CN2289806Y

CN2289806Y - Carrier crystal stand and its seed crystal for potassium dihydrogen phosphate large single crystal growing

Info

Publication number: CN2289806Y
Application number: CN96206397U
Authority: CN
Inventors: 黄炳荣; 苏根博
Original assignee: Fujian Institute of Research on the Structure of Matter of CAS
Current assignee: Fujian Institute of Research on the Structure of Matter of CAS
Priority date: 1996-03-13
Filing date: 1996-03-13
Publication date: 1998-09-02
Anticipated expiration: 2006-03-13

Abstract

The utility model relates to a carrier crystal stand for the large single crystal growth of potassium dihydrogen phosphate (whose chemical formula is KH2PO4, KDP for short); the stand whose cross section likes a double-I shape is made of stainless steel plates or nylon plates or organic plates with the thickness 0.8 mm.; the stand is composed of a transverse plate (3), a left side plate (1), a right side plate (4), a seed crystal rod (2) and a seed crystal (5). The carrier crystal stand is matched with a seed crystal which is cut according to the II class 46 DEG to 80 DEG under the wavelength of 1.06 mu m comprising the crystallographic planes of (101) (8) and (100) (7), and is easy to grow a transparent large size crystal with good quality; the utility model is also suitable for the growth of a same type crystal of a KDP type (DKDP, ADP).

Description

Carrier crystal stand that the potassium primary phosphate large single crystal growth is used and seed crystal thereof

The utility model relates to potassium primary phosphate (KH ₂PO ₄Be called for short KDP) large single crystal growth, relate in particular to seed crystal particular orientation and carrier crystal stand thereof that this crystal growth is used.

Usually the used seed crystal of growth potassium dihydrogen phosphate crystal generally all adopts Z to cut 90 ° or Z and cuts 45 ° and tetragonal pyramid as seed crystal.In these seed orientations, no matter adopt problems such as any, the cycle that all exists is long, efficient is low, operation inconvenience for the large size KDP crystal that growth is badly in need of.At first, Z cuts 90 ° seed crystal will repeatedly just might become larger-size seed wafer by expanding species repeatedly, and will revert to awl again when carrying out single crystal growing with this seed wafer.Will consume a large amount of KDP solid materials when becoming awl, and the crystalline cone part can not be used (general awl length account for crystal length overall about 1/3) again for optics, and Z is slow to the speed of growth in addition.Secondly, if the seed orientation that adopts Z to cut 45 ° is carried out single crystal growing, though can reduce some processing links, growth efficiency is too low.Because the seed wafer of cutting 45 ° with Z is grown, in fact only equal natural conical surface of KDP crystalline in growth, not only the speed of growth is slow but also utilization ratio is low, and the crystal that is grown out is the oblique KDP crystal that does not contain cylinder.And laser fusion engineering and refreshing electro-optical device need with KDPII class frequency tripling device be about 59 °, required effective crystal position is 2/3 left and right sides (see figure 1) that contains KDP (100) or (010) cylinder just.So cut the KDP utilization ratio of 45 ° of seeded growths with this Z too low.At last a kind of is the seeded growth of band awl, its shortcoming is the KDP crystal that needs long much sizes, just must bore seed crystal with the band of much sizes, and these band awl seed size are big more, just difficult more operation when sowing, bring stress or burst phenomenon also easily more, will deduct this a part of size of band conehead during use equally, this has just reduced utilization ratio.

In order to overcome the shortcoming that above traditional KDP crystal growth seed crystal is orientated, the utility model proposes seed wafer and a kind of special this seed orientation growing large-size KDP crystalline carrier crystal stand that is fit to that KDP crystal Z cuts 46 °～80 ° of orientations, to reach the purpose that improves the speed of growth and crystal utilization ratio.

The utility model is mainly by the seed crystal of particular orientation be used for growing large-size crystalline carrier crystal stand two and partly form.The orientation of KDP seed crystal at first, adopt a complete crystalline transparent, incident light wave normal direction according to this crystal face becomes 59 ° of (see figure 2)s to cut with crystalline optical axis (C axle) again after the x-ray diffractometer orientation, be processed into the seed crystal of 10 * 10 * 3 (mm), it has comprised (101) and (100) crystal face.For being fixed on better on the carrier crystal stand, two apertures are bored in the centre of seed crystal.Secondly we to select thickness for use be the shelf that high-quality stainless steel plate about 0.8mm or materials such as nylon sheet or organic plates are made cross section such as П font, the height and the width of the area of its transverse slat (3), left plate (1) and right side plate (4) are decided on the size of required quartz crystal device, and transverse slat central authorities are seed rod (2) and seed crystal (5) fixedly.This carrier crystal stand can guide the KDP crystal growth, can the growth to crystalline (001) and (001) direction be limited (see figure 3) behind the growth certain hour again.The KDP seed crystal that will have particular orientation like this is fixed on the special carrier crystal stand, places the KDP saturated solution for preparing in advance that it is grown down or up, then can grow the KDP crystal of bulk.This crystal only need be parallel to basically when being used for optics that former seed crystal carries out the cutting of desired thickness and processing correction a little gets final product.The size of seed crystal and carrier crystal stand size can depend on the needs, little easy acquisition of seed crystal and recovery growth easily, crystal utilization ratio height.And carrier crystal stand can be made into 100 * 100～500 * 500 (mm) according to the actual needed crystal section size of optics.The utility model is equally applicable to the growth of KDP type crystalline such as (as DKDP, ADP).

