JPH0545689A - Waveguide-type nonlinear optical device - Google Patents

Abstract

PURPOSE:To obtain a waveguide-type nonlinear optical device comprising high- efficient beta-Ba1-xSrxB2O4 by forming the waveguide by epitaxial growing of beta-Ba1-xSrxB2O4 (0<X<=0.03) on beta-BaB2O4. CONSTITUTION:beta-Ba1-xSrxB2O4 is obtd. by partly substituting Sr for the position of Ba in beta-BaB2O4 and it has higher refractive index than beta-BaB2O4. Thereby, by epitaxially growing beta-Ba1-xSrxB2O4 (0<X<=0.03) to form a thin film on a beta-BaB2O4 substrate, an optical waveguide can be formed owing to the difference of refractive indices of these. Thereby, a waveguide-type nonlinear optical device using beta-Ba1-xSrxB2O4 can be manufactured with which high energy density can be obtd. with small incident power.

Description

Detailed Description of the Invention

[0001]

This invention relates to β-Ba _{1 -x} Sr _x
The present invention relates to a waveguide type non-linear optical device using B ₂ O ₄ .

[0002]

_2. Description of the Related Art β-BaB ₂ O ₄ is an excellent harmonic generating material that has a relatively large nonlinear optical constant and is transparent up to the ultraviolet region, but it has been conventionally used only as a bulk single crystal. In this method of use, increasing the input power was the only means for increasing the energy density.

[0003]

In a nonlinear optical element using β-BaB ₂ O ₄ , an optical waveguide was required to increase the energy density without increasing the input power.

[0004]

Means for Solving the Problems On a β-BaB ₂ O ₄ substrate, β-Ba _{1 -x} Sr _x B ₂ O ₄ (where 0 <x ≦ 0.
03) is epitaxially grown to form a waveguide.

[0005]

The waveguide type nonlinear optical device of the present invention will be described in detail below.

Β-Ba _{1 -x} Sr _x B ₂ O ₄ (0 <x≤0..0) in which the Ba position of β-BaB ₂ O ₄ is partially substituted with Sr.
It was revealed for the first time by experiments by the present inventor that 03) has a higher refractive index than β-BaB ₂ O ₄ as shown in Table 1. Therefore, on the β-BaB ₂ O ₄ substrate, β-B
If a _1-x Sr _x B ₂ O ₄ (0 <x ≦ 0.03) is epitaxially grown to form a thin film, an optical waveguide can be formed by the difference in refractive index between the two.

[0007]

[Table 1]

Β-Ba _{1 -x} Sr _x B ₂ O ₄ is β-Ba
Like B ₂ O ₄ , it is transparent to the ultraviolet region and has non-linear optical properties. Therefore, by adopting a thin film waveguide structure, the propagation of light is controlled within a thin film, and even if the input power is small, the energy density can be easily adjusted. Can be higher. Therefore, it is possible to obtain a short-wavelength high-efficiency laser light which can use a small output light source. When x becomes 0.04, the ratio of α phase increases and the refractive index decreases. Therefore, the value of x is preferably up to 0.03.

[0009]

Example: ₁ mol of BaCl ₂ .2H ₂ O and H ₃ BO ₃
Were thawed and 2mol into 2 l of water and adjusted to pH 12 to precipitate the BaB ₂ O ₄ powder. 8 this powder
At 00 ° C. and calcined for 10 hours to obtain a β-BaB ₂ O _4. This powder was filled in a platinum crucible, and a β-BaB ₂ O ₄ single crystal was grown in a usual high-frequency pulling furnace. The pulling was performed at a seed rotation speed of 20 rpm, a pulling speed of 3 mm / h, an atmosphere in air, and a growing orientation was the c-axis. The grown crystal was cut into a c-plane and processed for a substrate.

[0010] _{β-Ba 0. 9 7 Sr} 0. 0 3 B 2 O 4 powder, BaCl of 0.97mol ₂ · 2H ₂ O and 0.0
3 mol SrCl ₂ .6H ₂ O and 2 mol H ₃ BO
Melt ₃ and 2 liters of water, adjust pH to 12,
It was prepared by calcining the precipitate at 800 ° C. for 10 hours.

[0011] _{β-Ba 0. 9 7 Sr} 0. 0 3 B 2 O 4 powder was used as a liquid phase epitaxial growth melt material, of the z plate beta
-BaB ₂ O ₄ as a substrate, β-BaB with a film thickness of 1 μm
_{A 2} O ₄ thin film was prepared.

The 1.064 μm light of the LD-pumped YAG laser incident from the end face of this thin film planar waveguide propagates in the waveguide, and due to the nonlinearity of β-BaB ₂ O ₄ ,
0.532 μm SHG light was obtained from the emission end face.

[0013]

As described above, a high energy density can be obtained with a small incident power. According to the present invention, β-Ba _{1 -x}
A waveguide type nonlinear optical device using Sr _x B ₂ O ₄ can be manufactured.

Claims (1)

[Claims] 1. A β-BaB ₂ O ₄ substrate on which β-Ba is formed.
_{1- x Sr x B 2 O 4} ( where, 0 <x ≦ 0.03) waveguide nonlinear optical device is characterized in that it forms the epitaxially grown waveguide.