Single frequency Blue-Green Laser Diode in External Cavity

Hsiang-Chen Chui^1,2*

¹Optoelectronic Engineering, Dalian University of Technology, Dalian, China
²Photonics, National Cheng Kung University, Tainan, Taiwan

* Presenter:Hsiang-Chen Chui, email:hcchui@dlut.edu.cn

Single longitudinal mode lasers within a blue-green region have potential applications in frequency references, optical heterodyne detection, high-resolution spectroscopy, medical treatment, and lidar. Laser diodes operated at 400-520 nm were selected and analyzed for designing robust and compact laser sources. In our works, an external cavity diode laser (ECDL) system in Littrow layout was designed and assembled. Then, a volume Bragg grating mirror was also employed as an external cavity. A >100 mW laser output can be achieved using injection locking and was investigated. Molecular iodine (I2) and tellurium (Te2) have a dense grid of lines spread over a wide range of the visible region. The iodine molecular hyperfine spectrum serves as a reference from 500 nm to about 900 nm whereas the absorption spectrum of tellurium molecule spans from 415 to 540 nm. The high-stability frequency references within the blue-green region can be achieved with an ECDL were reported.

Keywords: laser diode, single frequency, frequency references, external cavity diode laser