Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-power frequency-doubled single-frequency laser generator with phase modulation and demodulation

A phase modulation, single-frequency laser technology, used in lasers, laser parts, phonon exciters, etc., can solve the problems of frequency-doubling lasers that cannot obtain single-frequency, destroy the narrow linewidth characteristics of lasers, etc., and achieve flexible and lightweight design. , Wide practical value, good beam quality effect

Active Publication Date: 2022-04-01
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the linewidth of the single-frequency or narrow-linewidth laser needs to be broadened in the phase modulation process before being amplified, the narrow linewidth characteristics of the laser are destroyed to a certain extent, and the laser linewidth will continue to widen after frequency doubling. This method generally cannot obtain single-frequency frequency-doubled lasers, and many high-end applications require single-frequency frequency-doubled lasers

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
  • High-power frequency-doubled single-frequency laser generator with phase modulation and demodulation
  • High-power frequency-doubled single-frequency laser generator with phase modulation and demodulation
  • High-power frequency-doubled single-frequency laser generator with phase modulation and demodulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The single-frequency laser 1 is a distributed Bragg reflection (DBR) fiber laser with a center wavelength of 1120 nm and a line width of 10 MHz; the signal generator 3 uses a radio frequency signal source to generate two sinusoidal signals, one with a frequency of 1.6 GHz and a phase of 0°, The output power is 23dBm, the other frequency is 1.6GHz, the phase is -91° or 269°, and the output power is 29dBm; the first phase modulator 2 is an electro-optic phase modulator; the fiber amplifier 4 is a Raman fiber amplifier, and its gain fiber is a silica fiber ; The frequency doubling crystal 612 is periodically poled lithium niobate (PPLN); the second phase modulator 7 is a spatial electro-optic phase modulator. The central wavelength of the single-frequency laser 1 can also be any wavelength within the range of 1-2 μm. The frequency doubling crystal 612 may also be PPSLT, PPKTP, KTP, KDP, BBO, CLBO, or LBO. The gain fiber of the optical fiber amplifier 4 can also be a phosp...

Embodiment 2

[0063] The single-frequency laser 1 is an external cavity semiconductor (ECDL) laser with a central wavelength of 1178nm and a line width of 1MHz, which is loaded with an external radio frequency signal; the signal generator 3 uses a radio frequency signal source to generate two periodic sinusoidal signals, one with a frequency of 1.6GHz and a phase of 0°, the output power is 23dBm, another frequency is 1.6GHz, the phase is -99° or 260°, the output power is 29dBm; the first phase modulator 2 is an electro-optic phase modulator; the fiber amplifier 4 is a Raman fiber amplifier, and its gain fiber It is a phosphate optical fiber; the frequency doubling crystal 626 is a lithium triborate crystal (LBO); the digital lock cavity servo system based on FPGA adopts the PDH lock cavity technology, loads a 12MHz radio frequency signal on the single frequency laser, and outputs a triangle wave, which is high voltage After the amplifying module is amplified, the piezoelectric ceramic PZT is...

Embodiment 3

[0065] The single-frequency laser 1 is a distributed Bragg reflection (DBR) fiber laser with a central wavelength of 1064nm and a linewidth of less than 100kHz; the signal generator 3 uses a square wave signal source to generate two periodic square wave signals, one with a frequency of 100MHz and a phase of 0 °, the output power is 17dBm, another frequency is 100MHz, the phase is -100° or 260°, and the output power is 23dBm; the first phase modulator 2 is an electro-optic phase modulator; the fiber amplifier 4 is a rare earth doped fiber amplifier, and its gain fiber is Neodymium-doped optical fiber; the frequency doubling crystal 612 is periodically polarized stoichiometric lithium tantalate (PPSLT); the second phase modulator 7 is a spatial electro-optic phase modulator. The central wavelength of the single-frequency laser 1 can also be any wavelength within the range of 1-2 μm. The frequency doubling crystal 612 can also be PPLN, PPKTP, KTP, KDP, BBO, CLBO or LBO, etc. The...

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

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
wavelengthaaaaaaaaaa
wavelengthaaaaaaaaaa
Login to View More

Abstract

A high-power frequency-doubled single-frequency laser generator for phase modulation and demodulation, comprising: a single-frequency laser (1), a first phase modulator (2), an optical fiber amplifier (4), and a space isolator (5) connected in sequence , a frequency multiplying device (6) and a second phase modulator (7), and also includes a signal generator (3). It is characterized in that: the signal generator (3) generates two periodic signals with the same shape and frequency, which drive the first phase modulator (2) and the second phase modulator (7) respectively, two periods The phase difference of the sex signal is nπ-Δφ, n is an odd number, and Δφ is the phase delay generated by laser transmission amplification between the second phase modulator (7) and the first phase modulator (2), and the second phase modulator (7) The modulation depth of is twice that of the first phase modulator (2). Phase modulation of single-frequency fundamental-frequency light produces multi-single-frequency fundamental-frequency light, which improves the laser SBS threshold. After amplification and frequency doubling, high-power multi-single-frequency doubled light is obtained, and the phase of frequency-doubled light is demodulated to obtain high-power single-frequency doubled light. frequency light. This scheme enables the single-frequency laser to have the double-frequency linewidth characteristic before phase modulation, and also has the characteristics of simple and flexible structure and good beam quality. It provides a new scheme for high-power single-frequency laser frequency doubling, and has important practical value.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a high-power frequency-multiplied single-frequency laser generating device for phase modulation and demodulation. Background technique [0002] Visible light lasers have important applications in detection, communication, medical detection and treatment, industrial processing, and cold atoms. Fiber laser frequency doubling technology mainly obtains high-power visible and ultraviolet lasers through single-pass frequency doubling and resonance frequency doubling. In laser frequency doubling, to achieve high nonlinear conversion efficiency, the fundamental frequency light is required to be a single-frequency or narrow-linewidth laser. As the power of single-frequency, narrow-linewidth fiber laser increases, due to the small cross-sectional area of ​​the fiber core and the long interaction distance, it is easy to cause various nonlinear effects, especially stimulated Brillou...

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): H01S3/067H01S3/10H01S3/109H01S3/115
CPCH01S3/115H01S3/10053H01S3/109H01S3/06754H01S3/06712
Inventor 冯衍曾鑫崔淑珍
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com