CN2812352Y - Full-solid quasi-continuous wavelength tuning Titanium-doped sapphire -PPLN optical parametric oscillator - Google Patents
Full-solid quasi-continuous wavelength tuning Titanium-doped sapphire -PPLN optical parametric oscillator Download PDFInfo
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- CN2812352Y CN2812352Y CN 200520026990 CN200520026990U CN2812352Y CN 2812352 Y CN2812352 Y CN 2812352Y CN 200520026990 CN200520026990 CN 200520026990 CN 200520026990 U CN200520026990 U CN 200520026990U CN 2812352 Y CN2812352 Y CN 2812352Y
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- 230000003287 optical effect Effects 0.000 title claims abstract description 42
- 229910052594 sapphire Inorganic materials 0.000 title claims description 10
- 239000010980 sapphire Substances 0.000 title claims description 10
- 239000007787 solid Substances 0.000 title description 3
- 239000013078 crystal Substances 0.000 claims abstract description 40
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 29
- 239000010936 titanium Substances 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 238000002834 transmittance Methods 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000010437 gem Substances 0.000 abstract description 14
- 229910001751 gemstone Inorganic materials 0.000 abstract description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 238000007747 plating Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
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- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model relates to a quasi-continuous wavelength tuning PPLN optical parameter oscillator which comprises a first stage pumping source, a first stage coupling system, a second stage pumping source, a second stage coupling system and an optical parameter oscillating cavity, wherein the first stage pumping source comprises a flat cavity structure composed of a first plane mirror M1 and a second plane mirror M2. A switching device Q, an initial optical pumping source, a harmonic reflection mirror and a frequency doubling crystal body between the first plane mirror M1 and the second plane mirror M2 carry out adjustment to base frequency light in sequence from the first plane mirror. A resonant cavity of the second stage pumping source is composed of a third plane mirror M3 and a fourth plane mirror M4. A titanium jewel crystal body is arranged on a focal point of the first coupling lens L1, and a prism is arranged between the third plane mirror M3 and the titanium jewel crystal body. The optical parameter oscillating cavity is composed of a back mirror M5 and an output mirror M6. A PPLN crystal body is arranged near the focal point of the second coupling lens L2 which is arranged between the back mirror M5 and the output mirror M6. The optical parameter oscillator of the utility model has the advantages of high power level, simple and compact structure and small size. In addition, the utility model is provided with a broadband tunable light source of a quasi-phase matching optical parameter oscillator.
Description
Technical Field
The utility model relates to an optical parametric oscillator laser especially relates to a harmonious titanium precious stone-PPLN optical parametric oscillator of accurate continuous wavelength of full solid state.
Background
At present, a periodic polarization crystal is adopted to realize a quasi-phase matching optical parametric oscillator, which is a novel important means and an effective way for realizing a tunable light source.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a power level height, simple structure compactness and small, still have the tunable light source of broadband of accurate phase matching optical parameter oscillator.
The utility model adopts the technical proposal that: a quasi-continuous operation wavelength tuning PPLN optical parametric oscillator comprises a primary pump source, a primary coupling system, a secondary pump source, a secondary coupling system and an optical parametric oscillation cavity. The primary pump source comprises a flat-flat cavity structure formed by a first flat mirror M1 and a second flat mirror M2, and a switching device Q for modulating fundamental frequency light, an initial optical pump source, a harmonic mirror and a frequency doubling crystal are sequentially arranged between the first flat mirror M1 and the second flat mirror M2 from the first flat mirror M1. The primary coupling system includes a first coupling lens L1 for coupling the pump light generated by the primary pump source into the resonator of the secondary pump source. The resonant cavity of the secondary pump source is composed of a third plane mirror M3 and a fourth plane mirror M4, a titanium sapphire crystal is arranged at the focus of the first coupling lens L1, and a prism is arranged between the third plane mirror M3 and the titanium sapphire crystal. The secondary coupling system includes a second coupling lens L2 for coupling pump light generated by the secondary pump source into the optical parametric oscillation cavity. The optical parametric oscillation cavity is constituted by a rear mirror M5 and an output mirror M6, and a PPLN crystal is disposed in the vicinity of the focal point of a second coupling lens L2 disposed therebetween.
Wherein,
the initial optical pumping source is a laser diode array which is arranged according to an equilateral triangle and pumps laser media in a lateral pumping mode, and the laser media are Nd: YAG with size of phi 3 × 80mm, two ends ground into plane, coated with antireflection film for fundamental frequency light, and cooled by flowing cooling water.
