Intermediate infrared laser

A laser and infrared technology, applied in the field of mid-infrared lasers, can solve problems such as limiting conversion efficiency, and achieve the effect of improving conversion efficiency, high conversion efficiency and good tuning.

Inactive Publication Date: 2012-07-11
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Although the wavelength of the idle light generated by OPO in this way is around 3 μm, the wavelength of the accompanying signal light is around 1.5 μm, so the signal light is not the desired mid-infrared laser, which fundamentally limits the conversion efficiency

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the scope of the present invention should not be limited thereto.

[0023] see first figure 1 , figure 1 It is a structural schematic diagram of an embodiment of the mid-infrared laser of the present invention. It can be seen from the figure that the mid-infrared laser of the present invention includes a semiconductor laser 101, along the laser output direction of the semiconductor laser 101, there are beam shaping and coupling system 102, input cavity mirror 103, laser crystal 104, acousto-optic Q-switching switch 105, thick Etalon 106, thin etalon 107, output cavity mirror 108, filter plate 109, isolator 110, half-wave plate 111, focusing lens 112, OPO incident cavity mirror 113, MgO-doped PPLN114 and OPO output cavity mirror (115), Its characteristics are:

[0024] Described laser crystal 104 is Tm:YLF crystal, and described input cavity mirror ...

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Abstract

The invention discloses an intermediate infrared laser. The intermediate infrared laser is characterized in that: a semiconductor laser with the wavelength of 790nm is used for pumping a thulium doped lithium yttrium fluoride (Tm:YLF) crystal to obtain 1.9 mu m laser; and 1.9 mu m pulsed laser is generated in an acousto-optical Q-switching way. Two quartz etalons unplated with a dielectric film are arranged in a Tm:YLF laser, so that the spectrum width of the output 1.9 mu m laser is decreased to less than 1nm, and the output laser is stabilized at the central wavelength of 1,907.5nm, and can be prevented from being absorbed by water molecules in the atmosphere; and the laser is used as a pump source for pumping a magnesium oxide (MgO) doped periodically poled lithium niobate (MgO:PPLN) crystal, and stable intermediate infrared laser output with the wavelengths of 3 to 5 mu m is obtained in an optical parametric oscillation way. The intermediate infrared laser has the characteristics of simple structure, high conversion efficiency, high tunability and the like.

Description

technical field [0001] The invention relates to the technical field of mid-infrared lasers, and specifically designs a mid-infrared laser. Background technique [0002] At the end of the 1980s, birefringent nonlinear crystals with wide transparency, high damage threshold, and suitable matching angles were introduced into β-phase barium metaborate crystals (β-BaB 2 o 4 , hereinafter referred to as BBO), potassium titanyl phosphate (Potassium Titanyl Phosphate, hereinafter referred to as KTP) and the emergence of stable and reliable yttrium aluminum garnet crystal (referred to as Nd:YAG) laser pumping source, making the visible to near-infrared band The optical parametric oscillator (Optical Parametric Oscillator, hereinafter referred to as OPO) technology develops rapidly and gradually tends to be practical. Since the mid-1990s, high-quality nonlinear crystalline Silver Gallium Sulfide (Silver Gallium Sulfide, hereinafter referred to as AgGaS) with a large nonlinear coeffic...

Claims

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Application Information

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IPC IPC(8): H01S3/0941H01S3/108H01S3/117
Inventor 徐林周军陈卫标
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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