Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices
A possibility of an application of the femtosecond Ti-Sa lasers for a measuring of the amplitude-frequency characteristics (AFC) of the wide-band photodevices is considered. The results of the measuring of the AFC in a frequency range 1.5 GHz for a high-speed photodiode S5972 of the firm “Hamamatsu”...
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| Опубліковано в: : | Вопросы атомной науки и техники |
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| Дата: | 2013 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2013
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices / A.V. Vasilyev, V.P. Zajtsev, V.P. Leshchenko, A.I. Povrozin // Вопросы атомной науки и техники. — 2013. — № 6. — С. 244-245. — Бібліогр.: 3 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859646498349776896 |
|---|---|
| author | Vasilyev, A.V. Zajtsev, V.P. Leshchenko, V.P. Povrozin, A.I. |
| author_facet | Vasilyev, A.V. Zajtsev, V.P. Leshchenko, V.P. Povrozin, A.I. |
| citation_txt | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices / A.V. Vasilyev, V.P. Zajtsev, V.P. Leshchenko, A.I. Povrozin // Вопросы атомной науки и техники. — 2013. — № 6. — С. 244-245. — Бібліогр.: 3 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | A possibility of an application of the femtosecond Ti-Sa lasers for a measuring of the amplitude-frequency characteristics (AFC) of the wide-band photodevices is considered. The results of the measuring of the AFC in a frequency range 1.5 GHz for a high-speed photodiode S5972 of the firm “Hamamatsu” are presented.
Розглянуто можливість застосування фемтосекундних Ti-Sa-лазерів для вимірювання амплітудно-частотних характеристик (АЧХ) фотоприймачів з широким діапазоном приймання. Наведено результати вимірювання АЧХ у межах 1,5 ГГц для високошвидкісного фотодіода S5972 фірми “Hamamatsu”.
Рассмотрена возможность применения фемтосекундных TI-Sa-лазеров для измерения амплитудно-частотных характеристик (АЧХ) широкополосных фотоприемников. Представлены результаты измерения АЧХ в диапазоне 1,5 ГГц для высокоскоростного фотодиода S5972 фирмы “Hamamatsu”.
|
| first_indexed | 2025-12-07T13:28:33Z |
| format | Article |
| fulltext |
ISSN 1562-6016. ВАНТ. 2013. №6(88) 244
APPLICATION OF FEMTOSECOND Ti-Sa LASERS FOR MEASURING
OF AMPLITUDE-FREQUENCY CHARACTERISTICS
OF WIDE-BAND PHOTODEVICES
A.V. Vasilyev, V.P. Zajtsev, V.P. Leshchenko, A.I. Povrozin
National Science Center “Kharkov Institute of Physics and Technology”, Kharkov, Ukraine
A possibility of an application of the femtosecond Ti-Sa lasers for a measuring of the amplitude-frequency char-
acteristics (AFC) of the wide-band photodevices is considered. The results of the measuring of the AFC in a fre-
quency range 1.5 GHz for a high-speed photodiode S5972 of the firm “Hamamatsu” are presented.
PACS: 42.60.J
A progress in a creating of the wide-band photode-
vices is driven by the needs in such areas as the optical
communication systems, the study of the fast processes,
a creating of the highly informative systems. In this
regard, a great importance has a knowledge of the am-
plitude-frequency characteristics (AFC) for such the
photodevices. A femtosecond Ti-Sa lasers can solve this
problem most simply. The presence in the consumer
market of the lasers generating the pulses with a dura-
tion shorter than 50 fs gives on principle possibility of
the study of the ultra-wide band photodevices in a fre-
quency range up to 50 1012 Hz. However, the real use of
the femtosecond lasers for this purpose requires of an
investigation of some the features associated with the
realization of the proposed methodology.
The method is based on the following suppositions.
