Optical transient absorption device

Abstract

The invention provides an optical transient absorption device which comprises a first beam splitter used for receiving an incident light beam provided by a first light source and splitting the incident light beam into a first sub-light beam and a second sub-light beam, the first sub-light beam provides a pump light beam, and the second sub-light beam provides a detection light beam; the white light generator is used for receiving the detection light beam and generating a detection spectrum; the detection module is used for combining the pump light beam and the detection spectrum, irradiating a sample and outputting a sample response signal; and the signal receiving module is used for collecting and processing the sample response signal. The single light source generates the pump light beam and the detection light beam through the first beam splitter, the white light generator is combined to generate the wide-spectrum detection spectrum, and the limitation that a traditional single-wavelength pump is narrow in wavelength tuning range and low in conversion efficiency is overcome. According to the design, the system structure is simplified, the spectrum flexibility and the signal-to-noise ratio are improved, and the measurement applicability and precision are improved.

Description

Technical Field

[0001] The invention relates to the field of optical technology, and in particular to an optical transient absorption device. Background Art

[0002] Transient absorption spectroscopy uses pump light to excite the sample and measures the changes in light absorption of the excited state through detection light. It can reveal the dynamic behavior of electrons, excitons or phonons in the material, such as relaxation or energy transfer processes, and is of great value in ultrafast dynamics research.

[0003] However, traditional transient absorption devices mostly use single-wavelength pumping to generate a fixed wavelength through nonlinear crystal conversion. The wavelength tuning range is narrow and it is difficult to adapt to diverse experimental needs. The low conversion efficiency leads to energy loss and affects the signal-to-noise ratio.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of the problems in the prior art, the present invention aims to provide an optical transient absorption device, which overcomes the technical limitations of traditional single-wavelength pumping.

[0006] The present disclosure provides an optical transient absorption device, comprising:

[0007] A first light source input terminal, used for connecting to a first light source;

[0008] A first beam splitter is used to receive an incident light beam provided by the first light source and split the incident light beam into a first sub-beam and a second sub-beam, wherein the first sub-beam provides a pumping light beam and the second sub-beam provides a detection light beam;

[0009] A white light generator is arranged on the optical path of the detection light beam and is used to receive the detection light beam and generate a detection spectrum;

[0010] The detection module is used to receive the pump beam and the detection spectrum generated by the white light generator, combine the pump beam and the detection spectrum to irradiate the sample, and output the sample response signal;

[0011] The signal receiving module is connected to the detection module and is used to collect and process the sample response signal.

[0012] Optionally, the optical transient absorption device further comprises: a first electrically controlled translation stage and a first reflecting mirror;

[0013] The first electric translation stage is used for:

[0014] Control the first reflector to move out of the optical path of the second sub-beam, so that the second sub-beam is transmitted to the white light generator, and the second sub-beam is used as a detection beam; or,

[0015] Controlling the first reflector to move into the optical path of the second sub-beam to block the second sub-beam from entering the white light generator;

[0016] A second beam splitter is arranged on the optical path of the first sub-beam, and the second beam splitter is used to split the first sub-beam into a first sub-beam and a second sub-beam. The first sub-beam provides a pump beam through the first sub-beam, and when the first reflector moves into the optical path of the second sub-beam, the second sub-beam provides a detection beam and is reflected by the first reflector to the input white light generator.

[0017] Optionally, the optical transient absorption device further comprises:

[0018] A second light source access end is used to connect to a second light source, and the second light source provides a second light beam;

[0019] a second reflector, the first electrically controlled translation stage is further used to selectively control the second reflector to move into or out of the optical path of the second light beam, when the second reflector moves into the optical path of the second light beam, the first reflector synchronously moves into the optical path of the second sub-beam, the first reflector blocks the second sub-beam, and the second light beam is reflected by the second reflector to provide a detection beam;

[0020] When the second reflecting mirror moves out of the optical path of the second light beam, the first reflecting mirror synchronously moves out of the optical path of the second sub-beam, and the second sub-beam provides a detection beam.

[0021] Optionally, the second light source comprises a supercontinuum white light source, and when the second reflector moves into the optical path of the second light beam, the white light generator is configured to be in a neutral position.

