CN115528528A - Special-corner-cut broadband frequency multiplier and application thereof - Google Patents

Special-corner-cut broadband frequency multiplier and application thereof Download PDF

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CN115528528A
CN115528528A CN202110706983.0A CN202110706983A CN115528528A CN 115528528 A CN115528528 A CN 115528528A CN 202110706983 A CN202110706983 A CN 202110706983A CN 115528528 A CN115528528 A CN 115528528A
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crystal
special
angle
ycob
broadband frequency
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王正平
赵学志
于法鹏
许心光
孙洵
王新乐
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Shandong University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation
    • H01S3/1095—Frequency multiplication, e.g. harmonic generation self doubling, e.g. lasing and frequency doubling by the same active medium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/1666—Solid materials characterised by a crystal matrix borate, carbonate, arsenide

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Abstract

The invention relates to a broadband frequency multiplier with a special cutting angle and application thereof, belonging to the field of laser and nonlinear optics. The specific cut angles were (113 °,25.9 °) for YCOB crystals and (114.1 °,32 °) for GdCOB crystals. When the central wavelength of the fundamental light is in the range of 1550-1700nm, the YCOB and GdCOB crystals processed according to the cutting angle can realize high-efficiency broadband frequency-doubled output. The invention has the advantages of low manufacturing cost, mature crystal growth process, high temperature stability, high light damage resistance threshold, high conversion efficiency, large spectral bandwidth and the like, and can realize the output of ultrafast pulse laser with high efficiency, wide spectrum, narrow pulse width and high peak power with the wavelength near 800nm by combining with the erbium-doped solid laser technology.

Description

Special corner-cutting broadband frequency multiplier and application thereof
Technical Field
The invention relates to YCOB and GdCOB crystals with special cut angles and efficient and broadband frequency doubling application thereof, belonging to the technical field of laser and nonlinear optics.
Background
At present, nonlinear optical crystals are the main medium for optical frequency up-conversion, and the more commonly used crystals are mainly KDP, ADP, BBO, LBO, YCOB, gdCOB and the like. By the Czochralski method, large-sized, high-optical-quality single crystals of YCOB and GdCOB can be obtained in a short time. The two crystals have the advantages of large nonlinear optical coefficient, high laser damage threshold, stable physicochemical properties and the like. Therefore, they find wide application in a variety of nonlinear frequency conversions, such as frequency doubling, frequency tripling, optical parametric chirped pulse amplification, and self-frequency doubling.
For birefringent nonlinear optical crystals, the non-critical phase matching is referred to as optimal phase matching due to its high tolerance to operating conditions. According to the influence factors of phase mismatch, the non-critical phase matching can be divided into angle non-critical phase matching, temperature non-critical phase matching and spectrum non-critical phase matching. By doping different kinds of rare earth elements with different proportions, YCOB and GdCOB series crystals can realize frequency doubling of angle non-critical phase matching in a wide band, the tunable range reaches 750-1250 nm, and the angle acceptance bandwidth reaches 43-84mrad cm 1/2 (Opt. Express 25,11867-11893, 2017). By studying the full-space temperature bandwidth, it was determined that the temperature non-critical phase matching directions of the YCOB, gdcoo crystals for frequency doubling at 1064nm were (θ =149.2 °, Φ =0 °), (θ =135 °, Φ =47.3 °), respectively, and the corresponding measured temperature acceptance bandwidths were 490℃ · cm and 430℃ · cm, respectively (opt. Lett.44,1742-1745,2019 opt. Express 28,33274-33284, 2020. So far, no report about the spectrum noncritical phase matching performance of YCOB and GdCOB crystals is found.
