M. R., Stępień R.

Opto-Electronics Review

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2012

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Vol. 20, No. 3

267-274

EN

This paper focuses on the superprism effect which can be obtained in low-contrast photonic crystals. The modelling is related to the newly developed method for all-dielectric photonic crystals. This places material constraints on the simulated crystals which limit the refractive index difference to 0.1 for all-glass photonic crystals and 0.6 for air-glass structures and forces us to focus on hexagonal lattices. The simulations show the existence of superprism effect in both types of structure for realistic glasses. In both cases various linear filling factors are studied in order to maximize the frequency range of the superprism effect. For the air-F2 glass structure it reaches 0.108 normalized frequencies and for the air-NC21 glass structure it reaches 0.99 normalized frequencies for TM polarization. For the double glass structures, the largest range is for the F2/NC21 photonic crystal and spans 0.012 normalized frequencies. In the F2/NC21 crystal the frequency range reaches 0.005 for TE polarization.

4

Dispersion management in soft glass all-solid photonic crystal fibres

Buczynski R., Pniewski J., Pysz D., Stepien R., Kasztelanic R., Kujawa I., Filipkowski A., Waddie A. J., Taghizadeh M. R.

Opto-Electronics Review

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2012

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Vol. 20, No. 3

207-215

EN

The development of all-solid photonic crystal fibres for nonlinear optics is an alternative approach to air-glass solid core photonic crystal fibres. The use of soft glasses ensures a high refractive index contrast (> 0.1) and a high nonlinear coefficient of the fibres. We report on the dispersion management capabilities in all-solid photonic crystal fibres taking into account four thermally matched glasses which can be jointly processed using the stack-and-draw fibre technique. We present structures with over 450 nm broadband flat normal dispersion and ultra-flat near zero anomalous dispersion below 5 ps/nm/km over 300 nm dedicated to supercontinuum generation with 1540 nm laser sources. The development of an all-solid photonic crystal fibre made of F2 and NC21 glasses is presented. The fibre is used to demonstrate supercontinuum generation in the range of 730–870 nm (150 nm) with flatness below 5 dB.

5

Near infrared transmission in dual core lead silicate photonic crystal fibres

Bookey H. T., Buczyński R., Wischnewski A., Pysz D., Kasztelanic R., Waddie A. J., Stepien R., Kar A. K., Taghizadeh M. R.

Optica Applicata

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2012

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Vol. 42, nr 1

75-83

EN

Photonic crystal fibres (PCF) can provide the high confinement needed to enable nonlinear optical processes to be studied in silicate fibre over short lengths without the need for large pulse energies. Additionally, the capillary stacking technique for PCF fabrication lends itself to the design of multiple core fibres and this capability has triggered much work into the properties of dual core PCF. In this paper, the effect of the dual core interaction on the nonlinear wavelength conversion is studied using a femtosecond oscillator in the near IR range. Effective supercontinuum generation in the range 1300-1700 nm is achieved in the anomalous dispersion regime.