CN214754664U - All-solid-state ultrashort pulse laser based on stimulated Brillouin scattering pulse width compression - Google Patents

Abstract

The utility model relates to an all-solid-state ultrashort pulse laser based on stimulated Brillouin scattering pulse width compression, which comprises a laser, a polaroid, a laser amplifier, an 1/4 wave plate, a quartz crystal, a convex lens and a Brillouin generation pool; the laser, the polaroid, the laser amplifier, the 1/4 wave plate, the quartz crystal, the convex lens and the Brillouin generation pool are sequentially arranged along the optical axis. The utility model discloses pulse laser enlargies through quartz crystal, sets up before convex lens, can realize picosecond and subpicosecond's output.

Description

All-solid-state ultrashort pulse laser based on stimulated Brillouin scattering pulse width compression

Technical Field

The utility model relates to a single ultrashort pulse laser of longitudinal mode of narrow pulse of high energy, concretely relates to all solid-state ultrashort pulse laser based on stimulated brillouin scattering pulse width compression.

Background

In practical application, for long-distance laser radar and laser precision machining, the laser energy of the ultrashort pulse laser is required to reach more than ten millijoules. The pulse width of the Q-switched laser which is widely applied at present is nanosecond level, so that the output of picosecond pulses is difficult to realize; although the mode-locked laser can output picosecond and femtosecond pulses, the energy of the mode-locked laser is too small and is in a micro-focus level, even if the mode-locked laser is subjected to regenerative amplification, the energy is only in a millijoule level, the line width of the laser is very wide, and the coherence is poor. Therefore, the utility model provides an output laser pulse width is at the picosecond, and pulse energy is at the narrow linewidth laser of tens millijoule magnitude to satisfy the needs in fields such as remote laser radar of practical application and laser precision finishing.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the current ultrashort pulse laser can not realize the output of the single longitudinal mode of narrow high energy, the utility model provides an all-solid-state ultrashort pulse laser based on stimulated brillouin scattering pulse width compression.

The utility model discloses a realize through following technical scheme:

an all-solid-state ultrashort pulse laser based on stimulated Brillouin scattering pulse width compression comprises a laser, a polaroid, a laser amplifier, an 1/4 wave plate, a quartz crystal, a convex lens and a Brillouin generation pool; the laser, the polaroid, the laser amplifier, the 1/4 wave plate, the quartz crystal, the convex lens and the Brillouin generation pool are sequentially arranged along the optical axis. P polarized light generated by the laser is transmitted through the polaroid (2), amplified by the laser amplifier (3) and then changed into circularly polarized light through the 1/4 wave plate (4), the circularly polarized light passes through the quartz crystal (5) and then is focused into the Brillouin generation pool (7) through the convex lens (6), light beams are focused, energy can reach the SBS threshold value, stimulated Brillouin scattering occurs near the focus, backward stokes light is amplified by the quartz crystal (5) and then is changed into S polarized light through the 1/4 wave plate along the original path, and the S polarized light is reflected out of a reflection light path through the polaroid after being secondarily amplified by the laser amplifier, so that separation is realized.

The Brillouin generation pool is filled with a solid Brillouin medium, such as one of quartz, DLAP, LAP and barium nitrate.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses pulse laser enlargies through quartz crystal, sets up before convex lens, can realize picosecond and subpicosecond's output. The pulse width output by the laser is narrower, thus the pulse output of picoseconds and subpicosecond magnitude can be realized, and the pulse output is far smaller than that of a Q-switched laser; the single pulse energy is higher, but reaches dozens of millijoules magnitude, and is far higher than that of a mode-locked laser.

The utility model discloses when exporting the single longitudinal mode pulse of high energy, realized narrow pulse width to because the phase conjugation characteristic of stimulated brillouin scattering can guarantee good light beam quality. Compared with other lasers based on stimulated Brillouin scattering pulse width compression, the laser based on stimulated Brillouin scattering pulse width compression can output high-energy single longitudinal mode pulses, does not use liquid or gas gain media, really achieves all-solid-state design, and is simpler in structure, small in size, simpler in structure and lower in manufacturing cost.

The utility model discloses pulse laser does not need the beam expander, and what the light source produced is P polarized light, is s polarized light behind the polaroid, makes the device more simple and convenient, reduce cost promptly.

Drawings

Fig. 1 is a schematic structural diagram of an all-solid-state ultrashort pulse laser based on stimulated brillouin scattering pulse width compression according to the present invention;

fig. 2 is a pulse width measurement diagram of 180ps, 310ps, 500ps, 650ps, 800ps, 8.2ns outputted by the present invention after adjusting the pumping energy.

In the figure: 1. a laser; 2. a polarizing plate; 3. a laser amplifier; 4. 1/4 a wave plate; 5. a quartz crystal; 6. a convex lens; 7. a brillouin generation cell.

Detailed Description

The present invention will be further explained with reference to the following examples and drawings, but the scope of the present invention is not limited thereto.

The utility model discloses well polarization piece 2, 1/4 wave plate 4 constitute a separation light path, and the P polarized light that transmits through the polaroid becomes the circular polarized light through 1/4 wave plate earlier, and the circular polarized light that the backscattering was returned becomes S polarized light through 1/4 wave plate, realizes the separation through the reflection of polaroid.