Ultrashort pulse laser is increasingly widely applied to the fields of biomedicine, spectroscopy, high-speed communication, environmental detection, ultrafast nonlinear optical phenomenon research and the like. Broadband spectrum, as a fundamental characteristic of ultrashort pulse lasers, puts special demands on nonlinear optical crystals when frequency conversion is considered. To improve conversion efficiency and avoid harmonic pulse broadening, the group velocity mismatch between the fundamental and newly generated pulses in the crystal is small enough compared to the fundamental pulse duration. In the frequency domain, the spectral acceptance bandwidth of the nonlinear optical crystal is sufficiently large compared with the spectral bandwidth of the fundamental frequency. When the group velocity mismatch is zero, the first order wavelength derivative will disappear. The frequency conversion is then only related to the second and higher order wavelength derivatives and is inversely proportional to the square root of the crystal thickness. The frequency conversion mode which simultaneously satisfies phase matching and group velocity matching is spectral non-critical phase matching, and becomes the first choice of ultra-fast laser frequency conversion due to simplicity, reliability and high efficiency. Up to now, some nonlinear crystals have been used for broadband frequency doubling at different wavelengths, such as BBO crystal at 1550nm, biBO crystal at 1600nm, LBO crystal at 1300nm, mgO-doped PPLN crystal at 1550nm, DKDP crystal at 1034-1179nm, DADP crystal at 1027-1161nm, etc. However, the nonlinear crystal material has the disadvantages of difficult growth, small size, high cost, low light damage resistance threshold, low conversion efficiency, low output energy, narrow working band and the like.
At present, the ultra-short pulse laser mainly uses a femtosecond titanium gem laser, however, the femtosecond titanium gem laser has high price, huge size and complex structure. Therefore, it is urgently needed to develop an ultrashort pulse laser with simple structure and low cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a special-corner-cutting broadband frequency multiplier and application thereof. The invention provides a YCOB and GdCOB broadband frequency doubling device with a special cutting angle by utilizing the low symmetry and the refractive index characteristics of YCOB and GdCOB crystals, can be applied to frequency doubling of 1550-1700nm broadband laser light sources (such as erbium-doped ultrafast optical fiber lasers), realizes high-efficiency and high-power broadband laser output near 800nm, and has the advantages of easy growth, low cost, high light damage resistance threshold, high conversion efficiency, large output energy, wide working waveband, small device volume, easy processing, easy installation, long service life and the like. Solves the problems of expensive price, large volume and the like of the titanium gem laser which is generally used at present.
Summary of The Invention
The invention uses YCOB and GdCOB crystals cut in a special direction to realize high-efficiency broadband frequency-doubled output. When the YCOB and GdCOB crystal device is used for frequency doubling in a near infrared band (1550-1700 nm), a fundamental frequency spectrum with the bandwidth of 22 +/-1 nm can generate a frequency-doubled spectrum with the bandwidth of 14 +/-1 nm, the conversion efficiency of the spectral bandwidth is up to 64%, and the highest energy conversion efficiency can be up to 58%.
Description of the terms:
YCOB: is of the formula YCa 4 O(BO 3 ) 3 For short.
GdCOB: is of the formula GdCa 4 O(BO 3 ) 3 For short.
The technical scheme of the invention is as follows:
a broadband frequency multiplier with a special cut angle comprises a YCOB crystal or a GdCOB crystal as a chemical component, wherein the space direction of the YCOB crystal or the GdCOB crystal is described by polar coordinates (theta, phi), theta is an included angle between the direction and an optical principal axis Z, and phi is an included angle between projection of a direction vector in an XY principal plane and an X axis, namely an azimuth angle; the device is obtained for a YCOB crystal at a cut angle of (113 °,25.9 °), or a gdcoob crystal at a cut angle of (114.1 °,32 °).
According to the invention, preferably, the broadband frequency doubling device with the special chamfer can realize broadband frequency doubling of fundamental frequency laser with the central wavelength within the range of 1550-1700 nm.
According to the invention, the broadband frequency multiplier with special cutting angles, namely, the YCOB crystal in the tangential direction (113 degrees, 25.9 degrees) or the GdCOB crystal in the tangential direction (114.1 degrees, 32 degrees) has a turning point on a phase matching curve in a 1.55-1.7 mu m waveband, and can realize high-efficiency broadband frequency multiplication output.
According to the present invention, it is preferable that, when the broadband frequency doubling is performed using a broadband frequency doubling device with a special cut angle, the variation of the phase matching angle of the YCOB crystal at the (113 DEG, 25.9 ℃) tangential direction is less than or equal to 0.3 DEG and the variation of the phase matching angle of the GdCOB crystal at the (114.1 DEG, 32 ℃) tangential direction is less than or equal to 0.1 DEG when the wavelength of the fundamental light is increased from 1550nm to 1700 nm. Namely: when the wavelength of fundamental light is changed in the range of 1550-1700nm, the variation of the corresponding phase matching angle phi of the YCOB crystal in the tangential direction (113 degrees and 25.9 degrees) is 25.9-26.2 degrees, and theta is unchanged; the GdCOB crystals in the tangential direction (114.1 degrees and 32 degrees) have a corresponding change of the phase matching angle phi of 32 degrees to 32.1 degrees, and theta is unchanged.
