CN110274885B - Broadband time-resolved absorption spectrum single measurement device - Google Patents
Broadband time-resolved absorption spectrum single measurement device Download PDFInfo
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- CN110274885B CN110274885B CN201910595292.0A CN201910595292A CN110274885B CN 110274885 B CN110274885 B CN 110274885B CN 201910595292 A CN201910595292 A CN 201910595292A CN 110274885 B CN110274885 B CN 110274885B
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- 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
- G01N2021/3125—Measuring the absorption by excited molecules
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Abstract
The invention relates to a single measurement device of broadband time-resolved absorption spectrum; the broadband time-resolved absorption spectrum single measurement device solves the technical problems that an existing broadband time-resolved absorption spectrum single measurement device is complex in operation, high in cost and low in signal-to-noise ratio. A single measurement device of broadband time-resolved absorption spectrum is characterized in that: the device comprises a femtosecond pulse laser, a first beam splitter, a photoelectric detector, a second beam splitter, an optical Kerr gate unit, a detection unit and a pumping unit; a first beam splitter is arranged on an emergent light path of the femtosecond pulse laser; a photoelectric detector is arranged on a reflection light path of the first beam splitter, and a second beam splitter is arranged on a transmission light path of the first beam splitter; a pump unit is arranged on a reflection light path of the second beam splitter, and an optical Kerr gate unit is arranged on a transmission light path of the second beam splitter; the optical Kerr gate unit comprises an optical Kerr gate; the detection unit comprises a steady-state continuous light source, a light beam shaping system, a first cylindrical lens group, a sample, a second cylindrical lens group and a lifting lens.
Description
Technical Field
The invention relates to a time-resolved absorption spectrum device, in particular to a single measurement device for broadband time-resolved absorption spectrum.
Background
The time-resolved absorption spectrum technology is established on the pump-detection technology, namely, a beam of laser pulse is used for pumping a sample, sample molecules are pumped to an excited state, another beam of detection light which is delayed relative to the pump light is used for detecting the sample, the detection light and the pump light are crossed in the sample to realize the sampling of the sample, and then the change of the absorption spectrum characteristic of the sample along with the delay, namely the transient absorption spectrum dynamic characteristic, is obtained by measuring the detection light which penetrates through the sample.
The broadband time-resolved absorption spectrum single measurement technology is an instant single measurement technology of the time-resolved absorption spectrum with the detection light as a broadband light source.
The existing broadband time-resolved absorption spectrum single measurement device comprises a pumping unit and a detection unit, wherein pumping light in the pumping unit is a beam of femtosecond pulse laser, and detection light in the detection unit is a super-continuum spectrum laser pulse generated by a laser pumping medium or a chirp amplification laser pulse. The existing broadband time-resolved absorption spectrum single measurement device has the following defects:
1. the operation is complex and the cost is high. The detection light adopted by the existing broadband time-resolved absorption spectrum measuring device is mostly based on a super-continuum spectrum laser pulse or a chirped amplified laser pulse generated by a laser pumping medium, wherein the generation of the super-continuum spectrum laser pulse is based on various nonlinear effects of the laser pumping medium, and the requirements and thresholds of different nonlinear effects on phase matching are different, so that competition phenomena exist among various effects, and the stable super-continuum spectrum is generated, and the operation is complex and the cost is high; in addition, the chirped amplification of the laser pulse is based on the chirped amplification of the laser pulse, and the adjustment process is complex in operation and high in cost.
2. The signal to noise ratio is low. The pump light and the probe light in the existing broadband time-resolved absorption spectrum single measurement device are coherent light, noise is introduced due to coherence between the pump light and the probe light, the signal to noise ratio is reduced, and meanwhile, the chirp characteristics of the supercontinuum laser pulse and the chirped laser pulse also influence the time precision of time-resolved absorption spectrum measurement, so that noise is introduced, and the signal to noise ratio is reduced.
Disclosure of Invention
The invention provides a broadband time-resolved absorption spectrum single measuring device, which aims to solve the technical problems of complex operation, high cost and low signal-to-noise ratio of the existing broadband time-resolved absorption spectrum single measuring device.
