Compact and tunable mid-infrared source based on a 2 μm dual-wavelength KTiOPO ₄ intracavity optical parametric oscillator

Abstract

Compact and tunable mid-infrared source based on a 2 µm dual-wavelength KTiOPO 4 intracavity optical parametric oscillator * Geng You-Fu(耿优福) a)c) , Tan Xiao-Ling(谭晓玲) b) , Li Xue-Jin(李学金) a) † , and Yao Jian-Quan(姚建铨) c)

High-repetition-rate, tunable and coherent mid-infrared source based on difference frequency generation from a dual-wavelength 2 µm laser and GaSe crystal

“…The linewidth of the dual-wavelength 2 µm laser was around 0.8 nm. The peak intensity for the dualwavelength 2 µm pump laser injected into the GaSe crystal was about 110 kW cm −2 , which is much lower than the 5.3 MW cm −2 and 4 MW cm −2 that were used in [5,9]. Using the high-repetition-rate laser pulse lowers the peak intensity requirements of the pump laser, and thus avoids increasing the pump intensity close to the damage threshold of the GaSe crystal.…”

“…Due to the large birefringence of the GaSe crystal, it can satisfy phase-matching (type-I and type-II) conditions for a variety of optical configurations within the nonlinear optical crystals [7]. Since 2010, our group has focused on DFG mid-infrared sources pumped by pulsed dual-wavelength 2 µm lasers [8,9]. The repetition rate of the pulse DFG systems is usually low (1-50 Hz) in order to achieve higher energy, the standard being 10 Hz.…”

Mid-IR dual-wavelength difference frequency generation in uniform grating PPLN using index dispersion control

“…Mid-IR laser sources in 3 µm-5 µm wavelength band are essential for many applications, such as optical measurement, remote sensing and spectrum analysis. [1][2][3] Among the existing commercially available mid-IR lasers, the difference frequency generation (DFG) laser source, based on the quasiphase matching (QPM) technique, is very attractive due to its superior features of narrow line width, wide and continuous wavelength tunability, and no need for extra liquid nitrogen cooling. [4][5][6] In the past few years, a lot of work has been focused on the multiwavelength mid-IR DFG laser radiations to satisfy the requirements for the detection of multiple species or multiple absorption lines synchronously.…”

Low noise, continuous-wave single-frequency 1.5-μm laser generated by a singly resonant optical parametric oscillator

“…[6,7] Compact and tunable all-solid-state mid-infrared laser can be obtained based on an optical parametric oscillator. [8,9] Moreover, CW singly resonant optical parametric oscillators (SROs) are the stable sources of tunable singlefrequency radiation. Samanta and Zadeh [10] generated more than 2 W of CW single-frequency idler with signal over 856-1404 nm using an SRO based on MgO:sPPLT pumped by an optical pumped semiconductor laser.…”