According to the present invention, it is preferable that the size of YCOB crystals or GdCOB crystals is 6X 10mm 3 I.e. the light-passing cross-section of the YCOB crystal and GdCOB crystal is 6X 6mm 2 The length in the light-transmitting direction was 10mm.
According to the invention, the broadband frequency multiplier with special cut angle is applied to the ultrashort pulse laser.
An ultrashort pulse laser comprises a light source, a focusing lens, a broadband frequency doubling device with a special cutting angle and a color filter which are sequentially arranged along the propagation direction of a light path.
According to the invention, the focusing lens is preferably coated with a broadband antireflection film of 1400-1800 nm.
According to the invention, preferably, the color filter is plated with a 1400-1800nm broadband high reflection film and a 700-900nm broadband antireflection film.
According to the present invention, when the fundamental light having a central wavelength range of 1550 to 1700nm is focused through the focusing lens, the broadband frequency doubling device of the special chamfer converts the fundamental light into an doubled light, and the remaining fundamental light and the doubled light pass through the color filter simultaneously, wherein the fundamental light is reflected and the doubled light is output through the color filter.
According to the invention, preferably, when the fundamental frequency spectral bandwidth is 22 ± 1nm, the spectral bandwidth of the frequency doubling device with the special cut angle is 14 ± 1nm, and the spectral bandwidth conversion rate reaches 64%.
The invention has not been described in detail, but is in accordance with the state of the art.
The invention has the beneficial effects that:
the invention provides the optimum cut angle outside the main plane for the first time, ensures that the frequency doubling bandwidth is not attenuated, obviously improves the conversion efficiency, and obviously has the integral effect superior to the cut angle of the main plane. Specifically, when the wavelength of fundamental light varies in the range of 1550-1700nm, the broadband double-frequency conversion efficiency of the YCOB crystal at the special tangential (113 degrees, 25.9 degrees) is far greater than that of the traditionally used main plane tangential (139.7 degrees, 0 degrees), and the broadband double-frequency conversion efficiency of the GdCOB crystal at the special tangential (114.1 degrees, 32 degrees) is far greater than that of the traditionally used main plane tangential (146.4 degrees, 0 degrees).
Taking a fundamental frequency light wavelength of 1650nm as an example, when the average power is 100mW, the repetition frequency is 100kHz, and the pulse width is 160fs, the conversion efficiency of the YCOB crystal is 51.4% at the tangential direction of (113 degrees, 25.9 degrees) and 39.2% at the tangential direction of (139.7 degrees, 0 degrees). The conversion efficiency of the GdCOB crystal at the (114.1 deg., 32 deg.) tangential direction is 39.8%, and the conversion efficiency at the (146.4 deg., 0 deg.) tangential direction is 31.5%.
Drawings
Fig. 1 is a schematic structural diagram of a main body of an ultrashort pulse laser in embodiment 5 of the present invention.
FIG. 2 is a series of frequency-doubled phase-matching curves in the principal planes of YCOB crystals and GdCOB crystals in example 1 of the present invention.
FIG. 3 shows the 1.64 μm-class frequency-doubled phase-matching curves of YCOB crystal and GdCOB crystal and the corresponding d eff Curve line.
Fig. 4 is a graph showing the phase matching angles of four tangential crystals as a function of the fundamental wavelength in example 2 of the present invention.
FIG. 5 is a frequency doubling spectrum of the fundamental frequency and the YCOB and KDP crystals in example 3 of the present invention.
Wherein: 1. the device comprises a light source, 2 fundamental frequency light, 3 a focusing lens, 4 a special corner cut broadband frequency doubling device, 5 a color filter and 6 frequency doubling light.
Detailed Description
The invention is further described below by reference to the drawings and examples of the specification, but is not limited thereto.
