Title:
LASER MODULE, AND CONTROL METHOD AND CONTROL DEVICE FOR LASER MODULE
Document Type and Number:
WIPO Patent Application WO/2023/228268
Kind Code:
A1
Abstract:
This laser module (1) comprises a semiconductor laser (11) that oscillates using one circularly polarized light among right circularly polarized light and left circularly polarized light, and a quarter wavelength plate (15) that is disposed on the emission surface side of the semiconductor laser, wherein the semiconductor laser is driven by current that is higher than the threshold current of the one circularly polarized light and is lower than the threshold current of the other circularly polarized light. The semiconductor laser is provided with an n-type cladding layer, an active layer, and a p-type cladding layer. The semiconductor laser is further provided with an n-type electrode and a p-type electrode, and at least one among the n-type electrode and the p-type electrode is a ferromagnet electrode. As a result, the present invention can provide a low-cost laser module that is capable of limiting the impact of optical feedback.
Inventors:
ARAI HAYATO (JP)
KOBAYASHI WATARU (JP)
MITSUHARA MANABU (JP)
KOBAYASHI WATARU (JP)
MITSUHARA MANABU (JP)
Application Number:
PCT/JP2022/021213
Publication Date:
November 30, 2023
Filing Date:
May 24, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H01S5/02255
Domestic Patent References:
| WO2014136607A1 | 2014-09-12 |
Foreign References:
| JP2003224333A | 2003-08-08 | |||
| US20010036212A1 | 2001-11-01 |
Attorney, Agent or Firm:
YAMAKAWA, Shigeki et al. (JP)
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