[0022] Optionally, the optical transient absorption device further comprises an additional optical path, the additional optical path comprising a first reflector group consisting of at least one reflector and a second electrically controlled translation stage;

[0023] Among them, the first reflector group is arranged on the optical path of the pump beam to extend the optical path of the pump beam, and the second electrically-controlled translation stage is used to dynamically adjust the position of the corresponding reflector in the first reflector group in the optical path of the pump beam to control whether the pump beam enters the additional optical path to adjust the detection time window.

[0024] Optionally, the optical transient absorption device further comprises:

[0025] A third light source access terminal is used to connect a third light source, and the third light source provides a third light beam;

[0026] a third reflector and a third electrically-controlled translation stage, wherein the third electrically-controlled translation stage is used for selectively controlling the third reflector to move into or out of the optical path of the third light beam, and when the third reflector moves into the optical path of the third light beam, the third light beam is reflected and the first sub-beam is blocked, and the reflected third light beam provides a pumping light beam;

[0027] When the third reflector is moved out of the optical path of the third light beam, the first sub-beam provides a pump beam.

[0028] Optionally, the second light source is an optical parametric amplifier light source.

[0029] Optionally, the optical transient absorption device further comprises:

[0030] A fourth light source access terminal is used to connect a fourth light source, and the fourth light source provides a fourth light beam;

[0031] a fourth reflector and a fourth electrically-controlled translation stage, wherein the fourth electrically-controlled translation stage is used for selectively controlling the fourth reflector to move into or out of the optical path of the fourth light beam, and when the fourth reflector moves into the optical path of the fourth light beam, the fourth light beam is reflected and the first sub-beam is blocked, and the reflected fourth light beam provides a pump light beam;

[0032] When the fourth reflector is moved out of the optical path of the fourth light beam, the first sub-beam provides a pump beam.

[0033] Optionally, the fourth light source is a fiber optic light source.

[0034] Optionally, the optical transient absorption device further comprises a tuning module, and the tuning module comprises a frequency doubling crystal and a color filter;

[0035] The frequency doubling crystal is arranged on the optical path of the pump beam to tune the wavelength of the pump beam. The color filter is arranged after the frequency doubling crystal to filter out the untuned fundamental frequency light in the pump beam after the wavelength is tuned, so as to output the tuned pump beam.

[0036] Optionally, the optical transient absorption device further comprises:

[0037] The time-delay scanning device is used to be arranged on the optical path of the detection beam before the white light generator, and includes: a hollow retroreflector, a fifth electrically controlled translation stage and a second reflector group;

[0038] Among them, the hollow reflector is used to reflect the detection light beam back in a manner of propagating in the opposite direction parallel to the incident direction, and the fifth electrically-controlled translation stage is used to drive the hollow reflector to move along the optical axis direction of the detection light beam, and adjust the total optical path of the detection light beam through multiple reflections between the hollow reflector and the second reflector group to adjust the time delay range.

[0039] The optical transient absorption device proposed in the embodiment of the present disclosure has the following advantages:

[0040] This implementation uses a single light source to generate a pump beam and a probe beam through a first beam splitter, and combines a white light generator to generate a wide-spectrum probe spectrum, overcoming the limitations of the narrow tuning range and low conversion efficiency of the traditional single-wavelength pump. This design simplifies the system structure, improves spectral flexibility and signal-to-noise ratio, and enhances measurement applicability and accuracy.

[0041] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0043] Figure 1 A structural framework diagram of an optical transient absorption device provided in an embodiment of the present disclosure;

[0044] Figure 2 for Figure 1 One of the schematic diagrams of the internal optical path structure of the optical transient absorption device shown;

[0045] Figure 3 for Figure 2 A schematic diagram of the internal optical path structure of a time-delay scanning device in the optical transient absorption device shown;

[0046] Figure 4 for Figure 1 The second schematic diagram of the internal optical path structure of the optical transient absorption device shown;

[0047] Figure 5 for Figure 1 The third schematic diagram of the internal optical path structure of the optical transient absorption device shown;

[0048] Figure 6 for Figure 1 The fourth schematic diagram of the internal optical path structure of the optical transient absorption device shown;

[0049] Figure 7 for Figure 1 The fifth schematic diagram of the internal optical path structure of the optical transient absorption device shown;

[0050] Figure 8 for Figure 1 The sixth schematic diagram of the internal optical path structure of the optical transient absorption device shown. DETAILED DESCRIPTION

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0052] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0053] In addition, the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0054] An analysis of related technologies shows that traditional transient absorption systems rely on single-wavelength pumping, which is converted by frequency doubling or mixing through nonlinear crystals, and the output wavelength is limited to the fundamental frequency light and its frequency doubling. This results in a limited wavelength tuning range for the pump light, which cannot cover a wider spectral range and limits the ability to excite different materials or dynamic processes.

