Laser driving device and method for enabling uniform light field

1. A laser driving device, comprising:

a laser seed ( 1 ),

an amplification and transmission unit ( 2 ),

a frequency conversion unit ( 3 ), and

a focusing unit ( 4 ),

wherein the laser seed ( 1 ) is a narrow-band low-spatial-coherence light source with a bandwidth of no more than 5 Å and configured for generating a narrow-band low-spatial-coherence laser,

the amplification and transmission unit ( 2 ) is configured for amplifying and transmitting the laser, wherein the amplification and transmission unit ( 2 ) comprises one or more amplification gain media, and the amplification gain media are plate- or sheet-shaped,

the frequency conversion unit ( 3 ) is configured for converting frequencies of the laser, and

the focusing unit ( 4 ) is configured for laser focusing;

the laser seed ( 1 ) generates a narrow-band low-spatial-coherence light, the narrow-band low-spatial-coherence light is amplified by the amplification and transmission unit ( 2 ) and is subjected to frequency conversion performed by the frequency conversion unit ( 3 ), and then the light with a converted frequency is focused by the focusing unit ( 4 ).

2. The laser driving device according to claim 1 , wherein a modulus of a complex spatial coherence of a light field of the laser from the laser seed ( 1 ) is less than 0.5.

3. The laser driving device according to claim 1 , further comprising

a spatial transmission device ( 222 ) for controlling a divergence angle of a light beam to regulate the transmission of the laser beam,

wherein the spatial transmission device ( 222 ) is placed behind the laser seed ( 1 ) and in front of the amplification and transmission unit ( 2 ) in the optical pathway.

4. The laser driving device according to claim 1 , wherein the frequency conversion performed by the frequency conversion unit ( 3 ) is frequency doubling, frequency tripling, or frequency quadrupling.

5. The laser driving device according to claim 1 , wherein the focusing unit ( 4 ) comprises an optical element for focusing.

6. The laser driving device according to claim 1 , wherein the focusing unit ( 4 ) further comprises arrayed lenses or arrayed orthogonal cylindrical lenses.

7. The laser driving device according to claim 1 , wherein the focusing unit ( 4 ) further comprises an optical element for adjusting phases.

8. The laser driving device according to claim 1 , further comprising

a beam shaping component ( 6 ) configured for controlling intensities and phases of a light beam.

9. The laser driving device according to claim 8 , wherein the beam shaping component ( 6 ) is one or more of a serrated aperture, a birefringent lens group in conjunction with a neutral density filter, an amplitude-type binary optical panel, a phase-type binary optical panel, a binary transmittance liquid crystal cell, an amplitude-type electrical addressing modulator, an amplitude-type optical addressing modulator, a phase-type electrical addressing spatial light modulator, and an adaptive optical component.

10. The laser driving device according to claim 1 , further comprising a collimation component ( 8 ) for collimating each light beam in the laser driving device.

11. A method for enabling a uniform light field using the device of claim 1 , comprising

adopting a narrow-band low-spatial-coherence light source as the laser seed ( 1 ),

amplifying light by the amplification and transmission unit ( 2 ) to obtain an amplified light,

subjecting the amplified light to frequency conversion by the frequency conversion unit ( 3 ), and converting the amplified light to a light with a converted frequency, and

focusing the light with the converted frequency by the focusing unit ( 4 ) to obtain a light field with uniform near and far fields.