Example 1
A broadband frequency multiplier with special cut angle comprises a YCOB crystal or a GdCOB crystal as a chemical component, and a polar coordinate (theta, phi) is used for describing the space direction of the YCOB crystal or the GdCOB crystal, wherein theta is an included angle between the direction and an optical principal axis Z, and phi is an included angle between a projection of a direction vector in an XY principal plane and an X axis, namely an azimuth angle; the device is obtained for a YCOB crystal at a cut angle of (113 °,25.9 °), or a gdcoob crystal at a cut angle of (114.1 °,32 °). The folding point exists on the frequency doubling phase matching curve in the interval of 1.55-1.7 mu m, and high-efficiency and broadband frequency doubling output can be realized.
The crystal size of the device is 6 multiplied by 10mm 3 I.e. byThe lengths of the YCOB crystal and the GdCOB crystal in the light passing direction are 10mm. When the wavelength of fundamental light is increased from 1550nm to 1700nm, the variation of the corresponding phase matching angle phi of the YCOB crystal at the tangential direction of (113 degrees, 25.9 degrees) is only 0.3 degrees, and theta is unchanged; the GdCOB crystals at the (114.1 degree, 32 degree) tangential direction have a variation of only 0.1 degree corresponding to the phase matching angle phi, and theta is not changed.
The YCOB crystal and the GdCOB crystal act as monoclinic system biaxial crystals, and the phase matching conditions are determined by parameters (theta, phi) together. Based on the dispersion equations of the YCOB and gdcoob crystals, the change law of the phase matching angle in the principal plane with the wavelength of the fundamental light is calculated for the frequency doubling (ω + ω → 2 ω) process, as shown in fig. 2, the solid line is the gdcoob crystal, and the dotted line is the YCOB crystal. From this, it was confirmed that the spectral noncritical frequency doubling matching angle of the YCOB crystal was (139.7 °,0 °) and the spectral noncritical frequency doubling matching angle of the gdcoob crystal was (146.4 °,0 °) in the principal plane.
Effective nonlinear coefficient d eff The phase matching angle of YCOB crystal and GdCOB crystal at 1640nm and d are related to the phase matching angle (theta, phi) eff The curve is shown in FIG. 3, in which a represents YCOB crystals and b represents GdCOB crystals. D of YCOB crystal at (113 deg., 25.9 deg.) tangential direction eff Maximum, 1.55pm/V, d at a tangent (139.7 DEG, 0 DEG) to the principal plane eff The size is only 1.23pm/V; d of GdCOB crystal at tangential direction of (114.1 deg., 32 deg.) eff Maximum, 1.52pm/V, d tangential to the principal plane (146.4, 0 deg.) eff The size was only 1.1pm/V.
Therefore, the particular cut angles selected for the present invention are (113 °,25.9 °) for YCOB crystals and (114.1 °,32 °) for gdcoob crystals.
Example 2
When the wavelength of fundamental light varies in the range of 1550-1700nm, the variation of the phase matching angle phi corresponding to the YCOB crystal at the tangential direction (113 deg., 25.9 deg.) is 25.9 deg. -26.2 deg., and theta is constant, as shown in fig. 4 (a); the variation of the phase matching angle θ of the (139.7 °,0 °) tangential YCOB crystal was 139.7 ° -139.9 °, phi was constant, as shown in fig. 4 (b); the GdCOB crystals in the tangential direction (114.1 degrees and 32 degrees) have the corresponding change of the phase matching angle phi of 32 degrees to 32.1 degrees and the theta is unchanged, as shown in FIG. 4 (c); the variation of the corresponding phase matching angle theta of the GdCOB crystals at the tangential direction of (146.4 DEG, 0 DEG is 146.4 DEG-146.9 DEG, phi is not changed, as shown in FIG. 4 (d).
When the wavelength of fundamental light is changed in the range of 1550-1700nm, the phase matching angles of YCOB crystals and GdCOB crystals in four different planes are all changed within 0.5 degrees, and excellent broadband frequency doubling characteristics are shown. Fig. 4 shows theoretical calculation results and actual measurement results of phase matching angles in the wavelength range of 1500-1800nm, which are basically consistent with each other, and errors may be generated in multiple aspects, such as measurement and fitting accuracy of a dispersion equation, crystal orientation and processing accuracy, and collimation degree of an experimental optical path.
