WO2006092874A1 - 高分解・高速テラヘルツ分光計測装置 - Google Patents
高分解・高速テラヘルツ分光計測装置 Download PDFInfo
- Publication number
- WO2006092874A1 WO2006092874A1 PCT/JP2005/015791 JP2005015791W WO2006092874A1 WO 2006092874 A1 WO2006092874 A1 WO 2006092874A1 JP 2005015791 W JP2005015791 W JP 2005015791W WO 2006092874 A1 WO2006092874 A1 WO 2006092874A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- terahertz
- frequency
- time
- thz
- mode
- Prior art date
Links
- 238000005259 measurement Methods 0.000 claims abstract description 94
- 238000001228 spectrum Methods 0.000 claims abstract description 51
- 239000000523 sample Substances 0.000 claims abstract description 50
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 230000005684 electric field Effects 0.000 claims abstract description 27
- 238000004611 spectroscopical analysis Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 38
- 239000013078 crystal Substances 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 229910052701 rubidium Inorganic materials 0.000 claims description 5
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical group [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 208000018583 New-onset refractory status epilepticus Diseases 0.000 claims description 2
- 229910052792 caesium Inorganic materials 0.000 claims description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 18
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 abstract description 4
- 238000005086 pumping Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 19
- 238000004891 communication Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- 238000000862 absorption spectrum Methods 0.000 description 8
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 7
- 238000003325 tomography Methods 0.000 description 6
- 230000001131 transforming effect Effects 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 230000010354 integration Effects 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002594 fluoroscopy Methods 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 210000001520 comb Anatomy 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000000513 principal component analysis Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
Definitions
- This technology relates to a terahertz spectroscopic measurement technique using a terahertz electromagnetic wave pulse (hereinafter referred to as a THz pulse), and a THz pulse having a broadband spectrum structure in the frequency domain.
- a THz pulse terahertz electromagnetic wave pulse
- This relates to measurement technology that performs high-speed, high-resolution measurements at the laser mode-locked frequency, which is the theoretical limit frequency resolution.
- THz-TDS method terahertz time domain spectroscopy
- Figure 1 shows a typical frequency spectroscopy measurement system configuration using the THz-TDS method.
- the electric field time waveform of the THz pulse is obtained by pump-probe measurement (or cross-correlation measurement) of the THz pulse generated by the femtosecond laser and the probe pulse light.
- the pump 'probe measurement is performed by sequentially shifting the overlapping timing of the THz pulse and the probe pulse light using a time-delayed scanning by a mechanical stage, and the pulse of the probe pulse light at each overlapping timing.
- This is a technique for reconstructing an ultrafast time waveform that cannot be measured in real time by connecting the THz pulse intensities cut out in time by width.
- spectroscopic measurement is performed using the frequency spectrum of the measured time waveform of the terahertz electric field (THz electric field) by Fourier transform using a computer. Go and go.
- Fig. 3 shows the frequency spectrum of the amplitude of the THz electric field obtained by Fourier transform using a computer.
- the frequency resolution of the THz amplitude spectrum is expressed as 1ZT.
- the frequency resolution is determined by the measurement time window ⁇ (time delay scanning amount) of the THz electric field time waveform, which is the moving stroke length of the time delay scanning (mechanical stage) in Fig. 1. Limited by (L).
- the frequency range is the time delay feed step time. Is given by the reciprocal of the interval t (lZt).
- the frequency resolution is determined by the reciprocal of the measurement time window T (that is, the time delay scanning amount) of the time waveform of the THz electric field. This is actually limited by the moving stroke length (L) of the mechanical stage provided in the frequency measuring device.
- Equation 1 The stroke length (L) of the mechanical stage necessary to realize the pulse period time delay is defined by Equation 1 below.
- c indicates the speed of light.
- the mode locking frequency (f) of the femtosecond laser is defined by the following equation.
- Equation 3 By substituting Equation 2 into Equation 1, Equation 3 below is derived.
- Mode synchronization frequency control means for controlling
- a terahertz wave emitting means for emitting a terahertz electromagnetic wave pulse by using the output light of one femtosecond laser as excitation light and using a photoconductive switch or a nonlinear optical crystal;
- a terahertz wave for irradiating the terahertz electromagnetic wave radiation radiated from the terahertz wave radiation means to the spectroscopic measurement sample to further induce the terahertz electromagnetic wave norse affected by the sample.
- Optical system means for irradiating the terahertz electromagnetic wave radiation radiated from the terahertz wave radiation means to the spectroscopic measurement sample to further induce the terahertz electromagnetic wave norse affected by the sample.
- the output light of the other femtosecond laser is used as the probe pulse light, the terahertz electromagnetic wave pulse and the probe noise light are incident, and the terahertz electromagnetic wave is input using a photoconductive switch or an electro-optic sampling method.
- a trigger signal generating means for extracting a part of the output light of the two femtosecond laser means and generating a time origin signal
- a weak electric signal output from the terahertz wave detecting means is amplified, the signal output from the trigger signal generating means force is used as a time origin signal, and the signal of the terahertz electromagnetic wave pulse is synchronized with it.
- signal waveform measuring means that measures at high speed without being affected by timing jitter,
- a high-resolution high-speed terahertz spectrometer is provided.
- Two femtosecond laser light sources are used for THz pulse generation and probe pulse light, respectively, and the mode-locked frequencies of both laser light sources are highly stabilized, and the difference in mode-locked frequencies is a predetermined constant
- the timing at which the THz pulse and probe pulse light overlap automatically shifts from pulse to pulse, so a mechanical stage for time-delayed scanning is provided. It can be omitted, and the maximum measurement time window and quick measurement time can be realized simultaneously.
- the mode-synchronized frequency control means uses an electrical signal output as a frequency standard force as a reference signal, A high-resolution, high-speed terahertz spectroscopic measurement device according to a first aspect, characterized in that control is performed using a fundamental wave or a harmonic component of a synchronization frequency as a control signal.
- the frequency standard is a rubidium frequency standard or a cesium frequency standard
- the high resolution 'high-speed terahertz spectroscopy measurement according to the second aspect An apparatus is provided.
- the trigger signal is generated.
- the means extracts a part of the output light of the two femtosecond laser means, condenses it on the nonlinear optical crystal non-coaxially, and photoelectrically generates the generated SFG (sum frequency generation light) cross-correlation signal light.
- a high-resolution, high-speed terahertz spectroscopic measurement device according to any one of the first to third aspects is provided, which is a device that converts and outputs.
- the power of the signal waveform measuring means A time-axis scale conversion of the output terahertz electromagnetic wave pulse time waveform signal is performed, and a high resolution Fourier spectrum (amplitude and phase frequency spectrum) spectrum obtained by performing Fourier transform on the time axis scale conversion.
- Signal analysis means to obtain frequency analysis information of the sample,
- a high-resolution, high-speed terahertz spectrometer is provided.
