Press releases

Project factsheet
Electro-optics Magazine
Revue Photoniques
Photon Express (in Russian)

General information

Project Flyer
Application tutorial (from PICOQUANT)
General presentation

List of public deliverables

The following deliverables are public and then available upon request (by email):

D1.2: Project presentation and website launching (including press release and project factsheet).

D1.7: Short video about the project ("youtube" like).

D1.8: Summary description of the workshop event(s).

D1.11: Public project report

D2.1: Review of specifications for the different bio-imaging & spectroscopy systems.

D4.5: Report on long term stability of new fibre devices.

D4.6: Report and delivery of a packaging unit for ensuring 1 pm/°C stability in SHG devices.

D6.1: Report on new gain-switched sources integrated into time-resolved microscopy system: 560 nm GS diode with fibre coupled output.

List of publications

Reference 1: Pulse selection at 1 MHz with electrooptic fiber switch
Mikael Malmström, Oleksandr Tarasenko, and Walter Margulis.
Optics Express, Vol. 20, Issue 9, pp. 9465-9470 (2012).

Two 78-cm long electrooptic fibers with nonlinear coefficient χ(2) ~0.26 pm/V are used in a Sagnac loop for pulse selection at up to 1 MHz repetition rate. Laser pulses of 1.5 µm wavelength arriving at every 140 ns are selected with an extinction ratio as high as −30 dB. The arrangement is entirely based on silica fiber.

Reference 2: Soliton generation from an actively mode-locked fiber laser incorporating an electro-optic fiber modulator
Mikael Malmström, Walter Margulis, Oleksandr Tarasenko, Valdas Pasiskevicius, and Fredrik Laurell.
Optics Express, Vol. 20, Issue 3, pp. 2905-2910 (2012).

This work demonstrates an actively mode-locked fiber laser operating in soliton regime and employing an all-fiber electro-optic modulator. Nonlinear polarization rotation is utilized for femtosecond pulse generation. Stable operation of the all-fiber ring laser is readily achieved at a fundamental repetition rate of 2.6 MHz and produces 460 fs pulses with a spectral bandwidth of 5.3 nm.

Reference 3: Specialty Fibres and Components for Advanced Microscopy
Laure Lago, Constantino Corbari, Peter Kazansky, and Yves Hernandez.
Conference Paper, Workshop on Specialty Optical Fibers and their Applications, ISBN: 978-1-55752-984-8, Nonlinear Optics and Applications (F4), (2013).

We investigate fibre basic functions like second harmonic generation for advanced microscopy applications. We present the progress on periodically poled fibres. We achieved 5.2% conversion efficiency into green light with only 50W peak pump power.

Reference 4: All-fiber frequency-doubled visible laser
Costantino Corbari, Alexey V. Gladyshev, Laure Lago, Morten Ibsen, Yves Hernandez and Peter G. Kazansky.
Optics Letters, Vol. 39, Issue 22, pp. 6505-6508 (2014).

All-fiber ns-pulsed visible laser at λ  521 nm is realized by frequency doubling an Yb-doped fiber laser with a periodically poled silica fiber. A 50 mW second-harmonic (SH) output power is produced that is over 6-orders of magnitude greater than previous results obtained with poled fibers in the visible spectral range. The normalized conversion efficiency of 0.3%∕W is to date the largest demonstrated with poled fiber technology. Furthermore, 21% conversion efficiency is achieved for the doubling of 8-ps pulses from a neodymium-doped yttrium vanadate solid-state laser. The advances are made possible by the precision and flexibility offered by using the continuous periodic UV erasure, as opposite to photolithographic methods, for the fabrication of over 20-cm-long χ2-gratings for quasi-phase matched SH generation.

Reference 5: Specialty Fibres and Components for Advanced Microscopy
Laure Lago, Costantino Corbari, Walter Margulis, Alexey Gladyshev, and Yves Hernandez.
Conference Paper, Specialty Optical Fibers, ISBN: 978-1-55752-820-9, Fiber Sensors and Bragg Gratings (SoW3B), (2014).

We investigate fibre basic functions like SHG and pulse gating. We achieved 5.2% conversion efficiency into green light with 50 W peak pump power and demonstrated in-fibre pulse gating at 1 MHz repetition rate.

Reference 6: Multi-Watt All-Fiber Frequency Doubled Laser
E.L. Lim, C. Corbari, A.V. Gladyshev, S.U. Alam, M. Ibsen, D.J. Richardson, and .G. Kazansky.
Conference Paper, Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, ISBN: 978-1-55752-820-9, Advanced Photonics Post Deadline Papers (JTu6A), (2014).

We report a record multi-watt level and up to 45% efficient all-fiber frequency doubling in periodically poled silica fibers. Modulation instability is identified as the primary factor preventing further growth of the second-harmonic power.

Reference 7: Study of thermally poled fibers with a two-dimensional model
Alexandre Camara, Oleksandr Tarasenko, and Walter Margulis.
Optics Express, Vol. 22, Issue 15, pp. 17700-17715 (2014).

A two-dimensional (2D) numerical model is implemented to describe the movement of ions under thermal poling for the specific case of optical fibers. Three types of cations are considered (representing Na+, Li+ and H3O+) of different mobility values. A cross-sectional map of the carrier concentration is obtained as a function of time. The role of the various cations is investigated. The assumptions of the model are validated by comparing the predictions to experimental data of the time evolution of the nonlinearity induced. A variational analysis of poling parameters including temperature, poling voltage, sign of the bias potential and initial ionic concentrations is performed for a particular fiber geometry. The analysis allows identifying the impact of these parameters on the induced second-order nonlinearity in poled fibers.