Adopting the particular orientation of above-mentioned seed crystal and special carrier crystal stand to carry out large-scale KDP Crystal Growth has the following advantages:

1. the used seed crystal of the utility model is very little, obtains easily, and not needing is to enlarge the seed crystal repeated multiple times or growth is eliminated in the splicing of polylith seed crystal, can disposablely grow the KDP crystal of desired size.

2. because the required large size KDP crystalline frequency tripling device of laser fusion engineering is about 59 ° of II classes just, and this crystalline cutting angle and direction are also just in time across a conical surface (101) and a cylinder (100) (see figure 1) in the KDP crystal, so this utility model is the large-sized KDP crystal of suitable growth very.

3. adopt carrier crystal stand of the present utility model, limited KDP crystalline (001) and (001) direction growth (see figure 3), the neglecting required crystalline size greatly of carrier crystal stand and deciding.Crystal utilization ratio height with this carrier crystal stand growth can cut down perpendicular to the seeded growth direction by the thickness that quartz crystal device need use, and has reduced processing link.

4. reduced the consumption of KDP solid material in the solution, can be implemented in and grow large-sized practical crystal in the less aquarium, the cycle is short, has reduced labour intensity and cost consumption.

5. the KDP seed crystal particular orientation in employing the utility model is carried out single crystal growing, helps the best of breed coupling of the cylinder (100) and the conical surface (101) of crystal itself.The two has optimum growh speed and best service efficiency simultaneously to realize the cylinder and the conical surface.Cutting 45 ° more in the past than the Z that adopted freely grow or growth efficiency raising that directed guided mode is grown more than 2/3 times.Be fit to the KDP crystal solution condition of growth (open in 96103026.7 application cases that Patent Office of the People's Republic of China submits on 960215th) fast if can adopt, and adopt the utility model to carry out single crystal growing, its efficient will improve more than 10 times so.

Now three width of cloth accompanying drawings of the present utility model are done the drawing explanation: (6) of Fig. 1 are the orientation position synoptic diagram of KDP crystal frequency tripling device II class cutting; Fig. 2 is the particular orientation synoptic diagram of KDP seed crystal; Fig. 3 is the synoptic diagram of the carrier crystal stand of growth KDP large single crystal.

Embodiment 1, with a complete transparent KDP crystal, after x-ray diffractometer dead axle orientation, cut (about 59 °) according to the frequency tripling II class matching angle of KDP under 1.06 mum wavelengths, then the pane crystal that is cut down is made to go up mark in (001) and (001) direction, polish again and polish, can be processed into the square shape, thickness is about the seed wafer of 3mm, bores two apertures in the centre of wafer and is fixed on the carrier crystal stand.

After embodiment 2, the seed wafer that will cut and process are made clean, be fixed on the carrier crystal stand made from stainless steel plate with nylon rope, after can putting into the baking oven preheating by common growth method, immersion has been prepared and has been grown in the good KDP saturated solution of Overheating Treatment.Carrier crystal stand should be made into pattern as shown in Figure 3, so that confirmed seed crystal (001) and (001) two direction are limited when both sides wait to grow into desired size respectively; Other two directions then are crystalline (100) or (010) or (100) or (010) direction, i.e. cylinder direction growth is unrestricted.This carrier crystal stand also helps the homogeneity of saturation ratio in the stirring of solution and the crystal growth.Adopt the utility model in the aquarium of 10000ml, time in 35 ℃～80 ℃ KDP saturated solution about through 10 days, grown the above large size KDP crystal of 100 * 100 * 100 (mm), this crystal does not see that scattering particles are arranged after the He-Ne Lasers test of 5～8 milliwatts.

Claims

1. carrier crystal stand and the seed crystal thereof used of potassium primary phosphate large single crystal growth, it is characterized in that: with thickness is the shelf that stainless steel plate about 0.8mm is made cross section such as Π font, the area of its transverse slat (3), decide on the size of required quartz crystal device at the height and the width of side plate (1) and right side plate (4), transverse slat central authorities are seed rod (2) and seed crystal (5) fixedly.

2. carrier crystal stand and seed crystal thereof that potassium primary phosphate large single crystal growth as claimed in claim 1 is used is characterized in that: the also available nylon sheet of this carrier crystal stand is made.

3. carrier crystal stand and seed crystal thereof that potassium primary phosphate large single crystal growth as claimed in claim 1 is used is characterized in that: this carrier crystal stand also can be made with organic plates.

4. carrier crystal stand and the seed crystal thereof used of potassium primary phosphate large single crystal growth, it is characterized in that: form by 46 °～80 ° cuttings of II class under 1.06 mum wavelengths with the matching used seed crystal of this carrier crystal stand, and comprised the square shape of (101) (8) and (100) (7) crystal face.