- the mode-locked frequency control means is a high-resolution, high-speed tera, which is a means for controlling the resonator length of the femtosecond laser.
- a ruth spectrometer is provided.
- the mode-locked frequency of the femtosecond laser is determined by the length of the laser resonator, but varies depending on factors such as environmental temperature change and air fluctuation. This is because the optical resonator length of the laser fluctuates due to the above factors.
- the mode-locked frequency can be stabilized and controlled by controlling the length of the mechanical resonator of the femtosecond laser with precision.
- a frequency range, a sampling time, or a frequency range can be selected by selecting a frequency difference value held by the mode synchronization frequency control means.
- a high-resolution and high-speed terahertz spectroscopic measurement device that can arbitrarily set the time scale magnification is provided.
- a frequency comb An arrangement in which the frequency mode sequence is arranged like a comb is called a frequency comb, and a frequency comb in the optical region is called an optical comb.
- THz pulse generation using a femtosecond laser and a photoconductive switch can be regarded as wideband demodulation of a mode-locked pulse train via a photoconductive switch.
- the RF comb is extended to the terahertz region due to the ultrafast response of the photoconductive switch (or nonlinear optical effect), and such a RF comb in the terahertz region is defined as a THz comb in this specification. I will do it.
- the frequency interval of each frequency mode sequence constituting the THz comb is the mode-locked frequency, if a frequency resolution equal to the mode-locked frequency can be realized, the envelope wave of each single component peak of the frequency mode sequence constituting the THz comb (Envelope) can be extracted and detected.
- the THz comb has characteristics such as wide frequency selectivity, very high spectral purity, direct absolute frequency calibration, frequency multiplication function, and simplicity.
- a highly stable THz comb force is extracted from the frequency mode train, which is stable not only in frequency but also in phase and strength, and can provide high-quality THz waves. Therefore, if such a stable THz comb can be used as a frequency ruler in the THz region, it is expected to be a very useful tool in next-generation information communications, frequency standards, and high-resolution terahertz spectroscopy.
- the high-resolution, high-speed terahertz spectroscopic measurement device is one measurement technology that can arbitrarily select and detect a single frequency mode for the THz comb force, for example, applied to next-generation information communication. Then, frequency analyzer (decoder) of THz band wavelength division multiplexing communication with V and wavelength channels equal to the number of frequency modes (10,000 or more in THz spectrum band ITHz). There is an effect that can be used as.
- a single femtosecond laser beam is converted into pump light (THz panorace generation) and probe panorless light (THz panorace detection).
- the two are always synchronized. Therefore, in the THz-TDS method, time delay scanning is performed by a mechanical stage, cross-correlation measurement is performed while sequentially shifting the overlapping time timings by both pulse force THz detectors (pump-probe method), and finally the tera- It reproduces the Hertz time waveform.
- FIG. 2 shows a state in which the THz waveform is reconstructed by performing two time-delay scans by moving the mechanical stage and measuring three points. In actual measurements, THz waveforms are reconstructed by measuring at more measurement points.
- FIG. 6 shows a configuration diagram of a high-resolution, high-speed terahertz spectrometer according to the present invention.
- Both laser beams are used for THz pulse generation pump light and probe noise light, respectively. Further, a part of both laser beams is extracted and used for trigger signal generation means (for example, SFG (sum frequency wave generation light) intensity cross-correlator).
- SFG sum frequency wave generation light
- FIG. 7 is a schematic diagram showing how the terahertz time waveform is reproduced in the high-resolution / high-speed terahertz spectrometer according to the present invention.
- the pulse periods of the THz pulse and probe pulse light generated by the femtosecond optical sampling light source are slightly different. For this reason, the timing at which the THz panoramic light and the probe panoramic light overlap automatically shifts with each panoramic wave.
- the THz pulse period is lZf 2 and the probe pulse period is lZf 1.
- the time interval (sampling interval SI) that deviates for each pulse is defined by Equation 4 below.
- the trigger signal generation means generates a time origin signal every time the THz pulse and the probe pulse light overlap ((a) and (b) in FIG. 7). By using this as a trigger signal for the time origin, the signal waveform can be measured at high speed without being affected by timing jitter.
- the electric field time waveform of the THz pulse obtained in this way is observed with time expansion based on the principle of the optical sampling method.
- the time scale scaling factor (M) is defined by Equation 6 below.
- FIG. 8, FIG. 9, and FIG. 10 show correlation graphs of the mode-locked frequency difference ( ⁇ ) between the two femtosecond lasers, the frequency range, the sampling time, and the time scale enlargement rate, respectively.
- f and f are 80 MHz.
- sampling time and the time scale expansion rate can be arbitrarily set.
- the omission of the mechanical stage can simplify the optical system and reduce the size of the apparatus.
- Figure 11 shows an overall block diagram of the high-resolution, high-speed terahertz spectroscopic measurement device of this example.
- Femtosecond, laser 1 (mode-locked titanium 'sapphire laser, center wavelength 790nm, mode-locked frequency 82.6MHz, pulse width lOOfs) and femtosecond laser 2 (mode-locked titanium' sapphire laser, center wavelength 800nm, mode-locked frequency 82.6MHz ,
- a high-resolution 'high-speed terahertz spectrometer was developed using a pulse width of 10 fs).
- the mode-locked frequencies of the femtosecond laser 1 and the femtosecond laser 2 are almost the same.
- a femtosecond laser 2 was used for THz pulse generation, and a femtosecond laser 1 was used for probe pulse light.
- the mode-locked frequency of femtosecond laser 1 was controlled to be constant.
- the 10th harmonic component signal (826 MHz) of the mode synchronization frequency is beat-down to a beat signal of 1 MHz or less. Furthermore, the 10th harmonic difference frequency signal is generated by heterodyne detection of both signals and used as the control signal. This increases the fluctuation of the mode-locked frequency 10 times and uses it as a control signal to achieve high accuracy of stabilization control.
- the control signal difference frequency signal of the 10th harmonic
- the difference in mode-locked frequency is always stabilized at 100 Hz. .
- FIG. 12 shows difference frequency signals of mode-locked frequencies of two femtosecond laser light sources.
- the difference frequency fluctuates over time in the free-run state (the state in which stable control is not performed), but in the locked state (the state in which stable control is performed), the difference frequency is constant (97 Hz in Fig. 12). You can see how it is. In this way, high-resolution, high-speed terahertz spectroscopic measurement can be performed in a state in which the difference between the mode period frequencies of both lasers is sufficiently stabilized.
- SFG sum frequency generation light
- SFG intensity cross-correlation measuring section which is a trigger signal generating means (see FIG. 11).
- Both laser beams are focused non-coaxially on the nonlinear optical crystal using a lens.
