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Externally modulated diode seeded Yb3+- doped fiber MOPA pumped high power optical parametric oscillator

Externally modulated diode seeded Yb3+- doped fiber MOPA pumped high power optical parametric oscillator
Externally modulated diode seeded Yb3+- doped fiber MOPA pumped high power optical parametric oscillator
Here we report a high power, pulsed optical parametric oscillator (OPO) at 3.5µm by using a MgO:PPLN crystal as the gain medium. The OPO itself was pumped by a semiconductor diode-seeded, Yb3+-doped fiber Master Oscillator Power Amplifier (MOPA) operating at 1062nm. An OPO output power as high as 11W at an overall slope efficiency of 67% was achieved, with nearly 2.7W and 8.2W of optical power obtained at 3.5µm and 1.5µm respectively. Due to the fast response time of the external modulator, it is possible to implement active pulse shaping on a nanosecond time-scale. Using adaptive pulse shaping of the seed laser (using an external modulator) we demonstrated a reduction in the impact of dynamic gain saturation and optical Kerr/Raman nonlinearities within the fibre MOPA obtaining shaped signal and idler pulses at the OPO output and reduced spectral bandwidths. We have also investigated the dependence of the OPO build-up time and energy transfer efficiency on pump pulse peak power and shape. The build-up time shows an exponential dependence on the pulse peak power and as expected decreases with an increase in pulse peak power. Analyzing the shift in spectral peak at 1.5µm it is possible to estimate the internal temperature of the crystal for various pump powers. Our experiments were pump-power limited and considerable scope remains for further power-scaling of the OPO output using this approach.
Alam, S.U.
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Chen, Kangkang
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Lin, Dejiao
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Shen, Yonghang
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Cai, Shuangshuang
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Wu, Bo
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Jiang, Peipei
175d43a2-ddab-4e25-aeef-d345e326b023
Malinowski, Andrew
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Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Alam, S.U.
2b6bdbe5-ddcc-4a88-9057-299360b93435
Chen, Kangkang
37c5f50d-c027-44bb-ac51-23624f4ebcd4
Lin, Dejiao
3f549d76-a6b0-47a7-a1be-c0daa7d47468
Shen, Yonghang
a6f49b6b-53e4-48c2-8265-9bc66bee535f
Cai, Shuangshuang
f0e3a374-a1b6-4ab4-a328-521086384d3a
Wu, Bo
749fc032-a3ee-45e7-a5f0-5074fa55ef56
Jiang, Peipei
175d43a2-ddab-4e25-aeef-d345e326b023
Malinowski, Andrew
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3

Alam, S.U., Chen, Kangkang, Lin, Dejiao, Shen, Yonghang, Cai, Shuangshuang, Wu, Bo, Jiang, Peipei, Malinowski, Andrew and Richardson, David (2009) Externally modulated diode seeded Yb3+- doped fiber MOPA pumped high power optical parametric oscillator. Photonics West 2009, San Jose, United States. 24 - 29 Jan 2009. 1 pp . (doi:10.1117/12.813658).

Record type: Conference or Workshop Item (Paper)

Abstract

Here we report a high power, pulsed optical parametric oscillator (OPO) at 3.5µm by using a MgO:PPLN crystal as the gain medium. The OPO itself was pumped by a semiconductor diode-seeded, Yb3+-doped fiber Master Oscillator Power Amplifier (MOPA) operating at 1062nm. An OPO output power as high as 11W at an overall slope efficiency of 67% was achieved, with nearly 2.7W and 8.2W of optical power obtained at 3.5µm and 1.5µm respectively. Due to the fast response time of the external modulator, it is possible to implement active pulse shaping on a nanosecond time-scale. Using adaptive pulse shaping of the seed laser (using an external modulator) we demonstrated a reduction in the impact of dynamic gain saturation and optical Kerr/Raman nonlinearities within the fibre MOPA obtaining shaped signal and idler pulses at the OPO output and reduced spectral bandwidths. We have also investigated the dependence of the OPO build-up time and energy transfer efficiency on pump pulse peak power and shape. The build-up time shows an exponential dependence on the pulse peak power and as expected decreases with an increase in pulse peak power. Analyzing the shift in spectral peak at 1.5µm it is possible to estimate the internal temperature of the crystal for various pump powers. Our experiments were pump-power limited and considerable scope remains for further power-scaling of the OPO output using this approach.

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e-pub ahead of print date: January 2009
Venue - Dates: Photonics West 2009, San Jose, United States, 2009-01-24 - 2009-01-29

Identifiers

Local EPrints ID: 76276
URI: https://eprints.soton.ac.uk/id/eprint/76276
PURE UUID: 852d9b06-a7eb-4240-ab60-82080c9258ec
ORCID for David Richardson: ORCID iD orcid.org/0000-0002-7751-1058

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Date deposited: 17 Mar 2010
Last modified: 13 Aug 2019 00:39

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