Location History:
- Tokyo, JP (1979)
- Hinodemachi, JP (1984 - 1986)
- Nishitama, JP (1986 - 1992)
Company Filing History:
Years Active: 1979-1992
Title: Yasutoshi Kashiwada: Innovator in Semiconductor Laser Technology
Introduction
Yasutoshi Kashiwada is a prominent inventor based in Nishitama, Japan. He has made significant contributions to the field of semiconductor laser technology, holding a total of 8 patents. His work focuses on enhancing the performance and stability of semiconductor lasers, which are crucial in various applications.
Latest Patents
Kashiwada's latest patents include a groundbreaking semiconductor laser that features a stripe-like lasing region. This innovative design differentiates the structure of the lasing region between the central portion and the areas near the facets. This differentiation aims to reduce optical feedback-induced noise and astigmatism, while also facilitating the manufacturing process. Another notable patent is the distributed-feedback semiconductor laser device. This device incorporates a grating that provides optical feedback through periodic corrugation within an optical resonator. The resonator consists of at least two regions with different Bragg wavelengths, arranged longitudinally along the optical axis. This design allows for stable single longitudinal mode oscillation by varying the refractive indexes of the regions nonuniformly around an average value.
Career Highlights
Yasutoshi Kashiwada is currently employed at Hitachi, Ltd., where he continues to push the boundaries of semiconductor laser technology. His work has been instrumental in advancing the capabilities of laser devices, making them more efficient and reliable.
Collaborations
Throughout his career, Kashiwada has collaborated with notable colleagues, including Naoki Chinone and Takashi Kajimura. These partnerships have fostered innovation and contributed to the development of cutting-edge technologies in the field.
Conclusion
Yasutoshi Kashiwada's contributions to semiconductor laser technology exemplify his dedication to innovation and excellence. His patents reflect a deep understanding of optical engineering and a commitment to improving laser performance.