- SFG intensity cross-correlation signal light of both laser beams is generated, photoelectrically detected with a photomultiplier tube, a weak current signal is amplified with a current-voltage conversion amplifier, and then high-resolution, high-speed terahertz spectroscopy measurement Used as the time origin signal of the device.
- FIG. 13 shows SFG (sum frequency generation light) cross-correlation waveforms of two femtosecond laser light sources obtained by the high resolution and high-speed terahertz spectroscopic measurement apparatus of Example 1. Yes. From Fig. 13, it can be seen that the cross-correlation waveform is sampled at high speed as a burst waveform by the probe pulse light (carrier wave). This SFG cross-correlation signal is used as the time origin signal of a high-resolution, high-speed terahertz spectrometer. [0054] As shown in FIG.
- the remainder of both laser beams is guided to the THz-TDS section, where femtosecond laser 1-2 is used as the pump light for THz generation, and femtosecond laser 1 is used as the probe light for THz detection. .
- a bow-tie photoconductive switch was used for THz generation and detection.
- the mode-locked frequency of the THz pulse generated by the femtosecond optical sampling light source and the probe pulse light is slightly different (100 Hz)
- the THz pulse electric field time of the pulse period time window (12 ns) without mechanical time delay scanning Waveforms can be sampled at high speed (measurement cycle 10 ms) (optical sampling method).
- the current signal sampled at high speed by the photoconductive switch for THz detection is amplified and low-pass filtered by the current-voltage conversion amplifier, and then digitally using the time origin signal generated by the SFG cross-correlation measurement unit as the synchronization signal. 'Measured with an oscilloscope.
- FIG. 14 (b) is an enlarged view of FIG. 14 (a).
- the pulse width is widened, but the electric field time waveform of the THz pulse can be confirmed.
- Figure 14 (c) shows the THz time waveform (measurement time 5 minutes, number of data 256 points) obtained by the conventional THz-TDS method (using a time delay stage and lock-in amplifier). Comparing Fig. 14 (b) and Fig. 14 (c), the characteristics of the two waveforms are almost the same. Force THz pulse waveform can be accurately acquired by the femtosecond optical sampling type THz-T DS method. Can be confirmed.
- Figure 15 shows the time waveform of the THz pulse at different measurement times (10ms, 100ms, Is, 10s), that is, the number of integrations (1, 10, 100, 1000). Sump It can be seen that the signal waveform can be acquired even during ring measurement (measurement time 10 ms). It can also be seen that the measured signal-to-noise ratio is improved by high-speed integration.
- an absorption spectrum and a refractive index vector can be calculated, respectively, and used for component analysis of the measurement object.
- Conventional force There has been spectroscopic analysis using visible light and infrared light, but conventionally only information on intensity (absorption) can be seen, but in THz-TDS, there are two parameters, absorption and refractive index specific to a substance. Since it can be identified by (complex refractive index), the identification of the substance is improved.
- the THz pulse time waveform Er (t) when there is no sample is measured, and the amplitude spectrum
- the time waveform Es (t) with the sample is Fourier transformed to obtain the amplitude spectrum
- Figure 17 shows a schematic of this.
- Equation 9 In L1, c is the speed of light and d is the thickness of the sample. Also, the force shown in Fig. 17 shows the transmission case.
- the THz-TDS method uses a THz pulse having a broadband spectrum, and therefore, it is possible to identify a frequency spectrum force substance having an absorption or refractive index obtained by Fourier transforming an electric field time waveform.
- the conventional THz-TDS has a problem in that a wide band spectrum can be acquired by one mechanical time delay scan, but a frequency resolution is not so high.
- the limitation on the frequency resolution is solved by the high resolution and high speed terahertz spectroscopic measurement apparatus according to the present invention, and the theoretical limit frequency resolution can be realized.
- Example 2 as an application of the high-resolution, high-speed terahertz spectroscopic measurement device according to the present invention, an ultra-wideband wavelength multi-band using a stabilized THz comb light source and a high-resolution, high-speed terahertz spectroscopic measurement device. Describes the heavy THz information communication.
- Figure 18 shows the overall block diagram.
- a femtosecond laser 1 (mode-locked titanium / sapphire laser, center wavelength 800 nm, mode-locked frequency 82.6 MHz, pulse width 10 fs) that can generate ultra-short pulses is used.
- THz When THz is generated using an optical comb and a photoconductive switch (or a non-linear optical crystal) modulated in this way, the wavelength multiplexed information of the optical comb is transferred to the THz comb.
- a femtosecond laser 1 mode-locked titanium / sapphire laser, center wavelength 790 nm, mode-locked frequency 82.6 MHz, pulse width 100 fs
- a photoconductive switch or nonlinear optical crystal
- the THz comb is generated by the demodulation process of femtosecond laser pulse light via a photoconductive switch (or nonlinear optical effect), it is stabilized by stabilizing the mode-locked frequency of femtosecond laser 2 THz A comb light source can be realized.
- the 100th harmonic component (8.26GHz) detected by the high-speed photodetector is a frequency signal synchronized to the rubidium frequency standard. It is extracted as a beat signal of 100kHz or less by detecting heterodyne and synthesizer.
- the resonator mirror mounted piezo element By controlling the resonator mirror mounted piezo element with the stability control circuit using the reference signal of the arbitrary waveform generator power of the rubidium frequency standard synchronization as the reference signal, the high stability of the mode-locked frequency, that is, the THz comb THz comb light source).
- the mode locking frequency of the femtosecond laser 2 for detecting THz needs to be stabilized so as to always maintain a certain frequency difference with respect to the mode locking frequency of the femtosecond laser 1.
- the optical sampling stability control circuit (Fig. 11) as in Example 1 it is difficult to stabilize at a difference frequency of 100 Hz or less due to the problem of the control band. As a result, the time scale enlargement ratio is maximum. Limited to 826,000 times.
- the optical sampling stability control system is changed so that it can be arbitrarily stabilized even with a difference frequency of 100 Hz or less.
- the control system of the THz detection femtosecond laser 1 is changed to the control system similar to the THz comb generation femtosecond laser 2 described above, and the mode synchronization frequency of each laser light source is set by two independent control systems. Stabilize.
- both lasers are generated. Highly stable mode synchronization frequency and difference frequency are simultaneously achieved.
- THz-TDS section The remainder of both laser beams is guided to the THz-TDS section, and the femtosecond laser 2 force THz generation pump light and the femtosecond laser 1 are used as the THz detection probe light.
- a photoconductive switch (or nonlinear optical crystal) is used for THz generation and detection.
- Wavelength-division-modulated THz comb that also radiates photoconductive switch force propagates in free space (or THz waveguide, THz fiber) and is detected by photoconductive switch.
- the mode-locked frequency of the THz pulse generated by the femtosecond optical sampling light source is slightly different from that of the probe noise light, the THz pulse electric field time waveform in the pulse period time window is measured at high speed without mechanical time delay scanning.
