Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Kenichi HIROSAWA"'
Publikováno v:
Applied Physics Express, Vol 17, Iss 4, p 042005 (2024)
We demonstrate a master oscillator power amplifier system that emits single-frequency, high-energy optical pulses at 1539 nm using an Er, Yb:glass planar waveguide amplifier with a normalized frequency of the waveguide of 4.4. A maximum pulse energy
Externí odkaz:
https://doaj.org/article/ff3a086cac8042bd96e34116679c2bc4
Autor:
Junia Nomura, Kenichi Hirosawa, Takayuki Yanagisawa, Nobuo Ohata, Shunsuke Imamura, Daisuke Sakaizawa, Naoya Tomii
Publikováno v:
Optics Letters. 48:1758
We demonstrate a master oscillator power amplifier (MOPA) system that emits single-frequency high-energy optical pulses at 1540 nm using an Er,Yb:glass planar waveguide amplifier and a large mode area Er-doped fiber amplifier. A double under-cladding
Autor:
Hisamichi Tanaka, Toshiyuki Ando, Masahiro Hagio, Takeshi Sakimura, Hamaki Inokuchi, Shumpei Kameyama, Yoshihito Hirano, Yojiro Watanabe, Masashi Furuta, Takayuki Yanagisawa, Kimio Asaka, Kenichi Hirosawa
Publikováno v:
Optics express. 27(17)
形態: カラー図版あり
Physical characteristics: Original contains color illustrations
Accepted: 2019-07-21
資料番号: PA2020032000
Physical characteristics: Original contains color illustrations
Accepted: 2019-07-21
資料番号: PA2020032000
Autor:
Takayuki Yanagisawa, Shumpei Kameyama, Kenichi Hirosawa, Narito Samejima, Kenichi Uto, Takeshi Sakimura
Publikováno v:
Laser Congress 2019 (ASSL, LAC, LS&C).
We have demonstrated high-energy amplification of sub-nanosecond laser pulses with an Er,Yb:glass planar waveguide amplifier. The output pulse energy reached 500 μJ at 20 kHz repetition rate, 500 ps duration, and 1534 nm wavelength.
Autor:
Tsukasa Yoshida, Yoshihiro Nakaya, Kenichi Hirosawa, Takahiro Ito, Keisuke Takiguchi, Atsushi Urikura
Publikováno v:
Japanese Journal of Radiological Technology. 72:1137-1143
Objective The purpose of this study was to assess the dose reduction and the image quality using bismuth sheets during the computed tomography fluoroscopy (CTF). Materials and methods The bismuth sheets of 1-mm thick were put on the upper mylar ring
Publikováno v:
Optics Express. 28:27078
The 1.53-µm coherent differential absorption lidar (DIAL) is demonstrated for the simultaneous profiling of water vapor (H2O) density and wind speed. The optical setup is fiber-based. The wavelength locking circuit can achieve precise locking of 13.
Publikováno v:
Applied Optics. 59:2667
This publisher’s note amends the title in Appl. Opt. 59, 2238 (2020).APOPAI0003-693510.1364/AO.384675
Publikováno v:
Applied Optics. 59:2238
A feasibility study of coherent differential absorption lidar is conducted using a 1.53-µm wavelength for simultaneously retrieving the water vapor density and wind speed profiles. We selected the ON and OFF wavelengths to be 1531.383 and 1531.555 n
Autor:
Masaharu IMAKI, Takeshi SAKIMURA, Kenichi HIROSAWA, Hisamichi TANAKA, Takayuki YANAGISAWA, Toshiyuki ANDO, Shumpei KAMEYAMA
Publikováno v:
The Review of Laser Engineering. 48:591
Publikováno v:
Laser Congress 2018 (ASSL).
We developed a small-sized Er,Yb:glass planar waveguide laser amplifier pumped by a laser diode bar with the butt joint configuration, toward the application of the wind sensing coherent lidar (light detection and ranging). We demonstrate the signal