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R5509-42

PHOTOMULTIPLIER TUBES

Hamamatsu Photonics 

Measurement of Raman spectroscopy

Sample 9

Rhodamine B in Ethanol Solution

(2 × 10-2 mol/L)

SAMPLE TEMPERATURE

300K

( ) room

temperature

Raman spectroscopy is effective in

studying the structure of molecules in a

solution. In particular, near infrared Ra-

man spectroscopy enables measure-

ment of samples which were previously

impossible with conventional methods

using visible light excitation because of

the influence of fluorescence. In this ap-

plication, clear Raman spectra of solute

rhodamine B (marked by M) are meas-

ured, as well as a Raman spectrum of

ethanol solution. This data was obtained

with weak excitation light averaging 10

mW output using pulsed excitation light

and gate detection method under fluor-

escent room lighting conditions.

EXCITATION LIGHT: LD-PUMPED

ND: YAG (1064 nm)

10 mW, 10 ns pulse, 10 kHz

SAMPLE TEMPERATURE: 77 K

RHODAMINE B POWDER

SAMPLE

ETHANOL

1600

1400 1200 1000

800

RAMAN SHIFT (cm-1)

TPMHB0452EB

Cathodoluminescence (CL) measurement

Sample 10

InAs/InP

SAMPLE TEMPERATURE

10K

R5509-42

The data on the right show images of

cathodoluminescence (CL) emitted from

InAs islands in an InAs/InP multiple

quantum well structure, observed with a

scanning electron microscope (SEM) to

which a light collection system and a

monochromator were installed. The right-

hand CL images were taken with the

SEM using a Ge PIN photodiode. These

images are not clear due to external

noise such as cosmic rays. In contrast,

the left-hand data taken with an R5509-

42 photomultiplier tube shows clear,

sharp CL images with a high S/N ratio.

The R5509-42 allows high-sensitivity CL

measurements in the near infrared re-

gion, which are expected to prove useful

in optical evaluations of samples, analy-

sis of inorganic or organic substances,

and other near infrared spectroscopy.

990nm

1010nm

Ge PIN-PD

77K

990nm

1020nm

Cathodoluminescence (CL) Measurement

When a sample is irradiated by high-veloc-

ity electron beams, electron-hole pairs in

the sample are excited and then recom-

bine while producing a characteristic lumi-

nescence known as cathodoluminescence

(CL). Information on the internal electron

structures of the sample can be studied by

measuring this luminescence.

1030nm

1040nm

Condition

Electron Accelerating Voltage

Probe Current

5 kV

10 nA

Photos: By courtesy of Prof. Y. Takeda, Dept. of Materials Science and Engineering, Graduate

School of Engineering, Nagoya University;

Prof. A. Nakamura, Center for Integrated Research in Science and Engineering, Nagoya

University

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