The pulse generated by the laser 1 penetrates through the quartz crystal 5, is focused in the generating pool 7 to generate backward stokes scattering, and after the pumping light is extracted and amplified by the quartz crystal 5, the original pulse is compressed, wherein the width of the obtained compressed pulse is 800 fs-100 ps, and the preferable pulse width is 800 fs-800 ps.

The pulse generated by the laser 1 is amplified by the laser amplifier 3, and high-energy pulse can be generated; the pulse is focused to the Brillouin generation pool 7 through the lens to generate stimulated Brillouin scattering to generate backward stokes light, the backward stokes light is used for extracting the pump light through the quartz crystal 5, the extraction rate exceeds 90%, theoretically can reach 100%, and high energy, high peak power and narrow pulse can be output.

The size of the quartz crystal can be several nanometers to dozens of millimeters, and the quartz crystal is directly fixed in an optical path and is selected according to the actually required power. The laser 1 can produce seed light, and the pulse laser of this application sends out big, compression processing to seed light, produces the narrow pulse width laser of higher energy.

Example 1: with reference to fig. 1, an all-solid-state ultrashort pulse laser based on stimulated brillouin scattering pulse width compression comprises a laser 1, a polarizer 2, a laser amplifier 3, an 1/4 wave plate 4, a quartz crystal 5, a convex lens 6 and a brillouin generation cell; p polarized light generated by the laser is transmitted through the polaroid 2, amplified by the laser amplifier and then changed into circularly polarized light through the 1/4 wave plate 4, the circularly polarized light passes through the quartz crystal 5 and then is focused into the Brillouin generation pool 7 through the lens 6, stimulated Brillouin scattering occurs near a focus, the backward stokes light is amplified by the quartz crystal 5 and then is changed into S polarized light through the 1/4 wave plate along the original path, and the S polarized light is reflected out of a light path through the polaroid after being secondarily amplified by the laser amplifier, so that separation is realized.

The refractive index of the quartz crystal 5 is 1.45, the phonon lifetime is 4ns, and the solid medium in the Brillouin generation pool is quartz.

The wavelength of the P-polarized light output by the pulse laser of this embodiment is 1064nm, and the pulse width is 8 ns.

Fig. 2 is a diagram of pulse width measurements of 180ps, 310ps, 500ps, 650ps, 800ps, and 8.2ns output by adjusting the pump energy according to the present embodiment.

Example 2: the structure of this embodiment is the same as that of embodiment 1, and the laser 1 adopts one of wavelengths of 405nm, 445nm, 460nm, 473nm, 532nm, 589nm, 635nm, 650nm, 808nm, and 980nm to realize the output of laser with each wavelength.

Example 3: the structure of the embodiment is the same as that of embodiment 1, except that the interior of the brillouin generation pool 7 is a solid brillouin medium, the refractive index of the solid brillouin medium is 1.2-1.5, and the solid brillouin medium is one of DLAP, LAP and barium nitrate.

The utility model discloses the nothing is mentioned the part and is applicable to prior art.

Claims (9)

1. An all-solid-state ultrashort pulse laser based on stimulated Brillouin scattering pulse width compression is characterized in that the pulse laser comprises a laser, a polaroid, a laser amplifier, an 1/4 wave plate, a quartz crystal, a convex lens and a Brillouin generation pool; the laser, the polaroid, the laser amplifier, the 1/4 wave plate, the quartz crystal, the convex lens and the Brillouin generation pool are sequentially arranged along the optical axis.

2. The pulse laser device according to claim 1, wherein P-polarized light generated by the laser device is transmitted through the polarizer (2), amplified by the laser amplifier (3), and then converted into circularly polarized light by the 1/4 wave plate (4), the circularly polarized light passes through the quartz crystal (5), and then is focused into the brillouin generation cell (7) by the convex lens (6), the light beam is focused, so that energy can reach the SBS threshold, stimulated brillouin scattering occurs near the focus, the backward stokes light is amplified by the quartz crystal (5), then passes through the 1/4 wave plate along the original path, and is converted into S-polarized light, and the S-polarized light is reflected out of the optical path by the polarizer after being secondarily amplified by the laser amplifier, so that separation is achieved.

3. The pulsed laser of claim 1, wherein the brillouin generation cell is a solid brillouin medium.

4. The pulsed laser of claim 1, wherein the solid brillouin medium is one of quartz, DLAP, LAP, and barium nitrate.

5. The pulsed laser of claim 1, wherein the pulse output is on the order of picoseconds and subpicoseconds.

6. The pulsed laser of claim 1, wherein the pulse output has a pulse width of 800fs to 100 ps.

7. The pulsed laser of claim 1, wherein said quartz crystal is fixed directly in the optical path.

8. The pulsed laser of claim 1, wherein said quartz crystal has a refractive index of 1.45, a phonon lifetime of 4 ns; the laser adopts one of the wavelengths of 405nm, 445nm, 460nm, 473nm, 532nm, 589nm, 635nm, 650nm, 808nm and 980 nm.

9. The pulsed laser of claim 1, wherein the pulse output has a pulse width of 800fs to 800 ps.

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