Example 3
An ORPHEUS-HP type tunable femtosecond laser of Light Conversion company is used as a fundamental frequency Light source, and fundamental frequency spectrums with different wavelengths are recorded by a spectrometer, as shown in fig. 5 (a), the half-peak widths of spectrums with the wavelength of 1064nm are 15nm,1550nm, 1600nm, 1650nm and 1700nm and are 22 +/-1 nm; the frequency doubling spectrum is as shown in fig. 5 (b), common frequency doubling is performed on 1064nm fundamental frequency light by using (113 degrees, 37.4 degrees) tangential YCOB crystals, the obtained half-peak width of a 532nm spectrum is 3nm, near-light spectrum non-critical or spectrum non-critical frequency doubling is performed on 1550nm, 1600nm, 1650nm and 1700nm by using (113 degrees, 25.9 degrees) tangential YCOB crystals, and the obtained half-peak widths of 775nm, 800nm, 825nm and 850nm spectra are 14 +/-1 nm; the inset in fig. 5 (b) is the 775nm spectrum obtained using ordinary frequency doubling of the 1550nm fundamental light with a (52.6 °,45 °) tangential KDP crystal, with a half-peak width of 4nm.
From the above data, the conversion rate of the spectral width of the ordinary frequency doubling ((113 °,37.4 °) tangential and 1064nm frequency doubling) of the YCOB crystal is 20%, and the conversion rate of the spectral width of the ordinary frequency doubling ((52.6 °,45 °) tangential and 1550nm frequency doubling) of the KDP crystal is 18%, whereas the conversion rate of the spectral width of the non-critical frequency doubling ((113 °,25.9 °) tangential and 1550-1700nm frequency doubling) of the YCOB crystal spectrum of the present invention is as high as 64%, showing a significant advantage of broadband frequency doubling.
Example 4
The frequency doubling conversion efficiency of the YCOB crystals at the (113 °,25.9 °) tangential direction is greater than that at the (139.7 °,0 °) tangential direction, and the frequency doubling conversion efficiency of the gdcoob crystals at the (114.1 °,32 °) tangential direction is greater than that at the (146.4 °,0 °) tangential direction, as shown in table 1.
TABLE 1
Tangential crystal Input＝40mW Input＝60mW Input＝80mW Input＝100mW
YCOB(113°,25.9°) 28.3％ 36.3％ 43.9％ 51.4％
YCOB(139.7°,0°) 19.4％ 25.5％ 31％ 39.2％
GdCOB(114.1°,32°) 21.8％ 28.9％ 35.6％ 39.8％
GdCOB(146.4°,0°) 13.2％ 19.7％ 25.9％ 31.5％
The data in table 1 show that the efficiency of the special tangential spectral noncritical phase matching is higher and the application is more beneficial than the traditional tangential spectral noncritical phase matching mode of the main plane.
When the wavelength of fundamental frequency light is 1650nm, the average power is 40mW, the repetition frequency is 100kHz, and the pulse width is 160fs, the frequency doubling conversion efficiency of the YCOB crystal is 28.3 percent at the tangential direction of (113 degrees, 25.9 degrees) and 19.4 percent at the tangential direction of (139.7 degrees, 0 degrees). The GdCOB crystal has a frequency doubling conversion efficiency of 21.8% at the (114.1 deg., 32 deg.) tangential direction and 13.2% at the (146.4 deg., 0 deg.) tangential direction.
When the wavelength of fundamental frequency light is 1650nm, the average power is 60mW, the repetition frequency is 100kHz, and the pulse width is 160fs, the frequency doubling conversion efficiency of the YCOB crystal is 36.3 percent at the tangential direction of (113 degrees, 25.9 degrees) and 25.5 percent at the tangential direction of (139.7 degrees, 0 degrees). The GdCOB crystal has a double frequency conversion efficiency of 28.9% at the (114.1 deg., 32 deg.) tangential direction and 19.7% at the (146.4 deg., 0 deg.) tangential direction.
When the wavelength of fundamental frequency light is 1650nm, the average power is 80mW, the repetition frequency is 100kHz, and the pulse width is 160fs, the frequency doubling conversion efficiency of the YCOB crystal is 43.9% at the tangential direction of (113 degrees, 25.9 degrees) and 31% at the tangential direction of (139.7 degrees, 0 degrees). The GdCOB crystal has a frequency doubling conversion efficiency of 35.6% at the (114.1 deg., 32 deg.) tangential direction and 25.9% at the (146.4 deg., 0 deg.) tangential direction.