- the weak current signal sampled at high speed by the photoconductive switch for THz detection is amplified and low-pass filtered by the current-voltage conversion amplifier.
- the trigger signal generating means can be omitted, and the spectrum signal can be omitted.
- the THz amplitude spectrum is directly measured by the analyzer. As a result, it is possible to decode the wavelength division multiplexing communication information placed on the THz comb.
- Example 3 As an application of the high-resolution / high-speed terahertz spectrometer according to the present invention, the application to high-resolution / high-speed infrared time-domain spectroscopy (IR-TDS) is described. explain.
- IR-TDS infrared time-domain spectroscopy
- a Fourier transform infrared spectrometer which is a representative infrared spectroscopy, is composed of an infrared light source (thermal light source, etc.), a Michelson interferometer, and an infrared detector as shown in Fig. 19. ing.
- the interference fringes (interferograms) of infrared light are measured with an infrared detector by scanning a moving mirror, and the infrared absorption spectrum is obtained by Fourier transforming both. Get.
- the Fourier transform infrared spectroscopy is used in a wide range of application fields as a material identification method because it has almost no restrictions on the measurement sample and has an extensive database of standard fingerprint spectra in the infrared region.
- the wavelength resolution is defined by the reciprocal of the stroke length of the mechanical stage that scans the moving mirror, as in the conventional terahertz time-domain spectroscopy, so a long stage scan is required to obtain high wavelength resolution. .
- FIG. 20 shows an overall block diagram of the infrared time domain spectrometer.
- the apparatus configuration is almost the same as that of the first embodiment (configuration shown in FIG. 11).
- a THz spectrum of about 2 THz can be obtained relatively easily by using a photoconductive switch or a nonlinear optical crystal for the terahertz generator and detector. .
- a nonlinear optical crystal or electro-optic crystal
- infrared light generation efficiency or detection efficiency
- measurement is performed. It is possible to extend the bandwidth to the terahertz region force infrared region.
- infrared time-domain spectroscopy IR-TDS
- IR-TDS infrared time-domain spectroscopy
- the thermal characteristic of the thermal infrared detector generally used in Fourier transform infrared spectroscopy High sensitivity and high S / N ratio can be measured without being affected by dynamic background noise.
- Example 4 a high-speed 'deep-penetration terahertz fault is used as an application that takes advantage of the characteristics of high-speed time waveform acquisition by a high-resolution' high-speed terahertz spectroscopic measurement device according to the present invention, which is not a frequency domain spectroscopic measurement
- the application to an imaging device (THz tomography) is explained. Internal fluoroscopy is an important measurement technique in various application fields, and X-ray diagnosis and ultrasonic diagnosis have been put into practical use. Since the former is highly invasive and the latter is contact measurement, its application is limited.
- THz tomography is a typical measurement technique that makes full use of the features of THz pulses (free space propagation, good transmission characteristics, low scattering, non-invasiveness, ultrashort pulses, good beam directivity, etc.) ⁇
- Non-invasive ⁇ Because it can obtain 2D tomographic images with high spatial resolution, it is expected in fields such as biodiagnosis and non-destructive inspection as an internal fluoroscopy method to replace conventional methods such as ultrasonic echoes.
- the THz tomography of the conventional method is basically point measurement such as scanning imaging, and thus a multi-axis scanning mechanism is required to obtain an image, and there is a limit to the real-time property of measurement.
- a multi-axis scanning mechanism is required to obtain an image, and there is a limit to the real-time property of measurement.
- To obtain a 2D tomographic image of a sample A two-axis scan of the delay and sample position is required. In order to perform serial measurement of these 2D information while scanning, it took several hours and several hours of measurement time to obtain one image.
- FIG 21 shows the overall block diagram.
- the optical sampling light source control unit and SFG cross-correlation measurement unit are the same as in Example 1 (Fig. 11).
- the Terahertz optical system is changed from the conventional transmission arrangement to the reflection arrangement.
- the THz pulse emitted from the terahertz-generating photoconductive switch (or nonlinear optical crystal) is collimated by the lens and then partially reflected by the beam splitter.
- the reflected THz pulse is collected by the lens and applied to the sample.
- the THz echo pulse train temporally separated by the internal structure (group refractive index distribution) of the THz pulse is condensed and collimated by the lens, and then transmitted through the beam splitter. Finally, the THz echo pulse train and the probe light are incident on the THz detection photoconductive switch, and the electric field time waveform of the THz echo pulse is measured at high speed.
- the internal structure information in the sample depth direction is obtained from the obtained time waveform. Furthermore, two-dimensional tomographic images can be acquired by scanning the sample in the horizontal direction.
- the high-resolution / high-speed terahertz spectroscopic measurement device can be used as a frequency analyzer (decoder) in THz wavelength division multiplexing communication in next-generation information communication.
- a frequency analyzer decoder
- space THz communication using good directivity of THz pulses is expected. Because it is impossible to eavesdrop on the ground due to strong THz absorption of water vapor in the atmosphere, It is interesting as an inter-space communication method with excellent quality.
- FIG.1 Configuration diagram of a measuring device using the general THz-TDS method
- FIG.2 Schematic diagram showing how a THz-TDS method reproduces a terahertz time waveform by performing time-delayed scanning using a mechanical stage
- the time waveform force of the measured THz electric field also shows the frequency spectrum of the amplitude of the THz electric field obtained by Fourier transform with a computer.
- FIG. 6 shows a configuration diagram of a high-resolution terahertz spectroscopic measurement apparatus according to the present invention.
- FIG. 7 is a schematic diagram showing a state of reproducing a terahertz time waveform in the high resolution terahertz spectrometer according to the present invention.
- FIG. 9 A correlation graph between the mode-synchronized frequency difference and the sampling time is shown.
- FIG. 10 A correlation graph between the mode-synchronized frequency difference and the time scale magnification.
- FIG. 11 is a block diagram showing the overall configuration of the high-resolution terahertz spectroscopic measurement device according to Example 1.
- FIG. 12 is a diagram showing temporal variations before and after locking of the difference frequency of both laser modes of the high-resolution, high-speed terahertz spectrometer according to Example 1.
- FIG. 13 shows SFG cross-correlation signal waveforms of both lasers of the high-resolution “high-speed terahertz spectrometer” according to Example 1.
- FIG. 14 THz obtained by the high-resolution, high-speed terahertz spectrometer according to Example 1.
- a comparison of the electric field time waveform and the THz electric field time waveform obtained by the conventional mechanical THz-TDS is shown.
- c Conventional THz-TDS (lOOps full scale) ).
- FIG. 17 is a schematic diagram illustrating a mechanism for performing component analysis by amplitude and phase spectra by Fourier transforming a THz pulse time waveform distribution image.
