Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality
GaAs-based, highly-efficient, kW-class, 1-cm laser bars with high peak power <italic>P</italic><sub>opt</sub> and improved beam quality in quasi-continuous-wave mode are presented. The use of an extreme-triple-asymmetric (ETAS) epitaxial layer structure diminishes power satur...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9757931/ |
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| author | Md. Jarez Miah Anisuzzaman Boni Seval Arslan Dominik Martin Pietro Della Casa Paul Crump |
| author_facet | Md. Jarez Miah Anisuzzaman Boni Seval Arslan Dominik Martin Pietro Della Casa Paul Crump |
| author_sort | Md. Jarez Miah |
| collection | DOAJ |
| description | GaAs-based, highly-efficient, kW-class, 1-cm laser bars with high peak power <italic>P</italic><sub>opt</sub> and improved beam quality in quasi-continuous-wave mode are presented. The use of an extreme-triple-asymmetric (ETAS) epitaxial layer structure diminishes power saturation of high-power bars at high driving current. The resulting ETAS bars with 4 mm cavity produce a record 1.9 kW peak power, limited by available current supply, with a maximum power conversion efficiency <italic>η</italic><sub>E</sub> = 67% at <italic>T</italic><sub>HS</sub> = 25 °C heat-sink temperature. Both <italic>P</italic><sub>opt</sub> and <italic>η</italic><sub>E</sub> have been increased further by operating the bars at <italic>T</italic><sub>HS</sub> = −70 °C. Sub-zero operation raises the <italic>P</italic><sub>opt</sub> to 2.3 kW and the maximum <italic>η</italic><sub>E</sub> to 74%. A second configuration of ETAS bars with optimized lateral layout is further realized to obtain narrow lateral beam divergence <italic>θ</italic> up to 2 kA driving current, without sacrificing <italic>P</italic><sub>opt</sub> and <italic>η</italic><sub>E</sub>. A 2–3° lower <italic>θ</italic> (95% power level) is observed over a wide operating range at room temperature. A high degree of polarization is also maintained across the whole operatingrange. |
| first_indexed | 2024-04-14T05:47:17Z |
| format | Article |
| id | doaj.art-05bf7204611842fdb1c332a869b9a754 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-04-14T05:47:17Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-05bf7204611842fdb1c332a869b9a7542022-12-22T02:09:14ZengIEEEIEEE Photonics Journal1943-06552022-01-011431510.1109/JPHOT.2022.31653999757931Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam QualityMd. Jarez Miah0https://orcid.org/0000-0002-9765-3088Anisuzzaman Boni1Seval Arslan2Dominik Martin3Pietro Della Casa4https://orcid.org/0000-0001-8393-4498Paul Crump5https://orcid.org/0000-0001-6723-8863Ferdinand-Braun-Institut, Berlin, GermanyFerdinand-Braun-Institut, Berlin, GermanyFerdinand-Braun-Institut, Berlin, GermanyFerdinand-Braun-Institut, Berlin, GermanyFerdinand-Braun-Institut, Berlin, GermanyFerdinand-Braun-Institut, Berlin, GermanyGaAs-based, highly-efficient, kW-class, 1-cm laser bars with high peak power <italic>P</italic><sub>opt</sub> and improved beam quality in quasi-continuous-wave mode are presented. The use of an extreme-triple-asymmetric (ETAS) epitaxial layer structure diminishes power saturation of high-power bars at high driving current. The resulting ETAS bars with 4 mm cavity produce a record 1.9 kW peak power, limited by available current supply, with a maximum power conversion efficiency <italic>η</italic><sub>E</sub> = 67% at <italic>T</italic><sub>HS</sub> = 25 °C heat-sink temperature. Both <italic>P</italic><sub>opt</sub> and <italic>η</italic><sub>E</sub> have been increased further by operating the bars at <italic>T</italic><sub>HS</sub> = −70 °C. Sub-zero operation raises the <italic>P</italic><sub>opt</sub> to 2.3 kW and the maximum <italic>η</italic><sub>E</sub> to 74%. A second configuration of ETAS bars with optimized lateral layout is further realized to obtain narrow lateral beam divergence <italic>θ</italic> up to 2 kA driving current, without sacrificing <italic>P</italic><sub>opt</sub> and <italic>η</italic><sub>E</sub>. A 2–3° lower <italic>θ</italic> (95% power level) is observed over a wide operating range at room temperature. A high degree of polarization is also maintained across the whole operatingrange.https://ieeexplore.ieee.org/document/9757931/Beam qualitybeam parameter productdiode lasershigh efficiencyhigh-power laserslaser bars |
| spellingShingle | Md. Jarez Miah Anisuzzaman Boni Seval Arslan Dominik Martin Pietro Della Casa Paul Crump Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality IEEE Photonics Journal Beam quality beam parameter product diode lasers high efficiency high-power lasers laser bars |
| title | Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality |
| title_full | Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality |
| title_fullStr | Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality |
| title_full_unstemmed | Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality |
| title_short | Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality |
| title_sort | optimizing vertical and lateral waveguides of kw class laser bars for higher peak power efficiency and lateral beam quality |
| topic | Beam quality beam parameter product diode lasers high efficiency high-power lasers laser bars |
| url | https://ieeexplore.ieee.org/document/9757931/ |
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