scholarly journals Development of a variable focal length concave mirror for on-shot thermal lens correction in rod amplifiers

2006 ◽  
Vol 14 (23) ◽  
pp. 10957 ◽  
Author(s):  
Jens Schwarz ◽  
Matthias Geissel ◽  
Patrick Rambo ◽  
John Porter ◽  
Daniel Headley ◽  
...  
Keyword(s):  
Thermal Lens ◽  
Focal Length ◽  
Concave Mirror

The interferometric measurement of thermal lens effect in a LD pumped Tm-doped bulk laser

2021 ◽  
Author(s):  
Yuantao Zhao ◽  
Shengzhi Zhao ◽  
Tao Li ◽  
Yizhou Liu ◽  
Chun Wang ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Thermal Lens ◽  
Precise Measurement ◽  
Laser Crystal ◽  
Focal Length ◽  
Mode Locking ◽  
Experimental Result ◽  
Interferometric Method ◽  
Thermal Lens Effect ◽  
Thermal Focal Length

Abstract Directly measuring thermal focal length is important for designing and optimizing the mode locking oscillator, especially for a 2-μm mode-locking laser. In this paper, we propose a novel interferometric method for measuring the thermal focal length in a 2-μm mode-locking laser. This method could give a precise measurement of the thermal focal length inside a long-folded oscillator in both lasing and non-lasing operation. We also theoretically calculate the thermal focal length based on the temperature distribution inside the laser crystal, which matches well with the experimental result

scholarly journals Thermal lens in a liquid sample with focal length controllable by bulk temperature

2016 ◽  
Vol 122 (5) ◽  
Author(s):  
Krzysztof Dobek ◽  
Mikołaj Baranowski ◽  
Jerzy Karolczak ◽  
Dariusz Komar ◽  
Kamila Kreczmer ◽  
...  
Keyword(s):  
Thermal Lens ◽  
Focal Length ◽  
Bulk Temperature ◽  
Liquid Sample

scholarly journals Phase shift of amplitude-modulated optical signals in graphene oxide water dispersions due to thermal lens focal length oscillation

2014 ◽  
Vol 31 (5) ◽  
pp. 1018 ◽  
Author(s):  
Sonia Melle ◽  
Oscar G. Calderón ◽  
Ana Egatz-Gómez ◽  
E. Cabrera-Granado ◽  
F. Carreño ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phase Shift ◽  
Thermal Lens ◽  
Focal Length ◽  
Optical Signals ◽  
Lens Focal Length

scholarly journals II. On a cassegrain reflector with corrected field

1914 ◽  
Vol 213 (497-508) ◽  
pp. 27-66 ◽  
Keyword(s):  
Spherical Aberration ◽  
Focal Length ◽  
Equal Treatment ◽  
Object Point ◽  
Concave Mirror ◽  
Subsequent Work ◽  
Image Area ◽  
Cassegrain Telescope ◽  
Geometrical Defects ◽  
Do So

The great advantage enjoyed by the reflecting telescope is its equal treatment of rays of all colours, and the geometrical defects or aberrations of its field are less than those of many of the older refractors. The most serious of these defects is coma, owing to which different zones of the objective do not place the light which they receive from the same object-point symmetrically around any common centre in the image area, but arrange it in a radial fan or flare, the light from the outer zones being most diffused; besides spoiling the image this tends to neutralize, for any except narrow fields, the value of extended aperture in the objective as a light-collector. In the refractor this can be and is now always met by adjusting the curves of the two lenses, for when achromatism, as far as possible, and spherical aberration are allowed for, there still remains one unused datum; in old forms this was often used to make the inner curves contact curves that might be cemented together if it was convenient to do so, but it is properly employed to extinguish coma. But with the reflector the case is different. In the Newtonian form there is only one available surface, and when this is made a paraboloid to cure spherical aberration, nothing is left to adjust. In the Gregorian or Cassegrain forms there are two curved surfaces and, theoretically, these would offer means to correct two faults. An illuminating study of the possibilities of a system of two mirrors has been made by Schwarzschild in his ‘Untersuchungen zur Geometrischen O ptik’; I shall deal with its outcome below. Its general tenor is comprehensive and exploratory rather than detailed, and it remains doubtful whether any of the forms which he indicates for the reflector, at the point at which his research stops, could actually be made successfully upon a scale that would show their advantages. My own purpose in the present paper is essentially a practical one. I have in mind throughout a telescope of large aperture and considerable focal length, and seek to devise a correction for the faults of its field which shall leave its achromatism unimpaired, which can really be made and which shall effect its purpose without employing any curves and angles outside those that are already known to work well. It has been said that “an object-glass cannot be made on paper,’’ but the possibilities of new and somewhat complicated constructions must in all cases first be demonstrated on paper, since practice can never conveniently vary more than a single factor at a time. Study is directed to the Cassegrain because of the great advantage which this design possesses in shortening the tube of the instrument for given focal length, and in placing the observer at the lower, in place of at the upper, end of it. The best introduction to the subsequent work will be in the form of a few remarks upon Schwarzschild’s results. These are not meant as a complete criticism or estimation of it but are merely such as arise naturally in relation to the points with which I deal afterwards. The traditional form of Cassegrain telescope consists of a great concave mirror faced by a small convex one, which is placed between the great mirror and its principal focus, and throws the image out through a hole cut centrally in the great mirror. The small mirror increases the effective focal length in the ratio of its distances respectively from the final principal focus and from the principal focus of the great mirror.

A Method for Measuring Thermal Lens Focal Length of End-Pumped Nd:GdVO4Crystals

2009 ◽  
Vol 36 (11) ◽  
pp. 3031-3034
Author(s):  
项震 Xiang Zhen ◽  
付鑫 Fu Xin ◽  
葛剑虹 Ge Jianhong
Keyword(s):  
Thermal Lens ◽  
Focal Length ◽  
Lens Focal Length

Thermal lens with passively tuned focal length formed in a photochromic material

2020 ◽  
Vol 59 (22) ◽  
pp. 6682
Author(s):  
Krzysztof Dobek ◽  
Sabina Brazevic
Keyword(s):  
Thermal Lens ◽  
Focal Length ◽  
Photochromic Material

More precise determination of thermal lens focal length for end-pumped solid-state lasers

2006 ◽  
Vol 266 (2) ◽  
pp. 620-626 ◽  
Author(s):  
Shuzhen Fan ◽  
Xingyu Zhang ◽  
Qingpu Wang ◽  
Shutao Li ◽  
Shuanghong Ding ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Lens ◽  
Focal Length ◽  
Precise Determination ◽  
Solid State Lasers ◽  
Lens Focal Length
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