Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm

Sha Wang; Xin Wang; T. Riesbeck; H. J. Eichler

doi:10.1117/12.822688

Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm

Sha Wang^*, Xin Wang, T. Riesbeck, H. J. Eichler

^*Corresponding author for this work

Technical University of Berlin

Research output: Contribution to journal › Conference article › peer-review

7 Citations (Scopus)

Abstract

Wavelength around 940 nm lasing can be obtained by quasi-three-level operation of Nd doped laser crystal. Diode end pumping provides the necessary high pump intensity in the laser crystal. In order to get high efficiency of the end pumped laser system, the overlap coefficient between pump beam and laser beam should be optimized. Thermal lens coefficient is one of the most important parameters to design the laser cavity structure. The time dependent heat conduction equation is solved numerically in order to study the thermal lens effect in pulsed pumping laser crystal. Calculated results showed that the thermal lens coefficients change with different pump frequencies. Experiments are done with Nd:YAG and Nd:GSAG laser rod. The thermal lens coefficient of Nd:YAG at pump frequency 50 Hz with pump beam diameter 1.5 mm is 10.2 Wm, while the thermal lens coefficient of Nd:GSAG at pump frequency 50 Hz with pump beam diameter 1.75 mm is 5.9 Wm.

Original language	English
Article number	71940J
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7194
DOIs	https://doi.org/10.1117/12.822688
Publication status	Published - 2009
Externally published	Yes
Event	Laser Resonators and Beam Control XI - San Jose, CA, United States Duration: 26 Jan 2009 → 27 Jan 2009

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title = "Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm",

abstract = "Wavelength around 940 nm lasing can be obtained by quasi-three-level operation of Nd doped laser crystal. Diode end pumping provides the necessary high pump intensity in the laser crystal. In order to get high efficiency of the end pumped laser system, the overlap coefficient between pump beam and laser beam should be optimized. Thermal lens coefficient is one of the most important parameters to design the laser cavity structure. The time dependent heat conduction equation is solved numerically in order to study the thermal lens effect in pulsed pumping laser crystal. Calculated results showed that the thermal lens coefficients change with different pump frequencies. Experiments are done with Nd:YAG and Nd:GSAG laser rod. The thermal lens coefficient of Nd:YAG at pump frequency 50 Hz with pump beam diameter 1.5 mm is 10.2 Wm, while the thermal lens coefficient of Nd:GSAG at pump frequency 50 Hz with pump beam diameter 1.75 mm is 5.9 Wm.",

author = "Sha Wang and Xin Wang and T. Riesbeck and Eichler, {H. J.}",

year = "2009",

doi = "10.1117/12.822688",

language = "English",

volume = "7194",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

issn = "0277-786X",

publisher = "SPIE",

note = "Laser Resonators and Beam Control XI ; Conference date: 26-01-2009 Through 27-01-2009",

}

TY - JOUR

T1 - Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm

AU - Wang, Sha

AU - Wang, Xin

AU - Riesbeck, T.

AU - Eichler, H. J.

PY - 2009

Y1 - 2009

N2 - Wavelength around 940 nm lasing can be obtained by quasi-three-level operation of Nd doped laser crystal. Diode end pumping provides the necessary high pump intensity in the laser crystal. In order to get high efficiency of the end pumped laser system, the overlap coefficient between pump beam and laser beam should be optimized. Thermal lens coefficient is one of the most important parameters to design the laser cavity structure. The time dependent heat conduction equation is solved numerically in order to study the thermal lens effect in pulsed pumping laser crystal. Calculated results showed that the thermal lens coefficients change with different pump frequencies. Experiments are done with Nd:YAG and Nd:GSAG laser rod. The thermal lens coefficient of Nd:YAG at pump frequency 50 Hz with pump beam diameter 1.5 mm is 10.2 Wm, while the thermal lens coefficient of Nd:GSAG at pump frequency 50 Hz with pump beam diameter 1.75 mm is 5.9 Wm.

AB - Wavelength around 940 nm lasing can be obtained by quasi-three-level operation of Nd doped laser crystal. Diode end pumping provides the necessary high pump intensity in the laser crystal. In order to get high efficiency of the end pumped laser system, the overlap coefficient between pump beam and laser beam should be optimized. Thermal lens coefficient is one of the most important parameters to design the laser cavity structure. The time dependent heat conduction equation is solved numerically in order to study the thermal lens effect in pulsed pumping laser crystal. Calculated results showed that the thermal lens coefficients change with different pump frequencies. Experiments are done with Nd:YAG and Nd:GSAG laser rod. The thermal lens coefficient of Nd:YAG at pump frequency 50 Hz with pump beam diameter 1.5 mm is 10.2 Wm, while the thermal lens coefficient of Nd:GSAG at pump frequency 50 Hz with pump beam diameter 1.75 mm is 5.9 Wm.

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U2 - 10.1117/12.822688

DO - 10.1117/12.822688

M3 - Conference article

AN - SCOPUS:65649112074

SN - 0277-786X

VL - 7194

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

M1 - 71940J

T2 - Laser Resonators and Beam Control XI

Y2 - 26 January 2009 through 27 January 2009

ER -

Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm

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