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학술지 Spectrally combined four-diode-pumped femtosecond Ti:sapphire laser with 16.3 nJ pulse and its application to video-rate coherent anti-Stokes Raman scattering spectro-microscopy
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저자
송동훈, 허철, 서홍석
발행일
202301
출처
Optics Express, v.31 no.2, pp.3269-3277
ISSN
1094-4087
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/OE.481422
협약과제
23IR4100, 감염병 예방을 위한 스포츠 시설 이용 안전 기술 개발, 허철
초록
We demonstrate the generation of high-energy femtosecond pulses by a spectrally combined four-diode-pumped Ti:sapphire laser with semi-conductor saturable absorber mirror mode locking. To achieve energy scaling, the laser cavity was extended using a design based on the Herriott multipass cell. The laser operates at a 17.5 MHz repetition rate and generates pulses with energies as high as 16.3 nJ and 80 fs in duration. The signal-to-noise ratio at the fundamental frequency showed an extinction ratio of >50 dB relative to the carrier. This compact single laser was applied to video-rate forward and backward coherent anti-Stokes Raman scattering spectro-microscopy with a pixel dwell time of 122 ns, which is the lowest dwell time ever achieved, to the best of our knowledge.
KSP 제안 키워드
Coherent anti-stokes Raman scattering, Diode pumped, Dwell Time, Energy scaling, Forward and Backward, Fundamental Frequency, Laser cavity, Mode-locking, Multipass cell, Raman scattering(SERS), Repetition rate