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High efficiency second harmonic and sum frequency generation of nanosecond pulses in a cascaded erbium doped fibre:PPLN source

High efficiency second harmonic and sum frequency generation of nanosecond pulses in a cascaded erbium doped fibre:PPLN source
High efficiency second harmonic and sum frequency generation of nanosecond pulses in a cascaded erbium doped fibre:PPLN source
Recently, femtosecond erbium fibre lasers have been used with periodically poled lithium niobate(PPLN) to demonstrate frequency doubling with up to 25% conversion efficiency, and using the second harmonic, to pump an Optical Parametric Generator (OPG). However, for many applications e.g. pumping of nanosecond Optical Parametric Oscillators (OPOs) pulses with greater energies are required, for which diode-pumped, large mode-area erbium doped fibre amplifiers (LA-EDFA) and lasers are ideally suited. The combination of diode-pumped, LA-EDFA sources with periodically poled lithium niobate creates an extremely attractive technology for the development of a wide range of practical wavelength tuneable sources. In this work both diode-seeded LA-EDFA chains and Q-switched sources were used to demonstrate extremely high second and third harmonic single pass conversion efficiencies in PPLN. Continuously tunable operation over the erbium gain bandwidth was demonstrated with pulses from 2 to 50ns, repetition rates from 1kHz to 150kHz, and pulse energies of up to 50µJ.
Output pulses at a fundamental wavelength of 1536nm were frequency doubled in PPLN, to produce 768nm light with internal conversion efficiencies as high as 83% in a single pass for a peak power of 1.2kW. A second PPLN crystal was used to mix the second harmonic with the remaining fundamental to generate green light at 512nm, with up to 34% internal conversion efficiency. Both PPLN samples were 16mm long and fabricated in 0.5mm thick z-cut lithium niobate by electrical poling. The periods were 18.05µm for SHG and 6.5µm for sum frequency generation.
Taverner, D.
b8f04b32-4ce1-4d7d-9fd2-298bff142b96
Britton, P.J.
4cf11f97-e7fa-4caa-8a49-79b9280fbad1
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Ross, G.W.
e881119e-2126-442e-a24d-506dac48a4a4
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Taverner, D.
b8f04b32-4ce1-4d7d-9fd2-298bff142b96
Britton, P.J.
4cf11f97-e7fa-4caa-8a49-79b9280fbad1
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Ross, G.W.
e881119e-2126-442e-a24d-506dac48a4a4
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d

Taverner, D., Britton, P.J., Smith, P.G.R., Richardson, D.J., Ross, G.W. and Hanna, D.C. (1997) High efficiency second harmonic and sum frequency generation of nanosecond pulses in a cascaded erbium doped fibre:PPLN source. Quantum Electronics Conference (QE13), , Cardiff, United Kingdom. 08 - 11 Sep 1997.

Record type: Conference or Workshop Item (Paper)

Abstract

Recently, femtosecond erbium fibre lasers have been used with periodically poled lithium niobate(PPLN) to demonstrate frequency doubling with up to 25% conversion efficiency, and using the second harmonic, to pump an Optical Parametric Generator (OPG). However, for many applications e.g. pumping of nanosecond Optical Parametric Oscillators (OPOs) pulses with greater energies are required, for which diode-pumped, large mode-area erbium doped fibre amplifiers (LA-EDFA) and lasers are ideally suited. The combination of diode-pumped, LA-EDFA sources with periodically poled lithium niobate creates an extremely attractive technology for the development of a wide range of practical wavelength tuneable sources. In this work both diode-seeded LA-EDFA chains and Q-switched sources were used to demonstrate extremely high second and third harmonic single pass conversion efficiencies in PPLN. Continuously tunable operation over the erbium gain bandwidth was demonstrated with pulses from 2 to 50ns, repetition rates from 1kHz to 150kHz, and pulse energies of up to 50µJ.
Output pulses at a fundamental wavelength of 1536nm were frequency doubled in PPLN, to produce 768nm light with internal conversion efficiencies as high as 83% in a single pass for a peak power of 1.2kW. A second PPLN crystal was used to mix the second harmonic with the remaining fundamental to generate green light at 512nm, with up to 34% internal conversion efficiency. Both PPLN samples were 16mm long and fabricated in 0.5mm thick z-cut lithium niobate by electrical poling. The periods were 18.05µm for SHG and 6.5µm for sum frequency generation.

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More information

e-pub ahead of print date: September 1997
Venue - Dates: Quantum Electronics Conference (QE13), , Cardiff, United Kingdom, 1997-09-08 - 1997-09-11

Identifiers

Local EPrints ID: 76768
URI: http://eprints.soton.ac.uk/id/eprint/76768
PURE UUID: a6912baf-c632-430a-95bd-2735445d9d7c
ORCID for P.G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X
ORCID for D.J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058

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Date deposited: 11 Mar 2010
Last modified: 06 Mar 2024 02:35

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Contributors

Author: D. Taverner
Author: P.J. Britton
Author: P.G.R. Smith ORCID iD
Author: D.J. Richardson ORCID iD
Author: G.W. Ross
Author: D.C. Hanna

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