Tetsuya Baba - Academia.edu (original) (raw)

Papers by Tetsuya Baba

Research paper thumbnail of Improvement of Laser Beam Profile Using Optical Fiber for Laser Pulse Thermal Diffusivity Measurements

Thermal Conductivity 20, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal diffusivity measurements of transparent liquid and powder materials using PAS

Proceedings of the 10th international conference on photoacoustic and photothermal phenomena, 1999

Thermal diffusivity of organic dye CV in powder form has been measured using PA effect. It is sho... more Thermal diffusivity of organic dye CV in powder form has been measured using PA effect. It is shown that this method permits to estimate the thermal diffusivity for transparent solvents using the dye at low concentration as a precursor.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal Diffusivity Measurements of Metal Thin Films by Means of the Picosecond Thermoreflectance Technique

Key Engineering Materials, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 熱拡散率標準物質の開発に関する研究

Netsu Bussei, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of パイロセラム９６０６の熱拡散率

Netsu Bussei, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of System Construction of a Thermal Conductivity Database for Solid Materials

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal Diffusivity of Carbon Materials as Candidate Reference Materials

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Relationship between thermal diffusivity and microscopic structure in graphitic carbon I: mesophase carbon

Bookmarks Related papers MentionsView impact

Research paper thumbnail of サーモリフレクタンス法によるＴｉＮｘ薄膜の熱拡散率の測定

Journal of the Vacuum Society of Japan, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis of the operational error of heat flux transducers placed on wall surfaces

Review of Scientific Instruments, 1985

Analysis of the operational error of heat flux transducers placed on wall Tetsuya Baba, Akira Ono... more Analysis of the operational error of heat flux transducers placed on wall Tetsuya Baba, Akira Ono, and Susumu Hattori National Research Laboratory of Metrology, Sakura-mura, Niihari-gun, Ibaraki 305, Japan (Received 8 August 1984; accepted for ... (А5) S t~Jo \Jo q where AT 0 ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Laser beam profile measurement by a thermographic technique

Review of Scientific Instruments, 1986

beam profile measurement by a thermographic Tetsuya Baba, Temo Arai, and Akira Ono National Resea... more beam profile measurement by a thermographic Tetsuya Baba, Temo Arai, and Akira Ono National Research Laboratory of Metrology, Sakura-mura, Niihari-gun ... The receiving film was a stainless-steel foil both surfaces of which were coated by spraying with a black paint, dry ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal diffusivity measurement of a thin metal film with a picosecond thermoreflectance technique

High Temperatures - High Pressures, 2002

ABSTRACT A picosecond thermoreflectance measurement system in the National Research Laboratory of... more ABSTRACT A picosecond thermoreflectance measurement system in the National Research Laboratory of Metrology has been improved by introducing a 'rear heating/front probing' configuration. Both rear heating/front probing and conventional front heating/front probing thermoreflectance signals can be observed for thin films deposited on transparent substrates. The analytical solution of the temperature response is presented. It considers the penetration depth of a heating beam and a probe beam, and is derived based on the response function method. These analyses were applied to an aluminium thin film, nominally 100 nm thick, deposited on a Pyrex 7740 glass substrate. The thermal diffusivity calculated from the front heating/front probing thermoreflectance signal is 30% smaller than that of the bulk aluminium. The thermal diffusivity calculated from the rear heating/front probing thermoreflectance signal is 6.2% smaller than that of the bulk aluminium.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Evaluation of the Effective Sample Temperature in Thermal Diffusivity Measurements Using the Laser Flash Method

International Journal of Thermophysics, 2002

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrical delay technique in the picosecond thermoreflectance method for thermophysical property measurements of thin films