The technical solution of the invention is as follows:
a single measurement device of broadband time-resolved absorption spectrum is characterized in that:
the device comprises a femtosecond pulse laser, a first beam splitter, a photoelectric detector, a second beam splitter, an optical Kerr gate unit, a detection unit and a pumping unit;
a first beam splitter is arranged on an emergent light path of the femtosecond pulse laser; a photoelectric detector is arranged on a reflected light path of the first beam splitter, and a second beam splitter is arranged on a transmitted light path of the first beam splitter; a pump unit is arranged on a reflected light path of the second beam splitter, and an optical Kerr gate unit is arranged on a transmission light path of the second beam splitter;
the optical Kerr gate unit comprises an optical Kerr gate and a first light barrier;
the detection unit comprises a steady-state continuous light source, a light beam shaping system, a first cylindrical lens group, a sample, a second cylindrical lens group and a lifting lens, wherein the steady-state continuous light source and the light beam shaping system are sequentially arranged along an incident light path of the optical Kerr gate; an emergent light path of the lifting mirror is sequentially provided with an image correction spectrometer and an area array detector;
the area array detector is connected with the output end of the photoelectric detector.
Further, the pumping unit comprises a first reflector, a second reflector arranged on a reflection light path of the first reflector, a lens arranged on the reflection light path of the second reflector in sequence, and a second light blocking plate.
Further, the first reflector is a right-angle reflector.
Further, the steady-state continuous light source is a tungsten halogen lamp.
Further, the beam shaping system is a lens group.
Further, in order to achieve higher detection accuracy, the area array detector is a CCD detector.
Further, the lens is a convex lens.
Compared with the prior art, the invention has the beneficial effects that:
1. the steady-state continuous light in the invention is regulated and controlled into time sequence space coding light pulse after passing through the optical Kerr gate, and then the time sequence space coding light pulse is taken as the detection light.
2. The detection light and the pump light are incoherent light, the detection light and the pump light cannot generate coherence in a sample, the influence of a self-diffraction effect on a measurement result is avoided, and the signal-to-noise ratio is high.
3. The optical Kerr gate regulates and controls the steady-state continuous light into the time sequence space coding light pulse, and takes the time sequence space coding light pulse as the detection light.
4. The detection light in the invention is focused to the sample through the first cylindrical mirror and is crossed with the pumping light space in the sample, so that the sample is sampled, the intensity, spectrum and time information of the absorption spectrum can be instantly acquired at one time, and the measurement efficiency is high.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of the present invention;
the reference signs are:
1-first beam splitter, 2-photodetector, 3-second beam splitter, 401-optical Kerr gate, 402-first light barrier, 501-first cylindrical lens group, 502-sample, 503-second cylindrical lens group, 601-first reflector, 602-second reflector, 603-lens, 604-second light barrier, 7-probe light, 8-pump light, 9-area array detector trigger light and 10-gate light.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Referring to fig. 1, the apparatus includes a femtosecond pulse laser, a first beam splitter 1, a photodetector 2, a second beam splitter 3, an optical kerr gate unit, a detection unit, and a pumping unit.
A first beam splitter 1 is arranged on an emergent light path of the femtosecond pulse laser, and a photoelectric detector 2 is arranged on a reflection light path of the first beam splitter 1. A second beam splitter 3 is arranged on a transmission light path of the first beam splitter 1, a pumping unit is arranged on a reflection light path of the second beam splitter 3, and an optical Kerr gate unit is arranged on a transmission light path of the second beam splitter 3.
The optical kerr gate unit includes an optical kerr gate 401 and a first light barrier 402.
The pumping unit includes a first reflecting mirror 601, a second reflecting mirror 602 disposed in a reflected light path of the first reflecting mirror 601, a lens 603 sequentially disposed in a reflected light path of the second reflecting mirror 602, and a second light blocking plate 604.
The detection unit comprises a steady-state continuous light source, a light beam shaping system, a first cylindrical lens group 501, a sample 502, a second cylindrical lens group 503, a lifting mirror, an image correction spectrometer and an area array detector.
An optical Kerr gate 401, a beam shaping system, an edge optical Kerr gate 401, a first cylindrical lens group 501, a sample 502, a second cylindrical lens group 503 and a lifting mirror are sequentially arranged on an emergent light path of the steady-state continuous light source. The emergent light path of the lifting mirror is sequentially provided with an image correction spectrometer and an area array detector.
The first reflector 601 in this embodiment is a cube corner reflector; the steady-state continuous light source is a halogen tungsten lamp; the beam shaping system is a lens group; the area array detector is a CCD detector; the lens 603 is a convex lens.
The output end of the photoelectric detector 2 is connected with the area array detector.
