Abstract
KDP and DKDP are unique materials for frequency conversion in large-aperture laser systems. Under high power irradiation, a threshold exists above which multiple damage sites are formed in the bulk of crystal plates thus obstructing beam propagation and creating undesirable beam modulations. Damage testing has focused on measuring the irradiation threshold fluences that lead to irreversible material modifications. However, small amounts of damage in optical components have been determined not to hinder system performance in large-aperture laser systems. In this work, we present a new approach to evaluating damage performance that provides statistics on damage pinpoint density, size and morphology as a function of fluence, wavelength and pulse duration and relates that to the resulting beam obscuration. We measure the size of damage sites for different wavelengths, pulse-lengths, and fluences. Different pulse-lengths are approximated by using multiple pulses appropriately delayed with respect to each other. We find that in KDP/DKDP crystals, the size of damage sites strongly depend on the pulse-length, with longer pulses creating larger damage sites. Also examined are ways of laser-annealing to increase the damage resistance.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Editors | K.L. Schepler, D.D. Lowenthal |
| Pages | 47-53 |
| Number of pages | 7 |
| Volume | 5337 |
| DOIs | |
| State | Published - 2004 |
| Externally published | Yes |
| Event | Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III - San Jose, CA, United States Duration: Jan 26 2004 → Jan 27 2004 |
Other
| Other | Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III |
|---|---|
| Country | United States |
| City | San Jose, CA |
| Period | 1/26/04 → 1/27/04 |
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Keywords
- Beam obscuration
- Damage testing
- Damage threshold
- KDP
- Laser conditioning
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
Cite this
Microscopic characterization of laser-induced damage performance of large-size KDP and DKDP nonlinear crystals. / DeMange, P.; Carr, C. W.; Radousky, H. B.; Demos, S. G.
Proceedings of SPIE - The International Society for Optical Engineering. ed. / K.L. Schepler; D.D. Lowenthal. Vol. 5337 2004. p. 47-53.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Microscopic characterization of laser-induced damage performance of large-size KDP and DKDP nonlinear crystals
AU - DeMange, P.
AU - Carr, C. W.
AU - Radousky, H. B.
AU - Demos, S. G.
PY - 2004
Y1 - 2004
N2 - KDP and DKDP are unique materials for frequency conversion in large-aperture laser systems. Under high power irradiation, a threshold exists above which multiple damage sites are formed in the bulk of crystal plates thus obstructing beam propagation and creating undesirable beam modulations. Damage testing has focused on measuring the irradiation threshold fluences that lead to irreversible material modifications. However, small amounts of damage in optical components have been determined not to hinder system performance in large-aperture laser systems. In this work, we present a new approach to evaluating damage performance that provides statistics on damage pinpoint density, size and morphology as a function of fluence, wavelength and pulse duration and relates that to the resulting beam obscuration. We measure the size of damage sites for different wavelengths, pulse-lengths, and fluences. Different pulse-lengths are approximated by using multiple pulses appropriately delayed with respect to each other. We find that in KDP/DKDP crystals, the size of damage sites strongly depend on the pulse-length, with longer pulses creating larger damage sites. Also examined are ways of laser-annealing to increase the damage resistance.
AB - KDP and DKDP are unique materials for frequency conversion in large-aperture laser systems. Under high power irradiation, a threshold exists above which multiple damage sites are formed in the bulk of crystal plates thus obstructing beam propagation and creating undesirable beam modulations. Damage testing has focused on measuring the irradiation threshold fluences that lead to irreversible material modifications. However, small amounts of damage in optical components have been determined not to hinder system performance in large-aperture laser systems. In this work, we present a new approach to evaluating damage performance that provides statistics on damage pinpoint density, size and morphology as a function of fluence, wavelength and pulse duration and relates that to the resulting beam obscuration. We measure the size of damage sites for different wavelengths, pulse-lengths, and fluences. Different pulse-lengths are approximated by using multiple pulses appropriately delayed with respect to each other. We find that in KDP/DKDP crystals, the size of damage sites strongly depend on the pulse-length, with longer pulses creating larger damage sites. Also examined are ways of laser-annealing to increase the damage resistance.
KW - Beam obscuration
KW - Damage testing
KW - Damage threshold
KW - KDP
KW - Laser conditioning
UR - http://www.scopus.com/inward/record.url?scp=3543079855&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=3543079855&partnerID=8YFLogxK
U2 - 10.1117/12.531330
DO - 10.1117/12.531330
M3 - Conference contribution
VL - 5337
SP - 47
EP - 53
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Schepler, K.L.
A2 - Lowenthal, D.D.
ER -