- FIG. 20 shows a block diagram of the overall configuration of high-resolution, high-speed infrared time-domain spectroscopy according to Example 3.
- FIG. 21 is a block diagram showing the overall configuration of high-speed / deep penetration THz tomography according to Example 4.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007505795A JP4565198B2 (ja) | 2005-03-01 | 2005-08-30 | 高分解・高速テラヘルツ分光計測装置 |
US11/885,335 US7605371B2 (en) | 2005-03-01 | 2005-08-30 | High-resolution high-speed terahertz spectrometer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-055367 | 2005-03-01 | ||
JP2005055367 | 2005-03-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006092874A1 true WO2006092874A1 (ja) | 2006-09-08 |
Family
ID=36940920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/015791 WO2006092874A1 (ja) | 2005-03-01 | 2005-08-30 | 高分解・高速テラヘルツ分光計測装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7605371B2 (ja) |
JP (1) | JP4565198B2 (ja) |
WO (1) | WO2006092874A1 (ja) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008080300A1 (fr) * | 2006-12-31 | 2008-07-10 | Tsinghua University | Procede et dispositif de mesure de spectroscopie en domaine temporel terahertz |
JP2008157873A (ja) * | 2006-12-26 | 2008-07-10 | Olympus Corp | 顕微鏡法および顕微鏡 |
JP2008215914A (ja) * | 2007-03-01 | 2008-09-18 | National Institute Of Information & Communication Technology | テラヘルツ分光による文化財の検査方法 |
JP2010002220A (ja) * | 2008-06-18 | 2010-01-07 | Advantest Corp | 光測定装置 |
JP2010002218A (ja) * | 2008-06-18 | 2010-01-07 | Advantest Corp | 光測定装置 |
JP2010190887A (ja) * | 2009-01-23 | 2010-09-02 | Canon Inc | 分析装置 |
JP2010531444A (ja) * | 2007-06-26 | 2010-09-24 | ユニバーシテ ラバル | 光周波数コムのビートスペクトルの基準付け |
US7808636B2 (en) | 2007-01-11 | 2010-10-05 | Rensselaer Polytechnic Institute | Systems, methods, and devices for handling terahertz radiation |
WO2010137536A1 (ja) * | 2009-05-25 | 2010-12-02 | 株式会社アドバンテスト | 光測定装置およびトリガ信号生成装置 |
JP2011007590A (ja) * | 2009-06-25 | 2011-01-13 | Advantest Corp | 光測定装置 |
JP2011525235A (ja) * | 2008-06-03 | 2011-09-15 | エスカーツェット・カーエフエー ゲーゲーエムベーハー クンストストッフ フォーシュング ウント エントヴィックルング | 可変時間パルス間隔を有する2つの光パルスを生成する方法 |
JP4782889B1 (ja) * | 2010-12-21 | 2011-09-28 | 株式会社アドバンテスト | 繰り返し周波数制御装置 |
JP4786767B1 (ja) * | 2010-12-27 | 2011-10-05 | 株式会社アドバンテスト | 繰り返し周波数制御装置 |
JP2012519879A (ja) * | 2009-03-06 | 2012-08-30 | イムラ アメリカ インコーポレイテッド | デュアルパルスレーザシステムによる光走査及び撮像システム |
JP2013057696A (ja) * | 2012-12-28 | 2013-03-28 | Japan Atomic Energy Agency | テラヘルツ測定法 |
WO2013145020A1 (ja) * | 2012-03-30 | 2013-10-03 | 株式会社日立製作所 | 時間領域分光装置および時間領域分光分析システム |
JP2013224826A (ja) * | 2012-04-19 | 2013-10-31 | Keio Gijuku | 分光計測装置 |
WO2014024699A1 (ja) * | 2012-08-07 | 2014-02-13 | 株式会社アドバンテスト | パルス光源およびパルスレーザ光の位相差を安定に制御する方法 |
WO2014034085A1 (ja) * | 2012-08-26 | 2014-03-06 | 国立大学法人大阪大学 | スペクトル分解能とスペクトル確度を向上するフーリエ変換型分光法、分光装置および分光計測プログラム |
US8676061B2 (en) | 2009-11-19 | 2014-03-18 | Advantest Corporation | Signal output device, and output apparatus of signal source of signals and of laser beam pulses |
CN104022427A (zh) * | 2014-04-28 | 2014-09-03 | 中国科学院上海光学精密机械研究所 | 波形可控太赫兹辐射的产生装置 |
JP2016535267A (ja) * | 2013-11-01 | 2016-11-10 | インテグリス−ジェタロン・ソリューションズ・インコーポレイテッド | 溶存酸素センサー |
WO2017119389A1 (ja) * | 2016-01-08 | 2017-07-13 | 国立大学法人東京大学 | フーリエ変換型分光装置 |
CN112326588A (zh) * | 2020-10-27 | 2021-02-05 | 欧必翼太赫兹科技(北京)有限公司 | 一种太赫兹时域光谱仪 |
Families Citing this family (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7190705B2 (en) | 2000-05-23 | 2007-03-13 | Imra America. Inc. | Pulsed laser sources |
US7809222B2 (en) | 2005-10-17 | 2010-10-05 | Imra America, Inc. | Laser based frequency standards and their applications |
US7929580B2 (en) * | 2006-09-22 | 2011-04-19 | Alcatel-Lucent Usa Inc. | Inexpensive terahertz pulse wave generator |
JP4895109B2 (ja) * | 2006-10-10 | 2012-03-14 | アイシン精機株式会社 | 形状検査方法及び形状検査装置 |
US7817282B2 (en) * | 2007-05-17 | 2010-10-19 | Georgia Tech Research Corporation | Use of crossed-beam spectral interferometry to characterize optical pulses |
ATE540294T1 (de) * | 2008-05-30 | 2012-01-15 | Nippon Telegraph & Telephone | Vorrichtung und verfahren zur messung von wellenlängen-multiplexing-signalen |
KR100996638B1 (ko) * | 2008-10-20 | 2010-11-26 | 한국표준과학연구원 | 테라헤르츠 펄스파 푸리에 변환 분광기 및 그 분광기를 이용한 분광방법 |
CN101566589B (zh) * | 2008-12-15 | 2011-08-10 | 深圳先进技术研究院 | 太赫兹成像装置和太赫兹成像方法 |
WO2011041472A1 (en) | 2009-10-02 | 2011-04-07 | Imra America, Inc. | Optical signal processing with modelocked lasers |
US8378304B2 (en) | 2010-08-24 | 2013-02-19 | Honeywell Asca Inc. | Continuous referencing for increasing measurement precision in time-domain spectroscopy |
JP5836683B2 (ja) * | 2010-08-24 | 2015-12-24 | キヤノン株式会社 | 電磁波発生素子、電磁波検出素子、時間領域分光装置 |
