JPH0459457U

JPH0459457U -

Info

Publication number: JPH0459457U
Application number: JP10240090U
Authority: JP
Priority date: 1990-09-29
Filing date: 1990-09-29
Publication date: 1992-05-21

Description

[Brief explanation of the drawing]

第１図乃至第７図は本考案の実施例に係り、第
１図は紫外カース測定装置の構成図、第２Ａ図及
び第２Ｂ図は第１図に示す検光子７１，７８の透
過軸の配置と出力信号との関係を示すベクトル図
、第３図は、非線形光学素子５０について、入射
波長に対し第２高調波出射光が最大となる回転角
の測定結果を示す図、第４Ａ図は、第３図の測定
値を直線で回帰近似し色素レーザの波長走査に同
期してこの直線に基づき非線形光学素子５０を回
転させた場合の、非線形光学素子５０から出射さ
れる第２高調波の光強度の測定結果を示す図、第
４Ｂ図は、第３図の測定値を波長に関する３次曲
線で回帰近似し色素レーザの波長走査に同期して
この曲線に基づき非線形光学素子５０を回転させ
た場合の、非線形光学素子５０から出射される第
２高調波の光強度測定結果を示す図、第５図は、
ポンプ光波長を２６６ｎｍとし可動全反射プリズ
ム６２を固定しカース光強度を最大にした場合の
、プローブ光波長に対するカース光相対強度の測
定結果を示す図、第６図は、検光子７１を第２Ｂ
図に示す配置にしポンプ光波長を２６６ｎｍとし
ミラーを最適位置に移動させカース光強度を最大
にした場合の、プローブ光波長に対する位相整合
角の測定結果を示す図、第７図は、トリプトフア
ン５０μｍｏ１水溶液に対して紫外カース光スペ
クトルを測定した結果を示す図である。第８図は
従来の紫外カース測定装置の検光子の透過軸の配
置と出力信号との関係を示すベクトル図である。図中、１２，５０は非線形光学素子、１４は波
長分離器、２０，２２，３６，３７，６２は全反
射プリズム、２４，２６，４４，５５，５６，６
４，７３は平面鏡、２８，３８は1/2波長板、３
０，６０は偏光子、３２，４８，５９，７４はア
パーチヤ、３５は試料セル、３９，５７，７０は
半透鏡、４０，４６はシリンドリカルレンズ、４
２は色素レーザ、５３はバンドパスフイルタ、６
６は遮光板、７１，７８は検光子、７５，８０は
光結合レンズ、７６は二股光フアイバ、８４はポ
リ・モノクロメータ。 1 to 7 relate to an embodiment of the present invention, FIG. 1 is a configuration diagram of an ultraviolet curse measuring device, and FIGS. 2A and 2B are transmission axes of the analyzers 71 and 78 shown in FIG. 1. FIG. 3 is a vector diagram showing the relationship between the arrangement and the output signal. FIG. 3 is a diagram showing the measurement results of the rotation angle at which the second harmonic output light is maximized with respect to the incident wavelength for the nonlinear optical element 50. FIG. 4A is a vector diagram showing the relationship between the arrangement and the output signal. , the second harmonic emitted from the nonlinear optical element 50 when the measured values in FIG. FIG. 4B, a diagram showing the measurement results of the light intensity, is obtained by regressively approximating the measured values in FIG. 3 using a cubic curve related to wavelength, and rotating the nonlinear optical element 50 based on this curve in synchronization with the wavelength scanning of the dye laser. FIG. 5 is a diagram showing the measurement results of the light intensity of the second harmonic emitted from the nonlinear optical element 50 when
FIG. 6 is a diagram showing the measurement results of the relative intensity of the curse light with respect to the probe light wavelength when the pump light wavelength is 266 nm, the movable total reflection prism 62 is fixed, and the curse light intensity is maximized.
Figure 7 shows the measurement results of the phase matching angle with respect to the probe light wavelength when the pump light wavelength is 266 nm and the mirror is moved to the optimum position to maximize the curse light intensity in the arrangement shown in the figure. FIG. 3 is a diagram showing the results of measuring the ultraviolet curse light spectrum for FIG. 8 is a vector diagram showing the relationship between the arrangement of the transmission axis of the analyzer and the output signal of a conventional ultraviolet curse measuring device. In the figure, 12, 50 are nonlinear optical elements, 14 is a wavelength separator, 20, 22, 36, 37, 62 are total reflection prisms, 24, 26, 44, 55, 56, 6
4, 73 are plane mirrors, 28, 38 are 1/2 wavelength plates, 3
0, 60 are polarizers, 32, 48, 59, 74 are apertures, 35 are sample cells, 39, 57, 70 are semi-transparent mirrors, 40, 46 are cylindrical lenses, 4
2 is a dye laser, 53 is a bandpass filter, 6
6 is a light shielding plate, 71 and 78 are analyzers, 75 and 80 are optical coupling lenses, 76 is a bifurcated optical fiber, and 84 is a poly monochromator.

