Multipulse-induced spectroscopy method and device based on femtosecond plasma grating
AssigneesChongqing Institute of East China Normal University, East China Normal University, Yunnan Huapu Quantum Material Co., Ltd, Roi Optoelectronics Technology Co, Ltd., Chongqing Huapu Scientific Instrument Co., Ltd., Chongqing Huapu Intelligent Equipment Co., Ltd., Guangdong Roi Optoelectronics Technology Co., Ltd.
InventorsHeping Zeng, Mengyun Hu
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Abstract
A multipulse-induced spectroscopy method based on a femtosecond plasma grating includes: pre-exciting a sample on a stage by providing a femtosecond pulse to form the femtosecond plasma grating; providing a post-pulse on the sample at an angle to excite the sample to generate a plasma, wherein the post-pulse comprises one or more femtosecond pulses, there is a time interval between the femtosecond pulse and the post-pulse, and the time interval is less than a lifetime of the femtosecond plasma grating; and receiving and analyzing a fluorescence emitted from the plasma to determine element information of the sample.
Claims14
A multipulse-induced spectroscopy method based on a femtosecond plasma grating, comprising:
- pre-exciting a sample on a stage by providing a femtosecond pulse to form the femtosecond plasma grating;
- providing a post-pulse on the sample at an angle to excite the sample to generate a plasma, wherein the post-pulse comprises one or more femtosecond pulses, there is a time interval between the femtosecond pulse and the post-pulse, and the time interval is less than a lifetime of the femtosecond plasma grating;
- and
- receiving and analyzing a fluorescence emitted from the plasma to determine element information of the sample;
- wherein the method further comprises:
- splitting the femtosecond pulse into three sub-pulses;
- and
- adjusting an optical path of each of the three sub-pulses in such a way that a first pulse and a third pulse of the three sub-pulses have an optical path with a first length and arrive at the intersection in space simultaneously to form the femtosecond plasma grating, and a second pulse of the three sub-pulses has an optical path with a second length being different from the first length and arrives at the intersection in space after a preset time interval;
- wherein splitting the femtosecond pulse into three sub-pulses comprises:
- splitting the femtosecond pulse into the first pulse and a primary reflection light;
- and
- splitting the primary reflection light into the second pulse and the third pulse.
A multipulse-induced spectroscopy device based on a femtosecond plasma grating, comprising:
- a femtosecond laser configured to generate a femtosecond laser pulse;
- a beam splitting component configured to split the femtosecond laser pulse into three sub-pulses;
- a focusing component configured to focus the three sub-pulses to allow focused sub-pulses to be overlapped at an intersection in space;
- a time domain synchronization component configured to adjust an optical path of each of the three sub-pulses in such a way that a first pulse and a third pulse of the three sub-pulses have an optical path with a first length and arrive at the intersection in space simultaneously to form the femtosecond plasma grating, and a second pulse of the three sub-pulses has an optical path with a second length being different from the first length and arrives at the intersection in space after a preset time interval;
- a stage for supporting a sample;
- and
- a spectrum collection component configured to collect a spectrum signal emitted by sample excitation,
- wherein the beam splitting component comprises:
- a first beam splitter configured to split the femtosecond laser pulse into the first pulse and a primary reflection light;
- and
- a second beam splitter configured to split the primary reflection light into the second pulse and the third pulse.
Dependencies are inferred from the claim text.