CN-119413297-B - Pulse ultrafast measurement system and method based on time domain amplification method

Abstract

The invention discloses a pulse ultrafast measurement system based on a time domain amplification method, which comprises a reference pulse generation device, wherein the reference pulse generation device is sequentially connected with a first dispersion compensation optical fiber, a first power amplification device and a pulse shaping device, the pulse shaping device is connected with a beam combiner, the beam combiner is sequentially connected with a high nonlinear optical fiber, a first filter, a third dispersion compensation optical fiber, a second power amplification device and a first oscilloscope, the system also comprises a signal to be measured, the signal to be measured is connected with a second dispersion compensation optical fiber, and the second dispersion compensation optical fiber is connected with the beam combiner. The invention also discloses a pulse ultrafast measurement method based on the time domain amplification method.

Inventors

• HAN XIAOXIANG
• ZHANG XIN
• WANG FEIRAN
• YAN XIANGAN
• ZHANG GUOQING
• ZHANG HAIYANG
• ZHANG YUNJIE
• CHENG LIN
• WANG JUN
• LI JUN

Assignees

• 西安工程大学

Dates

Publication Date

20260512

Application Date

20241112

Claims (4)

1. 1. The pulse ultrafast measurement system based on the time domain amplification method is characterized by comprising a reference pulse generation device (1), a signal to be measured (6), a second dispersion compensation optical fiber (7) and a high nonlinearity optical fiber (8), a first filter (9), a third dispersion compensation optical fiber (10), a second power amplification device (11) and a first oscilloscope (12), wherein the reference pulse generation device (1) is sequentially connected with a first dispersion compensation optical fiber (2), a first power amplification device (3) and a pulse shaping device (4) through wires, the pulse shaping device (4) is connected with a beam combiner (5) through wires, the beam combiner (5) is sequentially connected with the high nonlinearity optical fiber (8), the first filter (9), the third dispersion compensation optical fiber (10), the second power amplification device (11) and the first oscilloscope (12) through wires, and the signal to be measured (6) is connected with the second dispersion compensation optical fiber (7) through wires, and the second dispersion compensation optical fiber (7) is connected with the beam combiner (5) through wires; The reference pulse generating device (1) comprises a first laser diode (13), a hybrid integrated device (14) and a first gain optical fiber (15), wherein the first laser diode (13) is connected with the hybrid integrated device (14) through a wire, the hybrid integrated device (14) is connected with the first gain optical fiber (15) through a wire, the first gain optical fiber (15) is connected with the first laser diode (13) through a wire, and the hybrid integrated device (14) is also connected with the first dispersion compensation optical fiber (2); The pulse shaping device (4) comprises a second filter (16), a first optical fiber coupler (17), an acousto-optic band-stop filter (18), a spectrometer (19), a second optical fiber coupler (20), a tunable time delay line (21) and a second oscilloscope (22), wherein the second filter (16) is connected with the first optical fiber coupler (17) through a wire, the first optical fiber coupler (17) is respectively connected with the acousto-optic band-stop filter (18) and the spectrometer (19) through wires, the acousto-optic band-stop filter (18) is connected with the second optical fiber coupler (20) through wires, the second optical fiber coupler (20) is respectively connected with the tunable time delay line (21) and the second oscilloscope (22) through wires, and the tunable time delay line (21) is also connected with the beam combiner (5).
2. 2. Pulse ultrafast measurement system based on time-domain amplification method according to claim 1, characterized in that the first power amplification device (3) comprises a third filter (23), a first wavelength division multiplexer (24), a second laser diode (25) and a second gain fiber (26), the third filter (23) is connected to the first wavelength division multiplexer (24) by a wire, the first wavelength division multiplexer (24) is connected to the second laser diode (25) by a wire, the first wavelength division multiplexer (24) is connected to the second gain fiber (26) by a wire, the third filter (23) is further connected to the first dispersion compensating fiber (2), the second gain fiber (26) is further connected to the second filter (16).
3. 3. The pulse ultrafast measurement system based on a time domain amplification method as set forth in claim 2, wherein the second power amplification device (11) includes a fourth filter (27), a second wavelength division multiplexer (28), a third laser diode (29) and a third gain fiber (30), the third dispersion compensation fiber (10) is connected to the fourth filter (27) through a wire, the fourth filter (27) is connected to the second wavelength division multiplexer (28) through a wire, the second wavelength division multiplexer (28) is connected to the third laser diode (29) through a wire, the second wavelength division multiplexer (28) is further connected to the third gain fiber (30) through a wire, and the third gain fiber (30) is connected to the first oscilloscope (12).
4. 4. The pulse ultrafast measurement method based on the time domain amplification method is realized by adopting the pulse ultrafast measurement system based on the time domain amplification method as claimed in claim 3, and is characterized by comprising the following steps of: Step 1, a reference pulse generating device (1) outputs a reference pulse with the frequency omega f to pass through a first dispersion compensating optical fiber (2) with the total dispersion D 1 , and a signal (6) to be detected with the frequency omega s to pass through a second dispersion compensating optical fiber (7) with the total dispersion D 2 , wherein the dispersion relation between the first dispersion compensating optical fiber (2) and the second dispersion compensating optical fiber (7) is D 1 /D 2 =2; Step 2, after the reference pulse passes through the first pulse amplifying device (3) and the pulse shaping device (4), the reference pulse and the signal to be detected (6) are combined into a path through the first optical fiber coupler (5), and four-wave mixing effect is generated after the combined beam passes through the high nonlinear optical fiber (8) to generate idler frequency light with the frequency of omega i =2ω f -ω s , wherein the optical path comprises three parts of reference light omega f , signal light omega s and idler frequency light omega i ; And 3, filtering the reference light omega f and the signal light omega s by using a first filter (9), and only reserving the idle frequency light omega i part, wherein the idle frequency light omega i passes through a third dispersion compensation optical fiber (10) with total dispersion of D 3 , the idle frequency light omega i subjected to dispersion broadening amplifies energy by using a second power amplifying device (11) and then is input into a first oscilloscope (12) to obtain the time domain shape of the amplified signal light omega s to be detected, and the ratio of the time domain width of the idle frequency light omega i to the time domain width of the signal light omega s is M=D 3 /D 2 .