The laser operates in mode-locked longitudinal modes
TEM00N (Fig. 1). The net instantaneous intensity at which
the photodevice responds in the case of mode-locked with
same amplitudes of the electric field E0 is on the form [1]:
I (t) = E0
2
2
02
sin
cos
sin
N t
t
t
, (1)
where ω0 – average frequency, N – number of generated
longitudinal modes, Ω pulse repetition frequency
equal to the intermode interval:
Ω=∆f = c/2L, (2)
where с – speed of a light in vacuo, L – length of the
laser cavity.
A mixture of the optical signals frequencies is in the
photodevice, this signals can be given off in the output
current i(t) of the photodevice by a band-pass filter
tuned to the beat signals with radio frequencies Δf, 2Δf,
3Δf, ..., (N-1) Δ f, the instantaneous values which are on
the form:
i(t) = D{
1
1
N
i
EίEί+1 cos∆f t +
2
1
N
i
EίEί+2 cos2∆f t
+
3
1
N
i
EίEί+3 cos3∆f t + … +E1EN cos(N-1)∆f t}, (3)
where Ei – the amplitude of the electric field i-th mode
for the case when the amplitudes of the of the electric
fields of the different modes are different, D – the trans-
formation factor of the photodevice.
The method of the measuring of AFC of the wide-
band photodevices is based on the use of the beat sig-
nals at the difference frequencies of the modes TEM00N
registrated at photodevice within its bandwidth and then
measured by a spectrum analyzer.
It should be noted that the positive fact of the using
femtosecond Ti-Sa lasers to measure the AFC of the
wide-band photodevices that under the condition of the
full mode-locking power output fluctuations Ti-Sa la-
sers do not exceed 1…2% [2] under an extremely low
value of the frequency intermode interval ∆f fluctua-
tions [3].
The specificity of the application of the Ti-Sa lasers
to measure the AFC of the wide-band photodevices is
connected with either the fact that the emission spec-
trum of this laser has a Gaussian shape or the form
sech2. It is known that it is necessary to give at the input
of the investigated photodevice the signals of the equal
amplitudes within the investigated frequency range for
the standard method for measuring AFC of any receiv-
ers, include photodevices.
We consider inserting a limit on the measurement
AFC of the wide-band photodevices the shape envelope
of the emission spectrum Ti-Sa laser.
Let Ti-Sa laser generates pulses whose shape is
sech2 and the emission spectral width at half of the level
is 41 nm, width corresponds to the frequency range
F 18.97 1012 Hz. Calculations made on the basis of
the measured spectral characteristics of the laser radia-
tion (Fig. 2) show that the greatest slope of the spectrum
envelope amplitude of its spectral components differ by
2% in the frequency range of 200 109 Hz.
Therefore, the applying of Ti-Sa laser for measuring
AFC of the wide-band photodevices with the error 2%
in this frequency range satisfies to the demand of the
standard method for determining AFC of the receivers.
Another feature of this method is reducing the num-
ber of components in the summary signal of the beats
with the increase of the difference frequency. It is clear
from the formula (3). For example, the number of the
components of the beat signal for the value of the inter-
mode interval ∆f = 100 MHz in the frequency within the
generation band ∆F = 1013 Hz will be the value 105. And
the number of the components of the beat signal for the
value of the intermode interval ∆f = 1000 MHz in that
frequency will be nine less than ∆f = 100 MHz. This
will give the difference of the number of the beat signal
at these frequencies on the value of 0.009%. Therefore,
the methodical error will be equal to the value 0.009%,
when measuring AFC of the photodevice with a band-
width 1000 MHz.
The calculation show that the methodical error 2%
will correspond to the measuring of AFC of the photo-
device in the frequency range of about 200 GHz.
ISSN 1562-6016. ВАНТ. 2013. №6(88) 245
Thus, the use of the femtosecond Ti-Sa lasers for the
measuring AFC of the wide-band photodevices gener-
ates the wide research prospects in an extremely wide
range of the frequencies.
