High efciency beam combination of 4.6-μm quantum cascade lasers

• 作 者: 吴昊 王利军 刘峰奇 彭航宇 张俊 佟存柱 宁永强 王立军
• 机 构: Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Institute of Se
• 出 处: Chinese Optics Letters
• 发表日期: 2013年09期
• 关键词: cascade powers heating mirrors lasing letter compress coated spots indium

The quantum cascade laser(QCL),a potential laser source for mid-infrared applications,has all of the advantages of a semiconductor laser,such as small volume and light weight,and is driven by electric power.However,the optical power of a single QCL is limited by serious self-heating efects.Therefore,beam combination technology is essential to achieve higher laser powers.In this letter,we demonstrate a simple beam combination scheme using two QCLs to extend the output peak power of the lasers to 2.3 W.A high beam combination efciency of 89% and beam quality factor of less than 5 are also achieved.

The quantum cascade laser (QCL), a potential laser source for mid-infrared applications, has all of the advantages of a semiconductor laser, such as small volume and light weight, and driven by electric power. However, the optical power of a single QCL is limited by serious self-heating efects.Therefore, beam combination technology is essential to achieve higher laser powers. This letter, we demonstrate a simple beam combination scheme using two QCLs to extend the output peak power of the lasers to 2.3 WA high beam combination efciency of 89% and beam quality factor of less than 5 are also achieved.