CN2463992Y - Triangle annular cavity frequency doubler - Google Patents

Abstract

The utility model relates to a triangular annular cavity frequency doubler, which comprises an input reflecting mirror and an output reflecting mirror which are arranged both end reflecting surfaces of a frequency doubling crystal and arranged corresponding to the frequency doubling crystal in an eight figure shape, wherein, the intersection points of the reflected beams of the two reflecting mirrors are provided with an equicrural triangular prism. The bottom edge of the equicrural triangular prism faces to the frequency doubling crystal, and the apical angle is arranged on piezoelectric ceramics with a control unit. Fundamental frequency light transmits the input reflecting mirror and transmits the output reflecting mirror through the frequency doubling light of the frequency doubling crystal to be radiated out. The fundamental frequency light which is not converted is completely reflected into the prism through the output reflecting mirror, and is reflected to the frequency doubling crystal again after refracted to the prism by the prism. Thereby, the triangular annular cavity is formed. With simple structure, the utility model reduce the loss of the fundamental frequency light.

Description

Triangle annular chamber frequency multiplier

The utility model is a kind of triangle annular chamber frequency multiplier, be applicable to various continuously or the frequency multiplication of quasi-continuous lasing, be specially adapted to continuous semiconductor laser pumping Solid State Laser (DPSS) frequency multiplication and produce Ultra-Violet Laser.

The generation of Ultra-Violet Laser, a kind of structure are by the Excimer UV laser, and another kind is the non-linear frequency conversion by crystal.And the frequency inverted of continuous laser only adopts the conversion efficiency of monocrystal lower, the suitable annular chamber frequency multiplier that adopts.Four mirror folded coil chambeies are formerly arranged (referring to technology [1] S.Bourezeix formerly in the technology, B.Beauvior, Ultra-violet light generation at 205nm by two frequency doubling steps ofa cw titanium-sapphire laser, Optics Communication, 133 (1997) 239-244, ELSEVIER) and four mirror rectangular loop chambeies (referring to technology [2] Hidemi TSUCHA formerly, Frequency doubling oftunable Ti:Sapphire laser with KNbO ₃In external cavity, Jpn.J.Appl.Phys.Vol33 (1994) 6190-6194).But four used mirror annular chambers are regulated difficulty, regulate the several times speculum simultaneously, and operating both bothered, time-consuming again, and big to the loss of fundamental frequency light.

The purpose of this utility model: regulate difficulty and the shortcoming big in order to overcome formerly in the technology four mirror annular chambers, a kind of frequency multiplier of triangle annular chamber is provided to the fundamental frequency optical loss.It will make the fundamental frequency optical loss little, simple in structure, easy to adjust.

Triangle annular chamber frequency multiplier of the present utility model comprises: frequency-doubling crystal 3, be equipped with the center on frequency-doubling crystal 3 central axis at an end of frequency-doubling crystal 3, and be coated with fundamental frequency light G to LASER Light Source 1 emission _JTransmitance is 50%, to frequency doubled light G _BThe input reflection mirror 2 of total reflection medium film.The other end at frequency-doubling crystal 3 is equipped with the center on frequency-doubling crystal 3 central axis, is coated with fundamental frequency light G _JTotal reflection is to frequency doubled light G _BFull impregnated is crossed the output reflector 4 of deielectric-coating.Place the input reflection mirror 2 at frequency-doubling crystal 3 two ends and two reflectings surface of output reflector 4 to be herringbone or splayed with respect to frequency-doubling crystal 3.Be equipped with the prism 5 of isosceles triangle at the intersection point place of two reflecting surface folded light beams of input reflection mirror 2 and output reflector 4.The base of prism 5 is facing to frequency-doubling crystal 3.The drift angle of prism 5 places on the piezoelectric ceramic 6 of tape controller 7.As shown in Figure 1:

As above-mentioned structure, as the fundamental frequency light G of LASER Light Source 1 emission _JAfter seeing through input reflection mirror 2 and injecting frequency-doubling crystal 3, because the frequency multiplication effect of frequency-doubling crystal 3 produces frequency doubled light G _B, frequency doubled light G _BSee through output reflector 4 backs and penetrate, and the fundamental frequency light G that is not transformed by frequency-doubling crystal 3 _JBe totally reflected on the prism 5 by output reflector 4, be refracted on the input reflection mirror 2, reflex on the frequency-doubling crystal 3 by input reflection mirror 2 again, through the frequency multiplication of frequency-doubling crystal 3, the frequency doubled light G of generation by prism 5 _BPenetrate the fundamental frequency light G that is not transformed by output reflector 4 again _jBe reflected to again and go back on the prism 5 on the input reflection mirror 2,, can obtain high efficiency frequency doubled light G so repeatedly in intracavity frequency doubling _BBe fixed on the piezoelectric ceramic 6 of tape controller 7 by the drift angle of epoxy resin, can adjust prism 5 by controller 7, thereby make frequency multiplier be operated in optimum state prism 5.