The Ti-Sa lasers can be tunable on the frequency in
the range of about 50 MHz for a more detailed research
of AFC in the frequency range of interest areas. This
can be accomplished by the changing of the cavity
length L (2).
The practical realization of the method illustrated on
the block-scheme in Fig. 1.
Fig. 1
Ti-Sa laser 1 generated longitudinal modes ТЕМ00N.
The linearly polarized laser beam passed through a po-
larizer 2, which served as an adjustable attenuator, and
fell on the investigated wide-band photodevice 3. The
intensity of a radiation at the input of the photodevice
was controlled and maintained at a certain level. The
output signal from the photodevice 3 enters to the input
of the spectrum analyzer 4. This analyzer measures am-
plitudes and frequencies of the beat signals.
The Ti-Sa laser developed at IPENMA NSC KIPT
was used in the experiments. It generated the pulses at a
wavelength 782 nm spectral width at half that level was
18.97 1012 Hz (41 nm). The fluctuations of the laser
output power did not exceed 1.5%. The frequency sta-
bility of the intermode frequency interval was no worse
than 10–5. Fig. 2 shows the laser spectrum.
Fig. 2
The high-speed photodiode S5972 firm "Hamamatsu"
used as investigated wide-band photodevice. A feeding
voltage was 15 V. The measurements were performed at
ambient temperature 20°C.
The signals detected at the photodevice output by
the spectrum analyzer C4 - 27 with 50-Ohm input.
Fig. 3 shows the results of the combined measuring
for the AFC of the photodiode S5972 with taking into
account on it the influence of the coaxial cable and con-
nectors.
Fig. 3
That combined AFC extends closely to 1.4 GHz. It
can be seen from Fig. 3 (see curve 1). Its irregularity is
probably caused by the losses and the re-reflections in
the coaxial cable and connectors. AFC was measured at
frequencies which are multiple to the intermode interval
Δf = 85.86 MHz for the resonator length of the Ti-Sa
laser 174.7 cm and at the frequencies which are multiple
to the intermode interval Δf = 94.5 MHz for the resona-
tor length of the Ti-Sa laser 158.7 cm. The connecting of
the photodevice without the concordant coaxial cable to
the spectrum analyzer is illustrated in Fig. 3 (see curve 2).
The investigated photodevice S5972 was connected to the
spectrum analyzer by the short (2 cm) conductors. The
uniformity of AFC of the spectrum analyzer in the meas-
urements was controlled by the generator G4-67A.
Thus, the grounding of the possibility of the using of
the femtosecond Ti-Sa lasers to measure the AFC of the
wide-band photodevices in the frequency band up to
200 GHz with a methodical error not exceeding 2% is
presented.
REFERENCES
1. W. Kleen, R. Muller //Laser. Berlin (West), Heidel-
berg, New York; Springer-Verlag, 1969.
2. A. Sting, C. Spielmann, F. Krausz. Generation of
11-fs pulses from a Ti-Sa laser without the use of
prisms // Optics Letters. 1994, v. 19, №3, p. 204-206.
3. P.G. Krykov. Lazery Ultrakorotkih impulsov //
Kvantovaya elektronika. 2001, v. 31, №2, p. 95-119
(in Russian).
Article received 16.10.2013
ПРИМЕНЕНИЕ ФЕМТОСЕКУНДНЫХ Ti-Sa-ЛАЗЕРОВ ДЛЯ ИЗМЕРЕНИЯ АМПЛИТУДНО-
ЧАСТОТНЫХ ХАРАКТЕРИСТИК ШИРОКОПОЛОСНЫХ ФОТОПРИЕМНИКОВ
А.В. Васильев, В.П. Зайцев, В.П. Лещенко, А.И. Поврозин
Рассмотрена возможность применения фемтосекундных TI-Sa-лазеров для измерения амплитудно-
частотных характеристик (АЧХ) широкополосных фотоприемников. Представлены результаты измерения
АЧХ в диапазоне 1,5 ГГц для высокоскоростного фотодиода S5972 фирмы “Hamamatsu”.
