Polarization combination nonlinear rotary mode locking method

A technology of polarization beam combining and polarization rotation, which is applied in the laser field, can solve the problems of limited energy of mode-locked laser pulses, unfavorable compressed pulses, and large carrier envelope phase shift, so as to avoid pulse modulation instability and reduce high-order Non-linear effect, the effect of avoiding the splitting of the pulse

Active Publication Date: 2014-08-06
CHONGQING HUAPU INTELLIGENT EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Saturable absorber mode-locking has a simple structure and can be self-mode-locked, but the obtained pulse is easy to split and has high noise, and the saturable absorber cannot withstand high peak power, and long-term mode-locking will also cause damage to the saturable absorber
The mode-locked pulsed laser using nonlinear polarization rotation mode-locking technology has poor mode-locking stability due to the nonlinear effect of light and is easily affected by the environment; laser pulse amplification is carried out in the gain medium, resulting in easy pulse splitting and poor modulation. Stability, highly susceptible to high-order nonlinear effects, is not conducive to obtaining very clean compressed pulses, the main peak of the output pulse is usually accompanied by a larger side-lobe pulse; the polarization direction of the amplified laser mode in the gain medium is uncertain, The control of the laser cavity mode is very difficult, and the competition between different polarization modes usually brings additional gain noise, the random jitter of polarization due to environmental interference is difficult to control, and the stability of the output laser pulse is generally difficult to improve, and the corresponding time domain-frequency The domain noise is large, and the phase shift of the carrier envelope of the output pulse is relatively large; limited by the damage threshold of the laser gain medium, the energy of the obtained mode-locked laser pulse is limited; It is lower than usual, and it is easily affected by amplified spontaneous emission continuous light in the gain medium, and the obtained pulse contrast is generally not high
Due to the existence of the above factors, the development of nonlinear polarization rotation mode-locked lasers is restricted

Method used

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  • Polarization combination nonlinear rotary mode locking method
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  • Polarization combination nonlinear rotary mode locking method

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Embodiment 1

[0039] refer to figure 2 , this figure is a schematic diagram of a polarization beam combining nonlinear rotation mode-locked solid-state laser using birefringent crystal separation and broadening in the present invention. The polarization rotation reflection part 100 includes a polarization beam splitter 101, polarization maintaining fiber couplers 103 and 105, High power isolator 102, polarization maintaining fiber 104. The working wavelength of the polarization-maintaining fiber couplers 103 and 105 is preferably 1064 nm, the polarization beam splitter 101 uses a polarization beam splitter, and the angle between the slow axis of the polarization-maintaining fiber coupler 103 and the incident plane is preferably 15 degrees. The working band of the high power isolator 102 and the polarization maintaining fiber 104 is preferably 1064nm. The beam combining part of the pulse polarization separation includes three groups of birefringent crystal groups 201 , 202 and 203 whose le...

Embodiment 2

[0042] refer to Figure 4 , this figure is a schematic diagram of a polarization-combining nonlinear rotation mode-locked fiber laser using a polarization beam splitter to separate and broaden the present invention. The polarization rotation reflection part includes a polarization beam splitter 101, a high-power isolator 102, and a polarization-maintaining fiber Coupler 103, polarization maintaining fiber 104. The working wavelength of the polarization-maintaining fiber coupler 103 is preferably 1064nm, and the polarization beam splitter 101 is a fiber optic polarization beam splitter with a 2×2 structure, and the working wavelength is preferably 1064nm. The length of the polarization maintaining fiber 104 is preferably 70 cm. The included angle between the output end of the polarization maintaining fiber 104 and the slow axis when the upper port of the polarization beam splitter 101 is fused is preferably 70 degrees. The working wavelength band of the high power isolator 10...

Embodiment 3

[0045] refer to Figure 5 , this figure is a schematic diagram of a polarization-combining nonlinear rotation mode-locked fiber laser that adopts a birefringent crystal and a polarization beam splitter to separate and broaden in the present invention. The polarization rotation reflection part includes a polarization beam splitter 101, a high-power isolation Device 102, polarization maintaining fiber coupler 103, polarization maintaining fiber 104. The working wavelength of the polarization-maintaining fiber coupler 103 is preferably 1550 nm, and the polarization beam splitter 101 is a fiber polarization beam splitter with a 2×2 structure, and the working wavelength is preferably 1550 nm. The length of the polarization maintaining optical fiber 104 is preferably 50 cm. The included angle between the output end of the polarization-maintaining fiber 104 and the slow axis when the upper port of the polarization beam splitter 101 is fused is preferably 60 degrees. The operating w...

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Abstract

The invention discloses a polarization combination nonlinear rotary mode locking method. The method is characterized in that the nonlinear polarization rotary mode locking is adopted, the mode-locking pulse formed in a laser cavity is firstly separated in a pulse polarization manner, then the pulse is separated and broadened, the separated low-peak-value power pulse is magnified by virtue of gain medium, the magnified pulse is returned to be magnified for the second time after being reflected by virtue of a faraday rotator mirror, and finally the pulse is combined to obtain the pulse with high peak value power; the pulse is repeatedly and circularly magnified in the laser cavity, and the obtained laser pulse with high energy is outputted through a coupling output device. By adopting the method, the high-energy mode-locking pulse which is stably outputted can be obtained.

Description

technical field [0001] The invention belongs to the technical field of lasers, and relates to a method for nonlinear rotation mode-locking of polarization beam combining. Background technique [0002] Due to its various advantages, such as narrow output pulse width, high peak power, and wide spectral range, mode-locked pulsed lasers are widely used in information processing, communications, laser spectroscopy, Internet, and optical holography. There are many ways to obtain ultrashort pulse mode-locked lasers, common ones include saturable absorber technology mode-locking and nonlinear polarization rotation mode-locking, etc. Saturable absorber mode-locking has a simple structure and can be self-mode-locked, but the obtained pulse is easy to split and has high noise, and the saturable absorber cannot withstand high peak power, and long-term mode-locking will also cause damage to the saturable absorber . The mode-locked pulsed laser using nonlinear polarization rotation mode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098H01S3/101H01S3/067
Inventor 曾和平李浪
Owner CHONGQING HUAPU INTELLIGENT EQUIP CO LTD
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