Unlock instant, AI-driven research and patent intelligence for your innovation.

Fiber laser-pumped solid-state Raman frequency-shifted 589nm sodium beacon laser

A 589nm, Raman frequency shift technology, applied in the field of lasers, can solve the problems of difficult wavelength tuning, inability to accurately match the energy level and absorption bandwidth of the sodium beacon D2 transition, and the line width is not easy to compress.

Active Publication Date: 2020-10-23
TIANJIN UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a 589nm sodium beacon laser pumped by a fiber laser pumped by a solid-state Raman frequency shift. The invention utilizes the wide-gain spectrum characteristics of a doped fiber glass matrix and combines the SRS frequency shift of a crystal Raman medium to achieve a narrow linewidth The 589.159nm single longitudinal mode sodium beacon laser overcomes the problems that the wavelength of the existing solid Raman yellow light source is difficult to tune, and the line width is not easy to compress, so it cannot accurately match the energy level and absorption bandwidth of the D2 transition of the sodium beacon. For details, see Described below:

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fiber laser-pumped solid-state Raman frequency-shifted 589nm sodium beacon laser
  • Fiber laser-pumped solid-state Raman frequency-shifted 589nm sodium beacon laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An embodiment of the present invention provides a 589nm sodium beacon laser pumped by a fiber laser pumped by a solid-state Raman frequency shift. The laser includes: a fundamental frequency laser seed source 1-1, an optical fiber amplifier stage 1-2, and a Raman crystal BaWO 4 2. The first Stokes cavity mirror 3-1, the second Stokes cavity mirror 3-2, the frequency doubling crystal LBO 4, and the focusing lens 5;

[0038] Among them, the fundamental frequency laser seed source 1-1 is a single-mode fiber-coupled semiconductor laser, the wavelength is tunable in the range of 1060-1070nm, and the spectral linewidth is <0.1nm; the fiber amplifier stage 1-2 uses Yb-doped fiber as the active fiber , the fundamental-frequency laser seed source 1-1 and the fiber amplifier stage 1-2 constitute the fundamental-frequency laser light source (i.e. the fundamental-frequency laser 1); the first Stokes cavity mirror 3-1 is coated with fundamental-frequency laser anti-reflection, Si S...

Embodiment 2

[0044] An embodiment of the present invention provides a fiber laser pumped solid-state Raman frequency-shifted 589nm sodium beacon laser, which includes: a fundamental frequency laser 1, a Raman crystal YVO 4 2. The first Stokes cavity mirror 3-1, the second Stokes cavity mirror 3-2, the frequency doubling crystal PPLN 4, the first focusing lens 5-1, and the second focusing lens 5-2.

[0045] Among them, the fundamental frequency laser 1 is a laser oscillator with Nd-doped fiber as the gain medium, and a narrow-band fiber grating is selected to make the fundamental frequency laser line width less than 0.1nm, and the fundamental frequency laser wavelength can be tuned through the stress and temperature control of the fiber grating; Stokes cavity mirror 3-1 is coated with fundamental frequency laser anti-reflection and Stokes light high reflection film system; the second Stokes cavity mirror 3-2 is coated with Stokes light partial output film system, The radius of curvature of...

Embodiment 3

[0049] In the above-mentioned embodiments 1 and 2, the active fiber of the fundamental frequency laser source 1 can be a Yb-doped fiber or an Nd-doped fiber, as long as it can provide a wide gain around 1.06 μm, the embodiment of the present invention does not care about this. Do limit.

[0050] Correspondingly, the Raman crystal 2 can be BaWO 4 , or YVO 4 , can also be CaWO 4 , BaNO 3 、GdVO 4 Commonly used Raman main peak frequency shift is 900cm -1 When implementing the Raman crystal nearby, it is sufficient to select the wavelength of the fundamental frequency light according to the frequency shift of the Raman crystal, which is not limited in the embodiment of the present invention.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a fiber laser pumping solid Raman frequency shift 589 nm sodium beacon laser. A Stokes optical resonance cavity mirror anti-reflects fundamental frequency light and highly reverses Stokes light. Two or more Stokes optical resonance cavity mirrors form a Stokes optical resonance cavity. A fiber fundamental frequency laser light source is in a main oscillatory-amplification structure or a single oscillator structure, so that the fundamental frequency light width is smaller than the spectral line width of Raman frequency shift. Fundamental frequency laser is incident on a Raman crystal. If the Raman gain is greater than loss, stimulated Raman scattering occurs under the feedback of the Stokes optical resonance cavity to form Stokes optical oscillation. According to theRaman frequency shift of the Raman crystal, the wavelength of the fundamental frequency light is selected, so that the wavelength of the Stokes light acquired through Raman frequency shift is 1738.318nm. Combined with the characteristic of hole burning preventing of the Raman gain, the Stokes light of the single longitudinal mode is acquired. The Stokes light of 1178.318 nm is subjected to frequency doubling of a frequency doubling crystal to output sodium beacon yellow light of 589.159 nm.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a 589nm sodium beacon laser pumped by a fiber laser pumping a solid-state Raman frequency shift. Background technique [0002] Sodium beacon yellow light, also known as sodium guide star yellow light, has a wavelength of 589.159nm, a narrow linewidth yellow light source corresponding to the D2 transition of sodium ions, and has an irreplaceable and important use in the field of adaptive optics. At present, the yellow light of sodium beacon mainly depends on the 1064nm and 1319nm laser sum frequency of Nd:YAG laser, and the frequency doubling of fiber Raman laser pumped by 1120nm fiber laser, both of which involve factors such as multi-stage amplification and gain control, and the system is complicated , the technical threshold is very high. [0003] The main peak of Raman frequency shift of most crystals is at 800-1000cm -1 Within the range, the most mature 1.06μm laser can be efficiently...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/10H01S3/30H01S3/067
CPCH01S3/06716H01S3/10H01S3/30
Inventor 盛泉马汉超刘璐史伟丁欣姚建铨
Owner TIANJIN UNIV