Frequency-doubling crystal 3 in the utility model frequency multiplier is non-linear frequency-doubling crystals, so frequency doubled light G _BGeneration be exactly the quadratic nonlinearity effect of utilizing in the non-linear frequency-doubling crystal, as fundamental frequency light G _JWhen enough strong, the polarization of crystal is just relevant with light intensity, and is not only linear.The nonlinear effect of a lot of crystal is very strong, can utilize these crystal to produce frequency doubled light.So frequency-doubling crystal 3 can be nonlinear crystal barium metaborate (BBO), or cesium lithium borate (CLBO), or potassium dihydrogen phosphate (KDP) etc.

For the frequency multiplication of continuous light, the generation coefficient of frequency multiplication can be expressed as: ${\mathrm{\&gamma;}}_{\mathrm{SH}}=\frac{{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="Y0121021700061.png"\; state="\{\{state\}\}">P</figure-callout>}}_{2\mathrm{\&omega;}}}{P_{\mathrm{\&omega;}}^2}=\frac{{2\mathrm{\&omega;}}^2{d}_{\mathrm{eff}}^2{k}_{\mathrm{\&omega;}}L}{\mathrm{\&pi;}{\mathrm{<figure-callout\; id="3"\; label="n"\; filenames="Y0121021700061.png"\; state="\{\{state\}\}">n</figure-callout>}}^3{\mathrm{\&epsiv;}}_0{c}^3}h(B,\mathrm{\&zeta;})\frac{w_z}{w_x}$ L is the length of crystal, ω and K _ωBe the angular frequency and the wave vector of fundamental frequency light, n is the crystal refractive index of phase matched direction, and (B ξ) is Bo Yi-Gidon Kremer (Boyd-Kleinman) function to h.The annular chamber frequency multiplication of continuous light can make full use of fundamental frequency light and frequency-doubling crystal, and very short frequency-doubling crystal places frequency multiplier can make repeatedly fundamental frequency light process, has enlarged the frequency multiplication zone of action.And prism 5 usefulness are done the refraction to fundamental frequency light, replace formerly changing the fundamental frequency light direction with two speculums in the technology [2], make frequency multiplier of the present utility model simple in structure like this, and light path has shortened, and is little to the loss of fundamental frequency light, and easy to adjust.

Advantage of the present utility model: as mentioned above, triangle annular chamber frequency multiplier of the present utility model has simple in structure, is easy to control, the light path compactness, the efficient height is to advantage such as the loss of fundamental frequency light is little, and can the more frequency doubled light of high-order will be obtained by a plurality of triangular ring cavities of cascade.

Description of drawings:

Fig. 1 is the structural representation of triangle annular chamber frequency multiplier of the present utility model

Embodiment:

Triangle annular chamber frequency multiplier as shown in Figure 1, fundamental frequency light G _JBe that Wavelength of Laser is 1064nm as the continuous laser of semiconductor pumped yttrium-aluminium-garnet (YAG) the laser generation of LASER Light Source 1, laser power is 500mW, is output as TEM ₀₀Mould, input reflection mirror 2 is to be coated with fundamental frequency 1064nm light 30 degree 50% are seen through, glass lens to the deielectric-coating of 532nm frequency doubled light total reflection, frequency-doubling crystal 3 is φ=0 ° of 5 * 5 * 7mm, the bbo crystal of θ=49 °, output reflector 4 be coated with to the total reflections of fundamental frequency 1064nm light 30 degree to 532nm frequency doubled light full impregnated cross deielectric-coating glass lens, prism 5 is 60 degree equilateral triangle K9 glass prisms, the parameter of the frequency multiplication 532nm laser of output is:

Wavelength: 532nm

Power: 25mW

Bundle waveform:＞95% Gaussian

Mode structure: single transverse mode, TEM ₀₀Exported frequency doubled light G by present embodiment _BParameter can prove above-mentioned advantage of the present utility model.

Claims (1)

1. triangle annular chamber frequency multiplier comprises:

＜1〉frequency-doubling crystal (3) is arranged, be equipped with the center on frequency-doubling crystal (3) central axis, be coated with fundamental frequency light (G LASER Light Source (1) emission at an end of frequency-doubling crystal _J) transmitance is 50%, to frequency doubled light (G _B) the input reflection mirror (2) of total reflection medium film, be equipped with the center on frequency-doubling crystal (3) central axis at the other end of frequency-doubling crystal (3), be coated with fundamental frequency light (G _J) total reflection, to frequency doubled light (G _B) full impregnated crosses the output reflector (4) of deielectric-coating;

It is characterized in that:

＜2〉place the input reflection mirror (2) at frequency-doubling crystal (3) two ends and two reflectings surface of output reflector (4) to be herringbone or splayed with respect to frequency-doubling crystal (3):

＜3〉be equipped with the prism (5) of isosceles triangle at the intersection point place of two reflecting surface folded light beams of input reflection mirror (2) and output reflector (4);

＜4〉base of prism (5) is facing to frequency-doubling crystal (3), and the drift angle of prism (5) places on the piezoelectric ceramic (6) of tape controller (7).

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