Spectrometer calibration spectral line generator and generation method thereof

A spectrometer and generator technology, applied in the field of spectrometer calibration spectral line generator and its generation, can solve the problems of difficult spectrum expansion, low efficiency of Ti:sapphire amplifier, limited output power of Ti:sapphire laser, etc. Effect

Pending Publication Date: 2020-03-06
PEKING UNIV
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Problems solved by technology

The main disadvantage is that the output power of high repetition rate femtosecond Ti:Sapphire laser is li

Method used

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  • Spectrometer calibration spectral line generator and generation method thereof
  • Spectrometer calibration spectral line generator and generation method thereof

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Embodiment 1

[0045] Such as figure 1As shown, the spectrometer calibration spectral line generator of this embodiment includes: a high repetition rate femtosecond fiber laser 1, a first fiber coupler 2 and a second fiber coupler 4, a spread spectrum nonlinear fiber 3, and a frequency offset locking device 5. The first two-color beam splitter 6 to the Nth two-color beam splitter, the first isolator 8 to the Nth isolator, the first ultrastable Fabry-Perot cavity 9 to the Nth ultrastable Fabry-Perot cavity , a vacuum chamber 12 and the first reflector 13 to the Nth reflector; wherein, the high repetition rate femtosecond fiber laser emits laser pulses with high power and high repetition rate, and the repetition rate is above 1 GHz; the high repetition rate laser pulses directly pass through the first The fiber coupler enters the spread-spectrum nonlinear fiber; the spread-spectrum nonlinear fiber spreads the spectrum of the laser pulse to widen the spectrum; in order to separate different spe...

Embodiment 2

[0047] Such as figure 2 As shown, in this embodiment, taking N=2, that is, two ultra-stable Fabry-Perot cavities as an example, the spectrometer calibration spectral line generator includes: a high repetition rate femtosecond fiber laser 1, a first fiber coupler 2. The second fiber coupler 4, the spread spectrum nonlinear fiber 3, the frequency offset locking device 5, the first two-color splitter 6, the second two-color splitter 7, the first isolator 8, the second isolator 10, the first Ultrastable Fabry-Perot cavity 9, a second ultrastable Fabry-Perot cavity 11, a vacuum cavity 12, and first and second mirrors 13 and 14; wherein, the high repetition rate femtosecond fiber laser 1 emits The laser pulse with high power and high repetition frequency has a repetition frequency above 1 GHz; the high repetition frequency laser pulse directly enters the spread-spectrum nonlinear fiber 3 through the first fiber coupler 2; the spread-spectrum nonlinear fiber 3 converts the spectrum ...

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Abstract

The invention discloses a spectrometer calibration spectral line generator and a generation method thereof. A high-repetition-frequency femtosecond fiber laser is adopted, the output power is high, the pulse is short, a super-continuum spectrum is directly generated in a photonic crystal fiber, and the system is simplified; another set of device required for generating an octave spectrum is omitted, so that the system is further simplified; the side mode rejection ratio after filtering of an ultra-stable cavity is high, the noise is low, and distinguishing in a spectrograph is facilitated; asthe light of different spectral bands is subjected to ultra-stable cavity filtering and frequency interval multiplication in different spectrum elimination intervals at the same time, calibration spectra of different bands and different frequency intervals can be obtained at the same time, the spectra can be clearly distinguished in the whole spectrograph detection interval, and the enough numberof calibration spectral lines are provided; and a spectrum flattening reflector is adopted, a common device of a grating and a spatial modulator is omitted, the reflector eliminates too high spectrumcomponents, space and cost are saved, and stability and operability of the system are also improved.

Description

technical field [0001] The invention relates to a mode-locked fiber laser and spectrum calibration technology, in particular to a spectrometer calibration spectrum line generator and a generation method thereof. Background technique [0002] The application of femtosecond laser frequency combs in the field of spectroscopy is gradually expanding, and the calibration function of resolvable frequency comb teeth (calibration lines) in spectrometers is being explored. For example, in astronomical spectroscopy, the conventional thorium-argon lamp or iodine absorption cell calibration technology is limited by the inhomogeneity of the intensity and interval of the calibration spectral lines, and cannot provide a resolution below the radial velocity of 1m / s; On the other hand, the femtosecond laser frequency comb calibration instrument is considered as a new generation of calibration light source because of its equal frequency interval (comb tooth interval) and evenly distributed spe...

Claims

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Application Information

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IPC IPC(8): G01J3/26G01J3/28G01J3/02
CPCG01J3/0218G01J3/0297G01J3/26G01J3/28G01J2003/2873
Inventor 张志刚马宇轩孟飞杨若傲韩伟王爱民
Owner PEKING UNIV
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