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Simplified analysis of double pass amplification with pulse overlap and application to Nd:YVO4 laser

Simplified analysis of double pass amplification with pulse overlap and application to Nd:YVO4 laser
Simplified analysis of double pass amplification with pulse overlap and application to Nd:YVO4 laser
We derive simple and convenient expressions for two-pass saturated amplification with pulse overlap. These have the same form as the single-pass Franz–Nodvik equations but with a factor of two in front of the cross-section for stimulated emission. The predicted decrease in energy extraction efficiency when there is pulse overlap compared with sequential passes agrees well with earlier numerical modelling. This approach has been extended to analyse a two-pass Nd:YVO4 amplifier (diode pumped 2 mm long 1% doped crystal) operated with nanosecond pulses delivered at rates up to 20 kHz and taking account of the Gaussian beam profile. An estimate of γ = 1 × 10-15 cm3 s-1 for the up-conversion macro-parameter was found to provide a consistent value for the length-averaged gain coefficient and the effective gain lifetime of the amplifier for the pump conditions used.
0030-4018
297-303
Pearce, Stuart
1d0ee7c5-8f72-4783-a034-9b2f67de3531
Ireland, C.L.M
665f404f-8b62-402c-abe0-8f425be03698
Dyer, P.E.
dfaa8155-4db4-4f4b-830e-c4ff0900d97c
Pearce, Stuart
1d0ee7c5-8f72-4783-a034-9b2f67de3531
Ireland, C.L.M
665f404f-8b62-402c-abe0-8f425be03698
Dyer, P.E.
dfaa8155-4db4-4f4b-830e-c4ff0900d97c

Pearce, Stuart, Ireland, C.L.M and Dyer, P.E. (2005) Simplified analysis of double pass amplification with pulse overlap and application to Nd:YVO4 laser. Optics Communications, 255 (4-6), 297-303. (doi:10.1016/j.optcom.2005.06.013).

Record type: Article

Abstract

We derive simple and convenient expressions for two-pass saturated amplification with pulse overlap. These have the same form as the single-pass Franz–Nodvik equations but with a factor of two in front of the cross-section for stimulated emission. The predicted decrease in energy extraction efficiency when there is pulse overlap compared with sequential passes agrees well with earlier numerical modelling. This approach has been extended to analyse a two-pass Nd:YVO4 amplifier (diode pumped 2 mm long 1% doped crystal) operated with nanosecond pulses delivered at rates up to 20 kHz and taking account of the Gaussian beam profile. An estimate of γ = 1 × 10-15 cm3 s-1 for the up-conversion macro-parameter was found to provide a consistent value for the length-averaged gain coefficient and the effective gain lifetime of the amplifier for the pump conditions used.

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More information

Published date: 15 November 2005
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 350319
URI: https://eprints.soton.ac.uk/id/eprint/350319
ISSN: 0030-4018
PURE UUID: 82224b3d-2781-43f6-be2c-d39d5869f833

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Date deposited: 25 Mar 2013 16:28
Last modified: 05 Nov 2018 17:31

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Contributors

Author: Stuart Pearce
Author: C.L.M Ireland
Author: P.E. Dyer

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