Review of Scientific Instruments, 2005

A new picosecond thermoreflectance measurement system using an electrical delay control has been ... more A new picosecond thermoreflectance measurement system using an electrical delay control has been developed in order to extend observation time of temperature response of thin films after pulse heating. The new system uses two picosecond titanium sapphire lasers, one for heating a specimen and the other for probing temperature change on the film surface. Temperature history of the film surface is observed by changing the delay time of the probe pulse from the pump pulse electrically instead of changing the difference of path length between the pump beam and the probe beam. It is not difficult to observe temperature history over longer time than the repetition period of the picosecond laser pulses using the electrical delay technique. The electrical delay technique can get rid of the fluctuation of focused position of the beam on the specimen surface which is hard to eliminate after traveling through the optical delay line of variable path length. Temperature history curves of sputtered tungsten thin films of 140, 200, and 300 nm thick on glass substrates have been observed much longer than the repetition period of picosecond laser pulses for the first time. An analytical model is proposed to explain temperature response after repetitive picosecond laser pulses considering heat diffusion across the thin film, heat diffusion parallel to the film face, and heat effusion into substrate. Based on this model, thermal diffusivity values of the tungsten thin films calculated from the observed temperature history curves are about 40% of that of bulk tungsten. This electrical delay technique can realize thermophysical property measurements of a wide variety of thin films such as thicker metal films, nonmetal thin films, low thermal diffusivity materials, and multilayered thin films, the heat diffusion time of which could not be covered by the optical delay technique.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermophysical properties of aluminum oxide and molybdenum layered films

Thin Solid Films, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Homodyne detection technique using spontaneously generated reference signal in picosecond thermoreflectance measurements

Review of Scientific Instruments, 2003

... Tetsuya Baba, Emmanuel Schaub, Akira Ono. Abstract. A new detection technique for picosecond ... more ... Tetsuya Baba, Emmanuel Schaub, Akira Ono. Abstract. A new detection technique for picosecond thermoreflectance measurements has been developed. Conventional picosecond thermoreflectance measurements detect the signal amplitude of a reflected probe laser beam ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Development of a thermal diffusivity measurement system for metal thin films using a picosecond thermoreflectance technique

Measurement Science and Technology, 2001

A picosecond thermoreflectance measurement system has been developed in the National Metrology In... more A picosecond thermoreflectance measurement system has been developed in the National Metrology Institute of Japan in order to measure thermal diffusivities of metal thin films. A laser beam from a picosecond Ti-sapphire laser is focused onto the surface of a metal thin film with a spot size of 100 µm and absorbed within the skin depth of the order of

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improvement of the laser flash method to reduce uncertainty in thermal diffusivity measurements

Measurement Science and Technology, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Traceable measurements and data of thermophysical properties for solid materials: a review

Measurement Science and Technology, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis on thermal properties of tin doped indium oxide films by picosecond thermoreflectance measurement

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improvement of Laser Beam Profile Using Optical Fiber for Laser Pulse Thermal Diffusivity Measurements

Thermal Conductivity 20, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal diffusivity measurements of transparent liquid and powder materials using PAS

Proceedings of the 10th international conference on photoacoustic and photothermal phenomena, 1999

Thermal diffusivity of organic dye CV in powder form has been measured using PA effect. It is sho... more Thermal diffusivity of organic dye CV in powder form has been measured using PA effect. It is shown that this method permits to estimate the thermal diffusivity for transparent solvents using the dye at low concentration as a precursor.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal Diffusivity Measurements of Metal Thin Films by Means of the Picosecond Thermoreflectance Technique

Key Engineering Materials, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 熱拡散率標準物質の開発に関する研究

Netsu Bussei, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of パイロセラム９６０６の熱拡散率

Netsu Bussei, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of System Construction of a Thermal Conductivity Database for Solid Materials

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal Diffusivity of Carbon Materials as Candidate Reference Materials

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Relationship between thermal diffusivity and microscopic structure in graphitic carbon I: mesophase carbon

Bookmarks Related papers MentionsView impact

Research paper thumbnail of サーモリフレクタンス法によるＴｉＮｘ薄膜の熱拡散率の測定

Journal of the Vacuum Society of Japan, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis of the operational error of heat flux transducers placed on wall surfaces

Review of Scientific Instruments, 1985

Analysis of the operational error of heat flux transducers placed on wall Tetsuya Baba, Akira Ono... more Analysis of the operational error of heat flux transducers placed on wall Tetsuya Baba, Akira Ono, and Susumu Hattori National Research Laboratory of Metrology, Sakura-mura, Niihari-gun, Ibaraki 305, Japan (Received 8 August 1984; accepted for ... (А5) S t~Jo \Jo q where AT 0 ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Laser beam profile measurement by a thermographic technique

Review of Scientific Instruments, 1986

beam profile measurement by a thermographic Tetsuya Baba, Temo Arai, and Akira Ono National Resea... more beam profile measurement by a thermographic Tetsuya Baba, Temo Arai, and Akira Ono National Research Laboratory of Metrology, Sakura-mura, Niihari-gun ... The receiving film was a stainless-steel foil both surfaces of which were coated by spraying with a black paint, dry ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermal diffusivity measurement of a thin metal film with a picosecond thermoreflectance technique

