An all-solid-state 696 nm laser

Abstract

The utility model relates to a kind of lasers, especially a kind of all-solid-state 696nm laser, including the pump source, collimation focusing system, crystal and output mirror arranged in sequence, the crystal is Pr 3+ :YLF, the two ends of the crystal are equipped with first film layer and second film layer respectively, the two ends of the output mirror are equipped with third film layer and fourth film layer respectively.The all-solid-state 696nm laser provided by the utility model utilizes the energy level characteristics of Pr:YLF crystal itself, and realizes selective oscillation and amplification to 696nm spectrum line by coating, while inhibiting main competing spectrum line (especially 698nm), so as to obtain pure, stable 696nm laser output.

Description

Technical Field

[0001] This utility model relates to a laser, and more particularly to an all-solid-state 696nm laser. Background Technology

[0002] A 696nm laser is a special light source that utilizes praseodymium-doped crystals to output deep red laser light. Existing 696nm lasers employ methods such as birefringence and FP etalons to obtain 696nm laser light, resulting in extremely complex systems with low integration and numerous components. A complete system requires at least the following core components: a pump source, an optical resonator, tuning elements, and a monitoring and feedback system. Each component requires precise collimation and positioning. The optical path is long and has many nodes; any slight misalignment can lead to a sharp drop in efficiency or complete loss of output. Installation and initial commissioning are highly specialized and time-consuming tasks. Furthermore, stability and reliability are poor, and the system is extremely sensitive to the environment: the FP etalon and the entire optical cavity are highly sensitive to temperature fluctuations, vibrations, and airflow. Slight vibrations in the laboratory, personnel movement, and air conditioning switching can cause laser mode "mode skipping" or drastic fluctuations in output power, making it impossible to obtain a stable 696nm laser output. The spacer in the FP etalon expands and contracts with temperature changes, causing its transmission peak wavelength to drift. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides an all-solid-state 696nm laser, the specific technical solution of which is as follows: An all-solid-state 696nm laser includes a pump source, a collimating and focusing system, a crystal, and an output mirror arranged sequentially, wherein the crystal is Pr 3+ YLF, the crystal has a first film layer and a second film layer at both ends, and the output mirror has a third film layer and a fourth film layer at both ends.

[0004] Preferably, the pump source includes a 441nm laser diode.

[0005] Preferably, the first film layer comprises HT@441nm and HR@696nm.

[0006] Preferably, the second film layer includes AR@696nm, HT@480~490nm&546nm&607nm&640nm&719nm.

[0007] Preferably, the third film layer includes T=1%@696nm, HT@480~490nm&546nm&607nm&640nm&719nm.

[0008] Preferably, the fourth film layer comprises AR@696nm.

[0009] Preferably, the crystal is c-cut Pr 3+ YLF crystal.

[0010] Preferably, the output mirror is a planar concave mirror, with the concave surface facing the crystal.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an all-solid-state 696nm laser that utilizes the energy level characteristics of the Pr:YLF crystal itself and achieves selective oscillation and amplification of the 696nm spectral line through coating, while suppressing the main competing spectral lines (especially 698nm), thereby obtaining a pure and stable 696nm laser output. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this application. Detailed Implementation

[0013] The present invention will now be further described with reference to the accompanying drawings.

[0014] like Figure 1 As shown, an all-solid-state 696nm laser includes a pump source 1, a collimation and focusing system 2, a crystal 3, and an output mirror 4 arranged sequentially. The crystal 3 is a Pr... 3+ YLF, the two ends of the crystal 3 are respectively provided with a first film layer 51 and a second film layer 52, and the two ends of the output mirror 4 are respectively provided with a third film layer 53 and a fourth film layer 54.

[0015] Pump source 1 includes a 441nm laser diode.

[0016] The first film layer 51 includes HT@441nm and HR@696nm.

[0017] The second membrane layer 52 includes AR@696nm, HT@480~490nm&546nm&607nm&640nm&719nm. The third membrane layer 53 includes T=1%@696nm, HT@480~490nm&546nm&607nm&640nm&719nm.

[0018] The fourth film layer 54 includes AR@696nm.

[0019] Crystal 3 is c-cut Pr 3+ YLF crystal.

[0020] The output mirror 4 is a planar concave mirror, with the concave surface facing the crystal 3.

[0021] The light emitted from pump source 1 is collimated and focused onto Pr by an optical system. 3+ Within YLF crystal 3, the crystal gains energy to form an upper energy level.

[0022] Pr:YLF lasers exhibit emission peaks at both ~696 nm and ~698 nm, with a typically stronger gain at 698 nm. If the resonant cavity provides feedback for both wavelengths, the laser will preferentially oscillate at 698 nm.

[0023] c-cutPr 3+ YLF crystals emit only delta-polarized spectral lines and suppress π-polarized lines. Therefore, only the delta-polarized 696nm line can form laser light, while the π-polarized 698nm line is suppressed.

[0024] Since the excitation cross-section of the 696nm spectral line is relatively small, the solution in this design is to use a coating of 1%@696nm on the output mirror to reduce the excitation threshold with a smaller transmittance, which makes it easier to form resonance.

[0025] Complete suppression of parasitic oscillations: The HT@480~490nm, 546nm, 607nm, 640nm, and 719nm wavelengths on the back face of the crystal allow all other major fluorescence bands generated by Pr:YLF (490nm green, 607nm orange, 640nm red, and 719nm deep red) to be transmitted, preventing them from oscillating within the resonant cavity. This ensures that all pump energy can be concentrated on generating 696nm laser light, rather than wasted on generating other wavelengths, significantly reducing the oscillation threshold and improving the conversion efficiency of 696nm.

[0026] The existing scheme of "solid-state laser pumping + liquid dye + external mechanical tuning" has been replaced by "solid-state diode pumping + intrinsic selection of energy level and film system". The structure is simple and easy to mass-produce.

[0027] It features high reliability, long lifespan, maintenance-free operation, compact structure, and high stability.

[0028] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. An all-solid-state 696nm laser, characterized in that, The system includes a pump source (1), a collimation and focusing system (2), a crystal (3), and an output mirror (4) arranged in sequence, wherein the crystal (3) is a Pr 3+ YLF, the crystal (3) has a first film layer (51) and a second film layer (52) at both ends, and the output mirror (4) has a third film layer (53) and a fourth film layer (54) at both ends.

2. The all-solid-state 696nm laser according to claim 1, characterized in that, The pump source (1) includes a 441nm laser diode.

3. The all-solid-state 696nm laser according to claim 1, characterized in that, The first film layer (51) includes HT@441nm and HR@696nm.

4. The all-solid-state 696nm laser according to claim 1, characterized in that, The second film layer (52) includes AR@696nm, HT@480~490nm&546nm&607nm&640nm&719nm.

5. The all-solid-state 696nm laser according to claim 1, characterized in that, The third film layer (53) includes T=1%@696nm, HT@480~490nm&546nm&607nm&640nm&719nm.

6. The all-solid-state 696nm laser according to claim 1, characterized in that, The fourth film layer (54) includes AR@696nm.

7. The all-solid-state 696nm laser according to claim 1, characterized in that, The crystal (3) is c-cut Pr 3 + YLF crystal.

8. The all-solid-state 696nm laser according to claim 1, characterized in that, The output mirror (4) is a planar concave mirror, with the concave surface facing the crystal (3).

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