Laser Light Source Apparatus
A laser light source, laser technology, applied in the direction of light sources, lasers, lighting devices, etc., can solve the problems of being unable to control and reduce the temperature of the wavelength conversion element 5, and achieve the effect of reducing the amount of reduction
Inactive Publication Date: 2014-09-24
USHIO DENKI KK
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Problems solved by technology
That is, in this state, even if the power supply to the heater is stopped, the temperature of the wavelength conversion element 5 cannot be lowered.
[0054] As described above, when the laser lighting current is increased according to the laser light quantity increase command, the heating amount of the wavelength conversion element 5 by the laser light also increases, and the temperature of the wavelength conversion element 5 may not be lowered to the optimum temperature, and cannot be controlled ( becomes a high temperature suspension state)
Method used
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Embodiment Construction
[0103] figure 1 It is a figure which shows the structure of the laser light source apparatus of the Example of this invention.
[0104] Such as figure 1 As shown, the laser light source device has a laser light source unit LH, a lighting circuit 20 for lighting a semiconductor laser, and a control unit 21 .
[0105] In the laser light source unit LH, a blocking container (for example, made of aluminum) 3 is mounted on a base plate (heat sink) substrate 1 made of a material with high thermal conductivity such as copper (Cu) to prevent leakage of laser light. , And, the components stored inside are blocked from the outside air and dust and insulated.
[0106] On the above-mentioned substrate 1 in the shielding container 3, a semiconductor laser 2 emitting infrared light as a fundamental wave light is provided. The semiconductor laser 2 is, for example, an external resonator type surface emitting laser array emitting at 1064 nm.
[0107] At a position opposite to the semico...
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The fundamental wave light emitted from a semiconductor laser is converted in wavelength by a wavelength conversion element and emitted therefrom. A lightning circuit lights the semiconductor laser, and a temperature control unit 21b controls the amount of electric power supply to a heater so that the temperature of the wavelength conversion element turns into temperature at which the wavelength conversion efficiency thereof becomes optimal. When a state where the amount of electric power supply of the heater is lower limit or below continues for a predetermined period or longer, the hang-up suppressing unit 21c, or when duration time in a state where the temperature of the wavelength conversion element is higher than the control target temperature becomes higher than a constant value, laser lighting current is decreased by a preset amount, thereby recovery from a high temperature hang-up state performed.
Description
technical field [0001] The present invention relates to a wavelength conversion type laser light source device using a nonlinear optical crystal. More specifically, it relates to a laser light source device characterized by a method of controlling temperature so as to maximize the conversion efficiency of the nonlinear optical crystal in a wavelength conversion laser light source using a nonlinear optical crystal. Background technique [0002] Devices using laser light are being developed as light sources of projection projectors used in movies, home theaters, and the like. As such laser light sources, there are known cases where light radiated directly from a semiconductor laser element is used, and cases where light radiated from the semiconductor laser element is converted into another wavelength by a nonlinear optical crystal for use. [0003] Recently, as a blue or green laser light source, the use of periodically polarized lithium niobate (PPLN: Periodically Poled Lit...
Claims
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IPC IPC(8): F21K99/00F21V29/00
CPCH01S5/02446H01S5/06216H01S5/0092H01S5/02296H01S3/109H01S5/141H01S5/005H01S5/02208G02F1/353G02F2203/60H01S5/02257
Inventor 堀川好广小樱隆之小泽哲也西久保亨鲛岛贵纪吉田和弘
Owner USHIO DENKI KK