ЗАСТОСУВАННЯ ФЕМТОСЕКУНДНИХ Ti-Sa-ЛАЗЕРIВ ДЛЯ ВИМIРЮВАННЯ АМПЛІТУДНО-
ЧАСТОТНИХ ХАРАКТЕРИСТИК ФОТОПРИЙМАЧІВ З ШИРОКИМ ДIАПАЗОНОМ ПРИЙМАННЯ
А.В. Васильєв, В.П. Зайцев, В.П. Лещенко, А.I. Поврозiн
Розглянуто можливість застосування фемтосекундних Ti-Sa-лазерів для вимірювання амплітудно-
частотних характеристик (АЧХ) фотоприймачів з широким діапазоном приймання. Наведено результати
вимірювання АЧХ у межах 1,5 ГГц для високошвидкісного фотодіода S5972 фірми “Hamamatsu”.
|
| id | nasplib_isofts_kiev_ua-123456789-112089 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T13:28:33Z |
| publishDate | 2013 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Vasilyev, A.V. Zajtsev, V.P. Leshchenko, V.P. Povrozin, A.I. 2017-01-17T15:10:20Z 2017-01-17T15:10:20Z 2013 Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices / A.V. Vasilyev, V.P. Zajtsev, V.P. Leshchenko, A.I. Povrozin // Вопросы атомной науки и техники. — 2013. — № 6. — С. 244-245. — Бібліогр.: 3 назв. — англ. 1562-6016 PACS: 42.60.J https://nasplib.isofts.kiev.ua/handle/123456789/112089 A possibility of an application of the femtosecond Ti-Sa lasers for a measuring of the amplitude-frequency characteristics (AFC) of the wide-band photodevices is considered. The results of the measuring of the AFC in a frequency range 1.5 GHz for a high-speed photodiode S5972 of the firm “Hamamatsu” are presented. Розглянуто можливість застосування фемтосекундних Ti-Sa-лазерів для вимірювання амплітудно-частотних характеристик (АЧХ) фотоприймачів з широким діапазоном приймання. Наведено результати вимірювання АЧХ у межах 1,5 ГГц для високошвидкісного фотодіода S5972 фірми “Hamamatsu”. Рассмотрена возможность применения фемтосекундных TI-Sa-лазеров для измерения амплитудно-частотных характеристик (АЧХ) широкополосных фотоприемников. Представлены результаты измерения АЧХ в диапазоне 1,5 ГГц для высокоскоростного фотодиода S5972 фирмы “Hamamatsu”. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Применение ускоренных пучков. Детекторы и детектирование ядерных излучений Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices Застосування фемтосекундних Ti-Sa-лазерiв для вимiрювання амплітудно- частотних характеристик фотоприймачів з широким дiапазоном приймання Применение фемтосекундных Ti-Sa-лазеров для измерения амплитудно- частотных характеристик широкополосных фотоприемников Article published earlier |
| spellingShingle | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices Vasilyev, A.V. Zajtsev, V.P. Leshchenko, V.P. Povrozin, A.I. Применение ускоренных пучков. Детекторы и детектирование ядерных излучений |
| title | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices |
| title_alt | Застосування фемтосекундних Ti-Sa-лазерiв для вимiрювання амплітудно- частотних характеристик фотоприймачів з широким дiапазоном приймання Применение фемтосекундных Ti-Sa-лазеров для измерения амплитудно- частотных характеристик широкополосных фотоприемников |
| title_full | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices |
| title_fullStr | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices |
| title_full_unstemmed | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices |
| title_short | Application of femtosecond Ti-Sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices |
| title_sort | application of femtosecond ti-sa lasers for measuring of amplitude-frequency characteristics of wide-band photodevices |
| topic | Применение ускоренных пучков. Детекторы и детектирование ядерных излучений |
| topic_facet | Применение ускоренных пучков. Детекторы и детектирование ядерных излучений |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/112089 |
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