Claims

[Claims for Utility Model Registration] 1. A single light pulse emitted from a pulsed laser is divided into two parts, one of which generates ultraviolet wavelength pump light, and the other part of which excites a wavelength-tunable dye laser to produce monochromatic light. Generate light, pass it through a nonlinear optical element to generate a probe light of ultraviolet wavelength, irradiate the sample with the pump light and the probe light at the same position at the same time to generate a curse light, and generate the dye laser. Cursed light generation optical systems 10 to 64 scan the emission wavelength of the laser beam and change the phase matching angle between the pump light and the probe light in synchronization with the scanning; a beam splitter 70 that divides the beam into two, and a transmission axis A1 of which is the third-order nonlinear electric susceptibility x of the sample, and a non-resonant background component vector xN of ³ .
a first analyzer 71 that is set perpendicular to R and into which one of the divided cursed lights is incident; and a transmission axis ^A2 that is set perpendicular to the resonance component vector set,
a second analyzer 78 into which the other of the divided curse lights is incident; a spectrometer 84; and a first and second light beams emitted from the first and second analyzers are incident on the spectrometer. light guiding means 75, 76, 80 for guiding the light to the slit; and peak values _A1 and _A2 of the signals from the spectrometer for the first and second beams _;
An ultraviolet curse measuring device comprising: signal processing means 86 and 88 for obtaining a normalized spectrum by dividing by ₂ . 2 A single light pulse emitted from a pulsed laser is split into two, one of which generates ultraviolet wavelength pump light, and the other of which excites a wavelength-tunable dye laser to generate monochromatic light, which is then processed using nonlinear optics. Probe light with an ultraviolet wavelength is generated through the element, the pump light and the probe light are irradiated onto the sample at the same position at the same time to generate a curse light, the emission wavelength of the dye laser is scanned, and the wavelength of the dye laser is scanned. Cursed light generating optical systems 10 to 64 that change the phase matching angle between the pump light and the probe light in synchronization with scanning ^; a first analyzer 71 that is set parallel to the resonance component belt XR and into which one of ^the divided curse lights is incident; A second beam is set perpendicular to xR, and the other of the divided curse lights is incident.
an analyzer 78; a spectrometer 84; and light guide means 73, 75, 76, 80 for guiding first and second light beams emitted from the first and second analyzers to an entrance slit of the spectrometer. , for the peak values A ₁ and A ₂ of the signals from the spectrometer for the first and second beams, αA ₁ −βA ₂ = 0 in a wavenumber range away from the Raman vibration mode.
When constants α and β are selected so that (
An ultraviolet curse measuring device comprising: signal processing means 86 ^and 88 for obtaining a spectrum with a value proportional to αA ₁ −βA ₂ )/(βA ₂ ) ^1/2 . 3. The light guide means includes an aperture 74, a mirror 73 that bends the second light beam that has passed through the second analyzer, and a mirror 73 that bends the second light beam that has passed through the second analyzer. means for moving the mirror so that the center line of the light beam of No. 2 passes near the center of the hole of the aperture; optical means 75 and 76 for guiding the cursed light that has passed through the hole of the aperture to the spectroscope; 3. The device according to claim 1, further comprising optical means (76, 78) for guiding the first beam of light transmitted through one analyzer to the entrance slit of the spectrometer. 4. The nonlinear optical element is rotated in response to the wavelength of the monochromatic light from the dye laser incident thereon based on a rotation angle expressed as a cubic function of the wavelength of the monochromatic light, thereby producing ultraviolet second wavelength light. 4. The device according to claim 1, wherein the device emits harmonics.