公开(公告)号：DE69902421D1

公开(公告)日：2002-09-12

申请号：DE69902421

申请日：1999-05-12

Applicant: ANRITSU CORP

Inventor： MORI HIROSHI ,  KANAYA YASUHIRO ,  NAGASHIMA YASUAKI ,  KIKUGAWA TOMOYUKI ,  NAKANO YOSHINORI

IPC: H01S5/00 ,  B82Y20/00 ,  H01S5/227 ,  H01S5/30 ,  H01S5/32 ,  H01S5/343 ,  H01L33/00

Abstract: Disclosed is a semiconductor laser capable of preventing diffusion of a p-type dopant to an active layer while performing sufficient carrier blocking, even when Zn is used as a p-type dopant, and obtaining high emission efficiency and high output by minimizing light absorption in a p-type cladding layer. This semiconductor laser includes an active layer (3) and p-type cladding layer (5, 6, 7) on an n-type semiconductor substrate (1). The concentration distribution of a p-type dopant from the active layer (3) to the p-type cladding layer (5, 6, 7) has a maximum value at a distance of 50 to 250 nm from the end of the active layer (3).

公开(公告)号：AU3324900A

公开(公告)日：2000-10-16

申请号：AU3324900

申请日：2000-03-22

Applicant: JAPAN SCIENCE & TECH CORP ,  ANRITSU CORP

Inventor： UEHARA KIYOJI ,  YOSHIDA NAOHIRO ,  KIKUGAWA TOMOYUKI

IPC: G01N21/03 ,  G01N21/31 ,  G01N21/39 ,  G01N21/35

Abstract: An isotopomer absorption spectral analyzing apparatus and its method for precisely measuring the isotope ratio by substantially equalizing the absorption signal levels of different species of isotopes. In an isotopomer absorption spectral analyzing apparatus, a sample cell (21) capable of providing optical paths of different optical lengths is installed, optical beams A, B are caused to enter the sample cell (21) and travel along paths of different optical lengths, thereby determining the abundance ratio between species of isotopes in molecules from the ratio between intensities of signals corresponding to the species of isotopes.

公开(公告)号：EP1601028A4

公开(公告)日：2012-09-12

申请号：EP05703527

申请日：2005-01-13

Applicant: ANRITSU CORP

Inventor： YAMADA ATSUSHI ,  NAGASHIMA YASUAKI ,  SHIMOSE YOSHIHARU ,  KIKUGAWA TOMOYUKI

IPC: H01L33/00 ,  H01L33/02 ,  H01L33/24 ,  H01S5/10 ,  H01S5/14 ,  H01S5/16 ,  H01S5/20 ,  H01S5/22 ,  H01S5/227 ,  H01S5/30 ,  H01S5/343

CPC classification number: H01L33/02 ,  B82Y20/00 ,  H01L33/0045 ,  H01L33/24 ,  H01S5/101 ,  H01S5/1014 ,  H01S5/1085 ,  H01S5/141 ,  H01S5/16 ,  H01S5/2201 ,  H01S5/2206 ,  H01S5/2222 ,  H01S5/2226 ,  H01S5/227 ,  H01S5/2275 ,  H01S5/305 ,  H01S5/3213 ,  H01S5/3434 ,  H01S5/34373 ,  H01S2301/18 ,  H01S2304/04

公开(公告)号：EP1717918A4

公开(公告)日：2007-05-16

申请号：EP05710105

申请日：2005-02-10

Applicant: ANRITSU CORP

Inventor： MORI HIROSHI ,  KIKUGAWA TOMOYUKI ,  TAKAHASHI YOSHIO ,  SUZUKI TOSHIYUKI ,  KIMURA KIYOSHI

IPC: H01S5/227 ,  G01J3/433 ,  G01N21/39 ,  H01S20060101 ,  H01S5/024 ,  H01S5/062 ,  H01S5/0683 ,  H01S5/10 ,  H01S5/12

CPC classification number: H01S5/12 ,  G01J3/433 ,  G01N21/39 ,  H01S5/02415 ,  H01S5/0683 ,  H01S5/1039 ,  H01S5/227

Abstract: A variable-wavelength semiconductor laser comprises an n-type semiconductor substrate, an active layer disposed over the n-type semiconductor substrate and capable of generating light, a p-type clad layer disposed over the active layer, and wavelength selection means for selectively oscillating a specific wavelength of the light generated in the active layer. The variable-wavelength semiconductor laser oscillates at the specific wavelength when a current is injected into the active layer, and the specific wavelength can be varied by varying the magnitude of the current. The device length representing the length in the direction of the propagation of the generated light ranges from about 200 to 500 mum, and the width of the active layer representing the length perpendicular to the direction of the propagation of the light and parallel to the substrate ranges from about 1 to 2 mum. The p-type clad layer includes a low-concentration clad sub-layer having a low impurity concentration and a high-concentration clad sub-layer having a high impurity concentration sequentially formed in order from the active layer side.

公开(公告)号：JP2000275173A

公开(公告)日：2000-10-06

申请号：JP8489899

申请日：1999-03-26

Applicant: JAPAN SCIENCE & TECH CORP ,  ANRITSU CORP

Inventor： UEHARA KIYOJI ,  YOSHIDA NAOHIRO ,  KIKUGAWA TOMOYUKI

IPC: G01N21/03 ,  G01N21/31 ,  G01N21/39

Abstract: PROBLEM TO BE SOLVED: To provide an isotopomer absorption spectroscopic analysis instrument and method capable of performing the precise measurement of an isotope ratio by making an absorption signal level almost same with respect to different isotope species. SOLUTION: In the isotopomer absorption spectroscopic analysis instrument, a sample cell 21 capable of taking a plurality of light paths different in length is provided and a plurality of laser beams A, B are allowed to be incident on the sample cell 21 so as to advance on the light paths different in length to take different light path lengths and an isotope presence ratio in a molecule is measured from a ratio of absorption signal intensities. By this constitution, an absorption signal level is made almost same with respect to different isotope species and an isotope prescence ratio can be measured precisely.