The frequency doubling crystal is a KTP crystal, the II-type phase matching is adopted, the cutting angle is theta 90 degrees, phi 23.6 degrees, the size is 6 multiplied by 10mm, and antireflection films of fundamental frequency light and frequency doubling light are plated on two sides.
The central axis of the titanium gem crystal is vertical to the crystal axis, and is provided with two light-transmitting end faces cut at the Brewster angle, the normal lines of the two light-transmitting end faces are in the same plane with the crystal axis, and the polarization direction of the pump light in the Brewster incident plane is consistent with the crystal axis.
The length of the titanium gem crystal in the light transmission direction is 15mm, and the section is a square with the side length of 5 mm.
The spatial position of the mirror M3 that constitutes the secondary pump source cavity can be adjusted.
As a still further preferred solution it is possible to,
a 1064nm high-reflection film is plated on the first plane mirror (M1);
plating a 1064nm antireflection film on the switching device (Q);
plating a 1064nm antireflection film and a 532nm high-reflection film on the harmonic reflector;
a third plane mirror (M3) forming the resonant cavity is plated with a 750-850 nm high-reflection film;
a 532nm high-reflection film is plated on a fourth plane mirror (M4) forming the resonant cavity, a 750-850 nm semi-permeable film is plated on the fourth plane mirror, and the transmittance is 20%;
the rear mirror (M5) is plated with a high-reflection film with the wavelength of 750-850 nm and an OPO output waveband;
the curvature radius of the output mirror (M6) is 60mm, the output mirror is plated with a high reflection film of 750-850 nm and a semi-permeable film of an OPO output wave band, and the transmittance is about 15%.
The OPO output waveband is divided into three wavebands which are respectively 0.9-1.7 um, 1.7-2.5 um and 2.5-3.2 um.
The utility model discloses the beneficial effect who brings:
(1) the utility model discloses all adopt all solid-state device, its compact structure, firm durable, the price is lower.
(2) The primary pumping device adopts LD as original pumping source, frequency doubling crystal is KTP, and acousto-optic Q switch is used for frequency modulation to realize quasi-continuous operation with high peak power.
(3) The pulse width of the titanium sapphire laser generated by the secondary pumping device can be reduced by one order of magnitude compared with the pump light generated by the primary pumping source, the peak power is greatly improved, and the titanium sapphire laser is an ideal pumping source of the PPLN parametric oscillator.
(4) The quasi-phase matching optical parametric oscillator is realized by adopting the periodically polarized crystal, and the tunable light source with high output power, high efficiency, large tunable wavelength range, long service life, compact structure and small volume is obtained by adjusting related parameters.
Drawings
FIG. 1 is a diagram of the overall structure of the optical parametric oscillator of the present invention
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and the overall structure of the present invention is shown in fig. 1.
M1 is a 1064nm total reflection mirror, M2 is a 532nm pump light output mirror of the titanium sapphire laser, which totally reflects 1064nm light and has high transmittance to 532nm light. The green light pumping source of the titanium sapphire laser is formed by M1 and M2, the traditional straight cavity type flat-flat cavity structure with high gain and large laser medium internal mode volume is adopted, and the length of the whole resonant cavity is 330 mm. The high-power semiconductor array laser produced by the semiconductor of the Chinese academy of sciences is used as an initial optical pumping source and is a laser diode array which is arranged according to an equilateral triangle and pumps laser media in a lateral pumping mode, four groups of three laser diode bars are symmetrically arranged around a YAG rod, and the YAG rod can uniformly pump and activate the media YAG rod. Each group of diode bars consists of 100 diodes with the power of 200mW, the diodes work continuously, and the total maximum pumping power is 240W. The entire pump assembly (including the laser diode and YAG rod) is cooled by flowing cooling water. The size of the laser medium is phi 3 multiplied by 80mm, two ends are ground into planes, and an anti-reflection film with 1064nm is plated. The acousto-optic Q switch is produced by GOOCH company of England, wherein the crystal is fused quartz with the diameter of 8 mm multiplied by 10mm multiplied by 50mm, the driving power is 100W, the working frequency is 27MHz, the diffraction efficiency is 20 percent, the modulation frequency is 1-50 kHz, the effective light-passing aperture is 15mm multiplied by 15mm, and an anti-reflection film with the diameter of 1064nm is plated. The harmonic reflector is highly transparent to 1064nm light and highly reflective to 532nm light, so that the frequency doubling conversion efficiency is improved. The KTP crystal was cut at a class II phase matching angle (θ 90 °, Φ 23.6 °), and 6 × 6 × 10mm in size, with antireflection films of 532nm and 1064nm coated on both sides.
