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High-brightness ultra-wideband medium infrared super-continuum spectrum light source

An ultra-infrared and ultra-broadband technology, applied in the field of laser optoelectronics, can solve problems such as the difficulty in obtaining mid-infrared supercontinuum light sources, and achieve the effect of good spectral flatness

Active Publication Date: 2016-04-06
广州米德红外科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that it is difficult to obtain a mid-infrared supercontinuum light source covering 2-12 μm and with an average power greater than 20mW in the prior art, the present invention provides a high-brightness ultra-broadband mid-infrared supercontinuum light source

Method used

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  • High-brightness ultra-wideband medium infrared super-continuum spectrum light source

Examples

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Effect test

Embodiment 1

[0022] Example 1: A MIRSC light source with an average power of 30 mW, a spectral range of 2-12 μm, and a spectral flatness of ±13 dB.

[0023] A step-index Ge-Sb-Se / Ge-Se selenide optical fiber 11 with a core diameter of 10 μm, a cladding diameter of 400 μm, a numerical aperture of 0.9, and a length of 14 cm is used as the nonlinear medium for generating MIRSC, and the repetition frequency is 30MHz, OPA with a center wavelength of 4.586μm and a pulse width of 330fs is used as a pumping light source. When the average pumping power is 120mW, a MIRSC with an average power of 30mW, a spectral range of 2-12μm, and a spectral flatness of ±13dB is obtained. light source.

[0024] The specific method is: first calculate the group velocity dispersion of the fiber according to the parameters of the step index Ge-Sb-Se / Ge-Se selenide fiber 11 (core and cladding size and refractive index), and obtain its zero dispersion wavelength of 4.5 μm; then according to the zero dispersion wavelen...

Embodiment 2

[0025] Example 2: MIRSC light source with an average power of 25mW, a spectral range of 2-12μm, and a spectral flatness of ±12dB

[0026] A step-index Ge-Sb-Se / Ge-Se selenide fiber 11 with a core diameter of 7.5 μm, a cladding diameter of 300 μm, a numerical aperture of 1.0, and a fiber length of 12 cm is used as the nonlinear medium, and the repetition frequency is 25 MHz , OPA with a center wavelength of 3.964μm and a pulse width of 320fs is the pumping light source. When the average pump power is 100mW, a MIRSC light source with an average power of 25mW, a spectral range of 2-12μm, and a spectral flatness of ±12dB is obtained. .

[0027] The specific method is: first calculate the group velocity dispersion of the fiber according to the parameters of the step index Ge-Sb-Se / Ge-Se selenide fiber 11 (core and cladding size and refractive index), and obtain the zero dispersion wavelength of the fiber as 3.9 μm; then according to the zero dispersion wavelength of the optical fi...

Embodiment 3

[0028] Example 3: MIRSC light source with an average power of 21mW, a spectral range of 2-12μm, and a spectral flatness of ±10dB

[0029] A step-index Ge-Sb-Se / Ge-Se selenide optical fiber 11 with a core diameter of 5 μm, a cladding diameter of 200 μm, a numerical aperture of 1.3, and a fiber length of 18 cm is used as the nonlinear medium, and the repetition frequency is 21 MHz, The OPA with a center wavelength of 3.8 μm and a pulse width of 350 fs was used as a pumping light source. When the average pump power was 85 mW, a MIRSC light source with an average power of 21 mW, a spectral range of 2-12 μm, and a spectral flatness of ±10 dB was obtained.

[0030] The specific method is: first calculate the group velocity dispersion of the fiber according to the parameters of the step index Ge-Sb-Se / Ge-Se fiber 11 (core and cladding size and refractive index), and obtain the zero dispersion wavelength of the fiber as 3.7 μm; Then according to the zero dispersion wavelength of the o...

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Abstract

The invention relates to a high-brightness ultra-wideband medium infrared super-continuum spectrum light source. A femtosecond optical parametric amplifier (OPA), a space coupling device and selenide optical fiber are sequentially arranged along a light path direction, the femtosecond OPA comprises a femtosecond mode locking Yb laser, a continuous tuning semiconductor laser, a one second wave plate, a two-tone beam splitter, an achromatic doublet lens, a temperature control device, a periodically poled lithium niobate crystal, an infrared lens and a long-wave germanium-through optical filter, the space coupling device comprises two pieces of infrared lens and a three-dimensional adjustment rack, the selenide optical fiber is arranged on the three-dimensional adjustment rack between the two pieces of infrared lens, and the three-dimensional adjustment rack is used for fixing the optical fiber. By the high-brightness ultra-wideband medium infrared super-continuum spectrum light source, medium infrared super-continuum spectrum output with average power more than 20mW, a spectral range covering 2 to 12 micrometers and high spectrum flatness can be acquired, and the brightness of the high-brightness ultra-wideband medium infrared super-continuum spectrum light source is improved than a synchrotron-radiation medium infrared light source by two orders of magnitude.

Description

technical field [0001] The invention relates to a mid-infrared light source, in particular to a high-brightness ultra-broadband mid-infrared supercontinuum light source, belonging to the technical field of laser optoelectronics. Background technique [0002] The mid-infrared (MIR) supercontinuum (SC) light source has the advantages of wide spectrum, good spatial coherence, and high brightness, so it is very important in the fields of molecular spectroscopy, biomedical imaging, optical measurement, and broadband lidar. application. Common broadband mid-infrared light sources currently include hot rods, synchrotron radiation sources, and new quantum cascade lasers (QCL). Among them, the synchrotron radiation source can produce 10 16-17 photons / s / mm 2 / sr / cm -1 The brightness is 2-3 orders of magnitude higher than that of a hot rod. MIR spectroscopy detection with high signal-to-noise ratio and high spatial resolution can only use synchrotron radiation light sources with h...

Claims

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Application Information

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IPC IPC(8): H01S3/0941G02F1/35
CPCG02F1/35G02F1/3528H01S3/0941
Inventor 张斌杨志勇李雷翟诚诚祁思胜任和杨安平唐定远
Owner 广州米德红外科技有限公司
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