Watt-Level Output Power Operation From Diode-Laser Pumped Circular Buried Depressed-Cladding Waveguides Inscribed in Nd:YAG by Direct Femtosecond-Laser Writing
Circular buried depressed-cladding waveguides have been inscribed in Nd:YAG ceramic media by direct writing with a femtosecond-laser beam. A classical step-by-step translation of the medium method, as well as a newly developed helical-moving technique, were employed to fabricate waveguides with 100-...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2016-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/7365419/ |
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| Summary: | Circular buried depressed-cladding waveguides have been inscribed in Nd:YAG ceramic media by direct writing with a femtosecond-laser beam. A classical step-by-step translation of the medium method, as well as a newly developed helical-moving technique, were employed to fabricate waveguides with 100- <inline-formula> <tex-math notation="LaTeX">$\mu\mbox{m}$</tex-math></inline-formula> diameter. Laser emission has been obtained under the pump with a fiber-coupled diode laser. Continuous-wave output power of 3.1 W at 1.06 <inline-formula> <tex-math notation="LaTeX">$\mu\mbox{m}$</tex-math></inline-formula> and 1.6 W at 1.3 <inline-formula> <tex-math notation="LaTeX">$\mu\mbox{m}$</tex-math></inline-formula> were achieved from a waveguide inscribed by helical movement in a 4.5-mm-long 1.1-at.% Nd:YAG; the overall optical-to-optical efficiency with respect to the absorbed pump power was 0.31 at 1.06 <inline-formula> <tex-math notation="LaTeX">$\mu\mbox{m}$</tex-math></inline-formula> and 0.17 at 1.3 <inline-formula> <tex-math notation="LaTeX">$\mu\mbox{m}$</tex-math></inline-formula>. Q-switch operation has been realized with Cr <sup>4+</sup>:YAG saturable absorber crystal. Using Cr <sup>4+</sup>:YAG with initial transmission of 0.90, an average output power of 680 mW has been measured from a waveguide that was written by the classical method in a 7.7-mm-long 1.1-at.% Nd:YAG ceramic. The laser pulse energy was 19.7 <inline-formula> <tex-math notation="LaTeX">$\mu\mbox{J}$</tex-math></inline-formula>, and the pulse peak power reached 7 kW. |
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| ISSN: | 1943-0655 |