In order to better match the 532nm pump light to the Titania oscillator mode and achieve higher power density, a focusing lens L1 with a focal length of 150mm was used to focus the pump light into the Titania cavity, and a Titania crystal was placed at the focus of the pump light beam. The length of the titanium gem crystal in the light transmission direction is 15mm, and the section is a square with the side length of 5 mm. The central axis of the titanium sapphire bar is perpendicular to the crystal axis c, the two light-transmitting end faces are cut at the Brewster angle, and the normal lines of the two light-transmitting surfaces and the crystal axis c are in the same plane. The polarization direction of the pump light in the brewster incident plane coincides with the c-axis. A flat cavity is adopted to form a titanium gem laser resonant cavity, the cavity length is about 200mm, and a crystal is approximately placed in the center of the cavity. The M3 total reflection mirror plates a high reflection film on the titanium jewel operating waveband of 750-850 nm, the output mirror M4 plates a high reflection film on the titanium jewel operating waveband of 532nm, and the transmittance is 20% in the range of 750-850 nm. The prism is used as a wavelength tuning element, so that the output light of the titanium gem is continuously adjustable within the range of 780-820 nm.
M and M' are all-reflecting mirrors of the titanium sapphire wave band, so that the volume of the whole experimental device is reduced. L2 is a focusing lens with a focal length of 100mm to increase the power density of the titanium sapphire pump light. M5 is OPO rear mirror, and the titanium gem operation waveband is 750-850 nm and the OPO output waveband is plated with high reflection film. M6 is OPO output mirror, curvature radius is 60mm, and the transmittance to OPO output wave band is about 15% to titanium gem wave band plating high reflection film. The entire optical parametric oscillator cavity length is about 80 mm. The adopted PPLN crystal has a polarization period of 20.5um, and is fixed in a temperature control furnace, and the temperature of the temperature control furnace can be continuously changed from normal temperature to 473K. The end face of the PPLN crystal is coated with an antireflection film facing the output wave band of the pump light of 750-850 nm and OPO.
And performing cavity mirror coating selection on the OPO tuning waveband according to a curve obtained by theoretical calculation. The OPO tunable filter is divided into three wave bands which are respectively 0.9-1.7 um, 1.7-2.5 um and 2.5-3.2 um, and the OPO tunable filter realizes the spectral range of 1-3 um.
It should be noted that while the present invention has been described in detail with particular reference to certain preferred forms thereof, it is to be understood that this description is made only by way of example to illustrate the invention and that changes may be made in detail, including in matters of combination and arrangement of parts, in the construction and use of the parts particularly adapted to the specific details of construction and use to which the invention pertains and which are within the scope of the present invention.
The embodiment adopts all-solid-state quasi-continuous 532nm frequency doubling Nd: YAG laser (primary device) is used as initial optical pumping source, pulse width is less than 80ns, repetition frequency is 5kHz, pumping titanium gem crystal is used as resonant cavity (secondary device) of laser medium, prism is used as tuning element to form all solid-state quasi-continuous tunable titanium gem laser, repetition frequency is 5kHz, line width is 2nm, laser pulse width is less than 20 ns. A tunable titanium gem laser pumping PPLN optical parametric oscillator (three-stage device) is used, a novel tuning mode of changing pumping wavelength is adopted, and the Epsilon folding back characteristic of a tuning curve of the PPLN optical parametric oscillator is utilized to obtain 1-3 um wide tuning output. The quasi-phase matching optical parametric oscillator has the advantages of high power level, compact structure, low price and the like of the all-solid-state laser, has the advantages of tunable broadband and small volume of the quasi-phase matching optical parametric oscillator, has wide scientific research value and wide application prospect in the fields of medical imaging, environment monitoring, optical fiber communication, spectral analysis, photoelectric countermeasure, optical sensing and the like, and fills up the technical blank in the field.