[0055] In addition, the nonlinear crystal conversion efficiency is low, the energy loss is serious, and the pump light intensity is insufficient, which affects the signal-to-noise ratio of the excited state signal.

[0056] Another reason is that single-wavelength pumping cannot flexibly adapt to diverse experimental needs (such as the absorption characteristics of different samples), which limits the widespread application of transient absorption technology in fields such as optical physics and materials science.

[0057] The disclosed embodiments provide an improved optical transient absorption device, which overcomes the limitations of the narrow tuning range and low conversion efficiency of the conventional single-wavelength pump.

[0058] like Figure 1 As shown, the embodiment of the present disclosure provides an optical transient absorption device, which includes:

[0059] A first light source input terminal 1a, used for connecting a first light source 11;

[0060] A first beam splitter BS1 is used for receiving the incident light beam L provided by the first light source 11 and splitting the incident light beam L into a first sub-beam L11 and a second sub-beam L12, wherein the first sub-beam L11 provides a pumping light beam and the second sub-beam L12 provides a detection light beam;

[0061] A white light generator 2 is arranged on the optical path of the detection light beam, and is used to receive the detection light beam and generate a detection spectrum;

[0062] The detection module 3 is used to receive the pump beam and the detection spectrum generated by the white light generator 2, combine the pump beam and the detection spectrum to irradiate the sample, and output a sample response signal;

[0063] The signal receiving module 4 is connected to the detection module 3 and is used to collect and process the sample response signal.

[0064] The optical transient absorption device of this embodiment generates a pump beam and a detection beam through a single light source through the first beam splitter BS1, and generates a wide-spectrum detection spectrum in combination with a white light generator 2, thus overcoming the limitations of the narrow tuning range and low conversion efficiency of the traditional single-wavelength pump wavelength. This design simplifies the system structure, improves the spectral flexibility and signal-to-noise ratio, and enhances the measurement applicability and accuracy.

[0065] As an implementation, see Figure 2 , the incident light beam L is split into a first sub-beam L11 and a second sub-beam L12 by the first beam splitter BS1. The first sub-beam L11 is used as a pump beam, and the second sub-beam L12 is used as a detection beam. The white light generator 2 converts the white light into a white light detection spectrum. The detection spectrum and the pump beam are combined on the detection module 3 and then arrive at the signal receiving module 4.

[0066] In the embodiments of the present disclosure, Figure 2 As shown, the first light source 11 is a titanium sapphire laser, which provides a stable monochromatic incident light beam.

[0067] In an optional embodiment, the optical transient absorption device includes a tuning module 5, and the tuning module 5 includes a frequency doubling crystal BBO1 and a color filter F1;

[0068] The frequency doubling crystal BBO1 is arranged on the optical path of the pump beam (such as the first sub-beam L11) to tune the wavelength of the pump beam. The color filter F1 is arranged after the frequency doubling crystal BBO1 to filter out the untuned fundamental frequency light in the pump beam after the wavelength is tuned to output the tuned pump beam.

[0069] In this embodiment, the frequency doubling crystal BBO1 is a nonlinear optical crystal that can realize the conversion of laser frequency. Under the action of strong laser, this crystal can convert the pump light beam with a frequency of ω into a frequency doubling light with a frequency of 2ω through the secondary nonlinear effect, and the wavelength is modulated to half of the original wavelength. The color filter F1 is used to filter out the untuned fundamental frequency light.

[0070] Optionally, if tuning is not necessary, the frequency doubling crystal BBO1 and the color filter F1 may not be provided.