The working principle of the device is as follows:
femtosecond pulse laser generated by the femtosecond pulse laser is divided into two beams through the first beam splitter 1, wherein one beam (approximately 4% of the femtosecond pulse laser) is used as trigger light 9 of the area array detector and is received by the photoelectric detector 2, and a photoelectric signal output by the photoelectric detector 2 is used as a trigger signal of the area array detector.
The other beam of light split by the first beam splitter 1 is split into two equal beams by a second beam splitter 3; one of the beams is incident on the optical kerr gate 401 as a gate light 10 for controlling the opening and closing of the optical kerr gate 401. The door light 10 transmitted through the optical kerr door 401 is shielded by the first light barrier 402 so as not to cause harm to the human. In this embodiment, the angle between the polarization direction of the gate light 10 and the polarization direction of the optical kerr gate 401 is 45 °.
The other beam of light split by the second beam splitter 3 is used as pump light 8. The pumping light 8 passes through the right-angle reflector 601, the second reflector 602, and the lens 603 and is focused on the sample 502, and the pumping light 8 passing through the sample 502 is shielded by the second light shielding plate 604, so as to avoid harming human beings.
Light emitted by the halogen tungsten lamp is shaped into a horizontal strip-shaped light beam after passing through a light beam shaping system, the light beam enters the optical Kerr gate 401, is spatially crossed with the gate light 10 in the optical Kerr gate 401, and is regulated and controlled by the gate light 10 to generate a time sequence spatial coding light pulse serving as the detection light 7. The detection light 7 is focused to the sample 502 through the first cylindrical mirror 501 and is spatially crossed with the pump light 8 in the sample 502, in the process, the sample is excited by the pump light 8, and the detection light 7 spatially samples absorption spectra of the sample in an excited state at different times. The detection light 7 transmitted through the sample 502 is shaped into a horizontal strip-shaped light beam through the second cylindrical mirror 503, then is converted into a vertical strip-shaped light beam after being rotated by 90 degrees through the lifting mirror, then enters the image correction spectrometer, a time-coded detection spectrum is expanded in space, finally the detection is carried out by the area array detector, finally the detection data of the area array detector is processed by computer programming, and the dynamic characteristic of the time-resolved absorption spectrum is instantly obtained at one time.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A single measurement device of broadband time-resolved absorption spectrum is characterized in that:
the device comprises a femtosecond pulse laser, a first beam splitter (1), a photoelectric detector (2), a second beam splitter (3), an optical Kerr gate unit, a detection unit and a pumping unit;
a first beam splitter (1) is arranged on an emergent light path of the femtosecond pulse laser; a photoelectric detector (2) is arranged on a reflected light path of the first beam splitter (1), and a second beam splitter (3) is arranged on a transmitted light path of the first beam splitter (1); a pumping unit is arranged on a reflection light path of the second beam splitter (3), and an optical Kerr gate unit is arranged on a transmission light path of the second beam splitter (3);
the optical Kerr-gate unit comprises an optical Kerr-gate (401) and a first light barrier (402);
the detection unit comprises a steady-state continuous light source, a light beam shaping system, a first cylindrical lens group (501), a sample (502), a second cylindrical lens group (503) and a lifting mirror, wherein the steady-state continuous light source and the light beam shaping system are sequentially arranged along an incident light path of the optical Kerr gate (401), and the first cylindrical lens group, the sample (502), the second cylindrical lens group and the lifting mirror are sequentially arranged along an emergent light path of the optical Kerr gate (401); an emergent light path of the lifting mirror is sequentially provided with an image correction spectrometer and an area array detector; the steady-state continuous light source is a halogen tungsten lamp;
the output end of the photoelectric detector (2) is connected with the area array detector;
the pumping unit comprises a first reflector (601), a second reflector (602) arranged on the reflection light path of the first reflector (601), a lens (603) and a second light baffle plate (604) which are sequentially arranged on the reflection light path of the second reflector (602); the lens (603) and the second light blocking plate (604) are respectively positioned on two sides of the sample (502).
2. The broadband time-resolved absorption spectrum single-pass measurement device of claim 1, wherein: the first reflector (601) is a right-angle reflector.
3. The broadband time-resolved absorption spectrum single-pass measurement device of claim 2, wherein: the beam shaping system is a lens group.
4. The broadband time-resolved absorption spectrum single-pass measurement device of claim 3, wherein: the area array detector is a CCD detector.
5. The broadband time-resolved absorption spectrum single-pass measurement device of claim 1, wherein: the lens (603) is a convex lens.
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