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Fibre-laser-pumped femtosecond PPLN OPO

Fibre-laser-pumped femtosecond PPLN OPO
Fibre-laser-pumped femtosecond PPLN OPO
High-power fibre laser systems are an emerging technology for compact, robust and stable generation of ultrashort pulses. Their power levels have now converged with the power levels needed for efficient frequency conversion in quasi phase matched (QPM) nonlinear materials such as periodically poled LiNbO3 (PPLN). The combination of these two technologies is seen as an attractive method for producing broadly tunable ultrashort pulses.

Here we present results of a synchronously pumped optical parametric oscillator (SPOPO) in PPLN, pumped by an Yb-doped, fibre laser source[1] in a master oscillator power amplifier scheme. The operating characteristics of this system will be described, including its tuning behaviour, the role of cavity-length-dependent effects, the effect of dispersion and its compensation using an SF10 prism pair.

The experimental set-up is shown in Fig. 1. The high power fibre source generates 300fs pulses at a repetition rate of 54MHz, delivering a maximum average power of 200mW to the OPO. An operating pump wavelength of 1.056µm was chosen for these experiments. For the SPOPO, a 5mm-long PPLN crystal was used with grating periods covering the signal range 1.65-2.1 µm (implied idler output 2.1 - 3.0 µm). A threshold of 20mW was measured for the case of an all high reflector cavity.

The performance confirms the practicality of combining fibre laser systems with synchronously pumped OPOs. The low threshold and associated high gain suggest that the recently demonstrated use of a diffraction grating, in a picosecond SPOPO, to provide agile tuning, should be compatible with this femtosecond system. Ongoing work is aimed at demonstrating this.

Fig. 1 - Schematic of OPO set-up.
O'Connor, M.V.
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Watson, M.A.
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Hanna, D.C.
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Shepherd, D.P.
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Lefort, L.
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Price, J.H.V.
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Malinowski, A.
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Nilsson, J.
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Broderick, N.G.R.
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Richardson, D.J.
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O'Connor, M.V.
db2f4543-aa5b-4177-afeb-ad30941263a5
Watson, M.A.
6701a8c8-7537-48e0-bd7e-acf50d52e0f4
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Shepherd, D.P.
9fdd51c4-39d6-41b3-9021-4c033c2f4ead
Lefort, L.
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Price, J.H.V.
fddcce17-291b-4d01-bd38-8fb0453abdc8
Malinowski, A.
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Nilsson, J.
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Broderick, N.G.R.
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Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3

O'Connor, M.V., Watson, M.A., Hanna, D.C., Shepherd, D.P., Lefort, L., Price, J.H.V., Malinowski, A., Nilsson, J., Broderick, N.G.R. and Richardson, D.J. (2001) Fibre-laser-pumped femtosecond PPLN OPO. QEP-15: 15th Biennial Meeting of the Institute of Physics Quantum Electronics and Photonics Group, United Kingdom. 03 - 06 Sep 2001. 1 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

High-power fibre laser systems are an emerging technology for compact, robust and stable generation of ultrashort pulses. Their power levels have now converged with the power levels needed for efficient frequency conversion in quasi phase matched (QPM) nonlinear materials such as periodically poled LiNbO3 (PPLN). The combination of these two technologies is seen as an attractive method for producing broadly tunable ultrashort pulses.

Here we present results of a synchronously pumped optical parametric oscillator (SPOPO) in PPLN, pumped by an Yb-doped, fibre laser source[1] in a master oscillator power amplifier scheme. The operating characteristics of this system will be described, including its tuning behaviour, the role of cavity-length-dependent effects, the effect of dispersion and its compensation using an SF10 prism pair.

The experimental set-up is shown in Fig. 1. The high power fibre source generates 300fs pulses at a repetition rate of 54MHz, delivering a maximum average power of 200mW to the OPO. An operating pump wavelength of 1.056µm was chosen for these experiments. For the SPOPO, a 5mm-long PPLN crystal was used with grating periods covering the signal range 1.65-2.1 µm (implied idler output 2.1 - 3.0 µm). A threshold of 20mW was measured for the case of an all high reflector cavity.

The performance confirms the practicality of combining fibre laser systems with synchronously pumped OPOs. The low threshold and associated high gain suggest that the recently demonstrated use of a diffraction grating, in a picosecond SPOPO, to provide agile tuning, should be compatible with this femtosecond system. Ongoing work is aimed at demonstrating this.

Fig. 1 - Schematic of OPO set-up.

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More information

e-pub ahead of print date: 2001
Venue - Dates: QEP-15: 15th Biennial Meeting of the Institute of Physics Quantum Electronics and Photonics Group, United Kingdom, 2001-09-03 - 2001-09-06

Identifiers

Local EPrints ID: 17142
URI: https://eprints.soton.ac.uk/id/eprint/17142
PURE UUID: 771353b8-9c77-4c3a-b3e0-d78496e8fb15
ORCID for D.P. Shepherd: ORCID iD orcid.org/0000-0002-4561-8184
ORCID for J.H.V. Price: ORCID iD orcid.org/0000-0003-0256-9172
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959
ORCID for D.J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058

Catalogue record

Date deposited: 16 Sep 2005
Last modified: 06 Mar 2019 01:37

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Contributors

Author: M.V. O'Connor
Author: M.A. Watson
Author: D.C. Hanna
Author: D.P. Shepherd ORCID iD
Author: L. Lefort
Author: J.H.V. Price ORCID iD
Author: A. Malinowski
Author: J. Nilsson ORCID iD
Author: N.G.R. Broderick
Author: D.J. Richardson ORCID iD

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