[0071] In an optional embodiment, the optical transient absorption device further includes an additional optical path 6, which includes a first reflector group 61 composed of at least one reflector (exemplarily including M6-M11) and a second electrically controlled translation stage 62 (not visible in the figure, indicated by a dotted line);

[0072] Among them, the first reflector group 61 is arranged on the optical path of the first sub-beam L11 providing the pump beam, and is used to extend the optical path of the pump beam. The second electrically-controlled translation stage 62 is used to dynamically adjust the position of the corresponding reflector in the first reflector group 61 in the optical path of the pump beam to control whether the pump beam enters the additional optical path, so as to adjust the detection time window.

[0073] For example, when the second electrically controlled translation stage 62 raises M6 and M11, which are the input reflector and the output reflector respectively, the pump beam passes through M6, M7, M8, M9, M10 and M11 in sequence, and then enters the detection module 3 after being emitted. This can increase the optical path of the pump beam, thereby extending the detection time window, effectively improving the detection time range, and meeting a wider range of experimental needs.

[0074] When there is no need to increase the optical path of the pump beam, the second electrically-controlled translation stage 62 can be controlled to drive M6 and M11 to lower so as to leave the optical path of the pump beam.

[0075] The number and arrangement of the reflectors in the first reflector group 61 of this embodiment are only examples. In application, the number and arrangement of the reflectors can be set according to actual needs to achieve the required optical path delay effect.

[0076] In this optional embodiment, the optical transient absorption device further includes: a chopper 7 and / or a light intensity attenuation device 8. Exemplarily, the chopper 7 and the light intensity attenuation device 8 are arranged on the optical path of the pump light beam (such as the first sub-beam L11), specifically before the detection module 3, so that the pump light beam enters the detection module 3 through the chopper 7 and the light intensity attenuation device 8.

[0077] The chopper 7 is used to modulate the frequency of the light beam. After the pump light beam is modulated and optimized, the pump light frequency is stable. The light intensity attenuation device 8 is used to adjust the intensity of the light beam so that the light intensity matches the sample requirements. Therefore, the optimized pump light beam has a high signal-to-noise ratio.

[0078] In the embodiment of the present disclosure, the optical transient absorption device: the delayed scanning device 9 is arranged on the optical path of the exploration beam before the white light generator 2 to extend the optical path of the exploration beam to the white light generator 2 .

[0079] Combination Figure 3 As shown, the delayed scanning device 9 includes:

[0080] A hollow retroreflector Retro1, a fifth electrically controlled translation stage 95 and a second reflector group 92;

[0081] Among them, the hollow reflector Retro1 is used to reflect the detection light beam back in a manner of propagating in the opposite direction parallel to the incident direction, and the fifth electrically-controlled translation stage 95 is used to drive the hollow reflector Retro1 to move along the optical axis direction of the detection light beam, and the total optical path of the detection light beam is adjusted through multiple reflections between the hollow reflector Retro1 and the second reflector group 92 to adjust the time delay range.

[0082] in, Figure 2 The second sub-beam L12 enters the delayed scanning device 9, and is output and then enters Figure 2 The white light generator 2 is shown.

[0083] The hollow retroreflector Retro1 reflects the incident light beam in a manner parallel to the incident direction but in the reverse direction. A single reflection forms a two-way path, and the optical path is doubled. The second reflector group 92 and the hollow retroreflector Retro1 form a reflection loop, and the detection light beam travels back and forth between the hollow retroreflector Retro1 and the second reflector group 92 multiple times, and each round trip increases the optical path by 2 times the translation distance. The fifth electrically-controlled translation stage 95 drives the hollow retroreflector Retro1 to move along the optical axis of the detection light beam, changing the distance between the hollow retroreflector Retro1 and the second reflector group 92. Multiple reflections convert the physical travel of the fifth electrically-controlled translation stage 95 into a larger optical path difference, and the optical path magnification factor is proportional to the number of reflections.

[0084] In this way, the detection beam enters the hollow reflector Retro1, is reflected and emitted to the second reflector group 92, and then returns to the hollow reflector Retro1, forming multiple return paths. At the same time, the fifth electric-controlled translation stage 95 moves the hollow reflector Retro1 to dynamically adjust the length of the return path. Therefore, multiple reflections convert the limited mechanical travel of the fifth electric-controlled translation stage 95 into a larger optical path change, breaking through the delay limitation of traditional single reflection and achieving wide range adjustment. Therefore, this design uses the principle of optical reflection to efficiently solve the problem of limited time delay range.