High Temperatures - High Pressures, 2002

ABSTRACT A picosecond thermoreflectance measurement system in the National Research Laboratory of... more ABSTRACT A picosecond thermoreflectance measurement system in the National Research Laboratory of Metrology has been improved by introducing a 'rear heating/front probing' configuration. Both rear heating/front probing and conventional front heating/front probing thermoreflectance signals can be observed for thin films deposited on transparent substrates. The analytical solution of the temperature response is presented. It considers the penetration depth of a heating beam and a probe beam, and is derived based on the response function method. These analyses were applied to an aluminium thin film, nominally 100 nm thick, deposited on a Pyrex 7740 glass substrate. The thermal diffusivity calculated from the front heating/front probing thermoreflectance signal is 30% smaller than that of the bulk aluminium. The thermal diffusivity calculated from the rear heating/front probing thermoreflectance signal is 6.2% smaller than that of the bulk aluminium.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Evaluation of the Effective Sample Temperature in Thermal Diffusivity Measurements Using the Laser Flash Method

International Journal of Thermophysics, 2002

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrical delay technique in the picosecond thermoreflectance method for thermophysical property measurements of thin films

Review of Scientific Instruments, 2005

A new picosecond thermoreflectance measurement system using an electrical delay control has been ... more A new picosecond thermoreflectance measurement system using an electrical delay control has been developed in order to extend observation time of temperature response of thin films after pulse heating. The new system uses two picosecond titanium sapphire lasers, one for heating a specimen and the other for probing temperature change on the film surface. Temperature history of the film surface is observed by changing the delay time of the probe pulse from the pump pulse electrically instead of changing the difference of path length between the pump beam and the probe beam. It is not difficult to observe temperature history over longer time than the repetition period of the picosecond laser pulses using the electrical delay technique. The electrical delay technique can get rid of the fluctuation of focused position of the beam on the specimen surface which is hard to eliminate after traveling through the optical delay line of variable path length. Temperature history curves of sputtered tungsten thin films of 140, 200, and 300 nm thick on glass substrates have been observed much longer than the repetition period of picosecond laser pulses for the first time. An analytical model is proposed to explain temperature response after repetitive picosecond laser pulses considering heat diffusion across the thin film, heat diffusion parallel to the film face, and heat effusion into substrate. Based on this model, thermal diffusivity values of the tungsten thin films calculated from the observed temperature history curves are about 40% of that of bulk tungsten. This electrical delay technique can realize thermophysical property measurements of a wide variety of thin films such as thicker metal films, nonmetal thin films, low thermal diffusivity materials, and multilayered thin films, the heat diffusion time of which could not be covered by the optical delay technique.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermophysical properties of aluminum oxide and molybdenum layered films

Thin Solid Films, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Homodyne detection technique using spontaneously generated reference signal in picosecond thermoreflectance measurements

Review of Scientific Instruments, 2003

... Tetsuya Baba, Emmanuel Schaub, Akira Ono. Abstract. A new detection technique for picosecond ... more ... Tetsuya Baba, Emmanuel Schaub, Akira Ono. Abstract. A new detection technique for picosecond thermoreflectance measurements has been developed. Conventional picosecond thermoreflectance measurements detect the signal amplitude of a reflected probe laser beam ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Development of a thermal diffusivity measurement system for metal thin films using a picosecond thermoreflectance technique

Measurement Science and Technology, 2001

A picosecond thermoreflectance measurement system has been developed in the National Metrology In... more A picosecond thermoreflectance measurement system has been developed in the National Metrology Institute of Japan in order to measure thermal diffusivities of metal thin films. A laser beam from a picosecond Ti-sapphire laser is focused onto the surface of a metal thin film with a spot size of 100 µm and absorbed within the skin depth of the order of

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improvement of the laser flash method to reduce uncertainty in thermal diffusivity measurements

Measurement Science and Technology, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Traceable measurements and data of thermophysical properties for solid materials: a review

Measurement Science and Technology, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis on thermal properties of tin doped indium oxide films by picosecond thermoreflectance measurement

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2005

Bookmarks Related papers MentionsView impact