When the wavelength of fundamental frequency light is 1650nm, the average power is 100mW, the repetition frequency is 100kHz, and the pulse width is 160fs, the frequency doubling conversion efficiency of the YCOB crystal is 51.4% at the tangential direction of (113 degrees, 25.9 degrees) and 39.2% at the tangential direction of (139.7 degrees, 0 degrees). The GdCOB crystal has a double frequency conversion efficiency of 39.8% at the (114.1 deg., 32 deg.) tangential direction and 31.5% at the (146.4 deg., 0 deg.) tangential direction.
It can be seen that the frequency doubling conversion efficiency of the broadband frequency doubling device with the special cutting angle is obviously higher than that of a tangential crystal in the main plane of the nonlinear optical crystal.
Example 5
As shown in fig. 1, an ultrashort pulse laser includes a light source 1, a focusing lens 3, a special corner-cut broadband frequency multiplier 4 and a color filter 5, which are sequentially disposed along a propagation direction of a light path;
the broadband frequency multiplier 4 with the special corner cut is the device in embodiment 1;
the focusing lens is plated with a 1400-1800nm broadband antireflection film;
the color filter is plated with a 1400-1800nm broadband high reflection film and a 700-900nm broadband antireflection film.
When the fundamental frequency light 2 with the central wavelength range of 1550-1700nm is focused by the focusing lens 3, the broadband frequency doubling device 4 with the special cutting angle converts the fundamental frequency light 2 into the frequency doubling light 6, the residual fundamental frequency light 2 and the frequency doubling light 6 pass through the color filter 5 simultaneously, wherein the fundamental frequency light 2 is reflected, and the frequency doubling light 6 is output by passing through the color filter 5.

Claims (10)

1. A broadband frequency multiplier with special cut angles is characterized in that the chemical composition of the broadband frequency multiplier is YCOB crystals or GdCOB crystals, the spatial direction of the YCOB crystals or the GdCOB crystals is described by polar coordinates (theta, phi), theta is an included angle between the direction and an optical principal axis Z, and phi is an included angle between a projection of a direction vector in an XY principal plane and an X axis, namely an azimuth angle; the device is obtained for a YCOB crystal at a cut angle of (113 °,25.9 °), or a gdcoob crystal at a cut angle of (114.1 °,32 °).
2. The special-chamfer broadband frequency multiplier device according to claim 1, wherein said special-chamfer broadband frequency multiplier device is capable of realizing broadband frequency multiplication of fundamental frequency laser light having a center wavelength in the range of 1550-1700 nm.
3. The special-cut-angle broadband frequency multiplier according to claim 1, wherein the special-cut-angle broadband frequency multiplier has a break-back point in a phase matching curve of a (113 °,25.9 °) tangential YCOB crystal or a (114.1 °,32 °) tangential gdcoob crystal in a 1.55-1.7 μm band, and can realize high-efficiency and broadband frequency multiplication output.
4. The special-cut-angle broadband frequency multiplier of claim 1, wherein the phase matching angle of the (113 °,25.9 °) tangential YCOB crystal varies by 0.3 ° and (114.1 °,32 °) tangential gdcoob crystal varies by 0.1 ° during the wavelength of the fundamental light increases from 1550nm to 1700nm during broadband frequency multiplication using the special-cut-angle broadband frequency multiplier.
5. The special-cut wide-band frequency doubler device according to claim 1, characterized in that the size of the YCOB crystal or gdcoob crystal is 6 x 10mm 3 。
6. Use of the special cut-angle broadband frequency doubling device of claim 1 in ultrashort pulse lasers.
7. An ultrashort pulse laser, comprising a light source, a focusing lens, the special corner-cut broadband frequency multiplier device of claim 1, and a color filter, which are sequentially disposed along a propagation direction of an optical path.
8. An ultrashort pulse laser as claimed in claim 7, wherein the focusing lens is coated with a broadband antireflection film of 1400-1800 nm.
9. The ultrashort pulse laser as claimed in claim 7, wherein the color filter is plated with a 1400-1800nm broadband high reflection film and a 700-900nm broadband antireflection film.
10. The ultrashort pulse laser as claimed in claim 7, wherein the spectral bandwidth of the frequency doubled light of the broadband frequency doubling device with special cut angle is 14 ± 1nm when the spectral bandwidth of the fundamental light is 22 ± 1nm.
CN202110706983.0A 2021-06-24 2021-06-24 Special-corner-cut broadband frequency multiplier and application thereof Pending CN115528528A (en)

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