[0085] Optionally, the second reflector group 92 includes five reflectors, namely M15-M19. The detection beam is reflected from Retro1 to M15, and then passes through M16, M17, M18 to M19 in sequence, and returns to Retro1, making two round trips (four reflections), and the optical path length increases. Figure 2 As shown, M19 serves as an output reflector and is finally reflected to the white light generator 2 to generate a detection spectrum, which is combined with the pump beam in the detection module 3.

[0086] In this embodiment, the detection beam circulates between Retro1 and M15 - M19 , M15 - M19 are fixedly arranged, and M19 is angled to guide the detection beam to the white light generator 2 .

[0087] In this embodiment, the fifth electrically-controlled translation stage 95 moves Retro1 to dynamically adjust the optical path.

[0088] By using this embodiment in combination with the fifth electrically-controlled translation stage 95, the optical path adjustment range can be 0-2400 mm, and the time delay range can be extended to 0-8 ns.

[0089] The number and arrangement of the reflectors in the second reflector group 92 are merely examples, and can be adjusted as needed in actual applications.

[0090] In the embodiments of the present disclosure, Figure 2 As shown, the white light generator 2 is arranged after the delayed scanning device 9, receives the delayed detection beam (exemplarily the second sub-beam L12), uses the detection beam as the excitation light to generate a broadband detection spectrum (such as 400-800nm), and transmits the detection spectrum to the next step. The white light generator 2 receives the delayed monochromatic detection light (such as 800nm) and generates a broadband spectrum (such as 400-800nm).

[0091] In this embodiment, the white light generator 2 includes a plurality of switchable white light generating crystals (the figure shows a visible light generating crystal C1), which are used to generate visible light, near infrared light and / or ultraviolet spectrum, which is achieved through the nonlinear effect of the crystal. The detection spectrum covers the semiconductor absorption range, detects the response of different wavelengths, and improves the comprehensiveness of the measurement. The white light generating crystal is switched by a manual or electric gear switching device.

[0092] Specifically, the white light generator 2 can be configured with four gears, such as C1 generating visible light, C2 generating near infrared light, C3 generating ultraviolet light and neutral gear. The C1 crystal is stimulated to generate a visible band spectrum (400-800nm) or the C2 crystal is stimulated to generate a near infrared band spectrum (800-1600nm).

[0093] As mentioned above, the switching of the white light generating crystals can be controlled manually or by using another electrically controlled translation stage, which is not limited here.

[0094] Optionally, the white light generator 2 further comprises a parabolic mirror PM1 located behind the white light generating crystal C1, which is used to collimate the white light (convert the scattered light into parallel light) and transmit it to the detection module 3. PM1 ensures that the light beam is neat and avoids energy loss.

[0095] Optionally, the white light generator 2 further includes a lens La, through which the detection light beam enters the C1 crystal. L3 plays a focusing role. This optical path design is exemplary and can be adjusted according to actual conditions.

[0096] In the embodiment of the present disclosure, the detection module 3 combines the pump light beam and the detection spectrum and illuminates the sample, and receives the transmission signal. The detection module 3 completes the interaction between the light and the sample, and generates the spectrum change required for measurement.

[0097] Optionally, the detection module 3 includes a transient absorption microscopic detection module and a non-microscopic detection module, and the switching between microscopic and non-microscopic detection modes is achieved through a switching mechanism. This modular design allows the system to flexibly switch between different detection modes to adapt to different experimental requirements and application scenarios.

[0098] Transient absorption microscopy detection modules are usually used to capture and analyze transient dynamic processes of materials after being excited, such as the transfer of electrons and energy. Non-microscopy detection modules may involve non-destructive analysis of samples, such as characterization of structure and composition. The design of the switching mechanism allows users to easily switch between microscopy and non-microscopy detection modes according to the specific requirements of the experiment, thereby improving experimental efficiency and flexibility.

[0099] In this embodiment, the signal receiving module 4 may include a spectrometer, which may be connected to the control system 10 . The spectrometer collects a transmission spectrum with a sample response signal and transmits it to the control system 10 , which outputs an exciton relaxation curve.

