Full-solid-state single longitudinal mode yellow light laser

A single longitudinal mode and laser technology, which is applied in lasers, laser components, phonon exciters, etc., can solve the problem of sensitivity to changes in pump power or cavity length, single longitudinal mode operation mechanism is easily damaged, and frequency-selective components The production requirements are harsh and other issues, to achieve the effect of eliminating multi-longitudinal mode competition, improving stability and spectral line purity, and small size

Inactive Publication Date: 2014-03-05
TSINGHUA UNIV
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Problems solved by technology

[0004] However, in existing all-solid-state yellow lasers, due to the existence of spatial hole-burning effects and the simultaneous occurrence of multiple nonlinear processes in the same resonator, the laser works in a multi-mode mode, and the competition between the longitudinal modes will cause the laser The output power is unstable, and the yellow spectral line is not pure
In the traditional method, the linewidth of the laser is controlled by inserting frequency-selective components such as etalons. However, the problem it faces is that the production of frequency-selective components is demanding, sensitive to changes in pump power or cavity length, and single longitudinal mode operation The mechanism is easily broken

Method used

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Embodiment 1

[0038] Such as figure 1As shown, in the all-solid-state single longitudinal mode yellow laser of this embodiment, two λ / 4 wave plates are arranged in parallel on both sides of the laser crystal 35, and the Brewster window 343 is arranged between the second λ / 4 wave plate 342 and the splitter. Between the beam mirrors 36, the Brewster window ensures that the P-polarized 1064nm fundamental frequency light has zero reflection loss and prevents the S-polarized light from passing through; in addition, the specific selection of each optical element of the all-solid-state single longitudinal mode yellow laser in this embodiment The type parameters are: LD end pump source 1, laser diode LD provides 808nm pump light, the maximum output power is 20W, and comes with a cooling device; the core diameter of the coupling fiber is Φ200um, the numerical aperture is 0.22, and the collimating and focusing lenses are coated with 808nm Transparent film; a Raman composite resonator composed of the ...

Embodiment 2

[0041] Such as figure 2 As shown, this embodiment is basically the same as Embodiment 1, except that the two λ / 4 wave plates of the all-solid-state single longitudinal mode yellow laser of this embodiment are arranged in parallel on both sides of the Raman crystal 37, Brewster The window 343 is arranged between the second λ / 4 wave plate 342 and the beam splitter 36, wherein the Brewster window 343 window ensures that the P-polarized Stokes light has zero reflection loss and prevents the S-polarized Stokes light from passing through, and the two λ / 4 waves The center wavelength of the slice corresponds to the Stokes light wavelength, and the other optical path propagation processes are exactly the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to a full-solid-state single longitudinal mode yellow light laser which is characterized in that an LD pump source, an optical coupling system and a Raman compound resonant cavity are included, and a torsion cavity film structure comprises a Brewster window and a lambda / 4 wave plate combination; pump light emitted from the LD pump source is emitted to a laser crystal through the optical coupling system and then is absorbed, and the laser crystal generates base frequency light resonance after absorbing pump light energy; base frequency light is spread in a base frequency light resonant cavity in a reciprocating mode and forms linear polarized light through the Brewster window, and the lambda / 4 combination on the two sides of the crystal guarantees that light spread in the crystal on the inner side of the lambda / 4 wave plate combination is circular polarized light and light spread in the crystal on the outer side of the lambda / 4 wave plate combination is linear polarized light; single longitudinal mode base frequency light is reflected by a beam splitter and is emitted to a Raman crystal to be converted to Stokes light which is spread in a Stokes light resonant cavity in a reciprocating mode, the Stokes light is reflected to the beam splitter through a first output mirror, and the Stokes light transmitted through the beam splitter is sent to a frequency doubling crystal which doubles the frequency of the single longitudinal mode Stokes light to generate single longitudinal mode yellow light; the single longitudinal mode yellow light is output after being reflected by the beam splitter.

Description

technical field [0001] The invention relates to an all-solid-state laser, in particular to an all-solid-state single longitudinal mode yellow laser. Background technique [0002] With the advantages of small size, high efficiency, stability and reliability, and easy operation, all-solid-state lasers have become irreplaceable ideal light sources in the laser industry. With the continuous improvement of crystal material growth technology and nonlinear optical technology, the output spectrum of all-solid-state lasers has been greatly expanded, covering multiple bands from infrared to visible light to ultraviolet. One of the highlights is the yellow laser in the 560nm-590nm band. get. According to the existing technology, the yellow-orange light in this band matches the absorption peaks of human hemoglobin and some specific fluorescent substances, so it is useful in the fields of blood cell counting, laser ophthalmology and dermatology treatment, biomedical testing, and deep sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/08H01S3/108
Inventor 李小丽谈宜东张书练
Owner TSINGHUA UNIV
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