Description

Pulse ultrafast measurement system and method based on time domain amplification method Technical Field The invention belongs to the technical field of phase ultrafast detection, and particularly relates to a pulse ultrafast measurement system based on a time domain amplification method, and a pulse ultrafast measurement method based on the time domain amplification method. Background Ultrafast phenomena are widely present in atomic molecular physics, particularly transient processes often involved in modern scientific research, such as ultrashort pulses generated by lasers, interaction processes between strong light and substances, photosynthesis processes and chemical reaction processes of plants, etc., and occur for a period of time in the picosecond, femtosecond or even attosecond range. The interaction between ultra-fast lasers and various substances has entered the field of intense fields where highly nonlinear and relativistic dominates. The transient dynamics process of ultra-fast laser and the transient dynamics process of interaction with various substances will show a series of brand new physical phenomena, and it is important to find and detect new phenomena in the ultra-fast processes, establish relevant new theories and reveal new rules. The pump detection method is based on the fact that laser flashes at a speed of several hundred parts per billion seconds to detect ultra-fast processes, and has high requirements on a detection system. The time domain amplifying method is to process the ultrashort pulse laser carrying information to realize detection with higher speed and higher precision. The time domain amplifying method compresses or amplifies the random waveform pulse signal and keeps the envelope of the output signal consistent with the envelope of the input signal. In the time domain amplifying method, pump light and signal light are stretched by a dispersion optical fiber and then enter a nonlinear waveguide to generate a four-wave mixing effect. However, in order to achieve high four-wave mixing efficiency, the pump light and the signal light must satisfy strict phase matching conditions. Meanwhile, in the four-wave mixing process, self-phase modulation, cross-phase modulation and group velocity dispersion which always exist are often accompanied, so that the influence of noise on output and frequency light becomes serious and even signal distortion is caused. How to reduce the influence of the uncorrelated nonlinear effects and dispersion is a key to realize high-precision ultrafast laser time domain detection. Disclosure of Invention The invention aims to provide a pulse ultrafast measurement system based on a time domain amplification method, which can amplify time domain information of a signal to be measured without distortion and has strong anti-interference capability. It is another object of the invention to provide a pulsed ultrafast measurement method based on a time-domain amplification method. The pulse ultrafast measurement system based on the time domain amplification method comprises a reference pulse generation device, wherein the reference pulse generation device is sequentially connected with a first dispersion compensation optical fiber, a first power amplification device and a pulse shaping device through wires, the pulse shaping device is connected with a beam combiner through wires, the beam combiner is sequentially connected with a high-nonlinearity optical fiber, a first filter, a third dispersion compensation optical fiber, a second power amplification device and a first oscilloscope through wires, and the pulse ultrafast measurement system further comprises a signal to be measured, the signal to be measured is connected with a second dispersion compensation optical fiber through wires, and the second dispersion compensation optical fiber is connected with the beam combiner through wires. The reference pulse generating device comprises a first laser diode, a hybrid integrated device and a first gain optical fiber, wherein the first laser diode is connected with the hybrid integrated device through a wire, the hybrid integrated device is connected with the first gain optical fiber through a wire, the first gain optical fiber is connected with the first laser diode through a wire, and the hybrid integrated device is also connected with the first dispersion compensation optical fiber. The pulse shaping device comprises a second filter, a first optical fiber coupler, a sound and light rejection filter, a spectrometer, a second optical fiber coupler, a tunable time delay line and a second oscilloscope, wherein the second filter is connected with the first optical fiber coupler through a wire, the first optical fiber coupler is respectively connected with the sound and light rejection filter and the spectrometer through a wire, the sound and light rejection filter is connected with the second optical fiber coupler through a wire, the second optical fiber coupler is