[0100] For example Figure 2 As shown, the optical transient absorption device also includes a plurality of reflectors for changing the propagation direction of the light beam. For example, M3 located between the first beam splitter BS1 and the first light source 11 is used to change the propagation direction of the incident light beam L. In addition, M4, M5, M12, M13, M14, M20, M21, M22, M23, and M24, their positions and functions can be referred to Figure 2 The optical path shown will not be described in detail here.

[0101] like Figure 4 As shown, the embodiment of the present disclosure also provides another optical transient absorption device, Figure 2Differently, the optical transient absorption device further comprises: a first electrically controlled translation stage 31 and a first reflector M1;

[0102] The first electrically controlled translation stage 31 is used for:

[0103] Control the first reflector M1 to move out of the optical path of the second sub-beam L12, so that the second sub-beam L12 is transmitted to the white light generator 2, and the second sub-beam L12 is used as a detection beam; or,

[0104] Control the first reflector M1 to move into the optical path of the second sub-beam L12 to block the second sub-beam L12 from transmitting into the white light generator 2;

[0105] A second beam splitter BS2 is arranged on the optical path of the first sub-beam L11, and the second beam splitter BS2 is used for splitting the first sub-beam L11 into a first sub-beam L111 and a second sub-beam L112. The first sub-beam L11 provides a pump beam through the first sub-beam L111, and when the first reflector M1 moves into the optical path of the second sub-beam L12, the second sub-beam L112 provides a detection beam and is reflected by the first reflector M1 to the input white light generator 2.

[0106] In this embodiment, when the first reflector M1 is moved into the optical path of the second sub-beam L12, it blocks the second sub-beam L12. At this time, the second sub-beam L112 providing the detection beam originates from the first sub-beam L11, and its wavelength is different from the second sub-beam L12.

[0107] Correspondingly, in the white light generator 2, the white light generating crystal is switched to the ultraviolet generating crystal C3, and the frequency-doubled light beam excites the C3 crystal, thereby generating a detection spectrum in the ultraviolet band.

[0108] like Figure 5 As shown, the embodiment of the present disclosure also provides another optical transient absorption device, Figure 4 Differently, the optical transient absorption device also includes:

[0109] The second light source access terminal 1b is used to connect to the second light source 12, and the second light source 12 provides a second light beam L2;

[0110] The second reflector M2, the first electrically controlled translation stage 31 is further used to selectively control the second reflector M2 to move into or out of the optical path of the second light beam L2, when the second reflector M2 moves into the optical path of the second light beam L2, the first reflector M1 synchronously moves into the optical path of the second sub-beam L12, the first reflector M1 blocks the second sub-beam L12, and the second light beam L2 is reflected by the second reflector M2 to provide a detection beam;

[0111] When the second reflecting mirror M2 moves out of the optical path of the second light beam L2, the first reflecting mirror M1 synchronously moves out of the optical path of the second sub-beam L12, and the second sub-beam L12 provides a detection beam.

[0112] In this embodiment, the first reflector M1 and the second reflector M2 are simultaneously controlled by the first electrically controlled translation stage 31 to synchronously move into or out of the optical path of the second sub-beam L12. Thus, when M1 and M2 are synchronously moved into the optical path of the second sub-beam L12, M1 blocks the second sub-beam L12, and when M2 is simultaneously moved into the optical path of the second light beam L2, the second light beam L2 is changed in direction and transmitted to the delayed scanning device 9.

[0113] In this embodiment, the second light source 12 provides a wavelength different from that of the first light source 11. For example, the second light source 12 includes a supercontinuum white light source, and when the second reflector M2 moves into the optical path of the second light beam L2, the white light generator 2 is configured to be in neutral.

[0114] The supercontinuum white light source can provide a detection beam with an extremely wide spectrum. In this case, since the supercontinuum white light source directly generates white light and does not require excitation, the white light generator 2 is configured as idle.

[0115] In another embodiment, an independent electrically-controlled translation stage may be configured for the second reflector M2 , which is independent of the first electrically-controlled translation stage and cooperates with the first electrically-controlled translation stage to control the second light source 12 .

