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Optical element

A technology of optical devices and light propagation direction, applied in the field of YAG lasers, which can solve problems such as obstacles to high output of solid-state lasers

Inactive Publication Date: 2005-06-01
JAPAN SCI & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] These phenomena become a big obstacle when the output of solid-state lasers such as YAG is increased.

Method used

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Embodiment Construction

[0031] Hereinafter, embodiments of the present invention will be described in detail.

[0032] First, the first embodiment of the present invention is shown, and the reduction of thermally induced birefringence depolarization in a (100) cut YAG crystal will be described.

[0033] YAG is the starting cubic crystal, and when the propagation direction of light is perpendicular to the (111) plane, the heat distribution axis is symmetrical, and the thermal birefringence in the crystal plane becomes constant regardless of the angle.

[0034] On the other hand, all except the (111) plane have angle dependence.

[0035] figure 1 is a graph showing the measurement results regarding the direction dependence of depolarized polarized light. Here, the horizontal axis represents the polarization angle θp (degrees), and the vertical axis represents the depolarization D pol . figure 2 is a calculation result graph showing the dependence of depolarization on the absorbed excitation power ...

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Abstract

Optics are provided that substantially reduce the effects of thermal birefringence. In optics, by using (110) cut crystals, the depolarization due to thermal birefringence can be greatly reduced with little compensation. Compared with (111) cut crystals, the depolarization can be reduced by more than an order of magnitude.

Description

field of invention [0001] The present invention relates to optical devices, in particular to YAG lasers. Background technique [0002] Conventionally, there are many reference documents related to the present invention as shown below. [0003] [1]: W. Koechner, Solid-State Laser Engineering (Springer Verlag, Berlin.1996), pp.393-412. [0004] [2]: W.C.Scott and M.de Wit, "Birefringence compensation and TEM 00 mode enhancement in a Nd:YAG laser,"Appl.Phys.Lett.18, 3-4(1971). [0005] [3]: K.Yasui, "Efficient and stable operation of a high-brightnesscw 500-W Nd:YAG rod laser," Appl.Opt.35, 2566-2569(1996). [0006] [4]: W.A. Clarks on, N.S. Felgate, and D.C. Hanna, "Simple method for reducing the depolarization loss resulting from thermally induced birefringence in solid-state lasers," Opt. Lett. 24.820-822(1999). [0007] [5]: W.Koechner and D.K.Rice, "Effect of birefringence on the performance of linearly polarized YAG:Nd lasers," IEEE J.QuantumElectron.QE-6, 557-566(19...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30H01S3/06H01S3/08H01S3/16
CPCH01S3/0602H01S3/08072H01S3/16H01S3/1643H01S3/05
Inventor 平等拓范庄司一朗
Owner JAPAN SCI & TECH CORP