JP5675219B2 (ja) * | 2010-08-27 | 2015-02-25 | キヤノン株式会社 | 光パルス発生装置、テラヘルツ分光装置およびトモグラフィ装置 |
JP2012212870A (ja) * | 2011-03-18 | 2012-11-01 | Canon Inc | 光伝導素子 |
US8638443B2 (en) | 2011-05-24 | 2014-01-28 | Honeywell International Inc. | Error compensation in a spectrometer |
US20120306886A1 (en) | 2011-06-02 | 2012-12-06 | Tektronix, Inc | Continuous rf signal visualization with high resolution |
US20150117599A1 (en) * | 2013-10-31 | 2015-04-30 | Sigray, Inc. | X-ray interferometric imaging system |
EP2660585B1 (en) | 2012-05-02 | 2023-06-28 | IMEC vzw | Method and system for multiplexed optical analysis |
JP6139327B2 (ja) * | 2012-08-30 | 2017-05-31 | アークレイ株式会社 | テラヘルツ波分光測定装置及び方法、非線形光学結晶の検査装置及び方法 |
US10297359B2 (en) | 2013-09-19 | 2019-05-21 | Sigray, Inc. | X-ray illumination system with multiple target microstructures |
US10269528B2 (en) | 2013-09-19 | 2019-04-23 | Sigray, Inc. | Diverging X-ray sources using linear accumulation |
US10295485B2 (en) | 2013-12-05 | 2019-05-21 | Sigray, Inc. | X-ray transmission spectrometer system |
USRE48612E1 (en) | 2013-10-31 | 2021-06-29 | Sigray, Inc. | X-ray interferometric imaging system |
US10304580B2 (en) | 2013-10-31 | 2019-05-28 | Sigray, Inc. | Talbot X-ray microscope |
DE102013112935B3 (de) | 2013-11-22 | 2015-01-22 | Fraunhofer Institut für Physikalische Messtechnik | Vorrichtung und Verfahren zur S- Parameter-Charakterisierung von optoelektronischen Bauelementen |
US10401309B2 (en) | 2014-05-15 | 2019-09-03 | Sigray, Inc. | X-ray techniques using structured illumination |
CN104034689A (zh) * | 2014-06-04 | 2014-09-10 | 北京农业智能装备技术研究中心 | 基于压片法的土壤重金属含量的检测方法及装置 |
CN104297202B (zh) * | 2014-09-28 | 2017-10-20 | 首都师范大学 | 利用THz‑TDS频域谱定量检测粮食中农药残留的方法 |
US9429473B2 (en) * | 2014-10-16 | 2016-08-30 | Joseph R. Demers | Terahertz spectrometer and method for reducing photomixing interference pattern |
CN104764714B (zh) * | 2015-04-17 | 2017-09-15 | 西南科技大学 | 一种基于经验模态分解提高太赫兹频谱分辨率的方法 |
US10352880B2 (en) | 2015-04-29 | 2019-07-16 | Sigray, Inc. | Method and apparatus for x-ray microscopy |
US10295486B2 (en) | 2015-08-18 | 2019-05-21 | Sigray, Inc. | Detector for X-rays with high spatial and high spectral resolution |
JP6604629B2 (ja) * | 2016-02-15 | 2019-11-13 | 株式会社Screenホールディングス | 検査装置及び検査方法 |
CN105784634A (zh) * | 2016-03-31 | 2016-07-20 | 电子科技大学 | 垂直入射同时测透射和反射的太赫兹时域光谱仪 |
US10386650B2 (en) | 2016-10-22 | 2019-08-20 | Massachusetts Institute Of Technology | Methods and apparatus for high resolution imaging with reflectors at staggered depths beneath sample |
US10247683B2 (en) | 2016-12-03 | 2019-04-02 | Sigray, Inc. | Material measurement techniques using multiple X-ray micro-beams |
CN106769998A (zh) * | 2017-01-18 | 2017-05-31 | 上海朗研光电科技有限公司 | 基于主动调制脉冲非线性放大的太赫兹光谱实时分析方法 |
US20200006912A1 (en) * | 2017-02-27 | 2020-01-02 | University Of South Australia | An optical plural-comb generator, a method of generating an optical plural comb, and a plurality of mode locked lasers that are mechanically coupled and optically independent |
JP6937380B2 (ja) | 2017-03-22 | 2021-09-22 | シグレイ、インコーポレイテッド | X線分光を実施するための方法およびx線吸収分光システム |
EP3625547A4 (en) * | 2017-05-17 | 2021-01-13 | Spogen Biotech Inc. | AGROCHEMICAL DETECTION DEVICES, SYSTEMS AND METHODS AND AGROCHEMICAL COMPOSITIONS |
CN109696242A (zh) * | 2017-10-23 | 2019-04-30 | 首都师范大学 | 一种异步扫频THz时域光谱系统 |
US10578566B2 (en) | 2018-04-03 | 2020-03-03 | Sigray, Inc. | X-ray emission spectrometer system |
US10845491B2 (en) | 2018-06-04 | 2020-11-24 | Sigray, Inc. | Energy-resolving x-ray detection system |
JP7117452B2 (ja) | 2018-07-26 | 2022-08-12 | シグレイ、インコーポレイテッド | 高輝度反射型x線源 |
US10656105B2 (en) | 2018-08-06 | 2020-05-19 | Sigray, Inc. | Talbot-lau x-ray source and interferometric system |
DE112019004433T5 (de) | 2018-09-04 | 2021-05-20 | Sigray, Inc. | System und verfahren für röntgenstrahlfluoreszenz mit filterung |
CN112823280A (zh) | 2018-09-07 | 2021-05-18 | 斯格瑞公司 | 用于深度可选x射线分析的系统和方法 |
CN109459611B (zh) * | 2018-12-16 | 2020-01-10 | 华中科技大学 | 基于干涉仪的太赫兹短脉冲信号的抗干扰频谱测量方法 |
US11280669B2 (en) * | 2019-06-06 | 2022-03-22 | Government Of The United States Of America, As Represented By The Secretary Of Commerce | Pulsed laser interferometer and measuring vibrational amplitude and vibrational phase |
CN110132851B (zh) * | 2019-06-20 | 2021-07-30 | 合肥工业大学 | 一种基于飞秒单脉冲干涉的瞬时二维光声波测量方法 |
CN111896787A (zh) * | 2020-06-05 | 2020-11-06 | 北京无线电计量测试研究所 | 一种用于太赫兹脉冲辐射器辐射波形的测量系统及测量方法 |
CN112485223B (zh) * | 2020-11-18 | 2023-03-21 | 东南大学 | 一种时空分辨瞬态吸收显微光谱测量装置 |
CN112557763A (zh) * | 2020-12-17 | 2021-03-26 | 北京无线电计量测试研究所 | 一种频率测量装置及使用方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1096610A (ja) * | 1996-02-16 | 1998-04-14 | Imra America Inc | レーザパルス比較方法、高速レーザー走査方法、高速走査レーザー装置、短パルスレーザー装置、距離計測装置、電気光学サンプリング・オシロスコープ、短パルスレーザー安定制御方法および較正時間スケール発生装置 |
