Single end-pumped high-power narrow-pulse fundamental mode laser and working method thereof

A working method and high-power technology, applied to lasers, laser components, semiconductor lasers, etc., can solve problems such as reducing peak power frequency doubling, triple frequency conversion efficiency, increasing component surface film damage, and reducing laser service life. Achieve the effects of improving nonlinear conversion efficiency, avoiding complex structural problems, and suppressing the generation of multi-mode

Inactive Publication Date: 2018-08-03
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above-mentioned patents all have the following defects: 1. There are three resonant cavity arms, which increases the length of the resonant cavity, increases the pulse width of the fundamental frequency light, and reduces its peak power and conversion efficiency of frequency do

Method used

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  • Single end-pumped high-power narrow-pulse fundamental mode laser and working method thereof
  • Single end-pumped high-power narrow-pulse fundamental mode laser and working method thereof

Examples

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Example Embodiment

[0036] Example 1

[0037] Such as figure 1 Shown.

[0038] In this embodiment, the pump power of the LD is 30W, the center wavelength is 808nm, the half-wave width is 2nm, the diameter of the pigtail core is 400um, and the numerical aperture NA=0.22. Laser crystal 103 is Nd:YVO 4 Crystal, both surfaces are coated with 808nm antireflection coating, 1064nm antireflection coating, crystal size is 3×3×12mm 3 , The doping concentration is 0.3%. The temperature of the crystal is controlled by TEC, and the temperature is controlled at 30°C. The curvature radius of the plano-convex lens 102 is 200mm, and the surface is coated with a 1064nm high-reflection and 808nm antireflection coating. The surface of the first flat mirror 105 is coated with a 1064nm high-reflection film and a 532nm high-reflection film. The frequency doubling crystal 107 is a type I phase matching LBO crystal, and the triple frequency crystal 106 is a type II phase matching LBO crystal. The temperature of the freque...

Example Embodiment

[0048] Example 2

[0049] A working method of a fundamental mode laser as described in embodiment 1, including the following steps:

[0050] 1) The pump source 101 generates pump light; the coupling lens group 101 couples the pump spot into the laser crystal 103, and single-end pumps the laser crystal 103 to generate fundamental frequency light; the coupling lens group 101 has a certain magnification ratio for the LD fiber output spot;

[0051] 2) The fundamental frequency light undergoes intracavity oscillation in the resonant cavity; the fundamental frequency light passes through the frequency doubling crystal 107 for frequency doubling conversion twice to obtain frequency doubling light; the frequency doubling light and the fundamental frequency The frequency light passes through the frequency triple crystal 106 at the same time for sum frequency, and the generated frequency triple light is output from the end of the frequency triple crystal 106 where the Brewster angle is set.

...

Example Embodiment

[0056] Example 3

[0057] According to the working method of the fundamental mode laser described in embodiment 2, further, in the step 2), it also includes the step of adjusting the angles of the second flat mirror 108, the frequency-doubling crystal 106 and the frequency-doubling crystal 107; The angle of the second flat mirror 108 obtains frequency-doubled light; by adjusting the angles of the frequency-doubling crystal 106 and the frequency-doubling crystal 107, the optical power output by the first flat mirror 105 is maximized.

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Abstract

The invention relates to a single end-pumped high-power narrow-pulse fundamental mode ultraviolet laser and a working method thereof. The laser includes a pump source, a coupling lens group, a plano-convex lens, a laser crystal, a Q-switching device, a first flat mirror, a triple frequency crystal, a frequency doubling crystal and a second flat mirror; one end face of the triple frequency crystalis cut into the brewster angle. The laser adopts plano-convex V-cavity design, which increases the internal mold volume of a resonant cavity and the number of inverted particles which can be utilizedin the laser crystal. The design can compensate for the thermal lens effect during high-power operation, so that the laser is in a stable region at high power, the stable running of the laser under the single-ended high power is achieved, and the volume and cavity length of the laser are reduced to facilitate narrow pulse output. The design of a plano-convex cavity is beneficial for suppressing multi-mode generation, the laser has a mode selection function, and the beam quality of fundamental light, frequency doubled light and ultraviolet light of the laser is improved.

Description

technical field [0001] The invention relates to a single-end pumped high-power narrow-pulse fundamental-mode laser and a working method thereof, belonging to the technical field of high-repetition-frequency pulse lasers and nonlinear optical frequency conversion. Background technique [0002] The end-pumped solid-state ultraviolet laser is generally pumped by a semiconductor laser (Laser Diode, LD) to pump Nd:YVO 4 Gain mediums such as crystals output fundamental frequency light, and then frequency doubling is performed by frequency doubling crystals such as LBO, and the remaining fundamental frequency light and frequency doubling light are summed by sum frequency crystals such as LBO to generate triple frequency ultraviolet laser. There are two main ways to convert fundamental frequency light to generate ultraviolet light: extra-cavity frequency conversion and intra-cavity frequency conversion. Extracavity frequency conversion uses a focusing system to focus fundamental fr...

Claims

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Application Information

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IPC IPC(8): H01S5/06H01S5/068H01S5/10
CPCH01S5/0604H01S5/068H01S5/10
Inventor 程文雍张立杰杨厚文李大振
Owner SHANDONG UNIV
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