Temperature-insensitive frequency conversion achieved by phase-matching outside principal planes and thermally induced phase-mismatch compensation

Xun Liu; Xueju Shen; Dongmei Diao; Long Wang; Geng Luo

doi:10.1117/1.OE.57.11.111806

21 November 2018 Temperature-insensitive frequency conversion achieved by phase-matching outside principal planes and thermally induced phase-mismatch compensation

Xun Liu, Xueju Shen, Dongmei Diao, Long Wang, Geng Luo

Author Affiliations +

Optical Engineering, Vol. 57, Issue 11, 111806 (November 2018). https://doi.org/10.1117/1.OE.57.11.111806

Abstract

To enhance the thermal stability and scale up the output power of frequency conversion, a temperature-insensitive frequency conversion method is proposed, which is achieved by phase-matching outside principal planes and thermally induced phase-mismatch compensation. In the method, there are three cascaded crystals. Two crystals at the ends are phase matched with propagation directions outside principal planes. The other crystal, with an opposite sign of first temperature derivative of phase mismatch, is sandwiched in the middle and used for compensating the thermally induced phase mismatch generated in the first crystal. In a proof-of-principle study, two KTiOPO₄ (KTP) crystals cut at (θ = 78.28 deg, φ = 40.99 deg) and a compensation crystal LiB₃O₅ (LBO) are employed for temperature-insensitive second harmonic generation of 1064 nm. As a result, the temperature bandwidth and maximum conversion efficiency, respectively, reach at 49.3°C and 56.8% with an interaction length of 14 mm. The proposed method is capable of increasing thermal stability for various frequency conversion processes across a broad spectral band.

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Xun Liu, Xueju Shen, Dongmei Diao, Long Wang, and Geng Luo "Temperature-insensitive frequency conversion achieved by phase-matching outside principal planes and thermally induced phase-mismatch compensation," Optical Engineering 57(11), 111806 (21 November 2018). https://doi.org/10.1117/1.OE.57.11.111806

Received: 2 April 2018; Accepted: 1 November 2018; Published: 21 November 2018

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KEYWORDS

Crystals

Ferroelectric materials

Frequency conversion

Phase matching

Second-harmonic generation

Temperature metrology

Nonlinear crystals

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