JP2003518617A (ja) * | 1999-12-28 | 2003-06-10 | ピコメトリックス インコーポレイテッド | テラヘルツ放射により物質の状態の変化を監視するためのシステムおよび方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6414473B1 (en) * | 1996-05-31 | 2002-07-02 | Rensselaer Polytechnic Institute | Electro-optic/magneto-optic measurement of electromagnetic radiation using chirped optical pulse |
JP3504592B2 (ja) * | 2000-07-24 | 2004-03-08 | 住友重機械工業株式会社 | パルスレーザ発生装置及びそれを利用したx線発生装置 |
EP1801939B1 (en) * | 2004-09-30 | 2013-03-06 | Japan Science and Technology Agency | Infrared light emitting device, infrared light detecting device, time-domain pulsed spectrometer apparatus, and infrared light emitting method |
-
2005
- 2005-08-30 US US11/885,335 patent/US7605371B2/en not_active Expired - Fee Related
- 2005-08-30 JP JP2007505795A patent/JP4565198B2/ja active Active
- 2005-08-30 WO PCT/JP2005/015791 patent/WO2006092874A1/ja not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1096610A (ja) * | 1996-02-16 | 1998-04-14 | Imra America Inc | レーザパルス比較方法、高速レーザー走査方法、高速走査レーザー装置、短パルスレーザー装置、距離計測装置、電気光学サンプリング・オシロスコープ、短パルスレーザー安定制御方法および較正時間スケール発生装置 |
JP2003518617A (ja) * | 1999-12-28 | 2003-06-10 | ピコメトリックス インコーポレイテッド | テラヘルツ放射により物質の状態の変化を監視するためのシステムおよび方法 |
Non-Patent Citations (5)
Title |
---|
JANKE C. ET AL.: "Asynchronous optical sampling for high-speed characterization of integrated resonant THz-biosensors", OPTICS LETTERS, vol. 30, no. 11, 1 June 2005 (2005-06-01), pages 1405 - 1407, XP003002055 * |
SANEYOSHI N. ET AL.: "Hidoki Hikari Sampling-shiki Terahertz Jikan Ryoiki Bunkoho no Tameno Femto-byo Hikari Sampling Kogen no Kaihatsu. (Femtosecond optical sampling light source for terahertz time domain spectroscopy based on the asynchronous optical sampling method)", OPTICS JAPAN 2004 KOEN YOKOSHU, 4 November 2004 (2004-11-04), pages 372 - 373, XP003002053 * |
SANEYOSHI N. ET AL.: "Hikari Sampling-shiki Terahertz Jikan Ryoiki Bunkoho(I) - Femto-byo Hikari Sampling Kogen no Kaihatsu-", EXTENDED ABSTRACTS; THE 65TH JAPAN SOCIETY OF APPLIED PHYSICS, no. 3, 1 September 2004 (2004-09-01), pages 985, XP003002052 * |
YASUI T. ET AL.: "Asynchronous optical sampling terahertz time-domain spectroscopy for ultrahigh spectral resolution and rapid data acquisition", APPLIED PHYSICS LETTERS, vol. 87, no. 6, ART. 061101, 1 August 2005 (2005-08-01), XP012077361 * |
YASUI T. ET AL.: "Terahertz Denjiha Pulse o Mochiita Kokino In-process Tosomaku Monitoring-ho no Kaihatsu (Highly-functional in-process monitoring of a painting film by use of a terahertz electromagnetic pulse)", HEISEI 16 NENDO KENKYU JOSEI JIGYO SEIKA HOKOKUKAI YOKOSHU SANGYO GIJUTSU KENKYU JOSEI JIGYO HEISEI 14 NENDO SAITAKU (SYURYOBUN NOMI) HEISEI 15 NENDO KEIZOKU KENKYU, vol. 2, December 2004 (2004-12-01), pages 80 - 85 (F-06), XP003002054 * |
Cited By (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008157873A (ja) * | 2006-12-26 | 2008-07-10 | Olympus Corp | 顕微鏡法および顕微鏡 |
GB2457409B (en) * | 2006-12-31 | 2011-01-05 | Univ Tsinghua | Method and apparatus for measuring terahertz time-domain spectrum |
GB2457409A (en) * | 2006-12-31 | 2009-08-19 | Univ Tsinghua | Method and device for measuring terahertz time-domain spectroscopy |
WO2008080300A1 (fr) * | 2006-12-31 | 2008-07-10 | Tsinghua University | Procede et dispositif de mesure de spectroscopie en domaine temporel terahertz |
US8796653B2 (en) | 2007-01-11 | 2014-08-05 | Rensselaer Polytechnic Institute | Terahertz radiation source mounting arrangements and methods of mounting a terahertz source |
US7808636B2 (en) | 2007-01-11 | 2010-10-05 | Rensselaer Polytechnic Institute | Systems, methods, and devices for handling terahertz radiation |
JP2008215914A (ja) * | 2007-03-01 | 2008-09-18 | National Institute Of Information & Communication Technology | テラヘルツ分光による文化財の検査方法 |
JP2010531444A (ja) * | 2007-06-26 | 2010-09-24 | ユニバーシテ ラバル | 光周波数コムのビートスペクトルの基準付け |
JP2011525235A (ja) * | 2008-06-03 | 2011-09-15 | エスカーツェット・カーエフエー ゲーゲーエムベーハー クンストストッフ フォーシュング ウント エントヴィックルング | 可変時間パルス間隔を有する2つの光パルスを生成する方法 |
JP2010002218A (ja) * | 2008-06-18 | 2010-01-07 | Advantest Corp | 光測定装置 |
JP2010002220A (ja) * | 2008-06-18 | 2010-01-07 | Advantest Corp | 光測定装置 |
US8279438B2 (en) | 2008-06-18 | 2012-10-02 | Advantest Corporation | Optical measuring apparatus |
JP2010190887A (ja) * | 2009-01-23 | 2010-09-02 | Canon Inc | 分析装置 |
JP2012519879A (ja) * | 2009-03-06 | 2012-08-30 | イムラ アメリカ インコーポレイテッド | デュアルパルスレーザシステムによる光走査及び撮像システム |
US8399835B2 (en) | 2009-05-25 | 2013-03-19 | Advantest Corporation | Light measurement apparatus and a trigger signal generator |
JP5386582B2 (ja) * | 2009-05-25 | 2014-01-15 | 株式会社アドバンテスト | 光測定装置およびトリガ信号生成装置 |
DE112010002114T5 (de) | 2009-05-25 | 2012-10-04 | Advantest Corporation | Optisches Messgerät und Triggersignalerzeugungsgerät |