[0116] like Figure 6 As shown, the embodiment of the present disclosure also provides another optical transient absorption device, Figure 2 Differently, the optical transient absorption device also includes:

[0117] The third light source access terminal 1c is used to connect to a third light source 13, and the third light source 13 provides a third light beam L3;

[0118] a third reflector M30 and a third electrically-controlled translation stage 63, wherein the third electrically-controlled translation stage 63 is used for selectively controlling the third reflector M30 to move into or out of the optical path of the third light beam L3, and when the third reflector M30 moves into the optical path of the third light beam L3, the third light beam L3 is reflected and the first sub-beam L11 is blocked, and the reflected third light beam L3 provides a pumping beam;

[0119] When the third reflecting mirror M30 is moved out of the optical path of the third light beam L3, the first sub-beam L11 provides a pumping beam.

[0120] In this embodiment, the third light source 13 provides a wavelength different from that of the first light source 11. For example, the third light source 13 is an optical parametric amplifier (OPA) light source, which can directly output a pump beam with a tuned wavelength.

[0121] In this embodiment, the third electrically controlled translation stage 63 and Figure 2 The second electrically-controlled translation stage 62 shown can share one electrically-controlled translation stage, so M3, M6 and M11 can be moved in or out synchronously. When moving in synchronously, the third light beam L3 reflected from M3 enters M6.

[0122] In another embodiment, the third electrically-controlled translation stage may also be independent of the second electrically-controlled translation stage, and cooperate with the second electrically-controlled translation stage to provide the required pump light beam.

[0123] like Figure 7 As shown, the embodiment of the present disclosure also provides another optical transient absorption device, Figure 5 Different, it also includes:

[0124] The fourth light source access terminal 1d is used to connect to the fourth light source 14, and the fourth light source 14 provides a fourth light beam L4;

[0125] a fourth reflector M40 and a fourth electrically-controlled translation stage 74, wherein the fourth electrically-controlled translation stage 74 is used for selectively controlling the fourth reflector M40 to move into or out of the optical path of the fourth light beam L4, and when the fourth reflector M40 moves into the optical path of the fourth light beam L4, the fourth light beam L4 is reflected and the first sub-beam L11 is blocked, and the reflected fourth light beam L4 provides a pumping light beam;

[0126] When the fourth reflecting mirror M40 is moved out of the optical path of the fourth light beam L4, the first sub-beam L11 provides a pumping beam.

[0127] In this embodiment, a fourth light source 14 is provided independently of the first light source 11 to input light beams of different wavelengths. For example, the fourth light source 14 is a fiber light source.

[0128] In this embodiment, the fourth electric-controlled translation stage 74 and Figure 5 The second electric-controlled translation stage 62 shown shares an electric-controlled translation stage, so M40, M6 and M11 can be synchronously controlled to move in or out.

[0129] like Figure 8 As shown, the embodiment of the present disclosure also provides another optical transient absorption device, which integrates Figure 2 , Figure 4-Figure 7 The optical structure in the optical transient absorption device shown can be connected to four light sources at the same time to realize different light paths.

[0130] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. An optical transient absorption device, characterized in that: include: A first light source input terminal, used for connecting to a first light source; A first beam splitter, used for receiving the incident light beam provided by the first light source and splitting the incident light beam into a first sub-beam and a second sub-beam, wherein the first sub-beam provides a pumping light beam and the second sub-beam provides a detection light beam; A white light generator is arranged on the optical path of the detection light beam, and is used to receive the detection light beam and generate a detection spectrum; A detection module, used for receiving the pump beam and the detection spectrum generated by the white light generator, combining the pump beam with the detection spectrum to irradiate the sample, and outputting a sample response signal; The signal receiving module is connected to the detection module and is used to collect and process the sample response signal.

2. The optical transient absorption device according to claim 1, characterized in that: The optical transient absorption device further comprises: a first electrically controlled translation stage and a first reflecting mirror; The first electrically controlled translation stage is used for: Control the first reflector to move out of the optical path of the second sub-beam, so that the second sub-beam is transmitted to the white light generator, and the second sub-beam serves as the detection beam; or, Controlling the first reflector to move into the optical path of the second sub-beam to block the second sub-beam from entering the white light generator; A second beam splitter is arranged on the optical path of the first sub-beam, and the second beam splitter is used to split the first sub-beam into a first sub-beam and a second sub-beam. The first sub-beam provides the pump beam through the first sub-beam, and when the first reflector moves into the optical path of the second sub-beam, the second sub-beam provides the detection beam and is reflected by the first reflector to be transmitted to the white light generator.

