CN202904405U

CN202904405U - Temperature control device for nonlinear optical crystals

Info

Publication number: CN202904405U
Application number: CN 201220602428
Authority: CN
Inventors: 朱友本; 郑熠; 吴少凡
Original assignee: Fujian Castech Crystals Inc
Current assignee: Fujian Castech Crystals Inc
Priority date: 2012-11-15
Filing date: 2012-11-15
Publication date: 2013-04-24
Anticipated expiration: 2022-11-15

Abstract

The utility model relates to a temperature control device for nonlinear optical crystals. The temperature control device for nonlinear optical crystals comprises TEC; the TEC is fixed on a thermal insulation layer; the outer layer of an inner core is coated with a thermal conductive pad; the inner core is fixed inside the thermal insulation layer; the thermal insulation layer is fixed inside the shell; one end of the shell is opened and one end is sealed; the opened end of the shell is provided with a matched end cover; a crystal support can be inserted in the inner core; the crystal support is fixed in the inner core via a baffle ring and a baffle rod; the TEC is fixed inside the inner core; and one surface of the TEC is closely contacted with the copper shell, and the other surface of the TEC is contacted with the inner core via the thermal conductive pad. The temperature control device provided by the utility model overcomes the defect that the traditional temperature control device can only raise the temperature, is simple in structure, low in manufacturing cost, and can be suitable for batch production.

Description

A kind of nonlinear optical crystal attemperating unit

Technical field

The utility model belongs to laser technology field, particularly relates to a kind of crystal attemperating unit.

Background technology

For some nonlinear optical crystal, the e optical index variation with temperature of crystal such as lithium niobate, potassium dihydrogen phosphate is more faster than the refractive index of o light, utilize this characteristic, equal under 90 ° of conditions at phase matching angle, just might realize phase matching by suitable adjusting temperature.Phase matching angle equals 90 ° phase matching special advantage, can avoid having influence on because of the walk-off angle of o light and e light on the one hand the conversion efficiency of frequency doubled light; Can make again on the other hand because of the caused phase mismatch of beam divergence and greatly reduce.When phase matching angle is not equal to 90 °, then the angle of divergence of light beam will cause phase mismatch immediately.

Semiconductor cooler TEC utilizes the Peltier effect of semiconductor material to make.So-called Peltier effect refers to when DC current is passed through the galvanic couple of two kinds of semiconductor materials compositions the heat absorption of one end, the phenomenon of an end heat release.Mainly as the semiconductor material of TEC, the bismuth telluride element adopts the electricity series connection to the bismuth telluride of heavily doped N-type and P type, and is parallel heating.TEC comprises some P types and N-type pair, and they connect together by electrode, and are clipped between two ceramic electrodes; When having electric current to flow through from TEC, the heat that electric current produces can pass to opposite side from the side of TEC, produces " heat " side and " cold " side at TEC, heating and the refrigeration principle of Here it is TEC.Refrigeration or heating, and the speed of refrigeration, heating, decided by direction of current and size by it.The thermoelectric effect that a pair of galvanic couple produces is very little, so all with up to a hundred thermopair is cascaded in practice, all cold junctions concentrate on one side, and the hot junction concentrates on another side, produces like this refrigerator for reality.

What traditional nonlinear crystal attemperating unit adopted is the method for Resistant heating, and the defective of this method is and can only heats to crystal that when environment temperature was equal to or less than crystal temperature effect, temperature controller will be ineffective.

Summary of the invention

In order to overcome the defective of conventional art, the invention provides a kind of nonlinear optical crystal attemperating unit, comprise TEC, described TEC is fixed on the heat-insulation layer, described inner core skin is enclosed with heat conductive pad, described inner core is fixed on heat-insulation layer inside, described heat-insulation layer is fixed in the shell, described shell one end opening one end sealing, described shell aperture one end has the end cap that matches with it, can insert crystal cartridge in the described inner core, described crystal cartridge is fixed among the inner core by baffle ring and gear stick, described TEC is fixed among the inner core, TEC one side and copper shell close contact, and the TEC another side contacts with inner core by heat conductive pad.

The principle of work of this device is that TEC adopts bidirectional temperature control, namely when extraneous normal temperature and high temperature crystal is freezed, and then crystal is heated when ambient temperature is low; By switching the direction of current of semiconductor cooler, cold junction originally and the position in hot junction just can exchange.When crystal need to heat, the one side of TEC cooling piece and crystal cartridge 8 close contacts became hot face, conducts heat to crystal by crystal cartridge 8, thereby had reached the purpose of heating crystal; When crystal need to freeze, the one side of TEC cooling piece and crystal cartridge 8 close contacts became chill surface, by crystal cartridge 8 heat that crystal produces was transmitted to the chill surface of TEC cooling piece, thereby had reached the purpose of crystals cooled.

Adopt the utility model can under different temperature conditions, control easily the temperature of nonlinear optical crystal, thereby greatly reduce the volume of laser instrument, and simple in structure, cost of manufacture is low, is fit to batch production.

Description of drawings:

Fig. 1 is the structural representation of a kind of nonlinear optical crystal attemperating unit of the present invention

Wherein 1 is shell, the 2nd, and heat-insulation layer, the 3rd, baffle ring, the 4th, TEC, the 5th, heat conductive pad, the 6th, thermistor, the 7th, inner core, the 8th, crystal cartridge, the 9th, gear stick, the 10th, insulating ring, the 11st, end cap.

Embodiment

As shown in Figure 1, inner core 7 has a groove, with silica gel thermistor 6 is encapsulated in inside grooves, at the outside of inner core 7 parcel one deck heat conductive pad 5, again TEC4 is fixed on the inner core, inner core 7, baffle ring 3, crystal cartridge 8, gear stick 9 and insulating ring 10 are put into heat-insulation layer 2 successively, heat-insulation layer 2 is contained in the shell 1, and shell 1 and end cap 11 are fixed together by screw thread, this structure have make simple, the advantages such as crystal is heated evenly, and the inner core heat-insulating property is good.

Claims

1. nonlinear optical crystal attemperating unit, comprise TEC, described TEC is fixed on the heat-insulation layer, described inner core skin is enclosed with heat conductive pad, described inner core is fixed on heat-insulation layer inside, described heat-insulation layer is fixed in the shell, described shell one end opening one end sealing, described shell aperture one end has the end cap that matches with it, can insert crystal cartridge in the described inner core, described crystal cartridge is fixed among the inner core by baffle ring and gear stick, it is characterized in that: described TEC is fixed among the inner core, TEC one side and copper shell close contact, the TEC another side contacts with inner core by heat conductive pad.