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High-efficiency frequency conversion in deep ultraviolet with a KBe(2)BO(3)F(2) prism-coupled device.

Guiling Wang¹, Xiaoyang Wang, Yong Zhou

¹Institute of Physics, Chinese Academy of Sciences, Beijing, China. wglamanda@hotmail.com

|January 22, 2008

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High-efficiency fourth-harmonic generation was achieved for femtosecond laser pulses at 200 nm using a novel KBe(2)BO(3)F(2) crystal. This breakthrough in nonlinear optics offers a new pathway for deep ultraviolet laser applications.

Area of Science:

Nonlinear Optics
Laser Physics
Materials Science

Background:

Femtosecond laser systems are crucial for various scientific applications.
Generating deep ultraviolet (DUV) light, such as 200 nm, efficiently remains a challenge.
Potassium beryllium borate fluoride (KBe(2)BO(3)F(2)) is a promising nonlinear optical crystal.

Purpose of the Study:

To investigate the feasibility of fourth-harmonic generation (FHG) using a KBe(2)BO(3)F(2) crystal.
To achieve high conversion efficiency for femtosecond laser pulses at 200 nm.
To explore the performance of a prism-coupled device for DUV generation.

Main Methods:

A 2.3 mm thick KBe(2)BO(3)F(2) crystal was optically contacted with CaF(2).
The crystal was integrated into a prism-coupled device.

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Fourth-harmonic generation was performed using a femtosecond (150 fs) Ti:sapphire laser system.

Main Results:

A high conversion efficiency of 26.1% was achieved for fourth-harmonic generation at 200 nm.
The maximum output power at 200 nm reached 10.7 mW.
The KBe(2)BO(3)F(2) crystal demonstrated excellent performance in generating DUV radiation.

Conclusions:

The study successfully demonstrated efficient fourth-harmonic generation at 200 nm using a KBe(2)BO(3)F(2) crystal.
The results highlight the potential of this material and configuration for DUV laser applications.
This work contributes to advancements in nonlinear optics and laser technology.