3. The optical transient absorption device according to claim 2, characterized in that: The optical transient absorption device further comprises: A second light source access end, used to connect to a second light source, the second light source provides a second light beam; a second reflecting mirror, wherein the first electrically controlled translation stage is further used for selectively controlling the second reflecting mirror to move into or out of the optical path of the second light beam, when the second reflecting mirror moves into the optical path of the second light beam, the first reflecting mirror synchronously moves into the optical path of the second sub-beam, the first reflecting mirror blocks the second sub-beam, and the second light beam is reflected by the second reflecting mirror to provide the detection beam; When the second reflector moves out of the optical path of the second light beam, the first reflector synchronously moves out of the optical path of the second sub-beam, and the second sub-beam provides the detection beam.

4. The optical transient absorption device according to claim 3, characterized in that: The second light source comprises a supercontinuum white light source, and when the second reflector moves into the optical path of the second light beam, the white light generator is configured to be in a neutral position.

5. The optical transient absorption device according to claim 1, characterized in that: The optical transient absorption device further comprises an additional optical path, wherein the additional optical path comprises a first reflector group consisting of at least one reflector and a second electrically controlled translation stage; Among them, the first reflector group is arranged on the optical path of the pump beam to extend the optical path of the pump beam, and the second electrically-controlled translation stage is used to dynamically adjust the position of the corresponding reflector in the first reflector group in the optical path of the pump beam to control whether the pump beam enters the additional optical path to adjust the detection time window.

6. The optical transient absorption device according to claim 1, characterized in that: The optical transient absorption device further comprises: A third light source access terminal, used to connect a third light source, the third light source providing a third light beam; a third reflecting mirror and a third electrically-controlled translation stage, wherein the third electrically-controlled translation stage is used for selectively controlling the third reflecting mirror to move into or out of the optical path of the third light beam, and when the third reflecting mirror moves into the optical path of the third light beam, the third light beam is reflected and the first sub-beam is blocked, and the reflected third light beam provides the pumping light beam; When the third reflecting mirror is moved out of the optical path of the third light beam, the first sub-beam provides the pumping beam.

7. The optical transient absorption device according to claim 6, characterized in that: The third light source is an optical parametric amplifier light source.

8. The optical transient absorption device according to claim 1, characterized in that: The optical transient absorption device further comprises: A fourth light source access terminal, used to connect to a fourth light source, the fourth light source providing a fourth light beam; a fourth reflector and a fourth electrically-controlled translation stage, wherein the fourth electrically-controlled translation stage is used for selectively controlling the fourth reflector to move into or out of the optical path of the fourth light beam, and when the fourth reflector moves into the optical path of the fourth light beam, the fourth light beam is reflected and the first sub-beam is blocked, and the reflected fourth light beam provides the pump light beam; When the fourth reflecting mirror is moved out of the optical path of the fourth light beam, the first sub-beam provides the pumping beam.

9. The optical transient absorption device according to claim 8, characterized in that: The fourth light source is a fiber optic light source.

10. The optical transient absorption device according to claim 1, characterized in that: The optical transient absorption device further comprises a tuning module, wherein the tuning module comprises a frequency doubling crystal and a color filter; The frequency doubling crystal is arranged on the optical path of the pump beam to tune the wavelength of the pump beam. The color filter is arranged after the frequency doubling crystal to filter out the untuned fundamental frequency light in the pump beam after the wavelength is tuned, so as to output the tuned pump beam.

11. The optical transient absorption device according to claim 1, characterized in that: The optical transient absorption device further comprises: A time-delay scanning device, used to be arranged on the optical path of the detection beam before the white light generator, comprising: a hollow retroreflector, a fifth electrically controlled translation stage and a second reflector group; Among them, the hollow reflector is used to reflect the detection light beam back in a manner of propagating in the opposite direction parallel to the incident direction, and the fifth electrically-controlled translation stage is used to drive the hollow reflector to move along the optical axis direction of the detection light beam, and the total optical path of the detection light beam is adjusted through multiple reflections between the hollow reflector and the second reflector group to adjust the time delay range.

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