High-power long-pulse second harmonic generation and optical damage with free-running Nd: YAG laser

被引：17

作者：

Favre, S ^{[1
]}

Sidler, TC ^{[1
]}

Salathé, RP ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, EPFL, Inst Imaging & Appl Opt, CH-1015 Lausanne, Switzerland

来源：

IEEE JOURNAL OF QUANTUM ELECTRONICS | 2003年 / 39卷 / 06期

关键词：

free running; gray tracks; KTP; laser; optical damage; second-harmonic generation (SHG);

D O I：

10.1109/JQE.2003.810764

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Frequency doubling with a free-running long-pulse Nd:YAG laser and LBO or KTP nonlinear crystals yields conversion efficiency of up to 17.5% and 162 W peak power in the second harmonic. This efficiency is obtained for a TEM00 beam with rectangular temporal pulse shape of 50 to 400 mus. To our knowledge, this is the highest second-harmonic generation (SHG) efficiency reported for the long-pulse free-running configuration. The efficiency is limited by optical damage with much lower threshold than in the Q-switch domain. The damage is preceded by a saturation effect of the SHG efficiency. Both wavelengths (fundamental and second-harmonic) are necessary for the creation of the catastrophic damage. We present first evidence for a mechanism that involves creation of transient absorption centers by the second-harmonic radiation due to multiphoton absorption. Absorption of the fundamental wave at these centers leads to local heating and ultimately catastrophic damage.

引用

页码：733 / 740

页数：8

共 19 条

[1] STUDY OF KTIOPO4 GRAY-TRACKING AT 1064-NM, 32-NM, AND 355-NM [J].

BOULANGER, B ;

FEJER, MM ;

BLACHMAN, R ;

BORDUI, PF .

APPLIED PHYSICS LETTERS, 1994, 65 (19) :2401-2403

[2] Optical studies of laser-induced gray-tracking in KTP [J].

Boulanger, B ;

Rousseau, I ;

Fève, JP ;

Maglione, M ;

Ménaert, B ;

Marnier, G .

IEEE JOURNAL OF QUANTUM ELECTRONICS, 1999, 35 (03) :281-286

[3] Gray-track damage in potassium titanyl phosphate under a picosecond regime at 532 nm [J].

Carrion, L ;

Girardeau-Montaut, JP .

APPLIED PHYSICS LETTERS, 2000, 77 (08) :1074-1076

[4] EFFICIENT 2ND-HARMONIC GENERATION IN KTP CRYSTALS [J].

DRISCOLL, TA ;

HOFFMAN, HJ ;

STONE, RE ;

PERKINS, PE .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1986, 3 (05) :683-686

[5] High power second harmonic generation with free running Nd:YAG slab laser for micro-machining applications. [J].

Favre, S ;

Sidler, T ;

Salathé, RP .

1ST INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION, 2000, 4088 :195-198

[6] Repetition rate dependence of gray-tracking in KTiOPO4 during second-harmonic generation at 532 nm [J].

Feve, JP ;

Boulanger, B ;

Marnier, G ;

Albrecht, H .

APPLIED PHYSICS LETTERS, 1997, 70 (03) :277-279

[7] Singly resonant cavity-enhanced frequency tripling [J].

Koch, K ;

Moore, GT .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1999, 16 (03) :448-459

[8]

KOECHNER W, 1996, SOLID STATE LASER EN, P582

[9] Laser-induced bulk damage in various types of vitreous silica at 1064, 532, 355, and 266 nm: evidence of different damage mechanisms between 266-nm and longer wavelengths [J].

Kuzuu, N ;

Yoshida, K ;

Yoshida, H ;

Kamimura, T ;

Kamisugi, N .

APPLIED OPTICS, 1999, 38 (12) :2510-2515

[10] Laser ablation and micromachining with ultrashort laser pulses [J].

Liu, X ;

Du, D ;

Mourou, G .

IEEE JOURNAL OF QUANTUM ELECTRONICS, 1997, 33 (10) :1706-1716

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