Group velocity mismatching online compensation triple frequency harmonic laser device and application thereof
A sub-harmonic and group-velocity technology, which is applied in the field of group-velocity mismatch online compensation for third-harmonic laser devices, can solve problems such as group velocity mismatch, and achieve the effects of improving output power and efficiency, simple operation, and improving conversion efficiency
Inactive Publication Date: 2015-03-25
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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[0004] According to one aspect of the present application, a third-harmonic pulse laser device with online compensation for group velocity mismatch is provided, which solves the problem of group velocity mismatch by performing online compensation for the group velocity mismatch of fundamental frequency light and frequency doubled light , which greatly improves the conversion efficiency of the third harmonic
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Embodiment 1
[0053] The fundamental frequency light source in this embodiment comes from a femtosecond Ti:Sapphire laser amplifier, the femtosecond pulse width is 120 fs, the repetition frequency is 1 kHz, and its wavelength tuning range is 770nm-830nm. Frequency doubling crystal 10 is BBSAG crystal (θ=29.2°, 5.5mm×5.5mm×1mm). The group velocity compensation crystal 20 is β-BBO (θ=65°, 5.5mm×5.5mm×3mm). The sum frequency crystal 30 is β-BBO (θ=55.9°, 5.5mm×5.5mm×0.5mm). The beam splitter is coated on both sides, the wavelength range of high reflection is 250nm~300nm, and the wavelength range of high transparency is 700nm~1000nm, 350nm~500nm.
[0054] After the fundamental frequency light generated by the Ti:Sapphire laser enters the frequency doubling crystal 10, it satisfies the first type of phase matching condition and generates a second harmonic (frequency doubling light). In the time domain, the multiplier light lags behind the fundamental frequency light, that is, the group v...
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Abstract
The invention discloses a group velocity mismatching online compensation triple frequency harmonic laser device which comprises a frequency doubling crystal, a group velocity compensation crystal and a sum frequency crystal. The group velocity compensation crystal is located between the frequency doubling crystal and the sum frequency crystal. After frequency doubled light generated after fundamental frequency light passes through the frequency doubling crystal and the fundamental frequency light pass through the group velocity compensation crystal together and then pass through the sum frequency crystal, sum frequency lasers are obtained. According to the group velocity mismatching online compensation triple frequency harmonic laser device, online compensation is carried out on the group velocity mismatching of the fundamental frequency light and the frequency doubled light, the problem of group velocity mismatching is solved, and the conversion efficiency of triple frequency harmonic is improved to a large extent. The device is easy to operate and low in cost, the complexity of light paths is reduced, and the device is especially suitable for a super-short-pulse laser.
Description
technical field [0001] The application relates to a third-harmonic laser device for on-line compensation of group velocity mismatch, which belongs to the field of lasers. Background technique [0002] Ultrashort ultraviolet pulse laser has broad application prospects in the fields of ultrafine processing, nanobiological engineering, secure communication, modern biotechnology, material processing, spectral analysis and scientific research. [0003] Nonlinear frequency conversion technology is the most common method to achieve ultrashort ultraviolet pulse laser output. However, for strong field ultrashort laser pulses, group velocity mismatch is one of the main factors affecting its frequency doubling efficiency. The so-called group velocity mismatch means that due to the different propagation speeds of light of different frequencies in the nonlinear crystal, the group velocity of the fundamental frequency wave and the group velocity of the second harmonic are inconsistent, ma...
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Login to View More IPC IPC(8): H01S3/109G02F1/37
Inventor 孟祥昊刘华刚黄见洪陈金明李锦辉林文雄
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI