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Method for shortening pulse and obtaining adjustable picosecond pulse

A second pulse and pulse technology, which is applied in the field of shortening pulses and obtaining adjustable picosecond pulses, can solve the problems of complex structure and high cost, and achieve the effect of small size, low cost and good application prospects

Inactive Publication Date: 2019-10-25
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although shorter picosecond pulses can also be obtained by means of chirp compensation and pulse compression, the structures of these methods are also relatively complex and costly

Method used

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  • Method for shortening pulse and obtaining adjustable picosecond pulse
  • Method for shortening pulse and obtaining adjustable picosecond pulse
  • Method for shortening pulse and obtaining adjustable picosecond pulse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 Shown is a structural schematic diagram of a specific embodiment of the present invention.

[0023] The pumping source in this embodiment is an electric pulse generator with adjustable pulse width, pulse amplitude and repetition frequency.

[0024] The laser in this embodiment is a 980nm GaAs-based single-mode gain switch DBR-LD capable of high-speed modulation.

[0025] The filter element in this embodiment is a narrow channel bandpass filter.

[0026] First, modulate the electrical pulse generator to generate a square wave electrical pulse of 0.6 nanoseconds and 5 volts, and then pump the laser to generate pulsed laser light with chirped pulse components and steady-state pulse components. The wavelength range is 976.5 nm to 980.3 nm. Select a filter with a center wavelength of 978 nm and a bandwidth of 1 nm, and obtain short-wave laser light after the laser is filtered by the filter of the II optical path.

[0027] The half-maximum width (FWHM) of...

Embodiment 2

[0029] Such as figure 2 Shown is a structural schematic diagram of a specific embodiment of the present invention.

[0030] The pumping source in this embodiment is an electric pulse generator with adjustable pulse width, pulse amplitude and repetition frequency.

[0031] The laser in this embodiment is a 1550nm InGaAsP multi-quantum well single-mode gain switch DFB-LD capable of high-speed modulation.

[0032] The fiber waveguide in this embodiment is a single-mode fiber.

[0033] The filter in this embodiment is an adjustable narrowband bandpass filter with a bandwidth of 1 nanometer.

[0034] In this embodiment, an erbium-doped fiber amplifier EDFA is used to amplify and filter the optical pulses, thereby compensating for the previous loss of light intensity.

[0035] First, the electric pulse generator is modulated to generate a 3.1 volt square wave electric pulse with a duration of 0.6 nanoseconds. After the pump laser is pumped, a pulsed laser with a chirped pulse co...

Embodiment 3

[0038] The pumping source in this embodiment is an electric pulse generator with adjustable pulse width, pulse amplitude and repetition frequency.

[0039] The laser in this embodiment is a 1310nm InGaAsP multi-quantum well single-mode gain switch VCSEL capable of high-speed modulation.

[0040] In this embodiment, a semiconductor optical amplifier (SOA) is used to amplify the pulse laser before filtering to ensure the output laser power.

[0041] The fiber waveguide in this embodiment is a single-mode fiber.

[0042] The filter in this embodiment is an adjustable narrow band pass filter with a bandwidth of 1 nanometer.

[0043] First, the modulated electrical pulse generator generates a 4-volt square-wave electrical pulse with a duration of 0.6 nanoseconds, and excites a gain-switched semiconductor laser. The laser generates pulsed laser light with chirped pulse components and steady-state pulse components, and the filtered wavelength range measured by the spectrometer is 1...

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Abstract

The invention discloses a method for shortening a pulse and obtaining an adjustable picosecond pulse, which comprises the steps of firstly modulating a pumping source to generate an optical pulse or an electric pulse to excite a gain switch type semiconductor laser, generating pulse laser with a chirp pulse component and a steady-state pulse component, then leading the pulse laser to a filter element through a light path, and obtaining short wave laser or long wave laser after filtering treatment, wherein the short wave laser is from the initial pulse component, has extremely short pulse widthcan achieve the purpose of shortening the pulse, and the filtering parameters are adjusted to change the wavelength and the pulse width of the short wave pulse laser so as to achieve pulse adjustment. The method can be applied to a single-mode gain switch semiconductor laser. Compared with common methods such as chirp compensation and pulse compression, the method has the advantages of simplicity, high feasibility and low cost, can conveniently obtain the adjustable picosecond pulse with high spectral purity, narrow optical pulse width and weak pulse jitter, combines the technologies such asoptical amplification and wavelength transfer, and can be applied to many fields such as multiphoton imaging and time resolution spectrum.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to a method for obtaining picosecond adjustable short pulses by combining a gain switch semiconductor laser with filtering technology, in particular to a method for shortening pulses and obtaining adjustable picosecond pulses. Background technique [0002] Picosecond laser pulse has the characteristics of picosecond-level narrow pulse width and high peak power, so it has important application value in biological detection, medical treatment, microfabrication, high-speed optical communication system, optical information processing, multiphoton imaging and some basic research fields . The most common method for generating picosecond pulsed lasers is the mode-locking technique. Mode-locking technology is a technique for obtaining ultrashort pulses by fixing the phase of each longitudinal mode in the laser cavity and enhancing coherence. Although the mode-locking technology can realize u...

Claims

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Application Information

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IPC IPC(8): H01S5/00
CPCH01S5/0057H01S5/0078H01S5/0085
Inventor 陈少强陈宇豪翁国恩胡小波
Owner EAST CHINA NORMAL UNIV
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