Masashi Fujino

University of Electro-Communications

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K. Hakuta

University of Electro-Communications

Kunihiko Nakayama

Toshiba (Japan)

Hiroshi Takuma

University of Tsukuba

Kosuke Tsukada

Keio University

Sho Amano

University of Hyogo

Takayasu Mochizuki

University of Hyogo

Kazuki Shibusawa

Keio University

Seiichi Yokoyama

Integrated Device Technology (United States)

S. Amano

Kitasato University

Cooperative Institutions

Japan Atomic Energy Agency

Hoya (Japan)

University of Electro-Communications

Keio University

University of Hyogo

Osaka University

Konan University

Himeji University

Institute for Laser Technology

Japan Science and Technology Agency

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FORMATION OF KrF EXCIMER BY TWO PHOTON PROCESS IN KF/F2 MIXTURES

International Quantum Electronics Conference (1988)

K. Hakuta Kunihiko Nakayama Masashi Fujino Hiroshi Takuma

Since the suggestions of Gudzenko and Yakovienko,l intensive studies for photo-assisted collisions have been carried out experimentally and theoretically for various collision schemes. Previously, we have reported the formations2 of KrF excimer through photo-assisted collision between Kr and F atoms, and also its applications3 to the kinetics of KrF excimer. In the present paper, we report on a new formation process of KrF excimer induced by 248-nm photon in the laser intensity region higher than the previous works.

Excimer

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Formation of KrF Excimer Using a Laser-Induced Harpooning Reaction through Two-Photon Pumping

Japanese Journal of Applied Physics (1990)

K. Hakuta Kunihiko Nakayama Masashi Fujino Hiroshi Takuma

A new formation process of the KrF excimer by irradiating the Kr/F 2 gas mix with KrF laser beam is reported. The formation process is assigned as a laser-induced harpooning reaction through two-photon pumping. This process has made it possible to prepare KrF excimers in highly excited vibrational states under simple and control lable conditions, and has enabled the quantitative investigation of the vibrational relaxation processes of the KrF excimer.

Excimer

Vibrational energy relaxation

Two-photon excitation microscopy

10.1143/jjap.29.l1019

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Lifetime Measurements for KrF Excimer Using Photoassociative Pumping

Japanese Journal of Applied Physics (1990)

K. Hakuta Masashi Fujino Kunihiko Nakayama Hiroshi Takuma

Various kinetic parameters of the KrF excimer generated by the use of photoassociative pumping have been measured under simple and controllable conditions. The population transfer rate coefficient between the B 2 Σ + and C 2 Π states has been directly determined to be (1.2±0.3)×10 -10 cm 3 /s for Kr buffer gas. The radiative lifetime of the C 2 Π state and the quenching rate coefficients for F 2 and Kr gases are also given as 60±10 ns, (2.5±1)×10 -10 cm 3 /s, and (7±3)×10 -12 cm 3 /s, respectively.

Excimer

10.1143/jjap.29.1194

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High sensitivity of surface-enhanced Raman scattering using an Ag nanoparticles substrate and Au coated magnetic nanoparticles controlled via a magnetic field

The Japan Society of Applied Physics (2019)

Masashi Fujino Kazuki Shibusawa Kosuke Tsukada

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Diode pumped RGB visible solid-state lasers.

The Review of Laser Engineering (1990)

Sho Amano Seiichi Yokoyama Masashi Fujino S. Amano Takayasu Mochizuki

We have developed green, blue, and red solid state lasers by diode laser pumping. A green laseroutputs up to 22 mW at 531 nm with an NYAB crystal, and a blue one up to 7 mW at 473 nmwith Nd: YAG/KNbO3 crystals. These visible lasers are efficient, compact, and reliable comparedwith flashlamp-pumped lasers or gas lasers. Many applications with these lasers arepresented.

Blue laser

Ti:sapphire laser

10.2184/lsj.18.8_634

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Photoassociation of KrF Excimer at 248 nm

Japanese Journal of Applied Physics (1988)

K. Hakuta Kunihiko Nakayama Masashi Fujino Hiroshi Takuma

KrF excimers are produced by irradiating the gas mix of Kr and F 2 with KrF laser radiation at 248 nm. The excitation process is identified as a photoassociation process between colliding Kr and F atoms via photodissociation of F 2 molecules. The present success has made it possible to investigate the collisional processes of KrF excimer quantitatively.

Excimer

10.1143/jjap.27.l1989

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Photoassociation of KrF Excimer at 248 nm : Atoms and Molecules

Japanese Journal of Applied Physics (1988)

K. Hakuta Kunihiko Nakayama Masashi Fujino Hiroshi Takuma

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