WO2010137536A1 (ja) * | 2009-05-25 | 2010-12-02 | 株式会社アドバンテスト | 光測定装置およびトリガ信号生成装置 |
JP2011007590A (ja) * | 2009-06-25 | 2011-01-13 | Advantest Corp | 光測定装置 |
US8676061B2 (en) | 2009-11-19 | 2014-03-18 | Advantest Corporation | Signal output device, and output apparatus of signal source of signals and of laser beam pulses |
JP4782889B1 (ja) * | 2010-12-21 | 2011-09-28 | 株式会社アドバンテスト | 繰り返し周波数制御装置 |
US8306078B2 (en) | 2010-12-21 | 2012-11-06 | Advantest Corporation | Repetition frequency control device |
DE102011087725B4 (de) | 2010-12-21 | 2024-03-28 | Advantest Corporation | Folgefrequenzregelgerät |
JP4786767B1 (ja) * | 2010-12-27 | 2011-10-05 | 株式会社アドバンテスト | 繰り返し周波数制御装置 |
US9335261B2 (en) | 2012-03-30 | 2016-05-10 | Hitachi, Ltd. | Time-domain spectroscopy and time-domain spectroscopic analysis system |
WO2013145020A1 (ja) * | 2012-03-30 | 2013-10-03 | 株式会社日立製作所 | 時間領域分光装置および時間領域分光分析システム |
JPWO2013145020A1 (ja) * | 2012-03-30 | 2015-08-03 | 株式会社日立製作所 | 時間領域分光装置および時間領域分光分析システム |
JP2013224826A (ja) * | 2012-04-19 | 2013-10-31 | Keio Gijuku | 分光計測装置 |
US9190804B2 (en) | 2012-08-07 | 2015-11-17 | Advantest Corporation | Pulse light source, and method for stably controlling phase difference between pulse laser lights |
WO2014024699A1 (ja) * | 2012-08-07 | 2014-02-13 | 株式会社アドバンテスト | パルス光源およびパルスレーザ光の位相差を安定に制御する方法 |
JPWO2014024699A1 (ja) * | 2012-08-07 | 2016-07-25 | 株式会社アドバンテスト | パルス光源およびパルスレーザ光の位相差を安定に制御する方法 |
WO2014034085A1 (ja) * | 2012-08-26 | 2014-03-06 | 国立大学法人大阪大学 | スペクトル分解能とスペクトル確度を向上するフーリエ変換型分光法、分光装置および分光計測プログラム |
JPWO2014034085A1 (ja) * | 2012-08-26 | 2016-08-08 | 国立大学法人大阪大学 | スペクトル分解能とスペクトル確度を向上するフーリエ変換型分光法、分光装置および分光計測プログラム |
US9557220B2 (en) | 2012-08-26 | 2017-01-31 | Osaka Univeristy | Fourier transform spectroscopy method, spectroscopic device, and spectroscopic measurement program that improve spectral resolution and spectral accuracy |
JP2013057696A (ja) * | 2012-12-28 | 2013-03-28 | Japan Atomic Energy Agency | テラヘルツ測定法 |
JP2016535267A (ja) * | 2013-11-01 | 2016-11-10 | インテグリス−ジェタロン・ソリューションズ・インコーポレイテッド | 溶存酸素センサー |
CN104022427A (zh) * | 2014-04-28 | 2014-09-03 | 中国科学院上海光学精密机械研究所 | 波形可控太赫兹辐射的产生装置 |
WO2017119389A1 (ja) * | 2016-01-08 | 2017-07-13 | 国立大学法人東京大学 | フーリエ変換型分光装置 |
JPWO2017119389A1 (ja) * | 2016-01-08 | 2018-10-25 | 国立大学法人 東京大学 | フーリエ変換型分光装置 |
US10379042B2 (en) | 2016-01-08 | 2019-08-13 | The University Of Tokyo | Fourier transform-type spectroscopic device |
CN112326588A (zh) * | 2020-10-27 | 2021-02-05 | 欧必翼太赫兹科技(北京)有限公司 | 一种太赫兹时域光谱仪 |
Also Published As
Publication number | Publication date |
---|---|
US7605371B2 (en) | 2009-10-20 |
JPWO2006092874A1 (ja) | 2008-08-14 |
JP4565198B2 (ja) | 2010-10-20 |
US20080165355A1 (en) | 2008-07-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4565198B2 (ja) | 高分解・高速テラヘルツ分光計測装置 | |
US8917396B2 (en) | Fourier transform spectrometer with a frequency comb light source | |
JP5250736B2 (ja) | 光周波数コムのビートスペクトルの基準付け | |
RU2371684C2 (ru) | Способ и устройство для измерения спектра временной области импульсов терагерцевого излучения | |
US9557220B2 (en) | Fourier transform spectroscopy method, spectroscopic device, and spectroscopic measurement program that improve spectral resolution and spectral accuracy | |
JP6386655B2 (ja) | テラヘルツ波発生装置及びそれを用いた分光装置 | |
WO2013047698A1 (ja) | 光干渉計、情報取得装置、及び情報取得方法 | |
JP2011191128A (ja) | テラヘルツ波測定装置及び測定方法 | |
Roberts et al. | A fast-scanning Fourier transform 2D IR interferometer | |
JP3896532B2 (ja) | テラヘルツ帯複素誘電率測定装置 | |
JP2004020352A (ja) | テラヘルツパルス光計測方法及び装置 | |
Fu et al. | Terahertz dual-comb spectroscopy: A comparison between time-and frequency-domain operation modes | |
KR100926039B1 (ko) | 초정밀 및 고분해능의 테라헤르츠 분광기 및 그 측정방법 | |
KR100996638B1 (ko) | 테라헤르츠 펄스파 푸리에 변환 분광기 및 그 분광기를 이용한 분광방법 | |
JP2007101319A (ja) | 伝達特性測定装置、方法、プログラムおよび記録媒体 | |
Hu et al. | High-resolution Fourier-transform intra-cavity laser absorption spectroscopy: application to 12C2H2 near 12 300 cm− 1 | |
JP2012208098A (ja) | 物性測定装置及び物性測定方法 | |
WO2007037217A1 (ja) | 分析装置 | |
Takahashi et al. | Frequency domain spectroscopy of free-space terahertz radiation | |
WO2024080301A1 (ja) | 高速スキャンフーリエ変換分光器及び分光方法 | |
JP2024056534A (ja) | 高速スキャンフーリエ変換分光器及び分光方法 | |
JP2004138524A (ja) | パルス間位相差測定方法および装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11885335 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007505795 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
NENP | Non-entry into the national phase |
Ref country code: RU |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: RU |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 05776248 Country of ref document: EP Kind code of ref document: A1 |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 5776248 Country of ref document: EP |