Claims (9)
1. The utility model provides a harmonious PPLN optical parametric oscillator of quasi-continuous operation wavelength, includes the primary pump source, primary coupling system, the secondary pump source, secondary coupling system, optical parametric oscillation chamber, characterized by:
the primary pump source comprises a flat cavity structure consisting of a first flat mirror (M1) and a second flat mirror (M2), and a switch device (Q) for modulating fundamental frequency light, an initial optical pump source, a harmonic mirror and a frequency doubling crystal are sequentially arranged between the first flat mirror (M1) and the second flat mirror (M2) from the first flat mirror (M1);
the primary coupling system comprises a first coupling lens (L1) for coupling the pump light generated by the primary pump source into the resonant cavity of the secondary pump source;
the resonant cavity of the secondary pump source is composed of a third plane mirror (M3) and a fourth plane mirror (M4), a titanium sapphire crystal is arranged at the focus of the first coupling lens, and a prism is arranged between the third plane mirror (M3) and the titanium sapphire crystal;
the secondary coupling system comprises a second coupling lens (L2) for coupling the pump light generated by the secondary pump source into the optical parametric oscillation cavity;
the optical parametric oscillation cavity is composed of a back mirror (M5) and an output mirror (M6), and a PPLN crystal is arranged near the focus of a second coupling lens positioned between the back mirror and the output mirror.
2. The PPLN optical parametric oscillator according to claim 1, wherein the initial optical pump source is a laser diode array arranged in an equilateral triangle and pumping a laser medium in a side-to-side pumping manner, the laser medium is Nd: YAG and has a size of phi 3 x 80mm, both ends of the laser diode array are ground to be flat, an antireflection film for fundamental frequency light is coated, and flowing cooling water is used to cool the laser diode array and the laser medium.
3. The PPLN optical parametric oscillator according to claim 1, wherein the frequency doubling crystal is a KTP crystal, and a type II phase matching is adopted, and the cut angle is 90 ° θ, 23.6 ° Φ, and 6 × 6 × 10mm in size, and both sides are coated with antireflection films for fundamental light and frequency doubling light.
4. The PPLN optical parametric oscillator according to claim 1, wherein the central axis of the titanium sapphire crystal is perpendicular to the crystal axis, having two light-passing end faces cut at brewster's angle, and the normals of the two light-passing end faces are both in the same plane as the crystal axis, and the polarization direction of the pump light in the brewster's plane of incidence is coincident with the crystal axis.
5. The PPLN optical parametric oscillator according to claim 1, wherein the length of the titanium sapphire crystal in the light-transmitting direction is 15mm, and the cross section is a square with a side length of 5 mm.
6. The PPLN optical parametric oscillator of claim 1, wherein the spatial position of the plane mirror M3 that constitutes the secondary pump source resonator is adjustable.
7. The PPLN optical parametric oscillator of claim 1, wherein the polarization period of the PPLN crystal is 20.5um, its end face is plated with 750-850 nm and OPO output band is plated with antireflection film, fixed in a temperature controlled oven, the temperature of which can be changed continuously from room temperature to 473K.
8. The PPLN optical parametric oscillator of any of claims 1 to 7,
the first plane mirror (M1) is plated with a 1064nm high-reflection film;
the repetition frequency of the switching device (Q) is 5kHz, and a 1064nm antireflection film is plated;
the harmonic reflector is plated with a 1064nm antireflection film and a 532nm high-reflection film;
a third plane mirror (M3) forming the resonant cavity is plated with a 750-850 nm high-reflection film;
a 532nm high-reflection film and a 750-850 nm semi-permeable film are plated on a fourth plane mirror (M4) forming the resonant cavity, and the transmittance is 20%;
the rear mirror (M5) is plated with a high-reflection film with the wavelength of 750-850 nm and an OPO output waveband;
the curvature radius of the output mirror (M6) is 60mm, the output mirror is plated with a high reflection film of 750-850 nm and a semi-permeable film of an OPO output wave band, and the transmittance is 15%.
9. The PPLN optical parametric oscillator of claim 8,
the OPO output waveband is divided into three wavebands which are respectively 0.9-1.7 um, 1.7-2.5 um and 2.5-3.2 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520026990 CN2812352Y (en) | 2005-08-12 | 2005-08-12 | Full-solid quasi-continuous wavelength tuning Titanium-doped sapphire -PPLN optical parametric oscillator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200520026990 CN2812352Y (en) | 2005-08-12 | 2005-08-12 | Full-solid quasi-continuous wavelength tuning Titanium-doped sapphire -PPLN optical parametric oscillator |
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| CN2812352Y true CN2812352Y (en) | 2006-08-30 |
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| CN 200520026990 Expired - Fee Related CN2812352Y (en) | 2005-08-12 | 2005-08-12 | Full-solid quasi-continuous wavelength tuning Titanium-doped sapphire -PPLN optical parametric oscillator |
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